# Software Engineer, Agents

**Company:** [Sim](https://hotfix.jobs/companies/sim)
**Location:** San Francisco, CA
**Role:** Backend Engineering
**Salary:** $140k – $220k/yr
**Skills:** TypeScript, JavaScript, Next.js, Bun, LLMs, OpenAI, Anthropic, AWS, Distributed Systems, Agentic Workflows
**Posted:** 2026-03-02

> Owns end-to-end development of agentic workflow engine and AI Copilot for natural language workflow creation/debugging. Builds LLM integrations, orchestration layer, and maintains production reliability in Next.js monorepo.

## Job Description

## Responsibilities
- 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

## Requirements
- 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

## Nice-to-Haves
- Experience with **AWS** infrastructure
- Contributions to open-source projects

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**Canonical:** https://hotfix.jobs/jobs/2f9e3738-92ed-4c1e-8a3a-bce0d118a8c6