Senior Backend Engineer

👶 ABOUT JUNIOR We're building cutting-edge LLM-powered tools that supercharge investment research for the world's most demanding deal teams. Our clients include several of the top 10 global private equity firms, Big 4 professional services firms, and leading consulting practices: organisations responsible for deploying billions of dollars annually. We're a profitable, bootstrapped company with a growing team of ~28 people based in London and New York. We 10x'd our revenue in 2025 and are on track to grow 2-3x again this year. Junior saves clients an average of 10 hours per week, and we're expanding fast into new verticals including investment banking, hedge funds, and research firms. 💡 ROLE DESCRIPTION As a Backend Engineer, you’ll help build and scale the systems that power our AI-driven research platform. This is a systems-level role - ideal for engineers who love thinking about data flows, orchestration, and performance across complex distributed systems. You'll have the unique opportunity to: - Ship quickly - Architect and scale backend systems that support high-throughput LLM interactions, vector search, and multi-agent orchestration. - Stitch together AI infrastructure across model providers, data stores, and internal APIs to create cohesive, performant systems. - Own reliability and observability, helping us evolve our database (Postgres / ClickHouse) and job orchestration systems. - Prototype new backend capabilities (retrieval pipelines, caching layers, async task queues) that let us build faster and smarter. - Shape our engineering culture 🔥 ABOUT YOU We're looking for product-minded backend engineers who: - Based in NYC, ***we are 5 days a week in person - Are excited by the intersection of AI infrastructure and systems design - Have experience leading projects end-to-end - Are eager to contribute to product decisions - Are proficient in our tech stack: Next.js, TypeScript, PostgreSQL - Feel like you are never building fast enough Bonus points for experience working on: - Retrieval/embeddings/prompt orchestration - Built internal infrastructure / dev tools @ startups 🌵 BENEFITS All the usual benefits (competitive pay and equity, private healthcare etc). Unusual benefits: - Gym membership - In-office cook - Summers working in Greece by the beach 📩 HOW TO APPLY If you're excited about the opportunity to drive innovation at Junior, we'd love to hear from you! Email us at careers@myjunior.ai with your resume and a brief introduction. We can't wait to meet you! 🙌