Contract Opportunity: Senior Haskell Developer

Global Tier-1 Investment Bank | £800–£1000/day PAYE | London | 12+ Months

Join one of the most prestigious Haskell engineering teams in global finance.

We're partnering with a world-leading investment bank renowned for its sophisticated use of Haskell in production—arguably the most advanced implementation of the language in the banking sector.

We’re seeking a Senior Haskell Developer with 20+ years of professional experience to contribute as an Individual Contributor and technical leader. This is a rare opportunity to work at the heart of a team pushing the boundaries of functional programming in a real-world, high-performance environment.

What You'll Bring:

• Deep expertise building and deploying large-scale Haskell systems
• Experience leading complex technical projects with Haskell components integrated into broader technology stacks
• Ideally, familiarity with the GHC codebase and knowledge of functional language compilation
• Experience working with or maintaining custom compilers is a strong advantage
• Clear and confident communication skills for cross-functional collaboration and mentoring

Our current direction includes a hybrid compiler architecture, leveraging GHC as a frontend to our proprietary language. Financial services experience is not required—we’re focused on pure Haskell excellence.

• Location: London (hybrid options possible)
• Contract Length: 12 months+
• Rate: £800 to £1000/day (PAYE, negotiable)

If you’re passionate about Haskell and ready to make an impact in a technically elite environment, we’d love to hear from you—or from anyone in your network who might be a fit.

Apply now or reach out for a confidential conversation.