Full Stack Software Engineer, World ID

Full Stack Software Engineer, World ID

Tools for Humanity

About the Company

World is building a real human network designed to accelerate people in the age of AI. As bots and autonomous agents reshape the internet, people, institutions, and applications need a trusted way to confirm who is a real human while preserving privacy. Our products make this possible: the Orb verifies real people, World ID proves it privately, and World App enables and distributes the new applications made possible by this technology. Together, they form a new layer for the AI internet.

We’re one of the fastest-growing networks in tech. More than 17 million people across 160 countries have verified with World ID, and we complete over 350,000 verifications each week. World App is already among the most used wallets globally. Developers are integrating World ID to build safer online experiences and create spaces where real people can participate, earn, and be recognized in ways AI simply can’t replicate.

World was founded in 2019 and launched globally in 2023. We have over 400 people across hardware, software, AI, cryptography, mobile engineering, and global operations. Our teams come from OpenAI, Tesla, SpaceX, Apple, Google, Stripe, Meta, Coinbase, Palantir and MIT Media Lab. We’re backed by leading investors, including a16z, Khosla Ventures, Bain Capital Crypto, Blockchain Capital, Variant, Tiger Global, and Coinbase Ventures.

World has been featured on the cover of TIME Magazine, highlighted in Fast Company’s Next 5 in Fintech, and explored in a Bloomberg deep dive. The New York Times, Bankless and TechCrunch have all recognized our progress in identity, cryptography, AI, and global-scale hardware deployment. Our leadership is also named to the Time AI 100.

Responsibilities

• Web SDK Development: 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.
• Partner Integrations: Work directly with partners to support their integration efforts, building reference applications, browser add-ons, and other tools to ensure their success on our platform.
• API Development: Build and scale efficient, reliable APIs and backend services using TypeScript to support our own applications, SDKs, and partner needs.
• Web Application Development: Design, build and maintain essential web components, reference implementations and end‑user facing applications that use World ID.
• Cross‑functional Collaboration: Work closely with product managers, designers, other engineers and XFN stakeholders to deliver cohesive and impactful solutions.
• Technical Leadership: Optionally support a small group of junior engineers and external contractors as a hands‑on technical lead, guiding design, reviewing code, and ensuring urgency, completeness and quality.

About you

You have a proven track record of building high‑quality web applications and well‑designed developer APIs and SDKs. You are fluent in the modern web stack and possess the backend proficiency to build and manage the services that power your applications. You are passionate about creating excellent developer experiences and understand that the success of an SDK is measured by the success of the developers who use it. 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. You are an effective and respected tech lead of small teams.

Requirements

• Excellent communication skills and a collaborative mindset, with the ability to articulate technical concepts to both technical and non‑technical audiences.
• Experience supporting third‑party developers and partner integrations.
• 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.

By submitting your application, you consent to the processing and internal sharing of your CV within the company, in compliance with the GDPR.

Pay transparency statement

The reasonably estimated salary for this role at TFH ranges from $220,000 - $250,000 , plus a competitive long‑term incentive package. Actual compensation is based on factors such as the candidate's skills, qualifications, and experience. TFH offers a wide range of best‑in‑class, comprehensive and inclusive employee benefits including healthcare, dental, vision, a 401(k) plan and match, life insurance, flexible time off, commuter benefits, professional development stipend and much more.