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Senior Software Engineer, Web & Full Stack

Tools for Humanity

Salary not specified
Sep 10, 2025
San Francisco, CA, US
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Expanding the World ID ecosystem by building developer and user-facing APIs, web experiences, developer tools, SDKs, and end-user applications to drive adoption of the World network.

Requirements

  • Expertise with modern web frameworks based on JavaScript and TypeScript.
  • Experience building and maintaining public-facing SDKs or developer-focused libraries.
  • Experience with server-side development and building RESTful APIs (familiarity with Go, Rust, or other compiled languages is a plus).
  • Ability to work across the full stack, from web servers and simple database interactions to client-side application logic.
  • Experience supporting third-party developers and partner integrations.

Responsibilities

  • You will own the design, development, and maintenance of our public-facing JavaScript/TypeScript SDK, ensuring it is robust, well-documented, and easy for partners to use.
  • You will work directly with our partners to support their integration efforts, building reference applications, browser add-ons, and other tools to ensure their success on our platform.
  • You will build and scale efficient, reliable APIs and backend services using TypeScript to support our web applications, SDKs, and partner needs.
  • You will design, build and maintain essential web components, reference implementations and end user facing applications that use World ID.
  • You will work closely with product managers, designers, other engineers and other XFN stakeholders to deliver cohesive and impactful solutions that advance the World network.

Other

  • Excellent communication skills and a collaborative mindset, with the ability to articulate technical concepts to both technical and non-technical audiences.
  • You can communicate clearly, work effectively in a fast-paced environment, and are motivated by the challenge of building the user- and developer-facing layers of an ambitious, world-changing protocol.