Security Engineering & Assurance

Cryptography Engineer

Not accepting applications

Remote Remote-friendly 全职 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. 浏览职位