Senior Backend Engineer

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Senior Backend Engineer Salary Not Disclosed Company Description VC-backed AI fintech startup Job Description You will lead the development of high-performance backend systems for an AI-native platform serving major financial institutions. By building scalable infrastructure and sophisticated agentic workflows, you will enable complex data processing and investment intelligence at scale. This role offers end-to-end ownership in a high-growth environment focused on transforming global finance operations. Location London, UK Why this role is remarkable Join a well-funded Series A startup that has achieved massive revenue growth and established strong product-market fit with top-tier global firms.Own the core infrastructure of an AI-first platform, making critical architectural decisions and driving technical strategy for a rapidly scaling engineering team.Work alongside experienced startup veterans to build the next generation of intelligent tools for a massive, multi-trillion-dollar financial sector. What You Will Do Design and implement scalable backend services using Python and modern web frameworks to support complex, long-running AI workflows.Build and maintain distributed data pipelines and search infrastructure to handle large-scale document processing and real-time data extraction.Collaborate with product and AI teams to integrate large language models into core platform features for production-grade reliability and performance. The ideal candidate Has 5+ years of experience building and operating production-grade backend systems at a venture-backed startup or top-tier technology company.Demonstrates deep expertise in Python, distributed systems, and modern database technologies like Postgres or various messaging queues.Thrives in high-autonomy environments and has a proven track record of taking complex features from initial design to production. Who are Jack & Jill? 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. 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. 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. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.