Principal Python Engineer (capital markets)

Principal Python Engineer, London, Europe's Largest Equities Exchange

We are working exclusively with one of the world's largest exchange operators on a Principal Python Engineer hire in London. This is a senior individual contributor role within a small, highly skilled engineering team building and expanding the data pipeline and event streaming infrastructure that powers the largest equities exchange in Europe.

The Role

You will lead complex engineering projects end to end, working closely with business development and sales teams to deliver new products and features, and mentoring engineers across Europe and the US. The team takes software craftsmanship seriously — testable, maintainable code, pair programming and TDD are core to how they work.

Expert Python, advanced SQL, deep Linux knowledge

Django, Flask or FastAPI

Java familiarity a plus

What They Are Looking For

Principal or Staff level Python engineer with strong leadership skills

Degree in Computer Science or related field preferred

Financial markets experience a strong plus — market data, order management, algorithmic trading or financial systems integration

Someone who takes genuine pride in code quality and engineering standards

The Package

Competitive salary and incentive compensation

25 days holiday rising to 30, complimentary lunch daily

4 days in office, London

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