Join a high-performance engineering team as a founding-level hire building high-throughput financial infrastructure. You will architect scalable systems for real-time data streaming and trade execution, working directly with a veteran leadership team. This role offers significant technical ownership as you scale critical backend services to support a rapidly expanding user base in the UK market.
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London, United Kingdom£85K - £115K + Equity
Senior Software Engineer at Fast-growing London fintech
Are you a Senior Backend Engineer looking for a high-impact role at a well-funded fintech? Join a veteran founding team in London as their 5th engineer to build scalable, high-throughput trading infrastructure from the ground up. You will tackle fascinating technical challenges like real-time data streaming and event-driven architecture while enjoying significant equity and a clear path to leadership. If you thrive in fast-paced environments and love solving complex distributed systems problems, this is your chance to help build a generational financial platform in the UK. This hybrid role offers direct influence on product direction and a collaborative, whiteboard-heavy culture in the heart of London.
Overview
Role overview
Company
About the company
Fast-growing London fintech
Responsibilities
What you will do
- Design and maintain robust, scalable systems for critical financial services using a modern, multi-language stack.
- Build high-performance connectivity and event-driven architectures to handle thousands of concurrent traders and real-time data.
- Mentor other engineers and foster a high-standard engineering culture through pragmatic software development and feedback.
Candidate profile
Who this is a fit for
- At least six years of commercial experience building and maintaining high-volume, critical backend systems.
- Strong proficiency in languages such as Java, Python, or Go, with deep knowledge of distributed systems.
- Proven ability to work in a fast-paced startup environment and a commitment to on-call support for production reliability.
What makes it remarkable
Why this role is remarkable
- Significant technical ownership over architecture and greenfield infrastructure projects for a high-volume platform.
- Backed by top-tier VCs and a record-breaking community funding round, ensuring strong market validation.
- Direct collaboration with an experienced founding team consisting of former tier-one banking and successful fintech scale-up leaders.
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