Founding Engineer Infra/Backend - Spur at Spur

Spur lets you test your website with natural language. Our AI agents act like real users—automating end-to-end testing without requiring traditional QA infrastructure. Spur is founded by 2 Yale Alums, and is backed by leading investors like First Round Capital, Neo, Pear VC, Conviction, and YCombinator. We are transforming the testing world, completely re-imagining what testing means from first principles. We're already accelerating engineering teams at some of the fastest-growing companies in the world. Read our Manifesto: https://www.spurtest.com/founders-letter The Role As our founding infra/backend engineer, you’ll architect the backbone of Spur’s core platform—define, build, and scale mission-critical infra powering our web agents. We own our entire stack end-to-end—you’ll orchestrate fleets of browsers and web agents in the cloud and optimize them at massive scale. You’ll work directly with the founders, solving frontier infra problems with real customer impact, and set the gold standard across our stack, from low-level infra to the UX delivered by our agents. What you’ll do Build and scale our core infra to run and launch thousands of browser and web agents every day. Design