Software Engineer, Developer Products

present of AI; United States; Remote; USD 120,000 - 160,000; Full time

Job summary

OpenRouter is seeking an API/SDK owner to make it easy for developers to build on the platform. You will own the public API, client libraries in TypeScript and Python, a CLI, and documentation to help external engineers start quickly.

A strong candidate has shipped libraries or APIs used by external engineers, writes clearly, and can lead a looser problem to launch with minimal direction. You will shape versioning and error behavior, and produce materials to help users get started.

Qualifications

• Shipped libraries or APIs that external engineers rely on.
• Write clearly and communicate effectively in technical material.
• Take a loose problem and carry it through to launch without waiting for direction.
• Consider versioning and error behavior in design decisions.

Skills

Strong TypeScript

Clear technical writing

Agentic tooling projects

Tools

Python

Job description

This role asks for someone to own the public API and the tools developers use to connect to it, including client libraries in TypeScript and Python, a command line tool, and documentation. A strong candidate has shipped libraries or APIs that outside engineers actually rely on, writes clearly, and can take a loose problem and carry it through to launch without waiting for direction. The work spans design choices like versioning and error behavior as well as the written material that helps people get started.

How it fits the AI era

Much of the job is making the platform easy for AI coding agents to use, since those agents now read the docs and call the API alongside human developers. That means shaping entry points, examples, and error messages so both audiences succeed on the first try. The human parts remain judgment about what makes a library good, clear writing, and deciding which gaps in the ecosystem are worth closing.

How it builds AI experience

Working here means building tooling for multi step agent workloads and watching how agents actually consume the API and SDKs, which is direct hands on practice with agentic systems. A candidate can prepare by using OpenRouter itself, trying its API and SDKs, and studying how agent SDKs are designed. Open source contributions or side projects in AI tooling would show that experience concretely.

Worth showing

• Shipped public API or SDK
• Strong TypeScript
• Python library work
• Clear technical writing
• Agentic tooling projects

This is our own read, written from the employer's posting and the company's Spotlight. The employer's posting is the source of truth for the role.

About OpenRouter

OpenRouter is a unified API gateway and marketplace that routes requests across hundreds of AI models from many providers, per the company.