Frontend Developer in London

Join one of the UK’s most ambitious AI-defence startups, backed by top-tier investors and moving fast. They are building intelligent systems that operate in high-stakes environments and looking for a founding level engineer to craft the interface through which humans will guide, trust, and collaborate with these machines.

What will I do?

• You’ll own the design and development of the core frontend platform - the window into their technology. This means building responsive, intuitive UIs that distil complex data into insight, enable precision control of autonomous systems, and deliver situational awareness in real time.
• You’ll work directly with users (from engineers to field operators) and collaborate daily with top minds in AI, robotics, and systems engineering.
• You will define the technology stack for the frontend team, looking to grow to 5 engineers by end of 2025.

What They’re Looking For:

• Deep frontend engineering experience using modern JavaScript/TypeScript frameworks (React, Angular, or similar).
• Comfort designing frontend architectures in greenfield environments.
• A CS or technical background - you understand what’s happening under the hood.
• Bonus: experience with 3D/mapping libraries (Mapbox, Cesium, WebGL) or backend work in Rust, Python, or C++.

Why Join Them?

• Mission with Impact – You’ll be building tools that have real-world significance in national security and defence.
• True Ownership – You’ll have end-to-end control over a mission-critical product, with direct access to users and real influence over product direction.
• Elite Team – Work alongside top engineers and researchers in a focused, no-ego culture that values initiative, creativity, and velocity.
• Startup Momentum – Competitive salary (up to £110k), meaningful equity, and the chance to grow with a fast-scaling company at the intersection of AI and defence.