Backend Engineer (Java/kotlin/Go/Python)

Build like a founder. Ship like Spartan. Our customers are scaling fast — and so are we. That’s why we’re looking for a Backend Engineer to join our world-class team.At Spartan, we don’t act like vendors. We embed with startups backed by YC, Pear VC, BlingCap ,a16z, Techstars, and more — partnering with founders and engineers from Stanford, MIT, Yale, Google, Amazon, Uber, and beyond. Together, we help launch MVPs in 30 days and scale systems that power billions of requests.This isn’t “just another backend role.” It’s a chance to work shoulder-to-shoulder with elite builders, solve complex startup challenges, and see your code directly drive companies raising millions on the global stage.You’ll also be working at the frontier of AI: 70% of our portfolio today is LLM-powered. Our engineers leverage the latest tools like Cursor, Claude, and Codex to move faster, write cleaner code, and solve harder problems. What You’ll DoDesign and build scalable micro-services that power high-growth startups.Ship fast with a proven process: async standups, PRDs/RFCs, code reviews, automation.Work in an AI-native workflow — leveraging tools like Cursor, Claude, and Codex to speed up development, reduce boilerplate, and focus on solving core startup problems.Uphold engineering excellence — clean code, testing, documentation, reliability.Collaborate directly with US startup founders and product leaders — shaping solutions that drive their business forward.Help shape Spartan’s engineering culture — we’re 1% pass-rate engineers who work like founders, not contractors.