Interim Chief Information Security Officer (CISO), Blockchain, Crypto & Web3 Security

The Company is seeking a Chief Information Security Officer to own security for its blockchain protocol and integrated network. Responsibilities include managing key custody and signing architecture; securing validators, nodes, bridges, smart contracts, identity systems, cloud infrastructure, and AI-related services; and leading incident response. The CISO will oversee audits, remediation and retesting, establish secure development practices and a bug-bounty program, and work closely with protocol, reliability, and contract engineering teams. The role also includes building and leading the security team and communicating risks and priorities to senior leadership. Candidates must have 10 or more years of information security experience, including at least three years in a senior security leadership role, and hands-on experience securing a production Web3 or blockchain system. Required expertise includes key management and custody, signing technologies, blockchain infrastructure, smart-contract security, audit remediation, and leading an on-chain incident response. Applicants should be comfortable working directly with engineers and demonstrate the ability to lead teams and make security decisions. Experience with post-quantum cryptography, blockchain frameworks, AI security, bug-bounty programs, or security standards is an advantage; relevant certifications are also a plus.