Security Software Services Specialist (PKI- Public Key Infrastructure) in Bristol

We operate a flexible hybrid working model - 3 days together in the office (Bristol), 2 days wherever works for you. However, on occasion, you may be required onsite for up to five days a week to meet business or customer needs. Please note: Eligibility for UK Security Clearance at the required level is essential for this role. You must have this clearance in place before you can start.

Why this job matters

Public Key Infrastructure (PKI) is central to how we protect our organisation, our people, and the millions of customers who rely on our services. In this role, you will strengthen BT's security posture by ensuring our cryptographic foundations remain robust, resilient, and future‑ready. You'll join a specialist security function that underpins trust across BT's digital estate, supporting critical services ranging from BACS payment systems to government and utility infrastructure. Your expertise will help maintain reliable, secure authentication across these environments, ensuring systems can verify identity and prevent impersonation or malicious activity. As security standards evolve and cyber threats become more sophisticated – particularly with the emergence of quantum technologies – your work will play a vital role in preparing BT for the next generation of cryptographic challenges, keeping our platforms secure, compliant, and ahead of emerging risks.

What you'll be doing

• Designing and maintaining our core PKI services – the digital identity layer that keeps BT secure.
• Making sure we meet key security standards (like NIST and ISO) and preparing for future risks such as quantum‑safe cryptography.
• Managing certificate lifecycles, fixing issues quickly, and improving automation to keep services resilient.
• Giving clear, practical advice to engineers, architects, and security teams.
• Supporting audits and assurance activity to maintain trust in our systems.
• Working in a security‑cleared environment, handling sensitive systems responsibly.
• Helping shape the future of BT's cryptographic strategy.

The skills you'll need

• Hands-on experience managing enterprise PKI environments, including certificate authorities, HSMs, and associated tooling.
• Familiarity with NIST and ISO frameworks, and awareness of quantum‑safe cryptography guidelines such as those from the EIC.
• The ability to translate complex security topics into clear, actionable guidance for technical and non‑technical stakeholders.
• A proactive approach to problem‑solving, with strong analytical skills and the ability to assess risk in a security‑critical environment.
• An understanding of security‑cleared working environments and the ability to meet the requirements needed to obtain clearance (if not already held).
• A collaborative mindset, committed to inclusive ways of working and contributing positively to a specialist security community.

Our leadership standards

• Looking in: Leading inclusively and safely. I inspire and build trust through self‑awareness, honesty and integrity.
• Owning outcomes: I take the right decisions that benefit the broader organisation.
• Looking out: Delivering for the customer. I execute brilliantly on clear priorities that add value to our customers and the wider business.
• Commercially savvy: I demonstrate strong commercial focus, bringing an external perspective to decision‑making.
• Looking to the future: Growth mindset. I experiment and identify opportunities for growth for both myself and the organisation.
• Building for the future: I build diverse future‑ready teams where all individuals can be at their best.

Benefits

• An annual bonus of up to 10% (company & personal performance dependent).
• BT Pension scheme; minimum 5% employee contribution, BT contribution 10%.
• Life Assurance.
• Exclusive colleague discounts on our latest and greatest BT broadband packages.
• 50% off EE mobile pay monthly or SIM only plans and 50% discount for friends and family on EE SIM only plans.
• BT TV, including TNT Sport and the NOW Entertainment membership, and 25% off NOW Sport, Cinema and Kids.
• Great support for working parents including pay whilst on maternity, adoptive, and paternity leave.
• Option to join the Healthcare Cash Plan or other benefits such as dental insurance, gym memberships etc.
• 25 days annual leave (not including bank holidays), increasing with service.
• Volunteering days so you can give back to your local community.
• Brand new electric vehicle salary sacrifice arrangement, known as 'My EV'.

With over 175 years of heritage, BT is now the flagship business brand of BT Group. We've brought together our best people and capabilities into a B2B powerhouse serving 1.2 million business customers internationally. We're a global leader for secure connectivity and collaboration platforms for businesses of all shapes and sizes, from big household names and government departments, right through to sole traders and start‑ups. But it's not just the technology that matters, it's what it can do to help them build stronger, smarter, more secure businesses. We value diversity and inclusion and believe in making a positive impact. We connect for good by championing digital inclusion and equipping people, businesses, and communities with digital skills to thrive. As a member of our team, you will be part of an organisation that celebrates difference, fosters innovation and provides you with opportunities to be your best. With millions of businesses relying on us daily, joining BT means you can be part of a diverse and multi‑skilled team that makes a significant impact to society.

A FEW POINTS TO NOTE

Although these roles are listed as full‑time, if you're a job share partnership, work reduced hours, or any other way of working flexibly, please still get in touch. We will also offer reasonable adjustments for the selection process if required, so please do not hesitate to inform us.

DON'T MEET EVERY SINGLE REQUIREMENT?

Studies have shown that women and people who are disabled, LGBTQ+, neurodiverse or from ethnic minority backgrounds are less likely to apply for jobs unless they meet every single qualification and criteria. We're committed to building a diverse, inclusive, and authentic workplace where everyone can be their best, so if you're excited about this role but your past experience doesn't align perfectly with every requirement on the Job Description, please apply anyway - you may just be the right candidate for this or other roles in our wider team.