Sr. IT System & Network Administrator/Administrateur principal ou Administratrice principale, systèm

Job Summary: Reporting to the Infrastructure Manager, the Sr. IT System & Network Administrator is a senior technical and delivery-focused role responsible for architecting, implementing, and evolving on‑premise, hybrid, and cloud-based infrastructures. This role goes beyond day‑to‑day administration and acts as a technical lead for complex infrastructure initiatives, with full end‑to‑end responsibility including analysis, design, implementation, documentation, knowledge transfer, and operational handover. The Sr. IT System & Network Administrator is expected to demonstrate strong leadership in cloud platforms, infrastructure as code, security best practices, and cross‑functional project coordination. They serve as a technical reference for Infrastructure and Support teams while ensuring that infrastructure solutions align with business, security, and compliance requirements. Key Responsibilities: Cloud & Hybrid Infrastructure Leadership Design, deploy, and manage cloud and hybrid infrastructures (IaaS, PaaS, hybrid connectivity) aligned with business and security requirements. Lead architecture decisions related to cloud networking, identity, access management, backup, disaster recovery, monitoring, and cost optimization. Define and enforce infrastructure standards, naming conventions, network segmentation, and security baselines across cloud and on‑prem environments. Ensure high availability, scalability, performance, and resilience of critical systems. End‑to‑End Project Management: Own infrastructure projects from initiation to closure, including requirements gathering, solution design, effort estimation, risk identification, execution, and post‑project review. Act as the technical project lead for infrastructure initiatives involving internal teams and external partners. Coordinate dependencies across Infrastructure, Helpdesk, Security, Development, and third‑party vendors. Ensure deliverables meet scope, quality, timeline, and documentation expectations. Advanced Systems & Network Administration Administer and optimize complex server, storage, virtualization, and network environments. Lead implementation of advanced networking concepts (segmentation, firewalls, VPNs, secure remote access, multi‑site connectivity). Oversee identity and access management solutions, including MFA and privileged access controls. Drive automation initiatives for provisioning, monitoring, configuration management, and reporting. Security, Compliance & Reliability Integrate security best practices into infrastructure design and operations (zero trust principles, least privilege, secure configurations). Support compliance requirements from external regulators, certifications, and regional authorities. Define and test backup, disaster recovery, and business continuity strategies. Proactively identify risks, technical debt, and opportunities for infrastructure improvement. Documentation, Standards & Knowledge Transfer Produce clear, structured, and reusable documentation for architectures, deployments, procedures, and operational runbooks. Ensure a smooth transition of delivered solutions to operations and support teams. Mentor and provide technical guidance to junior administrators and analysts. Contribute to the continuous improvement of IT standards, tools, and operating practices. Required Skills & Experience: DEC or higher education in Computer Science or equivalent experience. Professional certifications in cloud or infrastructure technologies are considered an asset. 7+ years of experience in system and network administration, with progressive responsibility in complex environments. Strong experience with cloud platforms and hybrid infrastructures. Excellent knowledge of networking concepts, firewalling, routing, segmentation, and secure connectivity. Advanced knowledge of Windows server environments and modern infrastructure services. Experience with automation, scripting, or infrastructure‑as‑code concepts. Solid understanding of monitoring, backup, disaster recovery, and high‑availability architectures. Proven experience leading infrastructure projects end‑to‑end. Strong analytical and problem‑solving skills with a structured approach to delivery. Ability to communicate technical concepts clearly to both technical and non‑technical stakeholders. Excellent organizational and documentation skills with strong attention to detail. Ability to work autonomously while collaborating effectively across teams. Fluent in French and English, both spoken and written.

The role is responsible for architecting, implementing, and managing on-premise, hybrid, and cloud-based infrastructures. It involves leading complex infrastructure projects from design to operational handover while ensuring security and compliance.

Requires a DEC or higher in Computer Science and over 7 years of experience in system and network administration. Candidates must be fluent in English and French with strong expertise in cloud platforms and networking.

• Project managementPreferred

Identified from the job description. Confirm important requirements above.

• Cloud Infrastructure
• Hybrid Infrastructure
• Network Administration
• Infrastructure as Code
• Windows Server
• Firewalling
• Virtualization
• Disaster Recovery
• Identity and Access Management
• Project Management
• Automation
• Network Segmentation
• Security Best Practices
• Backup Management
• Technical Documentation
• Monitoring

• Technology
• Engineering
• Consulting
• Security & Safety
• Management & Leadership

Minimum education

College diploma

Minimum experience

7+ years

Apply by

Sep 23, 2026

Posting language

English

Working hours

40 hours per week

Seniority

Mid-Senior level