Lead Technical Architect

We're looking for a Lead Technical Architect who enjoys solving difficult technical challenges and wants their work to have real operational impact.

What You'll Do

As a Lead Technical Architect, you'll lead a comprehensive assessment of a client's ultra-secure network estate. The role will evaluate current infrastructure, identify risks and gaps, and produce recommendations for modernisation, replacement, or upgrade strategies. Must be DV-cleared and experienced in UK public-sector secure environments.

Your work may include:

• Lead end-to-end technical assessment of complex, high-security network environments.

• Analyse architecture, design, configurations, security controls, and operational processes.

• Produce detailed findings, strategic options, and modernisation roadmaps.

• Engage with stakeholders, run workshops, and challenge existing assumptions.

• Oversee a small technical team delivering discovery, documentation, and analysis.

• Ensure recommendations align with national security standards and accreditation requirements.

We value people who take ownership, think critically, and enjoy working as part of a collaborative team tackling complex challenges. You don't need to tick every box, but we're particularly interested in people with skills/experience in:

• Extensive experience designing and assessing secure networks (LAN, WAN, firewalls, VPN, segmentation, zero-trust).

• Deep understanding of protective monitoring, cryptography, network hardening, and cross-domain solutions.

• Strong documentation, architecture modelling, and communication skills.

• Experience with government security frameworks (NCSC, JSPs, PSN, NIS).

Just as important are curiosity, strong problem solving ability, and the motivation to continuously improve how technology is designed and delivered., As an end-to-end digital innovation and delivery partner, we turn complex challenges into mission-critical digital advantages. This is a thrilling time for us, with ambitious plans for growth. We are looking for brilliant, experienced, driven and self-motivated people to join the team on our journey.

A word on UK Security Clearance

Due to the secure nature of the position and working environment, you must have or be eligible to obtain the highest level of Security Clearance. More details relating to UK Security Clearance can be found here

SiXworks is a specialist digital innovation partner delivering secure, mission-critical technology to Defence and National Security organisations. We focus on digital experimentation, secure-by-design architecture, cloud technologies, and rapid application development to help our customers move faster and stay ahead of evolving challenges. Our team combines expertise from across technology, business, and operational backgrounds including the armed forces creating a collaborative environment where practical thinking and innovation thrive. Why Join Us Our culture is guided by six principles: Agility, Security, Innovation, Quality, Collaboration and Inclusivity our North Star for how we work. SiXworks is a leading provider of secure digital solutions, specialising in digital experimentation and focused on fail-safe-fast cutting-edge technology solutions deployed in highly secure environments.