About the RoleYou'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.
Copilot 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.
This 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.
What You'll Do- Own the agentic workflow engine: the runtime that executes multi-step, tool-using agent workflows in production
- Build and evolve Copilot - our natural language interface for creating, editing, and debugging workflows
- Design and maintain integrations with LLM providers (OpenAI, Anthropic, Google, local models via Ollama) and external APIs
- Architect the orchestration layer that turns visual flows into reliable, observable agent executions
- Set technical standards for the codebase - reliability, testing, code quality, and architecture patterns
- Work across the stack in our Next.js monorepo, shipping to production daily
- Debug hard problems at the intersection of LLMs, distributed systems, and developer tooling
What We're Looking For- Strong generalist engineer who has shipped complex distributed systems or developer tools to production
- Deep experience with TypeScript/JavaScript and Bun; comfort working in a Next.js monorepo
- Track record of owning and operating production systems - you've been paged, you've debugged the weird ones, you've made things reliable
- Experience integrating with LLMs or building on top of foundation model APIs
- High agency and ownership - on a team this small, you define the roadmap as much as you execute it
- Strong opinions on architecture, loosely held - you care about building things right but move fast
- Experience with AWS infrastructure is a plus
- Contributions to open-source projects are a plus
Why Sim- Competitive salary + meaningful equity. Early team, significant ownership.
- Full benefits. Comprehensive health insurance, relocation.
- Visa sponsorship available.
