Blockchain Security Expert - Chain Security Evaluation Track

About the Role

The primary responsibility of this role is for CertiK’s security-related services. Intersecting cybersecurity and blockchain, CertiK’s security offerings include security consulting, security reviews, security auditing of smart contracts and blockchains, verification of smart contracts, penetration testing, and more.

As a Security Engineer at CertiK, you will contribute to the security offerings of the company, working with the rest of the security team to deliver the best products and services. You might engage directly with CertiK’s existing and future clients, participate in expanding security-related products and services, and follow the blockchain world on emerging security problems and trends.

Responsibilities

• Conduct in-depth security evaluations on blockchain nodes, validators, consensus mechanisms, mempool behavior, networking layers, and chain modules.
• Review and analyze blockchain frameworks such as Cosmos SDK, CometBFT, Geth, Hyperledger, and other L1/L2/L3 infrastructures.
• Identify security issues related to consensus safety, chain halting, permission models flaws, block production vulnerabilities.
• Implement and run custom scripts and test scenarios to simulate real-world validator/network behaviors, chain stress conditions, and edge cases.

Requirements

• Strong written and spoken English communication skills.
• High diligence and strong attention to detail, especially in multi-step testing and long-running experiments.
• Solid understanding of blockchain architecture and node internals (e.g., Cosmos SDK / CometBFT, Go-Ethereum (Geth) internals, and Hyperledger Fabric / Besu)
• Strong scripting & automation skills with Python or Bash
• Familiarity with Docker and containerized testing environments.
• Prior experience in manual Web3 security auditing is preferred, but not required.