La Fosse
Senior Full Stack Software Engineer
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Senior Full Stack Software Engineer (TypeScript, React, Next.js, AI, AWS)
Up to £95,000 + Equity | London Hybrid
I'm partnered with a high-growth deep-tech scale-up spun out of Imperial College London that's helping accelerate the future of electrification. Backed by leading investors, they've built a battery software platform already used by global automotive, aviation, and industrial customers, with a Series A on the horizon and ambitious growth plans.
They're now looking for a Senior Full Stack Software Engineer to take ownership of their production SaaS platform, build the next generation of AI-powered capabilities, and work directly with the founders to shape both the product and engineering function as the business scales.
The Role
- Own a production, multi-tenant SaaS platform used by enterprise customers.
- Design, build and scale full-stack applications using TypeScript, React, Next.js, Go, Python and AWS.
- Build AI-powered features, LLM integrations, agentic workflows and automation tools.
- Work directly with founders to influence product strategy, engineering direction and future hiring.
- Develop cloud-native systems using AWS Serverless, Lambda, PostgreSQL, Supabase and modern API architectures.
- Improve platform reliability, observability, security, performance and scalability.
- Support CI/CD, Infrastructure as Code and software engineering best practices.
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Tech Stack
TypeScript, React, Next.js, Node.js, Go, Python, AWS, Lambda, PostgreSQL, SQL, Supabase, API Development, AI, Machine Learning, LLMs, OpenAI, Claude, MCP, RAG, Serverless, CI/CD, Infrastructure as Code
What They're Looking For
- Strong commercial experience as a Software Engineer, Full Stack Engineer, Full Stack Developer or Senior Software Engineer.
- Expertise with TypeScript, React, Next.js and modern web application development.
- Experience building and operating cloud platforms using AWS.
- Strong SQL, PostgreSQL and database design experience.
- Demonstrable experience delivering production software products.
- Experience building AI features using LLM APIs, prompt engineering, agentic workflows or AI tooling.
- Comfortable operating in a fast-moving startup or scale-up environment.
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Nice To Have
- Node.js and Go experience.
- Experience with Supabase and Vercel.
- RAG, MCP, AI Agents, Evaluation Frameworks and AI Product Development.
- Python, Pandas and data tooling experience.
- Startup, scale-up or founding engineer experience.
- Interest in ClimateTech, EnergyTech, Scientific Software or Battery Technology.
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