Senior Software Engineer: CNI Guardian

You've shipped embedded systems. Now build one that protects the UK's power grid.

Kry
10 builds exceptionally resilient systems for mission-critical devices. We've just been awarded a contract to deliver CNI Guardian — a highly assured network guard protecting the protocols behind the UK's power, gas, and water networks.

We've appointed a senior researcher for the security and OT/CNI domain side. Now we need an equally senior software engineer to own the other half:
architecture, the embedded build, and real-world delivery. You'll be the person who makes sure CNI Guardian is well-architected, properly built, tested, deployed, and maintainable — taking it from prototype to a system running on real infrastructure.

• 5+ years' software engineering, with a real track record of delivering and maintaining shipped systems
• Substantial embedded development in C and/or Rust
• Strong software architecture — designing systems and defending the decisions
• Networking, protocols, and secure systems experience
• Comfortable with messy, under-specified real-world systems.

• experience using AI-assisted tooling to build embedded software; industrial protocols (Modbus, DNP3, OPC-UA, IEC 61850) or OT devices; energy-sector or grid experience; firewall / inline-processing work.

• Your work will protectactual UK Critical National Infrastructure
• It won't disappear behind an NDA — you can publish, speak, and build a public reputation on it
• Deep technical support: OT experts and world-class systems and security people alongside you
• Hands-on OT test lab in Gloucester — real PLCs, real RTUs, real protocols
• Small, fast team in a global startup; decisions in days, not quarters

Start ASAP (ideally by September). Process is a couple of short calls plus an in-depth technical conversation on-site in Gloucester. For further questions or queries please email

Apply: CV + short covering letter to , subject "UK Senior Software Engineer: CNI Guardian (IET) - [Your Name]". Tell us in your covering letter: what draws you to working on software engineering for Critical National Infrastructure specifically — and what experience or perspective would you bring to it?

Kry
10 is an equal opportunity employer. This role is subject to security, export control and/or contractual restrictions, including eligibility to work in the UK. We welcome applications from disabled candidates and are happy to discuss reasonable adjustments.