Full Stack Software Engineer in London, United Kingdom

Hadean is a deep-tech company building cutting-edge distributed computing technology that powers scalable, secure, and interoperable digital environments. Our platform enables real-time simulation and training, mission rehearsal, command & control and digital twin capabilities - transforming the way defence, government agencies and enterprises plan, train, and make decisions.

We work at the forefront of defence innovation, collaborating with global partners to deliver next-generation capabilities that unlock operational advantage.

The Team:

dominAI is a close-knit team of highly technical, deeply collaborative engineers — each bringing genuine specialism to a shared mission. We move fast, hold each other to a high standard, and take real pride in what we ship. We work in sprints, building MVPs that are regularly taken out to industry events, integration hackathons, and live demonstrators. There's no waiting months to see your work matter - the feedback loop between building and showing is tight, and it shapes what we build next. We're also a team that invests in itself: continuous learning, honest retrospectives, and a genuine culture of craft are part of how we operate.

This is a new product for Hadean. We're building it quickly and building it right - and the people who join now will shape its direction.

The Role:

As a Software Engineer in the dominAI team, you will build across the full stack of our next-generation command and control platform. This is a system that enables commanders to plan and assess targeting outcomes in minutes rather than hours by embedding AI and large-scale simulation directly into the C2 workflow. You will work within a cross-functional team of AI, simulation, and infrastructure specialists, contributing to backend services that integrate with diverse simulation and analysis pipelines and to the web interfaces through which commanders and staff interact with those capabilities. You will own features end to end, supported by senior engineers who invest in your growth through mentorship, pairing and code review. As your judgement across the stack develops, so will the scope you take on.

Key Responsibilities:

• Develop and maintain the dominAI web application using React and TypeScript, building reliable and performant interfaces for complex operational data.

• Build and extend backend services in https://jobeax.com/link/JSd7UYCSg572jJDY that integrate with AI inference pipelines and simulation systems.

• Own well-scoped features end to end - from refining the requirement through to shipping and supporting it in use.

• Work with the team to plan and execute development sprints, and provide well-reasoned estimates for your own work.

• Collaborate with UX designers to create clear, high-impact interfaces for complex data sets.

• Maintain a high bar for quality through automated and manual testing, in collaboration with QA and through code review.

• Grow your skills across the stack through pairing and code review with senior engineers.

Skills, Knowledge and Experience

• A degree in Computer Science, Software Engineering, or a related field - or equivalent practical experience.

• Professional experience building web applications with React and TypeScript.

• Working proficiency in https://jobeax.com/link/JSd7UYCSg572jJDY - comfortable contributing to backend services, not just consuming them.

• Strong communication skills - able to explain your work to engineers and stakeholders; quick to ask good questions and surface issues.

• Curious and quick to learn - you actively seek feedback and act on it.

• Ability to obtain and maintain UK Security Vetted status to at least SC level.

• Willingness to attend our office in Shoreditch at least once a week.

What will help you stand out

• Experience with:

  • Frontend tooling we use: Vite

  • API design, data modelling, or backend integration patterns.

  • Event-driven architectures, message queues, or real-time data systems.

  • Component and styling libraries e.g. MUI, Tailwind.

  • State management libraries e.g. Zustand, Immer.

  • Integrating with or building around AI services or simulation platforms.

• Evidence of advocating for best practices or improving the team you were in

• Experience with C++ or Rust

• Interest or familiarity with the defence sector, Military Modelling and Simulation, or C2 systems.

• An interest in travelling to support customer deployments, hackathons, and industry events.

Job Benefits

We make Hadean an awesome place to work with competitive benefits

• Hybrid working with 1 day per week in our fantastic office in Shoreditch, London

• Private Health Insurance

• Enhanced pension scheme

• Enhanced parental leave

• 3 extra days off at Christmas (on top of our standard 25)

• L&D budget

• Regularly scheduled socials

• Share options

A Place For Everyone

We believe diversity drives innovation and for that reason we strongly encourage those from all backgrounds to apply for roles at Hadean. We are an equal opportunity employer and aim to build a workforce that is truly representative of the communities in which we operate and our clients.