Software Engineer, AI Engineer (Applied​/Software), Full Stack Developer

150,London Area Do you have a track record of building exceptional software and want to work on a genuinely ambitious AI product?

Are you excited by high ownership, cutting-edge AI tooling, deep technical challenges, and the opportunity to become a technical leader within a small, elite engineering team?ð Software Engineer – AI x Financial Modelling ðð Salary:
Up to 250k DOE + equityð

Location:

London - onsite 5 days per weekð Will relocate and sponsorð§

Experience:

Exceptional engineers – high agency and strong technical fundamentalsI’m excited to be working with a very ambitious AI startup reinventing how businesses make some of their biggest decisions. They’re starting by building the best AI add-in for complex financial modelling in Excel – essentially Cursor for financial modelling.

Financial models sit underneath huge decisions across M&A, private equity, investment, corporate strategy and consulting, yet the tooling behind them remains incredibly manual and outdated.

They’re building something fundamentally different.

Long-term, their ambition is to create an AI operating system for the entire strategic decision lifecycle – spanning Excel, PowerPoint, email and meetings. They’re tackling a potentially enormous new category at the intersection of AI, software engineering and financial decision-making.

They’re now looking for exceptional Software Engineers to join a small, extremely high-calibre engineering team and help build the product from the ground up.ð¡ You’ll work directly on:

Owning features end-to-end – from Rust services and backend infrastructure through to the frontend

Using the latest AI tools and models to ship high-quality software at exceptional speed

Building and improving AI agents, including their harness, tools and context optimisation

Writing highly performant software – removing allocations, optimising queries and caching aggressively

Owning and improving backend infrastructure and CI pipelines

Debugging low-level issues and continuously optimising system performance

Working closely with design to ensure every feature feels polished, beautiful and consistent

Taking increasing technical ownership as the company and product scale They’re particularly interested in engineers who have:

Evidence of being a top-centile engineer

Exceptional problem-solving ability and strong software engineering fundamentals

High agency, determination and a genuine desire to take ownership

The ability to move quickly, learn new technologies and wear multiple hatsA strong interest in AI and experience using modern AI coding tools effectively

The ability to work across the stack rather than being restricted to one areaA genuine passion for building great products, not simply writing codeð» Tech stack:

Rust (but they are open to any low-level language e.g. C++)Type Script React AI / LLM tooling

Backend infrastructure & Dev Opsð Bonus points for:

Competitive programming experience e.g. Olympiads or Programming Contests Trading or financial technology background AI Tech experience

Experience building AI agentsð What they’re looking for:

High agency – you see a problem and take ownership of solving it Technical excellence – you care about performance, architecture and writing exceptional software AI-native mindset – you understand that AI is now an essential part of the engineering workflow

Speed + quality – you can leverage AI to move incredibly quickly without becoming a “vibe coder”Curiosity – you enjoy getting into unfamiliar areas and figuring things out Product mindset – you care about how the software feels, not just whether it works

Leadership potential – over time, you’ll have the opportunity to own significant parts of the productð Why join?

Join a small, exceptionally strong engineering team with…