Senior Backend Engineer, Security

Shelf

Poland, Poland
On-site
Hands-on security improvements
Production systems security
Token lifecycle and revocation
This role is for a senior backend engineer who will focus full-time on security work, improving our security posture by changing real systems

Job Summary

  • This role is for a senior backend engineer who will focus full-time on security work, improving our security posture by changing real systems.
  • You will own finding and fixing concrete security issues, improving token lifecycle, revocation, auth flows, auditability, and access controls across backend systems.
  • Shelf offers company stock options, a MacBook Pro, and a modern technical stack with opportunities to develop open-source software.

Matching Summary

This role is for a senior backend engineer who will focus full-time on security work, improving our security posture by changing real systems.

Skills & Requirements

Must-have

  • hands-on security improvements
  • production systems security
  • token lifecycle and revocation
  • reduce sensitive data exposure
  • improve security detection and logging
  • rotate secrets and tighten access
  • AI-native working style

Nice-to-have

  • improve security posture after incidents
  • AI-security and LLM systems
  • improve queryability for incident response
  • move systems to safer patterns

Key Requirements

  • Strong senior-level backend engineering experience
  • Real hands-on experience implementing security improvements
  • Experience with application-security topics
  • Strong debugging and investigative instincts
  • Comfort working across many services and repositories
  • Ability to go from problem statement to implementation to enforcement
  • Clear written and verbal communication

Work Rights

Not specified

Tailored Resume

Cover Letter