Join a high-growth fintech startup as a Backend Engineer focused on building and scaling robust APIs and production services. You will work within a hybrid London team, utilizing Python and FastAPI to deliver high-performance systems. This role offers the opportunity to own significant features, optimize SQL performance, and drive reliability across a modern cloud-native stack.
Back to all jobs
Find a job withJack
This job is no longer actively hiring. Open Roles to see active jobs.
London, United KingdomNot Disclosed
Backend Engineer at well-funded fintech SaaS
Are you a Python expert looking to own scaling projects at a high-growth fintech? We are looking for a Backend Engineer in London to build high-performance APIs using FastAPI and Postgres. This is a chance to join a well-funded team where you will take direct ownership of production services and drive technical reliability in a fast-paced environment. If you thrive on solving complex engineering challenges and want to see your work impact thousands of users, this hybrid role is for you.
Overview
Role overview
Company
About the company
Well-funded fintech SaaS
Responsibilities
What you will do
- Design, develop, and maintain high-performance APIs using Python (FastAPI), Postgres, and Redis.
- Own the end-to-end lifecycle of production services, ensuring high availability and system reliability.
- Optimize complex SQL queries and database schemas to support rapidly growing data volumes.
Candidate profile
Who this is a fit for
- Has 4+ years of professional experience building and maintaining production-grade APIs.
- Demonstrates mastery of Python and deep proficiency with relational databases and SQL optimization.
- Proven track record of taking ownership over technical projects involving system scaling or performance tuning.
What makes it remarkable
Why this role is remarkable
- Work at the intersection of finance and technology within a well-funded startup backed by top-tier VCs.
- Take deep ownership of production services and scaling projects that directly impact the product roadmap.
- Collaborate in a high-talent environment with a flexible hybrid model that balances focus with team connection.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 14 million jobs daily and introduces you directly to hiring managers.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
Jack