Blockchain Security Engineer: Node & Protocol Evaluations

CertiK; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical insurance

Vision insurance

Dental insurance

401(k) plan with company matching

Life and AD&D insurance

HSA/FSA benefits

Flexible paid time off

Job summary

CertiK is seeking a Security Engineer to join its security services team, intersecting cybersecurity and blockchain. You will contribute to security offerings, perform evaluations on nodes and networks, and engage with clients to expand security products and services.

You will work with a team of researchers to tackle emerging security problems and trends in the blockchain space, delivering robust security verification and testing.

Qualifications

• Strong written and spoken English communication.
• High diligence and attention to detail in multi-step testing and long-running experiments.
• Solid understanding of blockchain architecture and node internals (Cosmos SDK / CometBFT, Geth, 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.

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.

Skills

English proficiency

Scripting (Python/Bash)

Blockchain architecture

Web3 security auditing

Attention to detail

Tools

Docker

Job description

CertiK is seeking a Security Engineer to join its security services team, intersecting cybersecurity and blockchain. You will contribute to security offerings, perform evaluations on nodes and networks, and engage with clients to expand security products and services.

You will work with a team of researchers to tackle emerging security problems and trends in the blockchain space, delivering robust security verification and testing.