Blockchain Security Engineer

About You

You’re a self-starter who thrives on tackling the toughest and most meaningful problems, even if they are the most difficult problems. You’re comfortable with the unknown and understand that #startuplife means that you’re going to be wearing multiple hats. And that’s what motivates you. You’re accountable and obsessed with improvement, both in yourself and in others. You’re up to the challenge of building a world-class company that aims to be the infrastructure for more secure software for all.

About The Company

CertiK leads blockchain security by protecting smart contracts and blockchains with cutting-edge Formal Verification technology. Founded by Computer Science professors of Yale University and Columbia University, CertiK has audited and secured over $500B in assets, including many of the world’s top blockchain projects.

About The Role

The primary responsibility of this Blockchain Security Engineer 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.

What We Offer

• Opportunity to shape the national conversation on blockchain and security.
• Collaborate with industry-leading security researchers, technologists, and global institutions.
• Flexible work environment and mission-driven culture.

Key skills/competency

• Blockchain Security
• Formal Verification
• Smart Contract Auditing
• Vulnerability Assessment
• Consensus Mechanisms
• Penetration Testing
• Python Scripting
• Bash Automation
• Docker
• Web3 Security