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 are 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 with deep technical expertise in proxy technologies, a solid security mindset, and familiarity with automation practices to come and join the team. You'll join our excellent team, based in the London area on an initial 6-month contract, inside IR35, with scope to extend. Requiring 2 days a week in our client's HQ in the Tottenham Court Road area.

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 enforce 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.
• Working with stakeholders to understand business needs and translate them into technical solutions.
• Conducting testing and validation of 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 history in enterprise-level proxy technologies, including cloud and on-premise solutions, including 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 retermination, deep packet inspection, and encrypted traffic analysis.
• Aware of automation tools and frameworks (e.g., Ansible, Terraform, Python scripting).
• A strong security mindset, with familiarity 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, and as such, we want to ensure we do everything we can to support your application. We want you to feel empowered to let us know if you require any adjustments to be made with your application or interview process, so please speak to our recruitment team.