Founding Software Engineer - Fintech Risk & Data Platform

HartleyCo; Greater London; On-site; GBP 90,000 - 150,000; Full time

Job summary

HartleyCo is seeking Founding Engineers to own entire systems for a fintech platform serving professional investors. You will own risk models, data pipelines, APIs, and interfaces used by traders and analysts.

The role emphasizes ownership in a small, fast-moving team with challenges spanning math, data engineering, and architecture in a startup environment. London preferred, with capability to hire across the UK and scale the platform.

Qualifications

• Strong Python and production-grade data engineering experience.
• 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.
• Exceptional recent graduates with strong relevant internships (e.g. at top quant funds) will also be considered.

Responsibilities

• Build and own risk models, backtesting infrastructure, and scenario/stress-testing tools.
• Work with large-scale, point-in-time financial datasets at high volume.
• Shape the data and strategy layer that powers an AI research assistant for professional investors.
• Make real architectural calls in a small, fast-moving team.

Skills

Python

Data engineering

C++ or Rust (bonus)

Tools

Big data tooling

Backtesting frameworks

Job description

HartleyCo is seeking Founding Engineers to own entire systems for a fintech platform serving professional investors. You will own risk models, data pipelines, APIs, and interfaces used by traders and analysts.

The role emphasizes ownership in a small, fast-moving team with challenges spanning math, data engineering, and architecture in a startup environment. London preferred, with capability to hire across the UK and scale the platform.