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...