Sim Infotech Inc.

Software Engineer, Agents

San Francisco

H1B sponsorship availableDetected 141 days ago

JavaScriptTypeScriptNext.jsDistributed SystemsGitAWSLLMs

About the role

This spans our backend (Next.js), orchestration layer, and all integrations with LLMs and external APIs.
Your job is to keep it there and push it further - making it faster, more reliable, and capable of handling increasingly complex agentic architectures.
You'll set architecture decisions, reliability standards, and coding patterns that define how the core product works.

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
Experience integrating with LLMs or building on top of foundation model APIs
You'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.

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

Sim 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.

This listing is sourced directly from Sim Infotech Inc.'s careers page and normalized into a canonical job model.