{"schemaVersion":"jobsearcher.job.v1","id":"f14fdaafde37d94b23e85b09","url":"https://jobsearcher.com/jobs/f14fdaafde37d94b23e85b09","canonicalUrl":"https://jobsearcher.com/jobs/f14fdaafde37d94b23e85b09","title":"RL Engineer","description":"About This OpportunityAbout EthosWe're building AI to make humans irreplaceable. Ethos is the platform that matches human expertise to paid opportunities, from AI model training to advisory roles and full-time positions, backed by a16z, General Catalyst and other top investors.What You'll Work OnDesigning and building RL environments and data generation pipelines that feed into post-training workflowsAgentic infrastructure that sources, screens, and routes domain experts at scaleEvaluation frameworks to close the loop between data quality and model performanceThis is an early-stage role with meaningful equity. If you've built things that matter at companies that didn't have all the answers, we'd love to talk.Key RequirementsHands-on experience building RL environments or generating data for post-training (RLHF, RLAIF, preference data, evals) — this is central to the roleStartup experience — you've shipped in resource-constrained environments and taken real ownershipStrong background building AI/agentic applications (LLM pipelines, tool use, evals)Generalist instincts - you'd rather solve the problem than protect your laneComfortable across the stack: backend, infra, and ML tooling","company":"Ethos","rawCompany":"ethos","city":"Millbrae","state":"CA","isRemote":false,"isActive":false,"createdAt":"2026-07-23T12:52:32.869Z","occupations":[{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1221.00","title":"Computer and Information Research Scientists","slug":"computer-and-information-research-scientists"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"RL Engineer","description":"About This OpportunityAbout EthosWe're building AI to make humans irreplaceable. Ethos is the platform that matches human expertise to paid opportunities, from AI model training to advisory roles and full-time positions, backed by a16z, General Catalyst and other top investors.What You'll Work OnDesigning and building RL environments and data generation pipelines that feed into post-training workflowsAgentic infrastructure that sources, screens, and routes domain experts at scaleEvaluation frameworks to close the loop between data quality and model performanceThis is an early-stage role with meaningful equity. If you've built things that matter at companies that didn't have all the answers, we'd love to talk.Key RequirementsHands-on experience building RL environments or generating data for post-training (RLHF, RLAIF, preference data, evals) — this is central to the roleStartup experience — you've shipped in resource-constrained environments and taken real ownershipStrong background building AI/agentic applications (LLM pipelines, tool use, evals)Generalist instincts - you'd rather solve the problem than protect your laneComfortable across the stack: backend, infra, and ML tooling","datePosted":"2026-07-23T12:52:32.869Z","dateModified":"2026-07-23T12:52:32.869Z","hiringOrganization":{"@type":"Organization","name":"Ethos","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Millbrae","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"f14fdaafde37d94b23e85b09"},"url":"https://jobsearcher.com/jobs/f14fdaafde37d94b23e85b09"}}