Senior Backend Engineer 👶 About JuniorWe'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 DescriptionAs 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 quicklyArchitect 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 YouWe're looking for product-minded backend engineers who:Based in NYC, ***we are 5 days a week in personAre excited by the intersection of AI infrastructure and systems designHave experience leading projects end-to-endAre eager to contribute to product decisionsAre proficient in our tech stack: Next.js, TypeScript, PostgreSQLFeel like you are never building fast enoughBonus points for experience working on:Retrieval/embeddings/prompt orchestrationBuilt internal infrastructure / dev tools @ startups🌵 BenefitsAll the usual benefits (competitive pay and equity, private healthcare etc). Unusual benefits:Gym membershipIn-office cookSummers working in Greece by the beach📩 How to ApplyIf 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! 🙌