Staff Cryptographer

CYFR Watch's zero-knowledge architecture depends on applied cryptography that is correct, performant, and provably secure. We are seeking a staff cryptographer to design and review our key exchange protocols, per-session encryption schemes, and future privacy-preserving features.

Responsibilities

• — Design and formally specify cryptographic protocols for client-side encryption
• — Review and harden existing key exchange and session negotiation implementations
• — Collaborate with backend engineers to integrate cryptographic primitives correctly
• — Author security proofs, threat models, and protocol documentation
• — Stay current with developments in applied cryptography and post-quantum readiness
• — Advise leadership on cryptographic roadmap and risk assessment

Requirements

• — PhD or equivalent research experience in cryptography or a closely related field
• — Published peer-reviewed work in applied cryptography, protocols, or formal verification
• — Fluency in at least one systems language (Rust, C, Go) and Python
• — Experience implementing cryptographic primitives — not just using libraries
• — Strong understanding of side-channel attacks and mitigations

Nice to Have

• — Experience with zero-knowledge proofs (zk-SNARKs, Bulletproofs)
• — Familiarity with threshold cryptography and MPC
• — Contributions to cryptographic standards bodies (IETF, NIST)

Apply for this position

Send us your resume and a brief cover letter. We review every application.

We respond within 5 business days.