About Vast.ai Vast.ai democratizes and decentralizes AI by running the world’s largest peer-to-peer GPU marketplace. Our platform already powers thousands of training runs and production workloads at a fraction of hyperscaler prices. We’re a fast-growing startup based in Los Angeles and San Francisco, on a mission to organize, optimize, and orient the world’s computation. About the Role We’re hiring a QA Engineer to drive both manual and automated testing across our web applications and backend services in a Linux-first environment. This role is central to shipping reliable, high-performance software for a complex, always-on platform. You’ll work closely with Product and Engineering to define quality standards, catch issues early, and help deliver confident releases. This role is onsite 5 days a week in our Los Angeles (Westwood) office. What You'll Do - Execute manual, exploratory, and regression testing for web apps and backend services - Maintain and expand test plans for existing and upcoming features - Design high-signal test cases and build/extend automation where it matters most - Validate requirements and ensure releases are stable and defect-free - Investigate failures, identify root causes, and file clear, actionable tickets - Partner with Product and Engineering on acceptance criteria and release readiness Minimum Qualifications - 3+ years hands-on testing of web applications - Strong knowledge of test methodologies and their corresponding tools - Experience with writing test plans and test cases for assigned features - Experience with test automation - Keen eye for detail Nice to Have - Passionate about the future of AI - API testing with Postman/Newman or similar - Proficient with Linux - Experience with load testing tools Benefits - Work 5 days a week from the Vast.ai HQ in Los Angeles (Westwood) in an ambitious, fast-paced, AI-centered startup environment - Health, dental, vision and life insurance coverage - Matching 401K - Pay: $40.00 / hour