As a senior individual contributor within a high-growth fintech, you will lead the development of complex backend services for global financial markets. You will design scalable systems using Python and FastAPI, mentor junior engineers, and deliver high-impact automation tools. This role offers the opportunity to launch new product verticals while maintaining high code quality standards.
Back to all jobs
Talk toJack
London, United KingdomNot Disclosed
Senior Backend Engineer at VC-backed fintech SaaS
Join a high-growth, Series B fintech SaaS in London as a Senior Backend Engineer and build the infrastructure powering global financial markets. You'll lead technical projects, mentor a talented team, and work with a modern Python/FastAPI/AWS stack in a high-autonomy environment. With perks like three months of work-abroad flexibility and equity options, this is a rare opportunity to join a category-defining scaleup at a defining inflection point.
Overview
Role overview
Company
About the company
Series B VC-backed fintech SaaS
Responsibilities
What you will do
- Lead cross-functional projects from proof of concept to production, focusing on APIs and data processing pipelines.
- Architect and maintain backend services using Python, FastAPI, and serverless AWS infrastructure.
- Mentor other developers through code reviews and collaborative research into emerging technologies like AI/ML integration.
Candidate profile
Who this is a fit for
- Proven experience as a Senior Backend Engineer leading system design and scoping within product teams.
- Strong proficiency in Python and modern web frameworks like FastAPI or Flask, including solid SQL knowledge.
- Product-focused mindset with experience delivering scalable Service Oriented Architecture in a startup or scaleup environment.
What makes it remarkable
Why this role is remarkable
- High-autonomy environment where you can lead system design and technical research for new product verticals.
- Backed by top-tier VCs at the Series B stage with exceptional market retention and global expansion.
- Exceptional culture offering three months of annual work-abroad flexibility and a dedicated professional development budget.
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