Senior Security Engineer

Pay.UK; Greater London; On-site; GBP 85,000 - 120,000; Full time

Benefits offered by this job

12% Non-contributory pension

Discretionary annual bonus

30 days annual leave

Employee assistance programme

Cycle to Work Scheme

Season ticket loan

Fitness subsidy

Working from home policy

Job summary

Pay.UK is seeking a Senior Security Engineer (12 months FTC) to strengthen the security of UK payment systems. You will design controls, review architectures for risks, and drive remediation with engineering teams.

You’ll conduct vulnerability analyses, support incident response, and document security standards for secure delivery across cloud and on‑premise environments. The role emphasizes cross‑functional collaboration, practical security guidance, and ongoing monitoring of threats and risk.

Qualifications

• Practical experience designing security controls for infrastructure, apps and platforms.
• Knowledge of security architecture, vulnerability management and incident response.
• Experience reviewing designs to identify security risks and remediation actions.
• Experience securing cloud or hybrid environments with appropriate controls.
• Ability to document technical details and work with cross-functional teams.

Responsibilities

• Design and implement security controls that protect payment systems, platforms and supporting infrastructure.
• Review system architectures and technical designs to identify security risks and define remediation actions.
• Carry out security testing and vulnerability analysis, then prioritise and track fixes with engineering and technology teams.
• Develop and maintain security standards, engineering patterns and documentation for secure delivery.
• Support incident investigation and response activities, including technical analysis, containment and follow-up actions.
• Collaborate with engineers, architects and operational teams to embed security requirements into delivery and change processes.
• Monitor security threats, control performance and technical risk, and recommend improvements based on evidence.
• Provide practical security guidance on cloud, infrastructure, application and access control decisions.

Skills

Security controls design

Security architecture

Vulnerability management

Incident response

Cloud security

Job description

Senior Security Engineer - 12 Months FTC

Join Pay.UK as a Senior Security Engineer and help protect the systems that support everyday payments across the UK. This role provides an opportunity to put advanced security engineering skills to work in a setting where trust, reliability, and clear standards are valued every day.

You’ll work on security within the organisation that maintains and develops UK retail payment systems processing over 11 billion transactions worth over £10 trillion each year. We’re looking for someone who enjoys practical security engineering, works well with others, and can help us build secure, reliable services.

Accountabilities

• Design and implement security controls that protect payment systems, platforms and supporting infrastructure.
• Review system architectures and technical designs to identify security risks and define clear remediation actions.
• Carry out security testing and vulnerability analysis, then prioritise and track fixes with engineering and technology teams.
• Develop and maintain security standards, engineering patterns and technical documentation for secure delivery.
• Support incident investigation and response activities, including technical analysis, containment and follow-up actions.
• Collaborate with engineers, architects and operational teams to embed security requirements into delivery and change processes.
• Monitor security threats, control performance and technical risk, and recommend improvements based on evidence.
• Provide practical security guidance on cloud, infrastructure, application and access control decisions.

Qualifications, Skills and Experience

• Practical experience designing and implementing security controls for infrastructure, applications and platforms.
• Knowledge of security architecture, vulnerability management, incident response, and security control implementation.
• Experience reviewing technical designs to identify security risks and define clear remediation actions.
• Experience securing cloud or hybrid environments, including selecting and implementing appropriate security controls.
• Experience producing technical documentation and working with cross-functional technology teams to deliver secure solutions.

Pay.UK Behaviours

At Pay.UK, our behaviours are central to who we are and how we operate. They bring our values to life, shape our culture, and guide how we make decisions, collaborate, and respond to challenges across the payments ecosystem. All interview processes will assess the following behaviours:

• Listen to Find Win-Wins - Empathy, Listening and Understanding
• Influence with Courage - Influence, Courage
• Go Horizontal First - Cross Boundary Collaboration
• Take Ownership - Self Development
• Opportunity Mindset - Initiative
• Simplify - Achievement Orientation

Inclusivity

At Pay.UK, we value diversity and inclusivity. Research has shown that candidates from underrepresented groups may hesitate to apply unless they meet all the requirements listed. We encourage all qualified candidates to apply, regardless of how closely their skills and experience match the requirements. We are committed to supporting accessibility needs and creating a welcoming environment for all employees. Become part of our team and contribute to the creation of an inclusive work environment that values everyone's unique input.

Who we are

Pay.UK maintains and develops the UK retail payment systems and standards that are core to the economy being able to function on a day-to-day basis.

From Bacs to Faster Payments and cheques – we act as the single operator for all UK retail payments. We put the needs of consumers and businesses at the heart of everything we do, working in the public interest to ensure that the systems the country relies on for its banking transactions are safe, open, innovative and resilient.

Our payment systems underpin the services that enable funds to be transferred between people and institutions. In 2024, the UK's retail payment systems processed 11 billion transactions worth over £10 trillion through Bacs Direct Credit, Direct Debit, Faster Payments, and cheques, and our Current Account Switch Service has facilitated over 9 million switches since it’s launch in 2013.

Every day, individuals and businesses use the services we provide to get their salaries, pay their bills and make online and mobile banking payments. Our vision for the future is to enable a vibrant economy, with Pay.UK delivering robust payment infrastructure and standards for the benefit of consumers and businesses nationwide.

Benefits & additional information

• 12% Non-contributory pension
• Discretionary annual bonus
• 30 days annual leave (excluding bank holidays)
• Employee assistance programme
• Cycle to Work Scheme
• Season ticket loan
• Annual fitness subsidy of up to £500 per annum
• Working from home policy - minimum 40% in the office (eg. 2 days in the office over a 5 day working week)

Please note:

• Some of our benefits are only available to colleagues after meeting the requirements of the probationary period.
• Pay.UK employee benefits are not available to contractors and are only available to permanent and fixed-term employees.