Senior Software Engineer

Software Engineer - AI/TypeScript/Rust

Location: Hoxton, London - five days per week in the office.

We’re partnering with an AI startup building software to help businesses make better financial and strategic decisions. Their first product brings AI agents into Excel, helping users build and work with complex financial models.

They’re looking for a Software Engineer to take ownership of features across the product, working within a small, highly technical team. The stack is primarily TypeScript, with Rust used for performance-critical components.

What you’ll be doing

• Own features end-to-end, spanning Rust services, backend systems, and frontend interfaces.
• Use AI development tools such as Claude Code and Cursor to deliver high-quality software quickly.
• Improve the AI agent’s tools, execution framework, and use of context.
• Optimise performance across services, database queries, caching, and memory usage.
• Improve backend infrastructure and CI, investigating and resolving low-level bugs.
• Work closely with design to build polished, consistent user experiences, taking increasing ownership of the product.

What we’re looking for

• Evidence of exceptional engineering ability through your work, projects, or technical achievements.
• Strong ownership, initiative, and determination to solve difficult problems.
• Confidence working across the stack and learning unfamiliar technologies quickly.
• Practical experience with AI coding tools, strong prompting skills, and an understanding of different models.
• Sound engineering judgement and the ability to review, test, and take responsibility for the code you ship.

Experience that would stand out

• TypeScript, Rust, React, or DevOps.
• Building AI agents and the tools and systems around them.
• Performance optimisation and debugging complex software.
• Competitive programming, trading technology, or engineering experience in big tech.

This is an opportunity to shape an early-stage AI product, work closely with a strong engineering team, and grow into technical leadership as the company develops.

• Evidence of exceptional engineering ability through your work, projects, or technical achievements.
• Strong ownership, initiative, and determination to solve difficult problems.
• Confidence working across the stack and learning unfamiliar technologies quickly.
• Practical experience with AI coding tools, strong prompting skills, and an understanding of different models.
• Sound engineering judgement and the ability to review, test, and take responsibility for the code you ship.

Experience that would stand out

• TypeScript, Rust, React, or DevOps.
• Building AI agents and the tools and systems around them.
• Performance optimisation and debugging complex software.
• Competitive programming, trading technology, or engineering experience in big tech.

This is an opportunity to shape an early-stage AI product, work closely with a strong engineering team, and grow into technical leadership as the company develops.