Owen Thomas | B Corp™
Senior Python Engineer | Backend, Product Engineering | FastAPI, GraphQL | AI FinTech, Series C | Greenfield Build | London Hybrid | Up to £125k + Equity | Work Abroad 90 Days/Year
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Senior Python Engineer | Backend, Product Engineering | FastAPI, GraphQL | AI FinTech, Series C | Greenfield Build | London Hybrid | Up to £125k + Equity | Work Abroad 90 Days/Year
The Company
We're working with a highly successful, fast-scaling AI FinTech transforming how data and workflows operate across global financial markets.
Their platform is already trusted by 300+ companies worldwide, including global banks, private equity firms, and asset managers.
Following significant growth and Series C funding, they're now heavily investing in new products and international expansion - including a completely greenfield product build requiring a new backend platform from the ground up for a Mobile app build.
The Role
You'll join an experienced engineering organization but work on a greenfield product, taking significant ownership of the backend systems and APIs that power it.
This is a product engineering role, rather than purely backend delivery. You'll work closely with Product, Mobile, AI, and Data teams to understand customer problems and build solutions end-to-end.
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You'll be working across areas including:
- Building backend services primarily with Python / FastAPI
- Designing high-performance APIs and GraphQL services
- Owning systems and features from idea → architecture → production
- Working across complex data, distributed systems, and financial datasets
- Building products that allow customers to make real-time decisions within financial markets
- Helping shape the architecture and technical direction of a completely new product
What We're Looking
- Strong commercial experience building backend systems with Python
- Experience with FastAPI, Django, Flask, or similar
- Strong understanding of API design, GraphQL, and distributed systems
- Experience building complex, data-intensive products
- Comfortable with AWS, Kubernetes, and modern cloud infrastructure
- A genuine product engineering mindset - thinking beyond tickets and understanding the customer problem
- Evidence of owning technically challenging projects end-to-end
- Comfortable operating with ambiguity and making pragmatic engineering decisions
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Experience building BFFs, mobile-facing APIs, or working closely with mobile teams would be beneficial, but isn't essential.
What's On Offer
- Up to £125,000 base salary + equity
- Up to 7% pension
- Private medical insurance
- Hybrid working - 2 days per week in London
- Work abroad for up to 3 months per year
- Greenfield engineering with significant technical and product ownership
If you're a strong Python Backend / Product Engineer who enjoys building new products, owning problems end-to-end, and working in high-performing engineering teams, apply today.
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