Senior Full-stack Engineer (React + Python)

Full-stack Engineer (React + Python)

Who We Are

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OpenMinds is a defence technology company operating at the frontier of cognitive defence and strategic intelligence. Founded in Ukraine at the outset of Russia's full-scale invasion, born out of urgency and battlefield experience, we've since scaled to the UK and globally, while still staying close to the operational reality of the fight we're built for.

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We deliver end-to-end capability across information environment assessment, audience research, synthetic testing, operational simulation, and campaign dissemination. We support 5 NATO-member state governments and 20+ defence primes worldwide.

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Our platforms were developed and validated under active warfare conditions across 600+ missions. In June 2026, OpenMinds placed 2nd of 93 companies in the NATO Innovation Challenge on Cognitive Warfare.

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Join us to help democracies build resilience in the new arms race for cognitive warfare, and shape the future of defence with real-world impact.

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Who we’re looking for

We’re looking for a Full-stack Engineer (React + Python) to focus on a few products across message delivery, audience simulation, analytics, and data collection. You’ll deliver backend services, UI interfaces, and data pipelines. We work AI-first, so you’ll use coding agents daily and build LLM capability into the products themselves.
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In this position, you will:

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— Build features across our products, covering backend, frontend, and infrastructure.

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— Pick up unfamiliar codebases and domains quickly, using AI to close the gap.

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— Ship LLM features into the products: retrieval, agents, tool calling, and structured outputs.

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— Build evaluation sets that show whether each change is an improvement.

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— Use Claude Code and other coding agents daily, staying accountable for everything you merge.

— Add guardrails against prompt injection, unsafe tool use, and data leakage.

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— Run what you build: latency, cost per request, tracing, and alerting.

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— Maintain secure GCP infrastructure and keep services deployable on-premise.

We are a perfect match if you:
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— 5+ years of hands-on full-stack development with ReactJS (TypeScript) and FastAPI/Flask (Python).

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— Strong grasp of OOP, design patterns, RESTful APIs, database design, and cloud infrastructure (GCP is preferred).

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— Experience in DevOps (Docker/k8s, IaC, CI/CD).

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— Daily use of coding agents (Claude Code, Codex).

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— Experience building eval sets and measuring whether a change improved anything.

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— A track record of picking up an unfamiliar domain or stack and shipping in it.

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— English B2+.

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— Nice to have: LLM features shipped to production - retrieval, agents, tool calling, structured outputs, and guardrails

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We offer:

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— A work culture that values focus, elegance, speed and experimentation, with deep roots in the philosophy of play (Huizinga, Hesse).

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— The chance to work on some of the most exciting and hardest problems in information operations and cognitive warfare, alongside a team and partner network operating at the frontier of the field.

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— A genuine role in shaping the industry: OpenMinds contributes to emerging doctrine and policy, publishes frontier research, and speaks at leading conferences.

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— HQs in London and Kyiv, and presence in key democratic capitals.

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— Unlimited vacation and leave policies.