PQC Technical Lead

LSEG; City Of London; On-site; GBP 90,000 - 130,000; Full time

Job summary

LSEG is seeking a senior security architect to lead the PQC programme, translating NCSC expectations into actionable migration plans. You will map dependencies across applications, infrastructure, cloud and networks, and guide engineering teams to deliver with managed risk.

Likely background in large-scale security transformations, with strong stakeholder communication and cross-team influence. This role is based in London and offers advanced cybersecurity responsibilities within a global

Qualifications

• Extensive experience as a senior security architect in a large enterprise.
• Proven delivery of complex security or infrastructure transformation programmes.
• Strong ability to manage stakeholders and communicate with senior audiences.
• Excellent documentation skills and reader-aware documentation.
• Ability to influence multiple technology teams without direct authority.

Responsibilities

• Act as technical lead for PQC and cryptographic agility.
• Build migration plans aligned to milestones and priorities.
• Lead discovery of cryptographic dependencies across apps, infra, cloud and networks.
• Identify quantum-vulnerable technologies and prioritise remediation.
• Create reusable migration patterns, reference architectures and playbooks.
• Define migration approaches for certificates, TLS, authentication, and key management.
• Assess vendor readiness with the Third-Party Risk Management team.
• Support engineering through design reviews and pilots.
• Produce executive-ready updates and risk assessments.
• Explain complex tech clearly to governance forums.

Skills

Senior security architect

Delivery leadership

Stakeholder management

Documentation skills

Cross-team influence

Tools

Cloud platforms

PKI & certificate management

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.

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 framework.
• Risk-based remediation and prioritisation model.
• Migration patterns and reference architectures.
• Vendor readiness assessments in conjunction with TPRM
• Technical implementation guidance for engineering teams.

Career Stage

Manager

London Stock Exchange Group (LSEG) Information

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.