Owen Thomas | B Corp™
Staff Backend Engineer - Python, FastAPI | Architecture, Distributed Systems & AI | AI FinTech, Series C | London Hybrid or Remote | Up to £165k + Equity | Work Abroad 90 Days/Year
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Staff Backend Engineer - Python, FastAPI | Architecture, Distributed Systems & AI | AI FinTech, Series C | London Hybrid or Remote | Up to £165k + Equity | Work Abroad 90 Days/Year
The Company
We're working with a highly successful, fast-scaling AI b2b FinTech transforming how data and workflows operate across global financial markets.
Following significant growth and Series C funding, they're now heavily investing in new products and international expansion.
The Role
This is a high-impact Staff Engineer position on the IC track, taking ownership of technical strategy and architecture across a complex, rapidly scaling engineering organisation.
Rather than owning a single product or feature set, you'll operate across multiple engineering teams, helping define the architecture and technical direction that underpins the company's next phase of growth.
You'll remain hands-on when it matters, but your impact will extend far beyond your own code - setting engineering standards, solving complex architectural problems and aligning teams around a clear technical vision.
You'll be working across areas including:
- Designing and evolving large-scale backend and distributed systems
- Defining technical strategy across Platform, AI, Retrieval and shared engineering services
- Designing scalable APIs and shared platform capabilities
- Leading complex, cross-team technical initiatives from design through to production
- Improving reliability, scalability, observability and developer experience
- Working closely with AI and Retrieval teams across search, RAG and data-intensive systems
- Reducing architectural complexity and establishing common engineering patterns
- Contributing hands-on to critical technical work while raising standards through design reviews and mentoring
- Using AI-assisted engineering to improve productivity and accelerate delivery
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What We're Looking For
- Strong experience designing and building large-scale backend systems and distributed architectures
- Excellent systems design skills, with evidence of making significant architectural decisions
- Experience leading technically complex initiatives across multiple engineering teams
- Strong backend programming experience with Python or another modern backend language
- Strong experience with AWS, Kubernetes, APIs and modern cloud infrastructure
- Comfortable influencing engineering strategy without direct authority
- Able to move between high-level technical strategy and hands-on engineering
- Strong communication skills with experience mentoring engineers and raising engineering standards
- Comfortable making pragmatic technical trade-offs in complex, scaling environments
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Experience with AI-powered systems, RAG, search platforms, retrieval systems or vector databases would be particularly valuable.
Experience as a Founding Engineer / CTO, building systems from scratch in an early-stage environment, or modernising complex legacy systems would also be highly relevant.
What's On Offer
- Up to £165,000 base salary + equity
- Pension contribution matched up to 7%
- Private medical insurance
- Flexible hybrid or remote working
- Work abroad for up to 3 months per year
- 25 days' holiday + public holidays
- Professional learning & development budget
- 1-month paid sabbatical after 5 years
- Significant influence over the architecture and technical direction of a rapidly scaling engineering organisation
Staff Backend Engineer - Python, FastAPI | Architecture, Distributed Systems & AI | AI FinTech, Series C | London Hybrid or Remote | Up to £165k + Equity | Work Abroad 90 Days/Year
This is an opportunity for a genuine Staff-level Backend / Platform Engineer who enjoys solving difficult systems problems, influencing architecture across multiple teams and remaining close enough to the code to lead by example.
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