IT infrastructure & operations
Jianheng (Patrick) Jiang
IT Specialist System Administrator
Greater Toronto Area, Ontario, Canada
IT Specialist and System Administrator with more than seven years of experience managing business-critical infrastructure, cloud services, identity platforms, networks, and technical support operations.
PJInfrastructure · Identity · Networks
01 / About
Reliable systems.
Clear technical leadership.
Patrick is an IT infrastructure professional with more than seven years of experience administering systems and supporting people across office, field, and remote environments.
His work spans Microsoft cloud and identity platforms, network operations and security, endpoint management, virtualization, monitoring, and incident resolution. He combines hands-on technical delivery with team leadership, practical documentation, and employee training—helping keep critical services secure, understandable, and dependable.
7+Years in IT
250Employees supported
50+Remote sites connected
02 / Core competencies
Capabilities that keep operations moving
End-to-end technical experience across infrastructure, platforms, and support.
System administration
Microsoft 365 administration
Identity & access management
Network administration
Endpoint management
Virtualization
Infrastructure monitoring
Incident & service management
Technical support & leadership
03 / Experience
Professional experience
Current role
IT Specialist
Matheson Constructors
- Lead IT operations supporting approximately 250 employees across multiple locations.
- Direct a team of two support specialists.
- Develop IT policies and provide employee training on hardware and software platforms.
- Manage secure network connectivity for more than 50 remote construction sites using Aruba infrastructure.
- Administer Microsoft 365 services, including Exchange, Teams, and SharePoint.
- Manage identities and software licensing through Microsoft Entra ID and Active Directory.
- Coordinate with technology vendors on products, services, support requirements, and issue resolution.
- Maintain hardware and software inventory records to support asset tracking, licensing, and lifecycle management.
Network/Infrastructure Technician
Bell Canada
- Diagnosed and resolved critical network failures while meeting service-restoration objectives.
- Completed network cutovers and hardware upgrades according to engineering work orders.
- Performed acceptance testing for newly commissioned sites and equipment.
- Maintained technical documentation, trouble tickets, and incident reports throughout field-service work.
- Provided remote connectivity support through phone and Zoom.
System Administrator
IRSV
- Helped implement a Jira ticketing system for incident tracking and workflow management.
- Configured and maintained Synology NAS and VPN infrastructure for remote operations.
- Performed Linux server backups in a VMware environment.
- Investigated and resolved NAS, VPN, and remote-connectivity issues.
- Documented root-cause analyses and created technical runbooks to support consistent incident resolution.
Infrastructure Service Specialist
Northfield IT
- Monitored web infrastructure with Nagios, Prometheus, and OCUM.
- Resolved server, application, and network incidents within SLA requirements.
- Managed the complete incident lifecycle through Jira.
- Developed a Slack automation tool using Hubot and CoffeeScript.
- Supported web applications and hardware using documented remediation procedures.
04 / Featured projects
Technology in practice
Selected work in infrastructure modernization, cloud security, and AI-assisted workflow automation.
01 / AI & automation
Custom Codex skillIntelligent Invoice Processing and Expense Automation
Role: Designer and Developer
Challenge
Expense processing required invoices or receipt images to be collected, interpreted, validated, checked for duplicate submissions, and entered into an internal expense-management system.
Solution
Created a custom Codex skill that retrieves Amazon invoices or processes receipt images, uses OCR to extract structured transaction data, validates tax information, and detects potential duplicates.
Patrick’s role
Designed the end-to-end workflow, document-processing logic, validation controls, audit trail, and human approval step before submission.
Outcome
Automated repetitive invoice collection, data extraction, validation, and expense-entry tasks while preserving traceability and human oversight.
02 / Infrastructure
October 2024Office Networking and Infrastructure Upgrade
Role: Lead
Challenge
Modernize network and virtualization infrastructure across three regional branches while maintaining high availability and minimizing operational downtime.
Solution
Migrated more than 30 network devices to a unified Fortinet solution, moved VMware ESXi 6.7 workloads to Proxmox VE, and designed a scalable IP-addressing and VLAN framework.
Patrick’s role
Led the migration, worked with Dell PowerEdge R760 servers and Dell ME5024 SAN storage, and created technical documentation and network-topology diagrams.
Outcome
Completed the cross-branch infrastructure migration while maintaining availability and limiting operational disruption.
03 / Cloud & security
August 2023Microsoft 365 Optimization and Security Enhancement
Role: Lead
Challenge
Strengthen access controls, endpoint administration, and security-response processes across corporate devices and cloud services.
Solution
Deployed Microsoft Intune MDM for Windows and Android, implemented Entra ID Conditional Access based on location and device identity, and integrated SAML SSO.
Patrick’s role
Led the deployment and developed incident-response procedures for Microsoft Defender alerts.
Outcome
Established centralized device administration, contextual access controls, federated sign-on, and documented security-response workflows.
05 / Technical skills
Technical toolkit
Identity & access management
Active Directory · Microsoft Entra ID · SAML SSO · Conditional Access
Cloud & endpoint administration
Microsoft 365 · Microsoft Intune · Office 365 · Microsoft Defender · Exchange · Microsoft Teams · SharePoint
Virtualization & servers
VMware ESXi · Proxmox VE · Dell PowerEdge · Linux
Networking & security
Fortinet · Barracuda · Aruba · VPN · VLAN design · Network troubleshooting
Storage
Dell ME5024 SAN · Synology NAS · OCUM
Monitoring, automation & service management
Nagios · Prometheus · Hubot · CoffeeScript · Jira
06 / Credentials
Education & certifications
Education
Diploma with Honours in Business Information Technology
Red River College
Completed May 2020Certifications
Professional credentials
- CCNA
- Fortinet FortiGate Operator
07 / Contact
Let’s connect.
For IT infrastructure, system administration, and technical operations opportunities, reach out directly.
Email PatrickLocationGreater Toronto Area, Ontario, Canada