← Security Engineering & Assurance
Security Engineering & Assurance
Cryptography Engineer
Not accepting applications
Remote
Remote-friendly
Temps plein
Access tier: T4
Background screening required
Professional credentials required
Bonding or insurance required
About Sequester
Sequester is a privacy-first encrypted vault for personal photos and videos. We build software where security, reliability, and user trust are product features???not afterthoughts.
About this role
You will design and review the cryptographic core of Sequester???how keys are derived, wrapped, rotated, and never exposed???so "encrypted vault" is a provable claim, not marketing.
What you will do
- Design and review algorithms for client-side encryption, key derivation, and secure backup
- Evaluate third-party crypto libraries and reject unsafe primitives or configurations
- Document threat models and crypto agility plans for algorithm upgrades
- Pair with backend and mobile teams on correct API usage (nonces, AEAD, key hierarchies)
- Respond to internal research questions and external researcher reports on crypto design
What we are looking for
- Applied cryptography experience in production systems (not academic-only)
- Strong math fundamentals and familiarity with libsodium/BoringSSL/WebCrypto patterns
- Ability to explain tradeoffs to non-cryptographers without oversimplifying risk
- Background screening and credential requirements per tier-4 access policy
Location
Remote-friendly. We hire globally and collaborate async-first across time zones.
Not currently accepting applications
This role page remains available for reference, but we are not accepting new applications right now. Check back later or browse other openings. Parcourir les offres