{"schemaVersion":"jobsearcher.job.v1","id":"4368132cb82f057e4d78ef21","url":"https://jobsearcher.com/jobs/4368132cb82f057e4d78ef21","canonicalUrl":"https://jobsearcher.com/jobs/4368132cb82f057e4d78ef21","title":"Software Engineer, Agent Harness","description":"EngRadar / SimSoftware Engineer, Agent HarnessSimSim is building a visual, drag-and-drop platform for developers to create and deploy AI agents, backed by Y Combinator and a $7M Series A.San Francisco Full-time Posted today aidevtools$210k–$260k Apply directly →Our mission is to automate knowledge work. The first step in our journey is to build the best tool for teams to build agents.Sim is talent-dense. We're looking for special people who are mission-driven, passionate, and creative.About The RoleThe agent harness is Sim. It's the agent that builds workflows, tables, creates knowledge bases, and does everyday tasks. As a member of this team, you'll build the agent that builds everything else: how it plans, calls tools, uses memory, recovers from failure, and runs reliably at scale for 100,000+ builders.You may be a fit if You can think clearly about LLM behavior (tool calls, context, retries, evals) and you can turn that intuition into robust infrastructure.Compensation$210K–$260K base plus 0.2%–0.8% equity.ApplyingIf there appears to be a fit, we'll reach out to schedule 1-2 short technicals. After, we'll schedule an onsite in our office, where you'll work on a small project, discuss ideas, and meet the team.Equal OpportunitySim is committed to creating an inclusive environment for all employees. We celebrate diversity and are committed to creating an inclusive environment for all team members. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.Posted by Sim on their own careers page — you apply directly, no recruiter in between. View original / apply →More at SimSFounding GTM EngineerSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$120k–$200k 5mo agoSDesign EngineerSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$210k–$260k 2mo agoSFounding Account ExecutiveSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$150k–$180k todaySSoftware Engineer, ProductSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$210k–$260k today$210k–$260kdisclosed by employer Apply directly → Browse Full-Stack Jobs","company":"Engradar","rawCompany":"engradar","city":"Millbrae","state":"CA","isRemote":false,"isActive":false,"createdAt":"2026-08-27T09:55:50.517Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1299.00","title":"Computer Occupations, All Other","slug":"computer-occupations-all-other"}],"industries":[{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Software Engineer, Agent Harness","description":"EngRadar / SimSoftware Engineer, Agent HarnessSimSim is building a visual, drag-and-drop platform for developers to create and deploy AI agents, backed by Y Combinator and a $7M Series A.San Francisco Full-time Posted today aidevtools$210k–$260k Apply directly →Our mission is to automate knowledge work. The first step in our journey is to build the best tool for teams to build agents.Sim is talent-dense. We're looking for special people who are mission-driven, passionate, and creative.About The RoleThe agent harness is Sim. It's the agent that builds workflows, tables, creates knowledge bases, and does everyday tasks. As a member of this team, you'll build the agent that builds everything else: how it plans, calls tools, uses memory, recovers from failure, and runs reliably at scale for 100,000+ builders.You may be a fit if You can think clearly about LLM behavior (tool calls, context, retries, evals) and you can turn that intuition into robust infrastructure.Compensation$210K–$260K base plus 0.2%–0.8% equity.ApplyingIf there appears to be a fit, we'll reach out to schedule 1-2 short technicals. After, we'll schedule an onsite in our office, where you'll work on a small project, discuss ideas, and meet the team.Equal OpportunitySim is committed to creating an inclusive environment for all employees. We celebrate diversity and are committed to creating an inclusive environment for all team members. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.Posted by Sim on their own careers page — you apply directly, no recruiter in between. View original / apply →More at SimSFounding GTM EngineerSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$120k–$200k 5mo agoSDesign EngineerSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$210k–$260k 2mo agoSFounding Account ExecutiveSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$150k–$180k todaySSoftware Engineer, ProductSim Sim is building a visual, drag-and-drop platform for developers …San Francisco aidevtools$210k–$260k today$210k–$260kdisclosed by employer Apply directly → Browse Full-Stack Jobs","datePosted":"2026-08-27T09:55:50.517Z","dateModified":"2026-08-27T09:55:50.517Z","hiringOrganization":{"@type":"Organization","name":"Engradar","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Millbrae","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"4368132cb82f057e4d78ef21"},"url":"https://jobsearcher.com/jobs/4368132cb82f057e4d78ef21"}}