Chief Blockchain Security Architect

Bullish, Inc.; New York (NY); On-site; USD 260,000 - 275,000; Full time

Job summary

Bullish, Inc. is seeking a Head of Blockchain Security to own and elevate the end-to-end security posture of our blockchain infrastructure, custody systems, and smart contract protocols.

You will operate as a technical authority and strategic partner to internal teams, protocol founders, and external security partners. You will design scalable security frameworks, lead audits across multi‑chain environments, and engineer rapid-response mechanisms to protect assets.

Qualifications

• 7+ years in cyber security with 5+ years in blockchain and smart contract security.
• Hands-on experience with Solidity, Rust, and Move; strong Linux and cloud-native architectures (AWS, Azure, GCP).
• Experience in penetration testing, application security, threat modeling (OWASP Top 10, SANS CWE 25).
• Deep expertise in applied cryptography (PKI, encryption) and network fundamentals (IP, DNS, HTTP, TLS).
• Knowledge of institutional custody infrastructure and major DeFi protocols across Ethereum, Solana, Stacks, and Sui.

Responsibilities

• Lead deep-dive architectural reviews and security audits of smart contracts and protocols.
• Produce clear, prioritized technical risk reports for protocol founders, engineering leads, and exec leadership.
• Build, deploy, and maintain blockchain monitoring and automated detection systems.
• Design and operate automated emergency exit workflows to protect assets.
• Assess external custody systems, treasury controls, and third-party vendor infrastructure.
• Scale security programs with repeatable frameworks and processes.

Skills

Cyber security

Blockchain security

Smart contract security

Threat modeling

Communication

Education

Offensive security certifications (OSCP/OSWE/OSCE)

Tools

Linux

AWS

Azure

GCP

Job description

Bullish, Inc. is seeking a Head of Blockchain Security to own and elevate the end-to-end security posture of our blockchain infrastructure, custody systems, and smart contract protocols.

You will operate as a technical authority and strategic partner to internal teams, protocol founders, and external security partners. You will design scalable security frameworks, lead audits across multi‑chain environments, and engineer rapid-response mechanisms to protect assets.