Principal Software Engineer

Software Engineer (Simulation & Frameworks) - Senior/Principal £70k–£90k | UK Remote (travel to UK/US hubs) | Permanent We're working with a pioneering deep-tech company building next-generation photonic computing systems - using light, not electricity, to power the AI and cryptography workloads of tomorrow. It's a genuinely novel architecture, built by a small, ambitious team with big backing. They're now expanding their Architecture group and looking for two experienced engineers to help build the in-house simulation environment behind their flagship compute platform - the tool that lets the whole team understand, test, and refine the system before it ever hits silicon. What we're after: ✅ 10+ years' Python or C/C++ ✅ Experience with event-based simulators (e.g. SimPy) ✅ Strong grasp of SoC and memory architectures ✅ Comfortable writing specs, test plans and reports ✅ Confident communicating with technical and non-technical stakeholders ✅ Bonus points for AI/ML, HPC, cryptography, Rust or CI/CD exposure What's in it for you? 💡 Work on a genuinely novel compute architecture, not another CRUD stack 🏡 Fully remote, with occasional travel to UK/US hubs 💰 Competitive salary plus bonus and pension matching 🩺 Comprehensive healthcare 🌴 Generous time off 🚀 Real influence over how the architecture takes shape You'll sit right at the software-hardware boundary, building the metrics, tooling and integrations (PyTorch, ONNX, HEIR) that make rapid bring-up possible - and mentoring others as the team grows around you.