Role : Founding Product Engineer (full stack) Location : London (onsite) Salary : up to £110k equity Summary Interested in joining the founding team of an AI start-up? Our client is a VC-backed AI start-up, redefining how accounting is done. Their mission is to automate the most tedious and time-consuming aspects of accounting, from bookkeeping to month-end close, using technologies like multimodal AI, agentic workflows, and embeddings. They are now looking for an experienced product-focused full stack engineer to join the co-founders in London. Backed by top-tier investors and world-class angel investors, this is the perfect opportunity to join the team as one of the first engineers, helping define both product direction and company culture. As the Founding Product Engineer you will: Define the future of the tech, product, and culture, playing a pivotal role. Collaborate closely with the founders to prioritize, drive, and own projects from idea through to delivery. Refine tech choices, experiment with new tools, and select the best ones for each job. Work with AI daily, from AI-powered code editors and prompt engineering to building agent pipelines and evaluation systems. Technologies: TypeScript, React, GraphQL, Temporal, AWS and Datadog. We’re looking for: Mid-Senior level engineer with experience working across the full-stack Experienced working in a highly ambiguous early-stage startup environment Quick learner and passionate about working with new technologies in new domains Product-minded and love delivering value to customers Pragmatic, enjoy fast-paced environment and bias towards shipping quickly Thrives in highly autonomous environments and likes to own projects end-to-end Passionate about modern AI (multi-modal foundational models, agentic workflows, embeddings, self-reflection) If you're excited to join a founding team building an AI product set to redefine an industry, apply now