Protocol Core Engineer

About the Char Network

Char Network is a proof-of-stake application coordination protocol built on Bitcoin. By anchoring data into Bitcoin through cryptographic proofs and economic guarantees, Char will power the next generation of Bitcoin layer twos.

Char Network is led by Bitcoin developer Jeremy Rubin and built by a small, sharp, and adventurous crew pushing the limits of what Bitcoin can be. We’re engineers who thrive on hard problems and bold ideas. Our work blends deep protocol expertise with a hacker’s creativity to unlock new capabilities for Bitcoin at scale.

We keep things collaborative, fast-moving, and fun—where every contribution counts and every voice matters. Joining Char Network means working at the frontier of Bitcoin R&D and infrastructure, where the code you write and the algorithms you create will shape the future of the ecosystem.

About the Role

This role will contribute to the development of Char Network, an open-source bitcoin staking platform.

Responsibilities

• Design, implement, and optimize high-performance systems using C++ and Rust.
• Develop and maintain secure, scalable, and reliable solutions for Bitcoin Layer 2 protocols.
• Conduct code reviews, troubleshoot complex issues, and ensure robust testing.

Qualifications

Must-Haves

• Expertise in C++ and Rust with a focus on systems programming.
• Experience with low-level programming and performance optimization.
• Strong problem-solving skills and ability to work in a collaborative, fast-paced environment.

Nice to Haves

• Experience building a bitcoin project or application
• Practical experience with cryptography

MZERO, LLC, the employer entity for Char Network, is an equal opportunity employer. We celebrate diversity and are committed to providing an inclusive environment for all employees. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or any other legally protected status.