As a Senior Backend Engineer at Myjunior.ai, you will architect and scale systems supporting high-throughput LLM interactions, vector search, and multi-agent orchestration. You will design data pipelines and internal infrastructure that powers investment research for the world’s leading firms, taking high ownership of projects from architecture through to production.
Senior Backend Engineer at Myjunior
Myjunior.ai is redefining investment research for the world's elite private equity firms and consulting giants. Having 10x'd revenue in 2025 while remaining fully bootstrapped and profitable, they are now looking for a Senior Backend Engineer to join their London team. In this high-ownership role, you'll architect the systems powering high-throughput LLM interactions and multi-agent orchestration. You will work directly with the CTO, enjoy premium perks like Third Space memberships and international offsites, and help scale a product already powering hundreds of billions in annual investments.
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Location
London, United Kingdom
Compensation
£100k-140k + Equity
Company
Myjunior
Role overview
Myjunior.ai is a profitable, bootstrapped London startup building LLM-powered workflow tools that supercharge investment research for global top 10 private equity and consulting firms.
What you will do
- Architect and scale backend systems for high-throughput LLM orchestration, vector search, and complex multi-agent workflows.
- Design and own internal data platforms that consolidate product usage, CRM data, and financial systems to drive business intelligence.
- Stitch together AI infrastructure across model providers and data stores to create performant, retrieval-heavy research pipelines and internal automation.
Who this is a fit for
- Has 4+ years of professional experience building and scaling distributed backend systems using Python or TypeScript and PostgreSQL.
- Demonstrates a proven track record of owning technical projects end-to-end, translating complex business problems into clean, reliable production code.
- Thrives in a fast-paced startup environment and is excited to work in-person at the Farringdon office alongside a high-caliber engineering team.
Why this role is remarkable
- Join a hyper-growth team that 10x’d revenue in 2025 while remaining fully bootstrapped and profitable, working directly with the CTO/co-founder.
- Build the core infrastructure powering hundreds of billions in annual investment for the world’s most prestigious private equity mega-funds and MBB firms.
- Enjoy first-class perks including Third Space memberships, daily office meals, and regular all-expense-paid international offsites to locations like Crete, Cancun, and Barcelona.
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.
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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 Myjunior wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.