Protocol Security Engineer at Matter Labs

About Matter Labs Matter Labs builds private settlement infrastructure that lets regulated institutions settle directly with each other without exposing data, ceding control, or waiting days. Global finance moves $4 quadrillion a year on systems designed for paper and telex. The institutions that built them - from clearing houses to exchanges to the world's largest banks, institutions are now actively replacing them. Our core product, Prividium, gives each institution its own private settlement environment (a Prividium Zone) with independent governance and built-in interoperability across counterparties, asset classes, and jurisdictions. Settlement happens through zero-knowledge proofs: one party proves a transaction is valid without revealing any underlying data to the counterparty. The only private settlement infrastructure built on zero-knowledge cryptography. Founded in 2018. Backed by a16z and Union Square Ventures. A fully remote team of around 70 with eight years of production zero-knowledge infrastructure behind us, now pointed at the biggest problem in institutional finance. The role You will protect ZKsync's core: smart contracts, ZK circuits, and blockchain nodes. Your reviews, threat models, and incident work decide whether vulnerabilities are found by us or by attackers. The role owns internal security reviews of critical components, threat modeling, adversary research, and the security side of incident response, and it carries broad license to spot gaps and fix them beyond any assigned list. It is a hands-on individual contributor role for someone who wants to know how things break and applies that instinct ethically where the stakes are high. What you'll do Break things on purpose. Threat-model and review Solidity contracts, blockchain state transition functions in Rust, and other critical systems before an attacker gets the chance. Own protocol components. Take responsibility for the secure architecture and implementation of the components you adopt, from design review through production. Track the adversary. Follow hacks, exploits, and new attack vectors across the industry and convert the lessons into concrete improvements in our systems. Scale security through others. Embed secure-design practice across development teams and influence architecture decisions early, without formal authority. Use AI on defense. Apply modern AI systems to scale security work, while accounting for attackers using the same tools. Respond when it counts. Join security investigations and incident response, often under time pressure with incomplete information. What we look for Each of these is a demonstrated capability, shown through work you have done: A record in security engineering or security research: threat modeling, security-focused code review, or vulnerability research on production systems, with findings you can walk through mechanism by mechanism. Proficiency in strongly typed languages such as C++, Go, or Scala. Rust and Solidity are our p