Simulation Software Engineer
You'll own substantial parts of a simulation engine that powers continent-scale defence training environments — covering the behaviour and interactions of pedestrians, traffic, shipping, aircraft, satellites, and critical national infrastructure. You'll shape how simulated actors decide and act, how simulation state stays coherent across a compute cluster, and how LLM-backed capabilities (natural language control, actor generation, simulated social media) are brought into the engine.
Work spans a C++ simulation engine, a custom distribution framework, and a TypeScript/React front-end, within a cross-functional team of Software, QA, and DevOps Engineers.
Key Responsibilities
* Design and implement behaviour/decision-making logic for simulated entities in C++
* Integrate third-party simulation libraries into a coherent system
* Design simulation state partitioning across a distribution framework (IPC, bandwidth, fidelity)
* Extend REST services and TypeScript/React front-end across the web/sim boundary
* Write design docs and run design reviews
* Review peers' designs and code; collaborate with Product and defence stakeholders
* Mentor teammates through pairing and code review
* Deploy and support the product on-site at customer exercises, hackathons, and industry events
Requirements
* 4+ years software engineering experience
* Experience in behavioural or agent-based simulation (game AI, VFX crowd sim, CGF, or similar)
* Strong C++ for performance-sensitive, real-time systems
* Knowledge of spatial data structures, path planning, decision modelling, vehicle movement
* Ability to reason about distributed simulation design (IPC, bandwidth, domain partitioning)
* Comfortable moving between languages and stack layers
* Proactive, communicative style — able to challenge and draw out contributions
* Product engineering mindset
* Comfortable with AI-assisted development workflows
* Eligible for UK SC-level security clearance
* Able to attend Shoreditch office at least once per week
Nice to Have
* LLM-enabled product feature experience (NL interfaces, content generation, agent behaviour)
* Rust, particularly for distributed/systems-level work
* Geospatial concepts and map data processing for simulation
* Defence sector, military modelling/simulation, or wargaming familiarity
* Kubernetes for compute cluster orchestration
* Prior tech lead experience or interest in that pathway
Benefits
* Hybrid (1 day/week in Shoreditch)
* Private health insurance
* Enhanced pension
* Enhanced parental leave
* 3 extra days off at Christmas (on top of 25 days)
* L&D budget
* Regular socials
* Share options