Software Engineer

Tracelight Ltd.; Cambridge; On-site; GBP 60,000 - 80,000; Full time

Job summary

A fintech startup in Cambridge is looking for a top-tier engineer to join their team. You will leverage AI to enhance code quality while working closely with design and optimization teams. Candidates must demonstrate excellence in programming with tools like TypeScript and Rust, as well as a proactive approach in developing innovative solutions. The position offers a hands-on role in a dynamic environment, focused on developing cutting-edge financial modeling tools.

Qualifications

• You must be exceptional at prompting and have experience with AI tools like Claude Code, Cursor.
• Evidence of being a top centile engineer is required.
• Experience in frontend and backend development is essential.

Responsibilities

• Use AI to deliver high-quality code efficiently.
• Manage features from backend to frontend.
• Enhance the intelligence of AI agents by optimizing harness and tools.
• Fix backend bugs and optimize continuous integration.

Skills

High agency

Determination

Experience with AI models

Proficiency in TypeScript

Experience in Rust

Background in competitive programming

Experience in trading

Familiarity with React

DevOps knowledge

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 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)