Senior Network Security Engineer Networks · London

OpticoreIT Limited; London; On-site; GBP 70,000 - 90,000; Full time

Job summary

Opticore IT is seeking a Senior Network Security Engineer for a critical migration project in London. The ideal candidate will possess extensive experience with proxy technologies and a security-focused mindset. In this role, you'll lead the migration from a cloud-based solution to an on-premise environment, ensuring efficiency and security while working closely with various stakeholders.

Benefits

Diversity and inclusion commitment

Support during application process

Qualifications

• Experience with enterprise-level proxy technologies, especially large-scale migration.
• Strong understanding of multi-product environments in proxy/security.
• Knowledge of automation tools and frameworks.

Responsibilities

• Leading migration from cloud proxy to on-premise solution.
• Designing proxy policies and managing advanced features.
• Conducting testing and validation of new proxy infrastructure.

Skills

Automation skills

Troubleshooting

Documentation

Communication

Tools

Netskope

Ansible

Terraform

Python scripting

Job description

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. The ideal candidate will have 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 in the Tottenham Court Road area.

What you'll be doing:

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

What you'll bring:

1. Proven experience with enterprise-level proxy technologies, including cloud and on-premise solutions, especially large-scale migration projects involving critical infrastructure.
2. Strong understanding of multi-product environments in the proxy/security space.
3. Expertise in configuring and managing web sockets, SSL inspection, and policy creation.
4. Hands-on experience with traffic re-termination, deep packet inspection, and encrypted traffic analysis.
5. Knowledge of automation tools and frameworks (e.g., Ansible, Terraform, Python scripting).
6. A strong security mindset, with familiarity in threat detection, data protection, and compliance.
7. 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 we support your application throughout the process. Please inform our recruitment team if you require any adjustments to be made during your application or interview.