5+ years experience building developer products like APIs and SDKs
Strong instincts for API and SDK design
Proficient in TypeScript, as it's widely used here
Interest in AI and agentic systems
High agency and initiative in spotting and solving problems
Comfortable with fluid team boundaries in a small company
Excellent written communication skills for documentation and reference materials
Responsibilities
Own and enhance the public REST API and developer experience
Build and maintain client SDKs across TypeScript and Python
Launch the new Agent SDK for multi-step, agentic workloads
Treat documentation and starter repos as key products
Ensure developer-facing surfaces are user-friendly for AI agents
Collaborate with cross-functional teams to address gaps in the developer ecosystem
Benefits
Flexible work environment with a focus on autonomy
Opportunity to shape product direction and feature expansion
Collaborative culture with a growing community of developers
Exposure to cutting-edge technologies in AI and developer tooling
Full Job Description
About the Role
We're hiring a Software Engineer on our Developer Products team to build the surfaces external developers use to integrate with OpenRouter - our API, SDKs, docs, CLI, and other tools. Today, this work is owned by a small group, and the developer ecosystem around OpenRouter is growing quickly. Your work will also shape how agents interact with our platform and integrations.
This role is ideal for engineers who love autonomy, value collaboration, and have a track record of shipping software that works. You'll play a critical role in shaping our product as we scale, helping expand our platform's features, and delivering exceptional experiences for our users.
What You'll Do
Own and evolve our public REST API and the developer experience around it - from API design and ergonomics to versioning, errors, and rate-limiting behavior.
Build and maintain our client SDKs across TypeScript and Python, and lead the launches of our upcoming SDKs.
Ship our Agent SDK, expanding it into a surface for multi-step, agentic workloads built on OpenRouter.
Treat documentation, examples, and starter repos as products - instrument what developers and AI coding agents land on first, and make sure those are strong entry points to OpenRouter.
Make every developer-facing surface agent-friendly, given that AI coding agents are users of our APIs and SDKs.
Collaborate with our DevRel, Product, and Platform teams to identify gaps in the developer ecosystem and run with them end to end.
About You
5+ years building external-facing developer products - APIs, SDKs, or developer platforms widely used by engineers.
Strong API and SDK design instincts; you've shipped libraries that developers integrate with and you have opinions about what makes them good.
Strong TypeScript skills; we're a TypeScript shop and TypeScript is widely used across the AI ecosystem.
AI-forward in your own workflow and interested in what agentic systems can do.
High agency and a bias toward action - you spot something missing in the developer ecosystem and ship it without waiting for a ticket.
Comfortable owning a product line at a small company where boundaries between teams are fluid.
Strong written communication; docs, changelogs, and SDK reference material are part of the job.
Pragmatic about tradeoffs between speed and simplicity.
Nice to Haves
Prior experience at developer-centric companies
Hands-on experience designing or maintaining agent SDKs or other agentic developer tooling.
Existing user of OpenRouter, contributions to open-source projects, or side projects in the AI tooling space.
If you don't think you meet all of the criteria below but still are interested in the job, please apply. Nobody checks every box, and we're looking for someone who is excited to join the team.
