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# Product Security Engineer (Blockchain Security)

- **Company:** Ant-Tech
- **Location:** Lyon, France (Remote available)
- **Salary:** €75,000.0 - €85,000.0
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Static Program Analysis, Cyber Security, Continuous Integration, Distributed Systems, Dynamic Program Analysis, Cryptographic Protocols, Oracle (Applications), Blockchain, Security Software, Software Engineering, Software Security, Tenable Nessus, Codebase, Web3.js, Blockchain Security, Vulnerability Analysis
- **Published:** June 16, 2026
- **Apply:** https://fr.indeed.com/viewjob?jk=2fe03584ae384962

## About the Role

Do you have experience in Software development?, * Strong hands-on experience in vulnerability discovery and security testing across blockchain systems.

 * Proven ability to identify real vulnerabilities beyond automated scanning tools.
 * Experience performing threat modeling and security architecture reviews.
 * Deep understanding of blockchain security, smart contracts, nodes, APIs, and distributed systems.
 * Experience assessing cryptographic protocols, trust models, or cross-chain infrastructure.
 * Strong knowledge of applied cryptography and modern security principles.
 * Ability to audit and review Rust and/or Java codebases.
 * Understanding of memory safety, secret management, and secure software development practices.

Preferred Qualifications

 * Experience developing fuzzing infrastructure or advanced security testing frameworks.
 * Experience with static analysis, dynamic analysis, and automated security tooling.
 * Background in consensus-layer security or blockchain protocol development.
 * Experience auditing cross-chain bridges.
 * Knowledge of threshold signature systems, multisig architectures, and oracle security.
 * Experience integrating AI-assisted workflows into security review processes.

## Description

As the platform expands its protocol capabilities, smart contract ecosystem, and cross-chain infrastructure, the security team is seeking a highly skilled Product Security Engineer to proactively identify vulnerabilities, strengthen protocol security, and protect critical blockchain systems before they reach production.

What You'll Do

 * Conduct end-to-end security assessments across blockchain protocols, smart contracts, cryptographic systems, and infrastructure.
 * Identify real-world vulnerabilities through manual review, adversarial testing, and proof-of-concept exploit development.
 * Design and execute security testing strategies for protocol components, cross-chain bridges, and distributed systems.
 * Lead threat modeling exercises and security architecture reviews.
 * Define and enforce security gates throughout the software development lifecycle.
 * Collaborate closely with engineering teams to prioritize and remediate security risks.
 * Build and improve security tooling, fuzzing frameworks, and CI/CD security automation.
 * Research emerging Web3 attack vectors and proactively mitigate potential threats.


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