Lead AI Engineer – In-Office London

Tracelight Ltd.; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Tracelight Ltd. in London is building an Excel AI add‑in for complex financial modelling. Join a small, strong engineering team with TS/Rust, in-person at Hoxton office.

You will ship high‑quality code, improve AI harnesses, and own evaluation pipelines while collaborating with a designer to deliver delightful features. We expect top‑centile engineering ability, high agency, and experience with competitive programming or building agents.

Qualifications

• Evidence you are a top centile engineer – no compromises.
• High agency and determination.
• Background in competitive programming, trading, big tech, building agents, TypeScript, Rust, React, devops.

Responsibilities

• Use AI to ship high-quality code as fast as possible. Leverage the latest tools, models and trends.
• Make our AI agent smarter by improving the harness, tools, and optimising context.
• Own evaluation pipelines, data collection, SFT and RL.
• Work with our designer to ensure that every feature feels beautiful and consistent.

Skills

Top centile engineer

High agency

Competitive programming

Trading background

Tools

TypeScript

Rust

React

DevOps

Claude Code

Cursor

Job description

Tracelight Ltd. in London is building an Excel AI add‑in for complex financial modelling. Join a small, strong engineering team with TS/Rust, in-person at Hoxton office.

You will ship high‑quality code, improve AI harnesses, and own evaluation pipelines while collaborating with a designer to deliver delightful features. We expect top‑centile engineering ability, high agency, and experience with competitive programming or building agents.