Product Engineer (£80k-£130k + Equity) at Notion Capital-backed defense tech startup

Product Engineer

Salary: £80k-£130k + Equity

Company Description: Notion Capital-backed defense tech startup building an AI-native OS for military production

Location: London, UK or Remote

Job Description

You will join a high‑calibre team building AlliedOS, the connective platform linking frontlines to factories. As a full‑stack owner, you will develop a homegrown manufacturing execution system and a defense procurement marketplace. You will ship fast, iterate with real‑world military users, and directly shape the product direction of this critical infrastructure.

Why this role is remarkable

• Work on a global mission to strengthen Western democracies by modernizing the defense industrial base with AI‑native technology.
• Join a peer‑based, non‑hierarchical culture founded by a former Royal Marines officer and backed by top‑tier investors like 1991 VC and Notion Capital.
• Extreme autonomy and impact as an early hire, with a meaningful equity stake and the ability to prove solutions in weeks rather than years.

What You Will Do

• Build and maintain end‑to‑end features across web and mobile using a modern stack including React, TypeScript, and TanStack Start.
• Develop AI‑powered features utilizing OpenAI, AI SDK, and Mastra to automate complex defense procurement and production workflows.
• Collaborate directly with commercial and product teams to translate frontline requirements into a high‑performance operating system for government contracts.

The ideal candidate

• 5‑8 years of full‑stack engineering experience with a track record of shipping high‑quality products in fast‑paced, high‑stakes environments.
• Expert‑level proficiency in TypeScript and React, with a strong instinct for performance, security, and exceptional user experience.
• Demonstrated ability to self‑organize and leverage modern AI development tools like Cursor or Copilot to accelerate delivery and solve complex problems.

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