Staff 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. We are seeking an experienced
Staff Engineer
with deep expertise in systems programming to join our core team. In this role, you will be instrumental in architecting and implementing foundational components of Bitcoin Layer 2 protocols and staking mechanisms. This is a high-impact position requiring technical leadership, hands-on development, and strategic contributions to the security and performance of our platform.

Responsibilities

• Architect, design, and implement high-performance, low-level systems using C++ and Rust.
• Lead and contribute to technical decision-making, ensuring robust security and performance best practices.
• Conduct in-depth code reviews, identify performance bottlenecks, and troubleshoot complex issues.
• Mentor and collaborate with other engineers, fostering a culture of technical excellence.

Requirements
Must-Haves

• Expert-level proficiency in C++ and Rust, with a focus on systems programming.
• Strong background in low-level programming, performance optimization, and concurrency.
• Experience designing and maintaining scalable, secure, and high-performance systems.
• Deep understanding of blockchain architectures and consensus mechanisms.
• Proven ability to lead technical initiatives and mentor junior engineers.

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.

Nice-to-have skills

• C++
• Performance Optimization
• Rust

• Miami, Florida, United States

Work experience

• Backend
• Blockchain

Languages

• English