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 brand 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: This is an opportunity to be part of something that doesn't exist yet — at least not in the way we're building it. We're combining rich data from best-in-class defence software and hardware, presenting it through a modern command and control interface, and bringing the latest AI techniques to bear on some of the most critical analysis and planning challenges in the defence sector. The goal is to give decision-makers information advantage at the moment it matters most. As a Senior AI Engineer in dominAI, you will be responsible for integrating Large Language Models and broader AI capabilities into production-grade software that real operators will depend on. You'll work as a core member of a cross-functional team alongside Product Managers, other engineers, and domain experts - translating ambitious product requirements into reliable, scalable, and impactful technical solutions. This isn't a role about exploring AI in theory. It's about shipping AI that works, in conditions that matter, to users with no tolerance for failure. If that challenge excites you, you'll fit right in. Key Responsibilities: - Design, build, and deploy production-grade software that integrates AI to solve complex, real-world user problems. - Research and evaluate emerging AI architecture patterns - RAG, agentic workflows, evals, fine-tuning, LLM orchestration - and apply findings directly to the product. - Collaborate closely with Product Managers and cross-functional teammates to translate requirements into technical solutions that ship. - Mentor and upskill engineers across the team on AI technologies and best practices, raising the collective capability of the group. - Champion and embed agentic engineering tools and practices into the team's daily workflow to accelerate delivery. - Write clean, maintainable, and efficient code in TypeScript and/or Python, holding yourself and others to a high standard. - Ensure the reliability and scalability of AI-powered features in a production environment - this software operates in demanding contexts. - Stay current with the rapidly evolving AI landscape; bring ideas back to the team and help shape our technical direction. Skills, Knowledge and Experience: - A degree in Computer Science, Software Engineering, or a related field - 3+ years professionally developing products involving AI or LLMs - Proven experience deploying AI in a production software environment - you've shipped things and learned from them. - Deep understanding of AI architectures and patterns: RAG, prompt engineering, fine-tuning, evals, and LLM orchestration. - Strong background as a generalist software engineer with proficiency in TypeScript and/or Python. - Ability to research complex technical topics and apply findings to deliver practical, production-ready solutions. - Experience mentoring or teaching others in a technical capacity. - Strong problem-solving instincts and a genuine appetite for hard challenges. - Must be able to obtain and maintain Security Vetting to at least SC level. - Willingness to attend our Shoreditch office at least once a week. What will help you stand out - Experience with systems programming languages like C++ or Rust. - Familiarity with the defence sector, Military Modelling and Simulation, or C2 systems. - An interest in travelling to support customer deployments, hackathons, and industry events - getting your work in front of real users, fast. 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.