AI Engineer Engineering · Full Time · London

Our mission is to reinvent how businesses make their biggest decisions.

We are starting by building the best Excel AI add-in for complex financial modelling.

Financial models underpin every important decision a company makes. The process of building them today is broken; financial modelling is, by far, the worst-tooled form of programming. Today, Tracelight is Cursor for serious financial modelling in Excel.

Long‑term we will build the AI operating system for the entire strategic decision lifecycle - work that today happens across Excel, PowerPoint, email, and meetings. We believe this new category is one of the most fundamental applications of AI, and a $100bn+ opportunity.

We are a small very strong engineering team, ex Jane Street, Bloomberg, Cambridge, UCL, etc. Tech stack is TypeScript for most things and Rust where it matters. The role is 5 days a week in person in our Hoxton (London) office.

What you will do

• Use AI to ship high‑quality code as fast as possible. Leverage the latest tools, models and trends. AI is no longer optional. You must be amazing at prompting, know different models, and have experience with Claude Code, Cursor, etc. (We are not looking for vibe coders).
• Make our AI agent smarter by improving the harness, tools, and optimising context.
• Own evaluation pipelines, data collection, SFT and RL.
• Work with our incredible designer Joao to ensure that every feature feels beautiful and consistent.
• Over time, become a technical leader and own significant parts of our AI work.

What you will need

Evidence you are a top centile engineer - no compromises on this.

• High agency and determination.
• Any of the following is a plus: background in competitive programming, trading, big tech, building agents, TypeScript, Rust, React, devops