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# Fullstack Engineer

- **Company:** La Fosse
- **Location:** London, UK
- **Experience:** Expert
- **Salary:** £80,000.0 - £95,000.0
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Agile Methodology, Artificial Intelligence, Amazon Web Services, Computing Platforms, Software as a Service, Continuous Integration, Database Design, Web Development, Python (Programming Language), PostgreSQL, Machine Learning, Node.Js, Scrum Methodology, Software Product Management, Standard Sql, Next.js, Software Construction, Software Engineering, SQL Databases, TypeScript, ReactJS, System Availability, Large Language Models, Prompt Engineering, Pandas, Infrastructure Automation Frameworks, Functional Programming, Api Design, Serverless Computing, Golang
- **Published:** September 22, 2026
- **Apply:** https://www.lafosse.com/pro-bono/pro-bono-looking-for-an-expert/

## About the Role

* JavaScript
 * Node JS
 * React
 * Typescript, * 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.

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.

## Description

* 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.

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


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