Contract Duration: Through December , with potential extension Target Start: November preferred; project kickoff January Work Arrangement: Hybrid - North Mississauga or South Brampton, approximately 2-4 days onsite per week Position Overview: Our retail client is looking for an experienced linux Security Engineer to support the implementation of an enterprise SSH key-management solution.

The organization has completed initial proof-of-concept work and is preparing to roll out the solution across its Linux & Unix environments.

The project will involve defining technical requirements, developing deployment approaches and implementing the solution in phases.

The successful candidate will bring strong hands-on Linux and Unix and SSH security experience, working closely with infrastructure, SRE, network, security and change-management teams to support the implementation.

This is a hands-on technical delivery role requiring someone who understands SSH key management, can work through complex implementation challenges and help ensure secure, scalable deployments across enterprise environments.

Required Skills & Experience Solid hands-on experience administering, configuring and troubleshooting enterprise Linux and Unix environments and OpenSSH.

Deep understanding of SSH authentication, public-private keys, authorized keys, trust relationships, SSH configurations and key lifecycle management.

Experience implementing or supporting SSH security, SSH key management or access-management solutions in enterprise environments.

Experience translating technical requirements and solution designs into deployment patterns, implementation procedures and production-ready solutions.

Strong understanding of Linux-Unix security configurations, authentication mechanisms and technical dependencies across different operating systems.

Experience supporting large-scale infrastructure or security implementations,



including phased deployments, testing, troubleshooting, change management and rollback planning.

Ability to assess technical approaches, identify implementation risks and recommend secure, scalable solutions.

Strong communication skills and experience working with infrastructure, SRE, network, security and external vendor teams.

Key Responsibilities Support the implementation and phased rollout of an enterprise SSH key-management solution across Linux-Unix environments.

Work with internal technical teams and vendors to define solution requirements, deployment approaches and implementation plans.

Assess existing Linux-Unix environments to understand SSH configurations, authentication methods, access patterns and technical dependencies.

Develop and validate deployment patterns across different Linux-Unix operating systems and OpenSSH versions.

Support SSH key discovery, inventory, lifecycle management and the implementation of security controls.

Work with infrastructure and SRE teams to define automation requirements and support the deployment of SSH configurations and security controls at scale.

Coordinate technical testing, troubleshooting, change management and rollback planning to support production deployments.

Identify technical risks, compatibility issues and implementation challenges, working with cross-functional teams to resolve them.

Develop technical documentation, implementation procedures, test plans and operational runbooks.

Nice to Have Experience with Ansible or equivalent infrastructure automation and configuration-management tools.

Experience implementing enterprise SSH key-management platforms.

Knowledge of SSH certificate-based authentication, PKI, machine identity and cryptographic key management.

Familiarity with privileged access management and Zero Trust security concepts.

Experience supporting large-scale Linux-Unix security modernization initiatives.

📌 Senior Linux Engineer – SSH Key Management & Security (Toronto)
🏢 S.i. Systems
📍 Toronto