PQC Security Architect & Roadmap Lead

London Stock Exchange Group; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Healthcare

Retirement planning

Paid volunteering days

Wellbeing initiatives

Job summary

London Stock Exchange Group (LSEG) seeks a senior consultant to lead the Post-Quantum Cryptography program. This role translates NCSC expectations into actionable plans and guides engineering teams responsible for delivery.

You will develop roadmaps, migration patterns, and risk-based prioritisation while identifying cryptographic dependencies across apps, cloud, networks, and PKI. The position requires strategic thinking and strong stakeholder engagement to drive secure, scalable outcomes.

Qualifications

• Extensive experience as a senior security architect, likely also with an engineering background, within a large enterprise environment.
• Proven delivery experience driving complex security or infrastructure transformation programmes.
• Strong understanding of PKI and certificate management, TLS and cryptographic protocols, key management and HSMs, identity and authentication platforms, cloud and hybrid infrastructure.
• Experience developing enterprise roadmaps and implementation strategies.
• Strong stakeholder management and communication skills.
• Strong documentation skills, aligning documents to intended readers.
• Ability to influence multiple technology teams without direct authority.
• Highly Desirable: PQC or crypto-agility programme experience; financial services or critical national infrastructure experience; experience with large application portfolios and customer-facing platforms; familiarity with NCSC and NIST PQC guidance.

Responsibilities

• Act as the organisation's technical lead for PQC and cryptographic agility.
• Build practical migration plans aligned to NCSC milestones and business priorities.
• Lead discovery of cryptographic dependencies across applications, infrastructure, cloud, networks, PKI and third-party services.
• Identify quantum-vulnerable technologies and prioritise remediation using a risk-based approach.
• Create reusable migration patterns, reference architectures and implementation playbooks.
• Define how common scenarios will migrate, including certificates, TLS, authentication, digital signatures, VPNs and key management.
• Assess vendor readiness and challenge supplier roadmaps where required in conjunction with our Third-Party Risk Management (TPRM) team.
• Support engineering teams through design reviews, pilots and technical decision making.
• Produce executive-ready updates, investment recommendations and risk assessments.
• Simplify complex technical issues for senior stakeholders and governance forums.

Skills

Senior security architect

Engineering background

Delivery experience

PKI management

TLS protocols

Key management

HSMs

Cloud & hybrid

Stakeholder mgmt

PQC guidance

Job description

London Stock Exchange Group (LSEG) seeks a senior consultant to lead the Post-Quantum Cryptography program. This role translates NCSC expectations into actionable plans and guides engineering teams responsible for delivery.

You will develop roadmaps, migration patterns, and risk-based prioritisation while identifying cryptographic dependencies across apps, cloud, networks, and PKI. The position requires strategic thinking and strong stakeholder engagement to drive secure, scalable outcomes.