About Nethermind

Nethermind is a blockchain research and software engineering company building high-performance infrastructure, security tooling, and cryptographic systems across the Ethereum ecosystem and beyond. We work closely with protocol teams, L2s, and ZK projects to help design, review, and secure cutting-edge decentralized systems.

We are expanding our Team and are looking for engineers with hands-on experience auditing cryptographic and zero-knowledge systems.

The Role:

As a Zero Knowledge/Cryptography Auditor, you will evaluate the correctness, soundness, and security of cryptographic protocols and ZK systems. Your work will span Ethereum and Aztec ecosystems, including primitives, zkDSLs, and zkVM guest code.

You’ll collaborate closely with other security engineers and researchers, contribute to internal tooling, and engage directly with clients to improve the security posture of their protocols.

Responsibilities:

Perform security reviews and audits of cryptographic and zero-knowledge systems, including primitives, protocols, zkDSL circuits, and zkVM guest programs
Analyze correctness, soundness, completeness, and potential privacy leakage in ZK programs
Review production code used in Ethereum and Aztec ecosystems and help teams identify and remediate vulnerabilities
Collaborate with teammates to maintain and improve Nethermind’s internal blockchain security tooling
Design and implement new security tools for cryptography and ZK systems
Stay up to date with emerging ZK constructions, proof systems, and attack vectors
Participate in client meetings to explain findings, recommend best practices, and support remediation efforts
Contribute to internal knowledge sharing, research notes, and (optionally) public-facing content

Requirements:

1+ year of experience performing security reviews related to cryptography, zero-knowledge systems, or closely related domains
Bachelor’s or Master’s degree in Computer Science, Cyber Security, Mathematics, or a related field
Strong foundation in cryptography, including:
Solid theoretical understanding of cryptographic primitives and protocols
Practical experience implementing and/or auditing cryptographic systems
Strong proficiency in Rust (experience auditing Rust codebases is a strong plus)
Deep understanding of Zero-Knowledge systems, including:
Hands-on experience with at least one ZK proof system (e.g. Groth16, PLONK, Halo2, Bulletproofs)
Proven usage of at least one zkDSL (e.g. Circom, Noir, Halo2, Cairo, etc.)
Understanding of zkVM architectures and proof pipelines
Ability to identify common cryptographic and ZK vulnerabilities
Strong debugging skills; experience with reverse engineering is a plus
Clear written and verbal communication skills

Nice to have:

Multiple years of experience in traditional cybersecurity before moving into blockchain
Experience reviewing or implementing advanced cryptographic primitives such as:
Threshold signatures
Fully Homomorphic Encryption (FHE)
Anonymous credentials
Familiarity with or experience working on ZK rollups or L2s (e.g. Aztec or similar systems)
Publicly available audit reports, blog posts, or presentations on cryptography or ZK security
Experience working in client-facing security roles

What We Offer/ Benefits

Flexible Work Options: Remote-first culture with the opportunity to work from anywhere.
Global and Diverse Workforce: You'll work with people from various backgrounds and cultures.
Learning and Development: You'll work on innovative, challenging projects and have access to experts and mentors to enhance your skills.
Career Growth: Access to training, mentorship, and opportunities to contribute to open-source initiatives.
Global Events and Conferences: Opportunities to attend the industry events.
Collaborative and Innovative Culture: We foster teamwork and encourage new ideas.

Our Commitment to Diversity

At Nethermind, we celebrate diversity and are committed to creating an inclusive environment for all team members. We believe a variety of perspectives drives innovation and leads to better solutions for the blockchain community.

Ready to Join Us?

If you're passionate about blockchain and eager to make an impact, we’d love to hear from you. Click Apply for this job to start your journey with Nethermind.

Zero Knowledge/Cryptography Auditor

EMEA

Remote

Entry & mid-level

Nethermind