Full Stack Engineer

Mid-Level Full-Stack Engineer | AI Cybersecurity Startup £120,000 + benefits & equity | London | Hybrid 2–3 days a week The best salary I've seen for a mid-level... If you're a mid-level engineer with around 3–5 years' experience who loves building and wants more ownership, this is somewhere you can scratch that itch. You'll join a small, product-focused engineering team working directly with a technical founder, taking customer problems from idea through to production. No layers of red tape. You'll be trusted to figure things out, build properly and ship, learn and improve quickly. The founder has spent years building this technology himself, and the team has a simple ethos: a rising tide lifts all boats. What are they building? An AI-powered cybersecurity platform helping companies understand how security issues happen across their code, infrastructure and business. They've raised millions in pre-seed funding and are already working with major customers. Tech: Python, React, GraphQL, LLM tooling and modern cloud infrastructure. One day you could be building a customer-facing feature, the next solving a production issue or figuring out what needs to be built from a customer problem. What are they looking for? Around 3–5 years' engineering experience is the sweet spot Strong production PythonGood database, testing and engineering fundamentalsExperience shipping features end-to-endStartup or small product-team experienceComfortable across backend and frontendAble to take a problem and figure things out They use LLMs heavily as development tools, but you still need strong independent engineering judgement. LLMs are used as a pair programmer, not relied on. Cybersecurity isn't required. They'll teach you the domain. React, Airflow, Prefect or security experience is a bonus. Why join? You'll get exposure to customers, product, architecture and production from day one, with genuine ownership and very few blockers. Please apply even if you don't have an up-to-date CV. We can cross that bridge later.