Senior Network Security Engineer

Opticore IT is a specialist Network Engineer and Project Management consultancy offering a wide variety of opportunities to work within fast-paced, challenging environments across our client base spanning multiple sectors including Finance, Broadcast Media, Telecommunications, and more.

Opticore IT is currently searching for a Senior Network Security Engineer to support our client in a critical migration project from a cloud-based proxy solution (Netskope) to an on-premise proxy infrastructure. This role requires deep technical expertise in proxy technologies, a solid security mindset, and familiarity with automation practices.

You will join our excellent team, based in the London area, on an initial 6-month contract, inside IR35, with scope to extend. The role requires working 2 days a week at our client's HQ near Tottenham Court Road.

What you'll be doing:

• Leading the migration from a cloud proxy (Netskope) to an on-premise proxy solution.
• Designing and implementing proxy policies that ensure secure, scalable, and efficient traffic control.
• Configuring and managing advanced features such as SSL inspection, re-termination, web sockets, and custom policy creation.
• Ensuring granular control over web traffic and enforcing enterprise security standards.
• Providing strategic guidance on multi-product proxy environments, identifying potential compatibility or integration challenges.
• Supporting automation of policy deployment and configuration tasks where feasible.
• Collaborating with stakeholders to understand business needs and translate them into technical solutions.
• Conducting testing and validation of the new proxy infrastructure before go-live.
• Monitoring and troubleshooting proxy-related issues during and after the transition.
• Providing technical documentation and knowledge transfer to client teams.

What you'll bring:

• Proven experience with enterprise-level proxy technologies, including cloud and on-premise solutions, especially large-scale migration projects involving critical infrastructure.
• Strong understanding of multi-product environments in the proxy/security space.
• Expertise in configuring and managing web sockets, SSL inspection, and policy creation.
• Hands-on experience with traffic re-termination, deep packet inspection, and encrypted traffic analysis.
• Familiarity with automation tools and frameworks (e.g., Ansible, Terraform, Python scripting).
• A strong security mindset, with knowledge in threat detection, data protection, and compliance.
• Excellent troubleshooting, documentation, and communication skills.

Diversity:

At Opticore IT, we embrace diversity and are committed to equal opportunities. We actively recruit for an inclusive and diverse workforce. Please let our recruitment team know if you require any adjustments during the application or interview process.