{"schemaVersion":"jobsearcher.job.v1","id":"fd2f82b2ce073d4b235fc0e5","url":"https://jobsearcher.com/jobs/fd2f82b2ce073d4b235fc0e5","canonicalUrl":"https://jobsearcher.com/jobs/fd2f82b2ce073d4b235fc0e5","title":"Software Engineer, Agents","description":"About Sim Sim is the open-source platform to build, deploy, and orchestrate AI agents. Over 70,000 developers—from early-stage startups to the U.S. Department of Defense—use Sim to turn ideas into production-grade agentic workflows on a visual, Figma-like canvas. We connect to 1,000+ apps and LLMs, and our Copilot is the state of the art for building workflows with natural language.\r\nOur team We're a team of 5, YC X25, and backed by a $7M Series A led by Standard Capital with participation from Paul Graham, Perplexity, SV Angel, and Y Combinator. We're based in San Francisco and build in-person every day. Our mission is simple: agents will run the world, and Sim is the primary means by which that happens.\r\nAbout The Role\r\nYou'll own end-to-end development of our core agentic workflow engine and Copilot— the AI assistant that helps developers build and debug workflows using natural language, turning high-level intent into executable, reliable agents. This spans our backend (Next.js), orchestration layer, and all integrations with LLMs and external APIs.\r\nCopilot is currently the best-in-class tool for building workflows with natural language. Your job is to keep it there and push it further—making it faster, more reliable, and capable of handling increasingly complex agentic architectures.\r\nThis is a foundational role. You'll set architecture decisions, reliability standards, and coding patterns that define how the core product works. On a team of 5, your work ships to tens of thousands of developers on fast release cycles.\r\nWhat You'll Do\r\nOwn the agentic workflow engine: the runtime that executes multi-step, tool-using agent workflows in production\r\nBuild and evolve Copilot—our natural language interface for creating, editing, and debugging workflows\r\nDesign and maintain integrations with LLM providers (OpenAI, Anthropic, Google, local models via Ollama) and external APIs\r\nArchitect the orchestration layer that turns visual flows into reliable, observable agent executions\r\nSet technical standards for the codebase—reliability, testing, code quality, and architecture patterns\r\nWork across the stack in our Next.js monorepo, shipping to production daily\r\nDebug hard problems at the intersection of LLMs, distributed systems, and developer tooling\r\nWhat We're Looking For\r\nStrong generalist engineer who has shipped complex distributed systems or developer tools to production\r\nDeep experience with TypeScript/JavaScript and Bun; comfort working in a Next.js monorepo\r\nTrack record of owning and operating production systems—you've been paged, you've debugged the weird ones, you've made things reliable\r\nExperience integrating with LLMs or building on top of foundation model APIs\r\nHigh agency and ownership—on a team this small, you define the roadmap as much as you execute it\r\nStrong opinions on architecture, loosely held—you care about building things right but move fast\r\nExperience with AWS infrastructure is a plus\r\nContributions to open-source projects are a plus\r\nWhy Sim\r\nFoundational impact. You're not joining a team—you're building one. Every decision you make shapes the product and the company.\r\nReal users, real scale. 70,000+ developers use Sim today. Your work ships fast and matters immediately.\r\nWorld-class backers. Series A—Standard Capital, Paul Graham, Perplexity, SV Angel, and Y Combinator believe in what we're building.\r\nOpen source at the core. We've been open source from day one and we're proud of it. 26,000+ GitHub stars and growing.\r\nCompetitive salary + meaningful equity. Early team, significant ownership.\r\nFull benefits. Comprehensive health insurance, relocation.\r\nVisa sponsorship available.\r\nJ-18808-Ljbffr","company":"SupportFinity","rawCompany":"supportfinity","city":"Millbrae","state":"CA","isRemote":false,"isActive":true,"createdAt":"2026-06-25T01:21:30.909Z","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":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"}],"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, Agents","description":"About Sim Sim is the open-source platform to build, deploy, and orchestrate AI agents. Over 70,000 developers—from early-stage startups to the U.S. Department of Defense—use Sim to turn ideas into production-grade agentic workflows on a visual, Figma-like canvas. We connect to 1,000+ apps and LLMs, and our Copilot is the state of the art for building workflows with natural language.\r\nOur team We're a team of 5, YC X25, and backed by a $7M Series A led by Standard Capital with participation from Paul Graham, Perplexity, SV Angel, and Y Combinator. We're based in San Francisco and build in-person every day. Our mission is simple: agents will run the world, and Sim is the primary means by which that happens.\r\nAbout The Role\r\nYou'll own end-to-end development of our core agentic workflow engine and Copilot— the AI assistant that helps developers build and debug workflows using natural language, turning high-level intent into executable, reliable agents. This spans our backend (Next.js), orchestration layer, and all integrations with LLMs and external APIs.\r\nCopilot is currently the best-in-class tool for building workflows with natural language. Your job is to keep it there and push it further—making it faster, more reliable, and capable of handling increasingly complex agentic architectures.\r\nThis is a foundational role. You'll set architecture decisions, reliability standards, and coding patterns that define how the core product works. On a team of 5, your work ships to tens of thousands of developers on fast release cycles.\r\nWhat You'll Do\r\nOwn the agentic workflow engine: the runtime that executes multi-step, tool-using agent workflows in production\r\nBuild and evolve Copilot—our natural language interface for creating, editing, and debugging workflows\r\nDesign and maintain integrations with LLM providers (OpenAI, Anthropic, Google, local models via Ollama) and external APIs\r\nArchitect the orchestration layer that turns visual flows into reliable, observable agent executions\r\nSet technical standards for the codebase—reliability, testing, code quality, and architecture patterns\r\nWork across the stack in our Next.js monorepo, shipping to production daily\r\nDebug hard problems at the intersection of LLMs, distributed systems, and developer tooling\r\nWhat We're Looking For\r\nStrong generalist engineer who has shipped complex distributed systems or developer tools to production\r\nDeep experience with TypeScript/JavaScript and Bun; comfort working in a Next.js monorepo\r\nTrack record of owning and operating production systems—you've been paged, you've debugged the weird ones, you've made things reliable\r\nExperience integrating with LLMs or building on top of foundation model APIs\r\nHigh agency and ownership—on a team this small, you define the roadmap as much as you execute it\r\nStrong opinions on architecture, loosely held—you care about building things right but move fast\r\nExperience with AWS infrastructure is a plus\r\nContributions to open-source projects are a plus\r\nWhy Sim\r\nFoundational impact. You're not joining a team—you're building one. Every decision you make shapes the product and the company.\r\nReal users, real scale. 70,000+ developers use Sim today. Your work ships fast and matters immediately.\r\nWorld-class backers. Series A—Standard Capital, Paul Graham, Perplexity, SV Angel, and Y Combinator believe in what we're building.\r\nOpen source at the core. We've been open source from day one and we're proud of it. 26,000+ GitHub stars and growing.\r\nCompetitive salary + meaningful equity. Early team, significant ownership.\r\nFull benefits. Comprehensive health insurance, relocation.\r\nVisa sponsorship available.\r\nJ-18808-Ljbffr","datePosted":"2026-06-25T01:21:30.909Z","dateModified":"2026-06-25T01:21:30.909Z","hiringOrganization":{"@type":"Organization","name":"SupportFinity","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Millbrae","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"fd2f82b2ce073d4b235fc0e5"},"url":"https://jobsearcher.com/jobs/fd2f82b2ce073d4b235fc0e5"}}