A cryptography and PKI Expert is required for an initial 6 month contract. this is a hybrid role with some on site in London and is inside IR35 so will require working via an FCSA accredited umbrella company. *5+ years in applied cryptography, PKI operations, or cryptographic engineering roles *Expert-level knowledge of symmetric and asymmetric algorithms (AES, RSA, ECC, EdDSA, SHA-2/3, HKDF, HMAC) *Experience designing and maintaining scalable PKI architectures (MS ADCS, EJBCA, Venafi, HashiCorp Vault, or similar) *Deep understanding of TLS/SSL, certificate pinning, mutual TLS (mTLS), and secure session negotiation *Proficiency with HSMs and key lifecycle tools (e.g., Thales, AWS CloudHSM, Azure HSM, Utimaco) *Hands-on with certificate automation protocols (ACME, EST), and tools like Certbot, Smallstep, or Vault PKI
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