Senior Fullstack Engineer

SR2 Clean Energy; Greater London; On-site; GBP 100,000 - GBP 125,000; Full time

Job description

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 doing

• Building and evolving full stack applications used by technical teams, using Django, FastAPI & React
• Creating interfaces that help users understand complex behaviour and data
• Working closely with others to shape how tools should work and feel
• Balancing speed, quality, and adaptability in a fast changing environment
• Taking 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 suits

• Full stack engineers who enjoy building serious internal tools and have 5years+ experience
• Those with experience working with LLM agents or a strong interest in this area
• People comfortable working with evolving requirements
• Engineers who care about good UX without needing to be designers
• Those motivated by the broader implications of AI and its impact

This is a rare opportunity to build meaningful software in a high trust environment, alongside people who care deeply about doing things well.

If you’re looking for a role where you can make tangible impact, work on an interesting product, and be part of an exceptional team, get in touch at .