You will lead the development of robust backend systems, integrating cutting-edge AI capabilities into a production environment. This role involves building high-performance APIs and managing scalable data infrastructure while maintaining a product-owner mindset. You will have full ownership of production services, ensuring reliability and performance for a rapidly scaling user base.
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Backend Engineer at fast-growing AI-first SaaS startup
Are you a Python expert ready to build the future of AI-driven software? This well-funded London startup is looking for a Backend Engineer to own production services and integrate advanced LLM agents and vector databases. If you have 4+ years of experience and a product-owner mindset, join a top-tier team where you can drive significant impact on a scaling platform.
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Location
London, United Kingdom
Compensation
Not Disclosed
Company
Confidential company
Role overview
About the company
Fast-growing AI-first SaaS startup
What you will do
- Design, build, and maintain high-performance APIs using Python (FastAPI) and manage scalable data storage with Postgres and Redis.
- Architect and deploy AI-driven features, leveraging vector databases, reranking algorithms, and LLM-based agents to enhance product capabilities.
- Own the end-to-end lifecycle of production services, from initial design through to deployment and monitoring on cloud infrastructure.
Who this is a fit for
- 4+ years of professional experience building production-grade APIs and services with strong proficiency in Python and SQL.
- Proven track record of owning scaling or reliability projects and a proactive mindset toward product ownership and user experience.
- Hands-on experience or a strong desire to work with AI technologies including vector search, LLM orchestration, and event-driven systems.
Why this role is remarkable
- Opportunity to build at the intersection of backend engineering and AI, including agentic workflows and vector databases.
- Join a well-funded team backed by top-tier VCs during a high-growth phase with significant ownership of technical decisions.
- Work in a high-talent density environment that prioritizes engineering excellence, reliability, and shipping high-impact product features quickly.
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.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
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 your profile’s a match and Confidential company wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.