Senior Full Stack Engineer

👶 ABOUT JUNIOR Junior is building the AI operating system for investment research. Our software helps private equity firms, consultants and financial institutions complete high-stakes research workflows dramatically faster - from diligence and memo writing to market mapping, research synthesis and strategic analysis. We’re trusted by several of the world’s top private equity firms, Big Four consultancies and leading financial institutions. - Bootstrapped and profitable - ~£20M+ in revenue, after growing 10x last year - 60+ people across the company - 20-person engineering team, doubling to 40 this year - Core stack: TypeScript, Next.js and PostgreSQL You’d be joining early enough to shape the product, engineering culture and company, but with enough traction that everything you build lands immediately in front of demanding, paying customers. 💡 THE ROLE You’ll own features end to end - across the frontend, backend and data layer - and ship on a weekly cadence, not a quarterly one. You’ll: - Ship quickly, then ship again - Design and build entirely new ways of working with computers - Work on groundbreaking projects involving LLMs - Speak directly with the clients using what you build - Use those conversations to shape product decisions - Help define Junior’s engineering culture as the team doubles 🔧 SAMPLE PROJECTS - Build frontier products capable of ingesting new types of research inputs - Build an extremely low-latency, voice-to-voice survey tool that autonomously conducts high volumes of research - Build a mobile app from scratch in three weeks - Create segmented knowledge graphs using unstructured-to-structured data transformations - Build an AI-native CRM with deep links into that knowledge graph 🔥 ABOUT YOU - You have 5+ years of engineering experience - we care about demonstrated competence, not pedigree - You’re genuinely strong in TypeScript, Next.js and PostgreSQL, not merely familiar with them - You can build a polished React/Next.js interface or work