Protocol Security Engineer

Delphiventures; Alexandria (VA); Remote; USD 180,000 - 240,000; Full time

Benefits offered by this job

Remote work

No time tracking

Travel to team gatherings and industry

Job summary

Matter Labs is seeking a senior security-focused engineer to protect ZKsync core components, including smart contracts, zero-knowledge circuits, and blockchain nodes. You will lead threat modeling, code reviews, and incident response, with a hands-on approach to finding and fixing vulnerabilities.

The role emphasizes secure architecture, adversary research, and cross-team security advocacy, with opportunities to shape the security posture of critical distributed systems.

Qualifications

• Experience in security engineering or security research with threat modeling, code review, or vulnerability research on production systems.
• Strong coding experience in systems/programming languages and ability to reason about security implications.
• Familiarity with blockchain or distributed systems security concepts is a plus.
• Clear written and spoken English, the company's working language.
• Proficiency with Rust and Solidity is beneficial; prior experience not required.

Responsibilities

• Conduct threat modeling and review of Solidity contracts and blockchain state transition functions.
• Own secure architecture and implementation of protocol components from design to production.
• Track adversaries by following hacks, exploits, and new attack vectors and translate lessons into concrete improvements.
• Scale secure design practices across development teams and influence architecture decisions early.
• Apply modern AI tools to augment security work while anticipating attacker use of similar tools.
• Participate in security investigations and incident response under time-sensitive conditions.

Skills

Security engineering

Threat modeling

Security-focused code review

Vulnerability research

English communication

Tools

C++

Go

Scala

Rust

Solidity

Job description

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 primary languages, and prior experience with them is not required.

• Deep grounding in algorithms and data structures, including their computational and memory complexity, with experience implementing them from scratch.

• Protocol-level debugging and root-cause analysis on complex distributed systems.

• Working knowledge of recent security incidents in the blockchain space and the prevention techniques behind them.

• Clear written and spoken English, the company's working language.

Nice to have

Hands-on experience with Solidity smart contracts, ZK circuits, or core blockchain protocols. Public security research, audit reports, bug-bounty results, or CTF history all count as evidence.

Work model & pay

• Competitive base salary. Matter Labs applies no geographic pay discounts.

• Performance-based variable compensation with a defined annual target is additional. The plan may pay in ZK tokens or cash. A long-term token incentive is also additional and is paid in ZK tokens, with new-hire grants vesting over four years and a one-year cliff.

• Fully Remote. Occasional travel to team gatherings and industry events.

• Freedom & ownership culture: no time tracking (where legally applicable), minimum bureaucracy-only results matter.