Senior Backend Engineer, Security

Job description

About Shelf Shelf builds software that helps enterprises make AI work in the real world. That only works when our systems are secure, observable, and maintainable under real production pressure. About the Role: This role is for a senior backend engineer who will focus full-time on security work. We are not looking for a policy-only security person. We are looking for a hands-on engineer who can improve our security posture by changing real systems, fixing real problems, and following through until the work is fully implemented and maintained. This role is embedded close to support and operational engineering, so it stays connected to real incidents, real customer impact, and real follow-through. The scope is broader than one team. You will work across the company’s engineering surface wherever security work needs to land. What You Will Own: - Find and fix concrete security issues in production systems, not just identify them. - Improve token lifecycle, revocation, auth flows, auditability, and access controls across backend systems. - Reduce or eliminate security-sensitive data exposure in logs, events, traces, and internal tooling. - Improve security detection, logging, and audit...