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# Security Engineer- Smart Contract Auditor (Crypto / Blockchain)

- **Company:** Caiz
- **Location:** Frankfurt am Main, Germany (Remote available)
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, Software System Penetration Testing, Cyber Security, Software Debugging, Formal Verification, Fuzz Testing, Blockchain, Secure Coding, NFT, Information Technology, Ethereum, Solidity, Blockchain Security
- **Published:** July 19, 2026
- **Apply:** https://www.adzuna.de/details/5804551923

## About the Role

* 3-5 years of experience in blockchain security, smart contract auditing, or cybersecurity roles.
 * Strong understanding of Ethereum, Solidity, and EVM-based chains (experience with other chains like BSC, Polygon, Polkadot, or Layer-2s is a plus).
 * Hands-on experience auditing DeFi protocols, staking contracts, NFTs, or DAO governance contracts.
 * Proven experience with blockchain security tools (e.g., MythX, Slither, Echidna, Foundry, Tenderly, Hardhat, Truffle).
 * Knowledge of cryptographic principles (hashing, signatures, zero-knowledge proofs) and applied security.
 * Experience publishing or contributing to audit reports, whitepapers, or security advisories is a strong plus.
Expert in Solidity, smart contract development, and debugging.

 * Strong analytical and problem-solving skills for identifying complex vulnerabilities.
 * Proficiency in penetration testing, fuzzing, and formal verification methods.
 * Ability to clearly document findings and communicate with both technical and non-technical stakeholders.
 * Familiarity with secure coding guidelines and blockchain threat landscapes.

Level of studies: Bachelor's or Master's degree in Computer Science, Cybersecurity, Cryptography, or related technical field.

Language Requirements: Fluent in English

## Description

* Conduct comprehensive audits of smart contracts, blockchain protocols, and decentralized applications (dApps).
 * Identify, analyze, and remediate vulnerabilities in smart contracts, including reentrancy, overflow/underflow, logic errors, gas optimization issues, and governance risks.
 * Design and implement security best practices for smart contract development and deployment.
 * Collaborate with blockchain engineers to review architecture and propose secure design improvements.
 * Perform penetration testing and threat modeling specific to blockchain and DeFi environments.
 * Write detailed audit reports, including vulnerabilities, risk assessments, and recommendations.
 * Monitor deployed contracts and blockchain infrastructure for abnormal activities and potential exploits.
 * Stay updated on the latest blockchain security threats, vulnerabilities, and industry best practices.
 * Educate internal teams on security awareness, safe coding practices, and emerging risks.


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