Senior/Staff Software Engineer, Protocol

San Francisco — Protocol

About the Company:

World is a network of real humans, built on privacy-preserving proof-of-human technology, and powered by a globally inclusive financial network that enables the free flow of digital assets for all. It is built to connect, empower, and be owned by everyone.

This opportunity would be with Tools for Humanity.

About the Team:

The Protocol team is responsible for fulfilling this mission in a decentralized way by imagining, building, and maintaining trustless systems that can scale to billions of people. One of the ways we do this is through a privacy-preserving protocol that powers WorldID using state-of-the art cryptography. We are active in the Ethereum ecosystem, and work with the wider community to solve limitations around blockchain scalability. Our team builds Rust services deployed on Kubernetes clusters that generate and verify zero-knowledge proofs and interact with the Ethereum Blockchain and various Layer 2 solutions.

*This role is onsite based in our San Francisco, CA office

About the Opportunity:

This is a unique opportunity to lead the development and roadmap of a critical component of our Protocol, enabling privacy at scale. It represents the first step in building a privacy-preserving digital identity ecosystem.

Key Responsibilities:

  • 8+ years of experience in Rust. We prefer Rust expertise, but are also open to strong backgrounds in C++ and a willingness to ramp up quickly in Rust.

  • Contribute to cutting-edge advancements in blockchain and cryptography.

  • Help drive feature development and participate in rigorous code reviews.

  • Collaborate closely with experts across domains—from AI and cryptography to blockchain and hardware manufacturing.

  • Join a nimble team of blockchain engineers to execute on key product and company-wide initiatives while championing engineering best practices.

  • Take ownership of deployed services that underpin our scalability solutions.

About You:

  • You’re a builder at heart—versatile, hands-on, and excited to contribute across the full spectrum, from strategic architecture to implementation.

  • You bring strong technical depth in areas like distributed systems, applied mathematics, protocols, or blockchain—and you're eager to lead in one or more of these domains.

  • You’re fluent in systems-level programming (ideally in Rust) and comfortable working across a modern stack that includes smart contracts and web technologies.

  • You value clean, well-tested code and understand the importance of engineering best practices in scaling teams and systems.

  • Above all, you're excited to help shape the foundation of a privacy-preserving digital identity ecosystem.

What we offer : 

  • An open and collaborative office space in downtown SF 

  • Unlimited PTO  

  • Monthly Phone Reimbursement or a company device

  • Daily in-office meals 

  • Top-tier medical, dental, vision insurance 

  • 401k + employer match program 

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Pay transparency statement (for CA and NY based roles): 

The reasonably estimated salary for this role at TFH ranges from $225,000 - $275,000, plus a competitive long term incentive package. Actual compensation is based on factors such as the candidate's skills, qualifications, and experience. In addition,  TFH offers a wide range of best in class, comprehensive and inclusive employee benefits for this role including healthcare, dental, vision, 401(k) plan and match, life insurance, flexible time off, commuter benefits, professional development stipend and much more!

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

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Worldcoin participates in the E-Verify Program

Worldcoin is an Equal Opportunity / Affirmative Action employer committed to diversity in the workplace. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, age, national origin, disability, protected veteran status, gender identity or any other factor protected by applicable federal, state or local laws. Worldcoin is also committed to working with and providing reasonable accommodations to individuals with disabilities. Please let your recruiter know if you need an accommodation at any point during the interview process.

Worldcoin is also committed to working with and providing reasonable accommodations to individuals with disabilities. Please let your recruiter know if you need an accommodation at any point during the interview process.