Senior Network Security Engineer

Location: Toronto, ON, Hybrid, 3 days onsite per week
Language: English, advanced written and verbal communication required
Duration: 6-month contract with potential 6-month extension
Background Check Requirement: Criminal background check may be required

About the Opportunity
A large public sector organization is seeking a Senior Technology Architect to support critical enterprise infrastructure and cybersecurity initiatives within a complex, high-availability environment. This role is ideal for a seasoned infrastructure and security professional who thrives in large-scale enterprise settings and enjoys solving complex networking and security challenges that directly support essential public services.

You will work alongside experienced infrastructure, security, and operations teams to strengthen enterprise architecture, support secure connectivity, and lead technical remediation and modernization efforts. The environment is highly collaborative, fast paced, and focused on operational excellence, resiliency, and continuous improvement.

What’s In It for You
• Opportunity to work on enterprise-scale infrastructure and security modernization initiatives
• Exposure to complex networking, cloud, and perimeter security environments
• Collaborative team culture that values technical expertise and knowledge sharing
• Flexible hybrid work model with meaningful, high-impact project work
• Opportunity to contribute to critical public sector technology operations and security initiatives

Your Responsibilities
• You’ll lead the design, implementation, and support of enterprise network and security architecture solutions
• In this role, you’ll manage and optimize high-availability infrastructure including F5, Checkpoint, proxy, and remote access technologies
• You’ll oversee technical vulnerability assessments and support remediation of security incidents across enterprise environments
• You’ll analyze network traffic and authentication protocols to troubleshoot and strengthen security posture
• In this role, you’ll support cloud and clustered infrastructure solutions within complex LAN/WAN environments
• You’ll collaborate with cross-functional teams to ensure infrastructure reliability, scalability, and compliance with security best practices
• You’ll participate in after-hours migration and implementation activities as required

Skills and Qualifications
• 10+ years of progressive experience in computing infrastructure and information security within large enterprise environments
• Expert-level experience with F5 LTM, APM, ASM, and GTM technologies
• Strong experience managing clustered high-availability firewalls, load balancers, and proxy technologies including Checkpoint, Broadcom ProxySG, and Zscaler ZIA
• Advanced understanding of networking technologies, authentication protocols, and information security best practices
• Hands-on experience with vulnerability assessments, intrusion detection, and perimeter network security
• Experience supporting LAN/WAN, cloud infrastructure, and remote access environments
• Degree in Computer Science, Engineering, Technical Diploma, or equivalent combination of education and experience

Why Partner with Altis
If you’ve never worked with a staffing agency before, we make it easy. We work with top employers across Canada who have great jobs to fill, each vetted and verified by our team. When you apply for a job with Altis, we get to know you as a candidate and learn what your strengths are. Then, if you’re a solid match, we handle all the logistics, advocating for you as a candidate for the role, providing access to coaching and connecting you directly with the hiring manager. And rest assured, all our services are free of cost for candidates.

We appreciate the time and effort all applicants invest in their submissions. Please note that only candidates shortlisted for this role will be contacted directly. However, your profile will remain under consideration for future opportunities that align with your experience and career goals. All qualified applicants will receive fair consideration for employment. We welcome individuals of all backgrounds, experiences, and identities including those who identify as women, members of racialized groups, Indigenous Peoples, persons with disabilities, and 2SLGBTQIA+ communities. If you require an accommodation, please review our accessibility policy and reach out to our accessibility officer with any questions. Our human recruiters review all applications and always make the final hiring decision. On occasion, we also use AI-assisted tools to help review applications.