Founding Software Engineer

Founding Software Engineer

HartleyCo | Greater London, ENG, GB

Posted 17 days ago

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Description

London preferred, open to strong candidates across the UK

We're working with an early-stage fintech startup building a next-generation platform for professional investors, covering portfolio risk analytics, scenario modelling, and an AI-driven research layer that sits on top of a genuinely massive financial dataset. The company is already live with paying fund clients and closing in on a seed round.

They're hiring two Founding Engineers to join at the ground floor. This isn't a "join a team" role, it's ownership of entire systems: from the underlying math and data pipelines through to the APIs and the interfaces that traders and analysts actually use.

What you'll be doing

  • Building and owning risk models, backtesting infrastructure, and scenario/stress-testing tools
  • Working with large-scale, point-in-time financial datasets at serious volume
  • Shaping the data and strategy layer that powers an AI research assistant for professional investors
  • Making real architectural calls in a small, fast-moving team

What we're looking for

  • Strong Python and production-grade data engineering experience
  • C++ or Rust is a bonus, not a requirement
  • Background in a fund, bank or risk environment (or comparable exposure to serious financial datasets)
  • A working understanding of portfolio risk, backtesting, or systematic strategy concepts, gained through real projects rather than just interest
  • C++ or Rust is a bonus, not a requirement
  • Exceptional recent graduates with strong relevant internships (e.g. at top quant funds) will also be considered
  • Comfortable with ambiguity and genuine ownership in an early-stage environment

Process:

Python-based technical exercise focused on working with large datasets, followed by a conversation with the founders.

Get in touch if this sounds like you, or if you know someone who fits.

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