PQC Technical Lead

LSEG; Greater London; On-site; GBP 110,000 - 165,000; Full time

Job summary

LSEG (London Stock Exchange Group) seeks a senior security architect/consultant to lead PQC programme delivery planning. This role translates NCSC expectations into actionable implementation plans and guides engineering teams through migrations with minimal risk.

You will develop roadmaps, assess cryptographic dependencies, and produce executive-ready updates, while engaging stakeholders across cloud, on‑premise, networks and PKI.

Qualifications

• Extensive experience as a senior security architect in a large enterprise.
• Delivery experience leading complex security or infrastructure programmes.
• Strong understanding of PKI, TLS and cryptographic protocols.

Responsibilities

• Act as the organisation's technical lead for PQC and cryptographic agility.
• Build practical migration plans aligned to milestones and business priorities.
• Lead discovery of cryptographic dependencies across applications, infrastructure, cloud, networks and PKI.
• Identify quantum-vulnerable technologies and prioritise remediation using a risk-based approach.
• Create reusable migration patterns, reference architectures and playbooks.
• Define how common scenarios will migrate (certificates, TLS, auth, signatures, VPN, key management).
• Assess vendor readiness and challenge roadmaps with TPRM teams.
• Support engineering through design reviews, pilots and decisions.
• Produce executive-ready updates and risk assessments.
• Explain complex issues to governance forums.

Skills

Security architecture

Programme delivery

NCSC guidance

PKI and certificate management

TLS and cryptography

Cloud and hybrid infrastructure

Stakeholder management

Documentation

Strategic roadmapping

Influencing without authority

Education

Bachelor's degree in a relevant field

Tools

PKI tooling

HSMs

Security architecture tooling

Job description

ABOUT US:

LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It's how we've contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services - and our open-access model - we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.

LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific. LSEG's ticker symbol is LSEG.

OUR PEOPLE:

People are at the heart of what we do and drive the success of our business. Our culture of connecting, creating opportunity and delivering excellence shape how we think, how we do things and how we help our people fulfil their potential. We embrace diversity and actively seek to attract individuals with unique backgrounds and perspectives. We break down barriers and encourage teamwork, enabling innovation and rapid development of solutions that make a difference. Our workplace generates an enriching and rewarding experience for our people and customers alike. Our vision is to build an inclusive culture in which everyone feels encouraged to fulfil their potential.

We know that real personal growth cannot be achieved by simply climbing a career ladder - which is why we encourage and enable a wealth of avenues and interesting opportunities for everyone to broaden and deepen their skills and expertise. As a global organisation spanning 70 countries and one rooted in a culture of growth, opportunity, diversity and innovation, LSEG is a place where everyone can grow, develop and fulfil your potential with meaningful careers.

ROLE SUMMARY:

We are seeking a senior consultant to lead the practical delivery planning for the organisation's Post-Quantum Cryptography (PQC) programme.

This is not a research role. We require an experienced security architect who can translate NCSC expectations into actionable implementation plans, identify what needs to change across a complex technology estate, and provide clear direction to engineering teams responsible for delivery.

The consultant will be expected to develop realistic roadmaps, migration patterns, prioritisation approaches and technical guidance that enable delivery teams to execute PQC migrations with minimal operational risk.

WHAT YOU'LL BE DOING:

• 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.

WHAT YOU'LL BRING:

• 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:

• Previous PQC or crypto-agility programme experience.
• Financial services or critical national infrastructure experience.
• Experience working with large application portfolios and customer-facing platforms.
• Familiarity with NCSC and NIST PQC guidance.

Expected Deliverables:

• Enterprise PQC strategy and roadmap.
• Cryptographic discovery and dependency assessment