Client: US technology company (digital identity and payments infrastructure) · Location: remote, LATAM, US Eastern overlap · Level: senior · Engagement: full-time contractorYou will own applied cryptography across the product: key management, protocol design review and the migration plan to post-quantum algorithms.What you will doDesign and operate key management on HSMs and cloud KMS, including rotation, escrow and ceremoniesReview protocol and feature designs for correct use of encryption, signatures and key exchangeRun PKI: certificate authorities, issuance automation and mTLS between servicesBuild the crypto inventory and lead the roadmap to NIST post-quantum standards (ML-KEM,



ML-DSA)Maintain internal crypto libraries and guidance so product teams do not roll their ownSupport audits and certifications such as FIPS *****, PCI DSS and SOC 2What you bring6+ years in security engineering, 3+ focused on applied cryptographySolid command of modern primitives and protocols (AES-GCM, ECC, TLS 1.3, Noise, JOSE)Hands-on HSM and KMS experience (Thales, AWS CloudHSM, AWS KMS or equivalent)Coding in Go, Rust or C, with secure coding and code review experienceAbility to explain cryptographic risk to non-specialists in EnglishNice to haveThreshold signatures, MPC or zero-knowledge proof experienceDegree or research background in cryptographyContributions to open-source crypto libraries
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📌 Cybersecurity Engineer, Cryptography (Mendoza)
🏢 Itmates
📍 Mendoza