Senior Full Stack Engineer London 100k to 150k React Django FastAPI This role is for Engineers who are intellectual and driven by deep complexity. This is about building tools that help people make sense of exceptionally complex systems. You will work on internal software used to explore, analyse, and interact with advanced AI models. These tools are designed for technical users and require thoughtful engineering across both backend and frontend. The use case of this software is about tackling some of the most pressing challenges of the next generation. If you enjoy owning problems end to end and care about both functionality and usability, this role offers real depth and the opportunity to be part of a mission driven team who are as competent as they are ambitious. What you will be doingBuilding and evolving full stack applications used by technical teams, using Django, FastAPI and ReactCreating interfaces that help users understand complex behaviour and dataWorking closely with others to shape how tools should work and feelBalancing speed, quality, and adaptability in a fast changing environmentTaking responsibility for features from idea through to real world use The stack centres on Python and modern frontend technologies, but curiosity and good judgement matter more than ticking boxes. Who this suitsFull stack engineers who enjoy building serious internal tools and have 5years+ experienceThose with experience working with LLM agents or a strong interest in this ..... full job details .....