Enterprise PKI Specialist (Contractor)

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Enterprise PKI Specialist (Fixed Term Contract) The Enterprise PKI Specialist is a senior technical specialist responsible for the design, implementation, governance, and evolution of Public Key Infrastructure (PKI) services across Qube Research & Technologies (QRT). The successful candidate will serve as the organisation's primary PKI subject matter expert, providing strategic guidance, architectural leadership, hands-on engineering expertise, and technical governance across all PKI-related initiatives. This is a highly specialised role requiring extensive experience designing, building, and modernising PKI environments within large enterprises. The successful candidate will have a proven track record of delivering PKI programmes from initial requirements gathering and architecture design through to implementation, operationalisation, and long-term governance. PKI Architecture & Delivery • Design and deliver enterprise grade PKI architecture and supporting operational model. • Design and implement root and issuing Certificate Authority (CA) hierarchies. • Define certificate policies, certificate profiles, naming standards, trust models, and operational controls. • Design resilient, highly available PKI infrastructure and supporting services. • Lead the implementation and migration of PKI platforms, tooling, and supporting infrastructure. • Define disaster recovery, backup, recovery, and key protection requirements for PKI services. • Design and oversee Hardware Security Module (HSM) integration and key management processes. • Establish operational procedures for certificate issuance, renewal, revocation, recovery, and lifecycle management. • Ensure solutions are scalable, supportable, and aligned with security and regulatory requirements. PKI Subject Matter Expertise • Act as the organisation's recognised PKI authority and trusted advisor. • Provide expert guidance on certificate authority design, trust models, certificate lifecycle management, revocation strategies, and key protection. • Advise engineering and platform teams on PKI integration requirements and best practices. • Review proposed solutions and ensure alignment with established PKI standards and architectural principles. • Provide technical leadership for complex PKI-related initiatives and problem resolution. Machine Identity & Certificate Lifecycle Management • Develop enterprise approaches for managing machine identities at scale. • Design and implement automated certificate issuance, renewal, rotation, and revocation processes. • Support certificate management across infrastructure, cloud, container, networking, and application environments. • Reduce operational risk associated with certificate expiry and trust failures. • Define standards for certificate discovery, inventory, monitoring, and reporting. Stakeholder Engagement & Governance • Work closely with infrastructure, engineering, cloud, security, risk, and operational teams. • Translate complex PKI and cryptographic concepts into clear business and technical recommendations. • Develop PKI standards, policies, procedures, and governance documentation. • Support audits and regulatory reviews relating to cryptographic and PKI controls. • Influence technical direction and ensure PKI considerations are embedded within strategic initiatives. Essential Skills & Experience • Proven experience designing and delivering enterprise PKI environments from inception through production operation. • Extensive experience designing Root CA, Intermediate CA, and Issuing CA architectures. • 10+ years of experience working with enterprise PKI, trust services, or cryptographic infrastructure. • Strong understanding of offline Root CA designs, trust hierarchy models, certificate policy development, and PKI governance. • Experience implementing and operating HSM-backed PKI environments. • Deep knowledge of X.509 certificates, PKCS standards, CRLs, OCSP, certificate validation, and trust chains. • Proven experience leading PKI programmes or transformations across multiple organisations. • Ability to engage effectively with senior stakeholders, architects, engineers, auditors, and operational teams. Desirable Skills & Experience • Experience with Venafi, Keyfactor, DigiCert Trust Lifecycle Manager, Sectigo, EJBCA, HashiCorp Vault, or equivalent platforms. • Experience with Microsoft Active Directory Certificate Services (AD CS) design and migration programmes. • Experience implementing PKI within AWS, Azure, Kubernetes, and hybrid cloud environments. • Experience supporting financial services, regulated industries, or large-scale enterprise environments. • Relevant industry certifications in security, architecture, cloud, or cryptography. Contract Details • Fixed Term Contract • Hybrid working model • London-based role • Competitive package dependent on experience