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! 🙌