Hire Me - Revision history

Leo at 06:39, 6 December 2025

2025-12-06T06:39:26Z

← Older revision		Revision as of 06:39, 6 December 2025
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	* '''Container Platforms''': Docker, Kubernetes, Apptainer		* '''Container Platforms''': Docker, Kubernetes, Apptainer
	* '''Cloud & Virtualization''': AWS, OCI, VMware vSphere/Automation, Proxmox, CloudStack		* '''Cloud & Virtualization''': AWS, OCI, VMware vSphere/Automation, Proxmox, CloudStack
	* '''Programming & Scripting''': Bash, PowerShell, Python, Java, C#, PHP, C~~/C++~~		* '''Programming & Scripting''': Bash, PowerShell, Python, Java, C#, PHP, C
	* '''Databases''': MySQL, MariaDB, PostgreSQL, SQLite, InfluxDB / Flux		* '''Databases''': MySQL, MariaDB, PostgreSQL, SQLite, InfluxDB / Flux, ElasticSearch
	* '''Monitoring''': Grafana, InfluxDB, Telegraf, ELK stack		* '''Monitoring''': Grafana, InfluxDB, Telegraf, ELK stack
	* '''Networking''': HP and Cisco switches, software firewalls, NAS systems		* '''Networking''': HP and Cisco switches, software firewalls, NAS systems

Leo at 06:37, 6 December 2025

2025-12-06T06:37:28Z

Leo at 05:42, 6 December 2025

2025-12-06T05:42:37Z

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	* '''Security''': Kerberos, LDAP, PAM, PKI, log‑based threat hunting, network packet analysis		* '''Security''': Kerberos, LDAP, PAM, PKI, log‑based threat hunting, network packet analysis
	* '''Hardware Platforms''': x86_64, ARM64, Sun, Dell, HP, IBM Tape Library (TS4500)		* '''Hardware Platforms''': x86_64, ARM64, Sun, Dell, HP, IBM Tape Library (TS4500)

	~~=== Education & Training ===~~
	* Bachelor of Science in Computer Science, University of Calgary
	** August 2007 - May 2011
	** Notable courses: CPSC 550; System Administration with Darcy Grant, Wayne Pearson (2010 – 2011)
	* Red Hat Satellite 6 Training
	** Completed August 2018
	* VMware vSphere 6.7
	** Completed January 2019
	* VMware vRealize Automation 6.5
	** Completed January 2019

	== Professional experience ==		== Professional experience ==
	=== HPC System Administrator - University of Calgary (December 2019 - ~~Deecmber~~ 2025) ===		=== HPC System Administrator - University of Calgary (December 2019 - Decmber 2025) ===
	One of three lead architect and operators for the HPC resources at Research Computing Services (RCS). Tasked with the successful transition of the 1PB+ storage system at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine (CSM) into RCS's service offering. Streamlined over 1000 HPC cluster nodes to Ansible, automated account vending, and implemented a robust metrics collection and reporting system.		One of three lead architect and operators for the HPC resources at Research Computing Services (RCS). Tasked with the successful transition of the 1PB+ storage system at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine (CSM) into RCS's service offering. Streamlined over 1000 HPC cluster nodes to Ansible, automated account vending, and implemented a robust metrics collection and reporting system.

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	* Authored support documentation and end-user guides with a focus on undergraduate student experience		* Authored support documentation and end-user guides with a focus on undergraduate student experience

	=== C# Developer - Onstream Pipeline Inspection Ltd. ===		=== C# Developer - Onstream Pipeline Inspection Ltd. (2011 - 2012) ===
	~~May 2011 – September 2013, Full Time, http://onstream-pipeline.com/~~

	I was one of two C# developers at a pipeline inspection company, developing their new version of pipeline analysis software.		I was one of two C# developers at a pipeline inspection company, developing their new version of pipeline analysis software.
	* Debugged existing in-house software written in Borland C++ on the Windows platform		* Debugged existing in-house software written in Borland C++ on the Windows platform
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	* Developed the next version of their analysis software from scratch using C# .NET4		* Developed the next version of their analysis software from scratch using C# .NET4

	=== Freelance Web Developer & Designer – Steamr ===		=== Freelance Web Developer & Designer – Steamr (2005 - 2015) ===
	~~June 2005 – 2014, Freelance, http://steamr.com/~~		I was a freelance web designer and developer for over 20 clients across North America with custom web designs and applications. I was responsible for ensuring projects are completed on-time, on-budget and satisfies client requirements.
			* Consulted with clients on requirements, budget, and timelines. Delivered frequent deliverables and project updates to ensure transparency
	I am a freelance web designer and developer ~~and provided~~ clients ~~primarily in~~ North America with custom web designs and applications. I am responsible for ensuring projects are completed on-time, on-budget and satisfies client requirements.		* Created and deployed custom web designs from scratch using Adobe Photoshop, Illustrator, Notepad++ while ensuring full compatibility across half a dozen web browsers
			=== Server Administrator - SwiftHost.net (2004 - 2012) ===
	~~A sample of my work can be found on my portfolio at: http://steamr.com/portfolio~~		Operated a web hosting company with a partner with a focus on affordable shared and reseller hosting. Servers utilized were based on the LAMP stack along with the use of the cPanel control panel.

	~~Responsibilities:~~
	* Consulted with clients ~~for every project for~~ budget, ~~timeline~~ and ~~user requirements and delivered~~ frequent deliverables and project updates.
	* Created and deployed custom web designs from scratch using Adobe Photoshop, Illustrator, Notepad++~~, and~~ half a dozen web browsers.
	* Ensured all websites were optimal, standards compliant, cross-browser compatible, and search engine optimized (SEO) based on web analytics.
	* Created and maintained over 20 projects under the LAMP stack, along with using PHP frameworks and libraries including: Kohana, CodeIgniter, FPDF, Smarty.
	* Created over 40 individual websites from scratch for businesses and individuals.
	* Customized design themes for WHMCS, SolusVM, Kayako Support Suite for hosting companies.

	~~Related Work:~~
	* Previous webmaster for GlobalTech Communications including: nworks.ca, gtcomm.net, unmeteredserver.net, zenprotection.com
	* Responsible for updating content and promotions while ensuring website correctly interfaces with the point of sale application.
	* Developed an internal network management application for gtcomm.net in PHP utilizing MRTG. Abnormal network patterns will notify an administrator via email and SMS.
	* Created a distributed network monitoring system based on Java, PHP and MySQL, which utilizes http and ping tests to determine the availability and latency of remote services. Results are then recorded and monthly reports generated.
	* Designed the front-end of an in-house inventory system used by gtcomm.net used to track networking/server hardware along with managing available IP pools.
	* Designed the front-end of an in-house project enabling end users to purchase and manage DDoS protection services by zenprotection.net.

	=== Server Administrator - SwiftHost.net ===
	~~January 2004 – May 2012, http://swifthost.net/~~

	~~With a partner, I created~~ a web hosting company~~, focusing~~ on affordable shared and reseller hosting. Servers utilized were based on the LAMP stack along with the use of the cPanel control panel.

	~~Responsibilities:~~
	* Managed production servers hosting over 400 individual websites		* Managed production servers hosting over 400 individual websites
	* Responsible for responding to ~~many~~ customer support tickets ~~within 6 hours for issues under the~~ technical~~, abuse and billing department.~~		* Responsible for responding to customer support tickets and provided technical support for a wide range of web applications
	* Technical issues handled by me ranged from fixing simple permission issues to handling requests for ~~specific software such as Apache/PHP modules, system libraries, and Caching / PHP Accelerators~~		* Performed security audits and server hardening, firewall and intrusion detection in a shared hosting environment
	* Performed security audits and server hardening ~~by disabling or restricting services~~, ~~configuring the~~ firewall~~, detecting compromised websites~~ and ~~spam control~~ in a shared hosting environment.		=== AS/400 Night Operator - Calgary Programming Factory (2007) ===
	* Configured weekly, network-based backups to an off-site location using cronjobs, rsync and shell scripts. Performed account or file specific restores from backups.		I worked as night operator as part of the AS/400 support team at the Calgary Programming Factory for The Sovereign General Insurance Company as a summer job.

	~~Projects:~~
	* Designed a custom billing solution for account management using PHP, MySQL and the PayPal API.
	* A status page which monitored and reported live server status information such as processor load, traffic load, service availability, memory usage to customers.
	* Developed a custom web control panel, similar to cPanel, targeted to free hosting accounts. The control panel based on PHP, MySQL, Shell + Perl Scripts, enabled end users to manage their websites, domains and databases while automatically maintaining and enforcing disk and bandwidth quotas.

	=== AS/400 Night Operator - Calgary Programming Factory ===
	~~May 2007 – July 2007, Part Time~~

	I worked as night operator as part of the AS/400 support team at the Calgary Programming Factory for The Sovereign General Insurance Company as a summer job.

	~~Responsibilities:~~
	* Operated the tape backup system, ensuring backups are valid and without errors.		* Operated the tape backup system, ensuring backups are valid and without errors.
	* Operated the AS/400 system to print system logs and claim checks		* Operated the AS/400 system to print system logs and claim checks
	* Ensured paper was loaded and aligned properly to the printers before printing		* Ensured paper was loaded and aligned properly to the printers before printing
	* Researched feasibility to migrate their existing projects based on JSP servlets to ASP.NET		* Researched feasibility to migrate their existing projects based on JSP servlets to ASP.NET

			== Education & Training ==
			* Bachelor of Science in Computer Science, University of Calgary, 2011
			** Notable courses: CPSC 550; System Administration with Darcy Grant, Wayne Pearson (2010 – 2011)
			* Red Hat Satellite 6 Training
			* VMware vSphere 6.7
			* VMware vRealize Automation 6.5

	== Personal ==		== Personal ==
	* ~~Canadian; Speaks~~ English & Cantonese		* Languages: English, Cantonese
	* ~~Interest in anything Linux related, System Infrastructure~~, ~~Systems Security~~, ~~Game Development~~, ~~Electronics~~ & ~~Tinkering~~		* Interests: system infrastructure, systems security, game development, electronics & hardware tinkering

Leo: Simplify professional experience

2025-12-06T01:50:31Z

Simplify professional experience

Show changes

Leo: /* Relevant Skills */

2025-12-05T07:17:05Z

Relevant Skills

← Older revision		Revision as of 07:17, 5 December 2025
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	=== OPERATING SYSTEMS ===		=== OPERATING SYSTEMS ===
	* {{#expr: floor( {{CURRENTYEAR}} - 2006) }}+ years of server experience with Linux (Primarily Red Hat-based, CentOS, Rocky Linux, Fedora)		* {{#expr: floor( {{CURRENTYEAR}} - 2006) }}+ years of server experience with Linux (Primarily Red Hat-based, Eg. CentOS, Rocky Linux, Fedora)
	* {{#expr: floor( {{CURRENTYEAR}} - 2005) }}+ years of desktop support experience with Windows		* {{#expr: floor( {{CURRENTYEAR}} - 2005) }}+ years of desktop support experience with Windows
	* Experience with Solaris and FreeBSD		* Experience with Solaris and FreeBSD

	=== NETWORKING ===		=== NETWORKING ===
	* Understandings key concepts of network protocols (TCP/IP, IP Routing, VLAN, etc.)		* Familiar with physical network maintenance, software firewalls, NAS appliances
	* Familiar with physical network maintenance, software firewalls ~~(IPTables)~~, NAS appliances
	* Experience with HP and Cisco switches		* Experience with HP and Cisco switches

	=== ~~SERVICES AND~~ SOFTWARE ===		=== SOFTWARE ===
	* Containers: Docker~~, Docker Swarm~~, Kubernetes, ~~Singularity~~		* Containers: Docker, Kubernetes, Apptainer
	* Configuration ~~Tools~~: Ansible, SaltStack, Puppet, Terraform, Packer		* Configuration Management: Ansible, SaltStack, Puppet, Terraform, Packer
	* ~~Services~~: ~~HTTP/HTTPS (Apache 2, nodejs)~~, ~~SMTP (Sendmail~~, ~~Exim)~~, ~~POP~~/~~IMAP~~ (~~Dovecot)~~, ~~DNS (Bind), DHCP, NFS, NTP, FTP, PXE~~/~~TFTP~~, ~~Samba, Active Directory/LDAP~~		* Logs and metrics: Telegraf, InfluxDB, Grafana, EFK/ELK (ElasticSearch, Logstash/Fluentd, Kibana)
	* Products: ~~Spectrum Archive, Spectrum Protect (TSM), VMware vSphere, TheForeman /~~ Red Hat Satellite, GitLab, ~~EFK/ELK (ElasticSearch~~, ~~Logstash/Fluentd, Kibana), CloudStack~~		* Products: Red Hat Satellite, GitLab, CloudStack, Proxmox

	=== SECURITY ===		=== SECURITY ===
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	* {{#expr: floor( {{CURRENTYEAR}} - 2008) }}+ years configuring and web deploying applications		* {{#expr: floor( {{CURRENTYEAR}} - 2008) }}+ years configuring and web deploying applications
	* Containerize web applications for Kubernetes		* Containerize web applications for Kubernetes
	* Customize templates for MediaWiki, WordPress, Drupal~~, WHMCS, Kayako Support Suite~~		* Customize templates for MediaWiki, WordPress, Drupal
	* Experience with installing and administering cPanel/WHM, Plesk, DirectAdmin, SolusVM, HyperVM, Webmin
	*Experience with Amazon Web Services (AWS), Oracle Cloud Infrastructure (OCI)		*Experience with Amazon Web Services (AWS), Oracle Cloud Infrastructure (OCI)

	=== PROGRAMMING ===		=== PROGRAMMING ===
	* Coding: Java, C#, PHP, Python~~, HTML + CSS, Javascript (AngularJS, jQuery, nodejs), C~~, C++		* Scripting: bash/sh/awk, Powershell
	* Scripting: bash/sh/sed/awk, Perl, Powershell		* Coding: Java, C#, PHP, Python, C
	* Database: MySQL/MariaDB, SQLite, PostgreSQL, InfluxDB/flux		* Database: MySQL/MariaDB, SQLite, PostgreSQL, InfluxDB/flux
	* Debug: C, C++, gdb, strace, Ghidra		* Debug: C, C++, gdb, strace, Ghidra
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	Major accomplishments include:		Major accomplishments include:
	* Transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. ~~This help speed up deployments and day-to-day tasks such as user creation and~~ node deployment.		* Transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. Explored using Warewulf for node deployment.
	* Automated HPC cluster usage report generation from various sources for senior leadership and decision making		* Automated HPC cluster usage report generation from various sources (Eg. sensors, servers, network gear) for senior leadership and institutional decision making
			* Developed customized solutions for log parsing and processing for reports and alerts
	* Implemented and maintained Open OnDemand and custom containerized apps as a friendlier interface to RCS's HPC resources		* Implemented and maintained Open OnDemand and custom containerized apps as a friendlier interface to RCS's HPC resources
	* Implemented and maintained CloudStack as a private cloud solution; written training material and provided training sessions for users		* Implemented and maintained CloudStack as a private cloud solution; written training material and provided training sessions for users
	* Facilitated researchers into RCS managed AWS Control Tower environment while ensuring instutional security compliance and governance		* Facilitated researchers into RCS managed AWS Control Tower environment while ensuring instutional security compliance and governance

	My duties included:		My day to day duties included:
	* Operated, maintained, and troubleshooted HPC clusters running Slurm		* Operated, maintained, and troubleshooted HPC clusters running Slurm
	* Collected cluster metrics and hardware performance data which are stored into InfluxDB and visualized with Grafana		* Collected cluster metrics and hardware performance data which are stored into InfluxDB and visualized with Grafana
	* Provided researcher support for HPC, Open OnDemand, storage, CloudStack requests and issues		* Provided researcher and lab support for HPC, Open OnDemand, storage, CloudStack requests and issues
	* Gathered researcher requirements and ensure deployed services met their operational needs		* Gathered researcher requirements and ensure deployed services met their operational needs
	* Automate and streamline operational processes with custom scripts and CI/CD pipelines		* Automate and streamline operational processes with custom scripts and CI/CD pipelines

Leo at 07:01, 5 December 2025

2025-12-05T07:01:01Z

← Older revision		Revision as of 07:01, 5 December 2025
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	== Work History ==		== Work History ==
	=== System Administrator~~, Software Engineer~~ - University of Calgary ===		=== HPC System Administrator - University of Calgary ===
	December 2019 - ~~Current~~, Full Time, http://ucalgary.ca/hpc		December 2019 - December 2025, Full Time, http://ucalgary.ca/hpc

	I ~~am currently maintaining~~ and ~~transitioning the~~ infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS).		I maintained and transitioned infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine (CSM) to the centralized IT infrastructure, operated by Research Computing Services (RCS).

	~~Between 2020 and 2022, I have~~:		Major accomplishments include:
	* Transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. This help speed up deployments and day-to-day tasks such as user creation and node deployment.		* Transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. This help speed up deployments and day-to-day tasks such as user creation and node deployment.
	* ~~Introduced~~ Open OnDemand as a friendlier ~~alternative~~ to ~~our~~ HPC resources		* Automated HPC cluster usage report generation from various sources for senior leadership and decision making
	* ~~Gathered~~ and ~~generated reports on cluster-wide usage for senior leadership~~		* Implemented and maintained Open OnDemand and custom containerized apps as a friendlier interface to RCS's HPC resources
	* Implemented a in-house CloudStack ~~instance~~ as a private cloud solution; written training material and provided training sessions for users		* Implemented and maintained CloudStack as a private cloud solution; written training material and provided training sessions for users
			* Facilitated researchers into RCS managed AWS Control Tower environment while ensuring instutional security compliance and governance

	My duties ~~include~~:		My duties included:
	* ~~Managing~~ HPC clusters running Slurm ~~and LSF~~		* Operated, maintained, and troubleshooted HPC clusters running Slurm
	* ~~Collect and visualize~~ cluster metrics and performance data ~~primarily using~~ InfluxDB and Grafana		* Collected cluster metrics and hardware performance data which are stored into InfluxDB and visualized with Grafana
	* ~~Maintaining~~, ~~support~~, and ~~explore alternative containerized solutions for research with Singularity and Enroot containers~~		* Provided researcher support for HPC, Open OnDemand, storage, CloudStack requests and issues
	* Operating the IBM TS4500 tape library		* Gathered researcher requirements and ensure deployed services met their operational needs
	* ~~IBM Spectrum Archive~~ and ~~Spectrum Protect~~		* Automate and streamline operational processes with custom scripts and CI/CD pipelines
	* ~~Plan~~ and ~~transition users~~ and ~~workflows to the centralized offerings by RCS.~~		* Supported RCS's internal development team by providing guidance related to systems programming and development
	* ~~Provide research oriented support for researchers~~ and ~~students~~

	=== Infrastructure Automation & Containers Specialist - University of Calgary ===		=== Infrastructure Automation & Containers Specialist - University of Calgary ===
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	Due to the early stage of both infrastructure automation and Kubernetes as a Service projects, my tasks revolved around requirements gathering, solution testing, ensuring compatibility with the University's existing infrastructure, and adhering to all change and release processes.		Due to the early stage of both infrastructure automation and Kubernetes as a Service projects, my tasks revolved around requirements gathering, solution testing, ensuring compatibility with the University's existing infrastructure, and adhering to all change and release processes.

	~~Over the last year, achievements~~ include:		Achievements include:
	* Ensured the smooth operating of around 8 CoreOS Tectonic Kubernetes clusters		* Ensured the smooth operating of around 8 CoreOS Tectonic Kubernetes clusters
	* Evaluated Pivotal Enterprise PKS and Red Hat OpenShift as a new managed Kubernetes solution		* Evaluated Pivotal Enterprise PKS and Red Hat OpenShift as a new managed Kubernetes solution

Leo at 01:13, 12 October 2022

2022-10-12T01:13:57Z

← Older revision		Revision as of 01:13, 12 October 2022
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	== Objective ==		== Objective ==
	~~To fully apply~~ my skillset ~~and provide the best possible~~ technical ~~support~~ to ~~colleagues while challenging myself~~ with ~~new concepts~~ and ~~methodologies to further my journey in~~ IT.		With my wide skillset in different technical areas, my goal is to come up with elegant and streamlined solutions that meet both user and IT business operation requirements.

	== Relevant Skills ==		== Relevant Skills ==

	=== OPERATING SYSTEMS ===		=== OPERATING SYSTEMS ===
	* {{#expr: floor( {{CURRENTYEAR}} - 2006) }}+ years of server experience with Linux (Primarily Red Hat-based, CentOS, Fedora)		* {{#expr: floor( {{CURRENTYEAR}} - 2006) }}+ years of server experience with Linux (Primarily Red Hat-based, CentOS, Rocky Linux, Fedora)
	* {{#expr: floor( {{CURRENTYEAR}} - 2005) }}+ years of desktop support experience with Windows		* {{#expr: floor( {{CURRENTYEAR}} - 2005) }}+ years of desktop support experience with Windows
	* Experience with Solaris and FreeBSD		* Experience with Solaris and FreeBSD
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	=== SERVICES AND SOFTWARE ===		=== SERVICES AND SOFTWARE ===
	* Containers: Docker, Docker Swarm, ~~Buildah~~, ~~Kubernetes~~		* Containers: Docker, Docker Swarm, Kubernetes, Singularity
	* Configuration Tools: Ansible, SaltStack, Puppet		* Configuration Tools: Ansible, SaltStack, Puppet, Terraform, Packer
	* Services: HTTP/HTTPS (Apache 2, nodejs), SMTP (Sendmail, Exim), POP/IMAP (Dovecot), DNS (Bind), DHCP, NFS, NTP, FTP, PXE/TFTP, Samba, Active Directory/LDAP		* Services: HTTP/HTTPS (Apache 2, nodejs), SMTP (Sendmail, Exim), POP/IMAP (Dovecot), DNS (Bind), DHCP, NFS, NTP, FTP, PXE/TFTP, Samba, Active Directory/LDAP
	* Products: Spectrum Archive, Spectrum Protect (TSM), VMware vSphere, TheForeman, Red Hat Satellite 6, GitLab, EFK/ELK (ElasticSearch, Logstash/Fluentd, Kibana)		* Products: Spectrum Archive, Spectrum Protect (TSM), VMware vSphere, TheForeman / Red Hat Satellite, GitLab, EFK/ELK (ElasticSearch, Logstash/Fluentd, Kibana), CloudStack

	=== SECURITY ===		=== SECURITY ===
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	* Customize templates for MediaWiki, WordPress, Drupal, WHMCS, Kayako Support Suite		* Customize templates for MediaWiki, WordPress, Drupal, WHMCS, Kayako Support Suite
	* Experience with installing and administering cPanel/WHM, Plesk, DirectAdmin, SolusVM, HyperVM, Webmin		* Experience with installing and administering cPanel/WHM, Plesk, DirectAdmin, SolusVM, HyperVM, Webmin
			*Experience with Amazon Web Services (AWS), Oracle Cloud Infrastructure (OCI)

	=== PROGRAMMING ===		=== PROGRAMMING ===
	* Coding: Java, C#, PHP, Python, HTML + CSS, Javascript (AngularJS, jQuery, nodejs), C, C++		* Coding: Java, C#, PHP, Python, HTML + CSS, Javascript (AngularJS, jQuery, nodejs), C, C++
	* Scripting: bash/sh/sed/awk, Perl, Powershell		* Scripting: bash/sh/sed/awk, Perl, Powershell
	* Database: MySQL/MariaDB, SQLite, PostgreSQL		* Database: MySQL/MariaDB, SQLite, PostgreSQL, InfluxDB/flux
	* Debug: C, C++, gdb, strace		* Debug: C, C++, gdb, strace, Ghidra

	=== HARDWARE ===		=== HARDWARE ===
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	I am currently maintaining and transitioning the infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS).		I am currently maintaining and transitioning the infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS).

	Between 2020 and ~~2021~~, I have:		Between 2020 and 2022, I have:
	* ~~transitioned~~ our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. This help speed up deployments and day-to-day tasks such as user creation.		* Transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. This help speed up deployments and day-to-day tasks such as user creation and node deployment.
	* ~~introduced~~ Open OnDemand as a friendlier alternative to ~~using~~ our HPC resources		* Introduced Open OnDemand as a friendlier alternative to our HPC resources
	* ~~gathered~~ and generated reports on cluster-wide usage for senior leadership		* Gathered and generated reports on cluster-wide usage for senior leadership
	* ~~implemented~~ a ~~small~~ in-house CloudStack private cloud solution for ~~researcher with specific hardware/software requirements~~		* Implemented a in-house CloudStack instance as a private cloud solution; written training material and provided training sessions for users

	My duties include:		My duties include:
	* Managing HPC clusters running Slurm and LSF		* Managing HPC clusters running Slurm and LSF
	* Collect and visualize metrics and performance ~~information~~		* Collect and visualize cluster metrics and performance data primarily using InfluxDB and Grafana
	* Maintaining, support, and explore alternative containerized solutions for research		* Maintaining, support, and explore alternative containerized solutions for research with Singularity and Enroot containers
	* Operating the IBM TS4500 tape library		* Operating the IBM TS4500 tape library
	* IBM Spectrum Archive and Spectrum Protect		* IBM Spectrum Archive and Spectrum Protect

Leo: Updated for 2021

2021-12-30T02:45:12Z

Updated for 2021

← Older revision		Revision as of 02:45, 30 December 2021
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	=== SERVICES AND SOFTWARE ===		=== SERVICES AND SOFTWARE ===
	* Containers: Docker, Docker Swarm, Buildah, Kubernetes		* Containers: Docker, Docker Swarm, Buildah, Kubernetes
	* Configuration Tools: SaltStack, Puppet~~, CFEngine~~		* Configuration Tools: Ansible, SaltStack, Puppet
	* Services: HTTP/HTTPS (Apache 2, nodejs), SMTP (Sendmail, Exim), POP/IMAP (Dovecot), DNS (Bind), DHCP, NFS, NTP, FTP, PXE/TFTP, Samba, Active Directory/LDAP		* Services: HTTP/HTTPS (Apache 2, nodejs), SMTP (Sendmail, Exim), POP/IMAP (Dovecot), DNS (Bind), DHCP, NFS, NTP, FTP, PXE/TFTP, Samba, Active Directory/LDAP
	* Products: Spectrum Archive, Spectrum Protect (TSM), VMware vSphere, TheForeman, Red Hat Satellite 6, GitLab, EFK/ELK (ElasticSearch, Logstash/Fluentd, Kibana)		* Products: Spectrum Archive, Spectrum Protect (TSM), VMware vSphere, TheForeman, Red Hat Satellite 6, GitLab, EFK/ELK (ElasticSearch, Logstash/Fluentd, Kibana)
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	December 2019 - Current, Full Time, http://ucalgary.ca/hpc		December 2019 - Current, Full Time, http://ucalgary.ca/hpc

	I am currently maintaining and transitioning the infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS). My duties include:		I am currently maintaining and transitioning the infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS).
	* Managing HPC clusters running ~~SLURM~~ and LSF
			Between 2020 and 2021, I have:
			* transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments. This help speed up deployments and day-to-day tasks such as user creation.
			* introduced Open OnDemand as a friendlier alternative to using our HPC resources
			* gathered and generated reports on cluster-wide usage for senior leadership
			* implemented a small in-house CloudStack private cloud solution for researcher with specific hardware/software requirements

			My duties include:
			* Managing HPC clusters running Slurm and LSF
			* Collect and visualize metrics and performance information
			* Maintaining, support, and explore alternative containerized solutions for research
	* Operating the IBM TS4500 tape library		* Operating the IBM TS4500 tape library
	* IBM Spectrum Archive and Spectrum Protect		* IBM Spectrum Archive and Spectrum Protect

Leo: /* Work History */

2020-05-03T20:28:01Z

Work History

← Older revision		Revision as of 20:28, 3 May 2020
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	== Work History ==		== Work History ==
	=== System Administrator, Software Engineer - University of Calgary ===		=== System Administrator, Software Engineer - University of Calgary ===
	December 2019 - Current, http://ucalgary.ca/hpc		December 2019 - Current, Full Time, http://ucalgary.ca/hpc

	I am currently maintaining and transitioning the infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS). My duties include:		I am currently maintaining and transitioning the infrastructure operated at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine to the centralized IT infrastructure operated by Research Computing Services (RCS). My duties include:
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	=== Infrastructure Automation & Containers Specialist - University of Calgary ===		=== Infrastructure Automation & Containers Specialist - University of Calgary ===
	December 2018 - December 2019, http://ucalgary.ca/it		December 2018 - December 2019, Full Time Limited Term, http://ucalgary.ca/it

	I was part of a newly created team of two tasked with creating a new infrastructure automation system using VMware vRealize Automation as well as creating a managed on-site Kubernetes as a service solution for the University of Calgary.		I was part of a newly created team of two tasked with creating a new infrastructure automation system using VMware vRealize Automation as well as creating a managed on-site Kubernetes as a service solution for the University of Calgary.
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	=== Technical Systems Analyst for Linux Desktop - University of Calgary ===		=== Technical Systems Analyst for Linux Desktop - University of Calgary ===
	July 2018 - November 2018, http://ucalgary.ca/it		July 2018 - November 2018, Full Time, http://ucalgary.ca/it

	I was a Linux systems analyst under the Customer Technology Standards group tasked with designing and building a standardized Linux desktop environment for the University of Calgary. This position required transitioning and unifying the disparate Linux desktop infrastructures across various departments into a single standardized solution managed by central IT.		I was a Linux systems analyst under the Customer Technology Standards group tasked with designing and building a standardized Linux desktop environment for the University of Calgary. This position required transitioning and unifying the disparate Linux desktop infrastructures across various departments into a single standardized solution managed by central IT.

Leo: /* System Administrator and Programmer - University of Calgary */

2020-05-03T20:27:05Z

System Administrator and Programmer - University of Calgary

← Older revision		Revision as of 20:27, 3 May 2020
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	== Work History ==		== Work History ==
	=== System Administrator ~~and Programmer~~ - University of Calgary ===		=== System Administrator, Software Engineer - University of Calgary ===
	December 2019 - Current, http://ucalgary.ca/hpc		December 2019 - Current, http://ucalgary.ca/hpc

← Older revision		Revision as of 06:37, 6 December 2025
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	== Core competencies ==		== Core competencies ==
	* '''Operating systems''': {{#expr: floor( {{CURRENTYEAR}} - 2006) }}+ years of server experience with Red Hat-based OSes (CentOS, Rocky Linux, Fedora), Debian, Ubuntu. ~~Past experience~~ with Solaris and FreeBSD		* '''Operating systems''': {{#expr: floor( {{CURRENTYEAR}} - 2006) }}+ years of server experience with Red Hat-based OSes (CentOS, Rocky Linux, Fedora), Debian, Ubuntu. Experience with Solaris and FreeBSD
	* '''Automation & configuration''': Ansible, Terraform, Packer, SaltStack, Puppet, GitLab CI/CD		* '''Automation & configuration''': Ansible, Terraform, Packer, SaltStack, Puppet, GitLab CI/CD
	* '''Container Platforms''': Docker, Kubernetes, Apptainer		* '''Container Platforms''': Docker, Kubernetes, Apptainer
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	== Professional experience ==		== Professional experience ==
	=== HPC System Administrator - University of Calgary (December 2019 - ~~Decmber 2025~~) ===		=== HPC System Administrator - University of Calgary (December 2019 - Present) ===
	One of three lead ~~architect and operators for the~~ HPC resources at Research Computing Services (RCS). Tasked with the successful transition of the 1PB+ storage system at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine (CSM) into RCS's service offering. Streamlined over 1000 HPC cluster nodes to Ansible, automated account vending, and implemented a robust metrics collection and reporting system.		One of three lead administrators of HPC resources at Research Computing Services (RCS). Tasked with the successful transition of the 1PB+ GPFS/Tape storage system at the Centre for Health Genomics and Informatics (CHGI) at the Cumming School of Medicine (CSM) into RCS's service offering. Streamlined over 1000 HPC cluster nodes to Ansible, automated account vending, and implemented a robust metrics collection and reporting system.

	Major accomplishments include:		Major accomplishments include:
	* Transitioned our HPC cluster of over 1000 nodes to Ansible and automated configuration deployments and leveraging CI/CD pipelines to automate account provisioning and systems configuration.		* Transitioned our HPC cluster of over 1000+ nodes to Ansible and automated configuration deployments and leveraging CI/CD pipelines to automate account provisioning and systems configuration.
	* Automated HPC cluster usage report generation from various sources (~~Eg.~~ sensors, servers, network gear)~~. Visualize~~ CPU, memory, storage usage by users, department, and faculty ~~which was used~~ to drive proactive capacity planning.		* Automated HPC cluster usage report generation from various sources (hardware sensors, servers, network gear) into InfluxDB and visualize CPU, memory, storage usage by users, department, and faculty with Grafana to drive proactive capacity planning.
	* Developed custom log-parsing scripts to ingest Slurm jobs, system metrics, and audit logs for reports, alerting, and governance reporting.		* Developed custom log-parsing scripts to ingest Slurm jobs, system metrics, and audit logs for reports, alerting, and governance reporting.
	* Created RCS's Open OnDemand portal and containerized scientific apps, improving user productivity and easing the learning curve for users new to HPC.		* Created RCS's Open OnDemand portal and containerized scientific apps, improving user productivity and easing the learning curve for users new to HPC.
	* Implemented and maintained CloudStack as a private cloud solution and authored training materials and one-on-one workshops with researchers.		* Implemented and maintained CloudStack as a private cloud solution and authored training materials and one-on-one workshops with researchers.
	* Facilitated researchers into RCS managed AWS Control Tower environment while ensuring ~~instutional~~ security compliance and governance		* Facilitated researchers into RCS managed AWS Control Tower environment while ensuring institutional security compliance and governance

	=== Infrastructure Automation & Containers Specialist - University of Calgary (December 2018 - December 2019) ===		=== Infrastructure Automation & Containers Specialist - University of Calgary (December 2018 - December 2019) ===
	Part of a newly created team tasked with spearheading the University's first internal ~~kubernetes~~ as a service platform and VMware vRealize Automation pipeline for delivering virtual machines for secure research workloads.		Part of a newly created team tasked with spearheading the University's first internal Kubernetes as a service platform and VMware vRealize Automation pipeline for delivering virtual machines for secure research workloads.

	Achievements include:		Achievements include:
	* Ensured the smooth ~~operating~~ of ~~around~~ 8 CoreOS Tectonic Kubernetes clusters		* Ensured the smooth operation of 8 CoreOS Tectonic Kubernetes clusters while coordinating internal web team’s transition into our in-house Kubernetes infrastructure
	* Evaluated Pivotal Enterprise PKS and Red Hat OpenShift as a new managed Kubernetes solution		* Evaluated Pivotal Enterprise PKS and Red Hat OpenShift as a new managed Kubernetes solution
	* Coordinated with our internal web team to transition all of the University's websites onto our Kubernetes infrastructure
	* Built and migrated custom applications into a containerized environment using Helm charts		* Built and migrated custom applications into a containerized environment using Helm charts
	* Automated VM deployments on the University's private cloud with VMware vRealize, enabling zero-touch VM provisioning from ServiceNow and integration with Red Hat Satellite		* Automated VM deployments on the University's private cloud with VMware vRealize, enabling zero-touch VM provisioning from ServiceNow and integration with Red Hat Satellite
	* ~~Authoried~~ change-management documentation compliant with ITIL and IT policies, ensuring audit readiness		* Authored change-management documentation compliant with ITIL and IT policies, ensuring audit readiness

	=== Technical Systems Analyst for Linux Desktop - University of Calgary (July 2018 - November 2018) ===		=== Technical Systems Analyst for Linux Desktop - University of Calgary (July 2018 - November 2018) ===
	I spearheaded the standardized Linux desktop environment for the Customer Technology Services (CTS) group at the University of Calgary. Building on my ~~past~~ experience from the Computer Science department, I transitioned and unified disparate Linux desktop infrastructures across various departments into a single standardized solution managed by central IT.		I spearheaded the standardized Linux desktop environment for the Customer Technology Services (CTS) group at the University of Calgary. Building on my experience from the Computer Science department, I transitioned and unified disparate Linux desktop infrastructures across various departments into a single standardized solution managed by central IT.
	* Deployed ~~TheForeman~~, an open source alternative to Red Hat Satellite, for unattended Linux deployments supporting Fedora & Kali Linux on both Intel and ARM based computers. Used by over 250+ Linux workstations for the Department of Computer Science		* Deployed Foreman, an open-source alternative to Red Hat Satellite, for unattended Linux deployments supporting Fedora & Kali Linux on both Intel and ARM based computers. Used by over 250+ Linux workstations for the Department of Computer Science
	* ~~Wrote~~ and ~~integrated~~ Puppet ~~manifests with TheForeman~~ for ~~desired state~~ configuration ~~on all hosts~~		* Deployed infrastructure as code and CI/CD pipeline based on Puppet and GitLab for automated configuration management
	* Created and updated custom Linux based packages used by teaching and research		* Created and updated custom Linux based packages used by teaching and research
	* Consulted with faculty members to ensure software requirements required for teaching are met		* Consulted with faculty members to ensure software requirements required for teaching are met
	* Authored support materials ~~on the new deployment system~~ for technical staff in Computer Science		* Authored support materials for technical staff in Computer Science

	=== Linux System Administrator - University of Calgary (October 2012 - July 2018) ===		=== Linux System Administrator - University of Calgary (October 2012 - July 2018) ===
	I was a Linux system administrator that oversaw over 400 Linux-based servers and workstations for the department of Computer Science at the University of Calgary. I ensured that all teaching and learning needs were met with a consistent and reliable computing environment while providing end-user support for faculty, staff, and students within the department.		I was a Linux system administrator that oversaw over 400 Linux-based servers and workstations for the department of Computer Science at the University of Calgary. I ensured that all teaching and learning needs were met with a consistent and reliable computing environment while providing end-user support for faculty, staff, and students within the department.

	* Spearheaded a rewrite of the departmental firewall and ~~intrustion~~ detection system. Firewall rules were parsed and pattern matching was deployed to block malicious traffic patterns from reaching the department network		* Spearheaded a rewrite of the departmental firewall and intrusion detection system. Firewall rules were parsed and pattern matching was deployed to block malicious traffic patterns from reaching the department network
	* Modernized over 400 machines from an aging CFEngine configuration management system to SaltStack, simplifying systems provisioning and account management		* Modernized over 400 machines from an aging CFEngine configuration management system to SaltStack, simplifying systems provisioning and account management
	* Enabled visibility into lab usage with custom machine telemetry data, integrated automatic data polling of student data and courses from the IT data warehouse, and data dashboards		* Enabled visibility into lab usage with custom machine telemetry data, integrated automatic data polling of student data and courses from the IT data warehouse, and data dashboards
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	=== C# Developer - Onstream Pipeline Inspection Ltd. (2011 - 2012) ===		=== C# Developer - Onstream Pipeline Inspection Ltd. (2011 - 2012) ===
	I was one of two C# developers at a pipeline inspection company, developing their new version of pipeline analysis software.		I was one of two C# developers at a pipeline inspection company, developing their new version of pipeline analysis software.
	* Debugged existing in-house software written in Borland C++ on ~~the~~ Windows ~~platform~~		* Debugged existing in-house software written in Borland C++ on Windows while working with low-level hardware interfaces with custom in-house pigs
	* Low-level hardware ~~interface~~ with custom ~~designed~~ pigs		* Developed analysis software using C# .NET4 to visualize pipeline data
	* Developed ~~the next version of their~~ analysis software ~~from scratch~~ using C# .NET4

	=== Freelance Web Developer & Designer – Steamr (2005 - 2015) ===		=== Freelance Web Developer & Designer – Steamr (2005 - 2015) ===
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	* Performed security audits and server hardening, firewall and intrusion detection in a shared hosting environment		* Performed security audits and server hardening, firewall and intrusion detection in a shared hosting environment
	=== AS/400 Night Operator - Calgary Programming Factory (2007) ===		=== AS/400 Night Operator - Calgary Programming Factory (2007) ===
	I worked as night operator as part of the AS/400 support team at the Calgary Programming Factory for The Sovereign General Insurance Company ~~as a summer job~~.		I worked as night operator as part of the AS/400 support team at the Calgary Programming Factory for The Sovereign General Insurance Company.
	* Operated the tape backup system, ensuring backups are valid and without errors.		* Operated the tape backup system, ensuring backups are valid and without errors.
	* Operated the AS/400 system to print system logs and claim ~~checks~~		* Operated the AS/400 system to print system logs and claim cheques
	* ~~Ensured paper was loaded and aligned properly to the printers before printing~~		* Performed a feasibility study on moving existing projects based on JSP servlets to ASP.NET
	* Researched feasibility ~~to migrate their~~ existing projects based on JSP servlets to ASP.NET

	== Education & Training ==		== Education & Training ==
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	== Personal ==		== Personal ==
	* Languages: English, Cantonese		* '''Languages''': English, Cantonese
	* Interests: system infrastructure, systems security, game development, electronics & hardware tinkering		* '''Interests''': system infrastructure, systems security, game development, electronics & hardware tinkering