Security Jobs in Fontana, CA

Protocol Security Engineer

We are seeking a Protocol Security Engineer to join our Security Team. This role blends hands-on security work with the opportunity to influence protocol security from the earliest stages of development. You'll focus on safeguarding ZKsync's core componentssmart contracts, ZK circuits, and blockchain nodeswhile staying at the forefront of security research and industry best practices.

This role is ideal for someone who is curious, thrives on breaking systems, and wants to apply that mindset ethically in a high-stakes environment.

What You'll Be Doing

• Intentionally breaking things conducting threat modeling and internal reviews of Solidity contracts, blockchain state transition functions (Rust), and other critical systems
• Tracking the latest hacks, exploits, and attack vectors across the industry, and translating lessons learned into actionable security improvements
• Embedding security best practices across development teams and influencing secure design
• Taking ownership of protocol components with a focus on secure architecture and implementation
• Participating in security investigations and incident response, often under time-sensitive and high-pressure conditions

What We're Looking For