Sim

Sim is an open-source AI workspace where teams build, deploy and manage AI agents across their organisation. Founded in 2025 and headquartered in San Francisco, the company has grown quickly: more than 100,000 builders now use the platform, which connects hundreds of integrations and every major large language model under a single system of governance for access, spend, data and deployment. Sim raised a $7M Series A and is backed by Y Combinator and angels including Paul Graham.

The platform is unusual in spanning the full range of engineering preferences. Agents can be assembled visually on a drag-and-drop Workflow Canvas, described conversationally through chat, or built programmatically via code and a command-line interface. This breadth - open-source foundations paired with developer-grade tooling and the option to self-host on Docker or Kubernetes - appeals to teams that want both accessibility and control. Customers span industries from automotive, including Rivian and Volkswagen Group Technologies, to real estate at eXp Realty.

For engineers, the enterprise side is as considered as the developer experience. Sim carries SOC 2 Type II compliance, ISO 27001 certification and GDPR compliance, and provides SSO/SCIM provisioning, permission groups and spend controls - the governance machinery that agentic systems require before they can be trusted with production workloads. The technical domains are accordingly deep: LLM orchestration, agentic workflow design, workflow automation, identity and access management, and enterprise security.

Working at Sim means joining a rapid-growth startup at the point where open-source software, developer tooling and enterprise rigor converge - a small operation whose product has already reached six-figure adoption.