Software Engineer

Tracelight Ltd.; Cambridge; On-site; GBP 80,000 - 100,000; Full time

Job summary

A forward-thinking tech startup in Cambridge seeks a talented engineer to use AI for developing high-quality financial models. This role requires expertise in TypeScript and Rust, and a hands-on approach to coding. You'll be responsible for owning features end-to-end and enhancing our AI systems. Ideal candidates should demonstrate strong engineering capabilities, determination, and an interest in competitive programming. This full-time role requires in-person work at our Hoxton office, with an opportunity to become a technical leader over time.

Qualifications

• Evidence that you are a top centile engineer.
• High agency and determination.
• Background in competitive programming or trading is a plus.

Responsibilities

• Use AI to aggressively ship high-quality code.
• Own features end-to-end, from Rust service to frontend.
• Make our AI agent smarter by improving tools and optimising context.

Skills

AI prompting

TypeScript

Rust

React

DevOps

Job description

We aim to turn our users into superhuman financial modellers.

Financial models underpin every important decision a company makes. The process of building them hasn't changed in 20 years. We think there is a $100bn+ opportunity to fix that and deliver productivity gains comparable to those that software engineers are experiencing from AI.

We are a small cracked engineering team, ex Jane Street, Bloomberg, Cambridge, UCL, etc. Tech stack is TypeScript for most things and Rust where it matters. The role is 5-6 days a week in person in our Hoxton (London) office.

What you will do

Use AI to aggressively ship high-quality code. 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).

Own features end-to-end - from a Rust service to backend to frontend. Wear multiple hats and learn quickly.

Make our AI agent smarter by improving the harness, tools, and optimising context.

Own and improve our backend and infrastructure, fix low-level bugs, and optimise CI.

Work with our cracked designer Joao to ensure that every feature feels incredible and consistent.

Over time, become a technical leader and own significant parts of the product.

What you will need

Evidence that you are a top centile engineer

High agency and determination

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

To apply, click the link below and send us an email with your CV and a three bullet point summary of your strongest relevant work. The process is:

Technical interview or take home test

Culture fit interview with CEO

One day of working together on-site (paid)