Interim Quantum / Cryptography Specialist

Who We Are

At Grant Thornton we’re building something bold. We’re doing things differently - looking to the future, driving ambitious growth and pioneering positive change in our industry. Providing audit, tax and advisory services, we empower clients through strategic insight, curiosity, and genuine partnership. And we empower our people with real opportunity. Our journey from great to exceptional is well underway. With significant investment behind us and a clear strategy for growth, there’s real momentum.

Our Agile Talent Community (ATC) brings together experienced contract professionals who want choice without losing connection. You work where you add the most value, alongside teams who treat you as a partner rather than a placeholder.

Assignment Description:

Interim Quantum / Cryptography Specialist (UK wide, Hybrid-working)

Grant Thornton's Cyber Advisory team is rebuilding and growing its talent pool to support a strengthening pipeline of client work spanning cyber maturity assessments, governance and controls, third-party risk and emerging technology advisory. We’re looking for experienced cyber professionals to join our Agile Talent Community and deliver Grant Thornton-led advisory engagements for clients across financial services and beyond.

If you’re a cryptography specialist with a genuine quantum-readiness background, you’ll help our clients understand where current cryptographic standards break down under quantum computing and advise on their post-quantum cryptography (PQC) migration roadmap — from crypto inventory and discovery through prioritisation and transition planning. You’ll be equally comfortable translating a highly technical subject into a board-level narrative.

Skills We Are Looking For

• Cryptography background, with a clear understanding of where current cryptographic standards break under quantum computing
• Experience building or advising on a PQC migration roadmap: crypto inventory/discovery, prioritisation and transition planning
• Able to translate a highly technical subject into a board-level narrative and plan
• Awareness of emerging standards (NIST PQC, CNSA 2.0) and vendor tooling in this space
• Relevant cryptography/security certification or academic background preferred; NCSC or industry quantum-readiness experience a strong plus

Why Consultants choose the ATC

Work that moves you forward

When a project fits your skills, we’ll get in touch, but you choose whether it’s right for you. That means working on engagements that genuinely build your portfolio and expand your expertise.

The freedom of contracting without the hidden admin

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Community you can actually feel

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Our culture and values

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Our open and accessible culture means you’ll interact with leaders who are interested in you and everything you bring to our firm. The things that set you apart, we value them. That’s why we give you the freedom to bring your whole self to work and pursue your passions inside and outside of work.

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