Could Security Engineer (AWS or Azure) Tesco Mobile

As a Cloud Security Engineer within the Run & Operate Chapter, you'll join our DevSecOps Squad, working alongside DevOps engineers, platform specialists, and the Cyber Security Team. Your mission: to secure and optimise our cloud platforms across Azure and AWS, embedding robust security practices into everything we build and operate.

This is a hands-on role where you'll define cloud security standards, drive improvements, validate infrastructure changes, and strengthen our detection and response capabilities. Your work will directly influence how we protect our services, customers, and engineering systems.

You will be responsible for

You will play a key role in securing and maturing Tesco Mobile's cloud environments (Azure and AWS):

• Define, maintain, and evolve cloud infrastructure security standards across AWS and Azure
• Act as a subject-matter expert on cloud and infrastructure security
• Lead and deliver cloud security improvement initiatives and posture management work

Operational Cloud Security

• Use services like Azure Security Center/Security Hub and AWS Security Hub to monitor and enhance posture
• Identify threats, risks, and misconfigurations - and implement effective mitigation strategies
• Validate infrastructure changes to ensure they meet security and compliance requirements

Collaboration & Strategy

• Work closely with the Cyber Security Team to align on strategy, controls, and company-wide initiatives
• Communicate risk and security improvements in a clear, business-focused way
• Support containerised environments and cloud-native workloads where relevant

• Proven experience in cloud security operations with either Azure or AWS (ideally both)
• Hands-on experience with cloud security monitoring and posture management tools

• e.g., Azure Security Center, Azure Defender, AWS Security Hub

• Strong understanding of cloud governance, threat identification, and risk mitigation
• Experience integrating security controls into CI/CD pipelines
• Infrastructure as Code expertise (Terraform preferred)
• Logging/SIEM experience (e.g., Splunk, Sentinel, CloudWatch Logs)
• Automation skills using PowerShell, Azure CLI, AWS CLI, and/or Python
• Understanding of SAST, secure coding, and DevSecOps practices
• Collaborative mindset and eagerness to learn

Nice to have

• GitHub & GitHub Actions
• Experience with both AWS and Azure
• Exposure to Docker, Kubernetes, or cloud container security
• Experience creating dashboards, log ingestion or data streams in Splunk

#LI-AF2, Disability Confident About Disability Confident A Disability Confident employer will generally offer an interview to any applicant that declares they have a disability and meets the minimum criteria for the job as defined by the employer. It is important to note that in certain recruitment situations such as high-volume, seasonal and high-peak times, the employer may wish to limit the overall numbers of interviews offered to both disabled people and non-disabled people. For more details please go to .

• Annual bonus scheme of up to 20% of base salary
• Holiday starting at 25 days plus a personal day (plus Bank holidays)
• Private medical insurance
• 26 weeks maternity and adoption leave (after 1 years' service) at full pay, followed by 13 weeks of Statutory Maternity Pay or Statutory Adoption Pay, we also offer 6 weeks fully paid paternity leave
• Free 24/7 virtual GP service, Employee Assistance Programme (EAP) for you and your family, free access to a range of experts to support your mental wellbeing

Tesco Mobile is the UK's largest virtual mobile network - powered by O2 and backed by the strength of Tesco. We're known for doing things differently: award-winning customer satisfaction, a collaborative culture, and innovative digital experiences for over five million customers., Tesco has become a market leader by doing the little things that really matter for our customers and colleagues. It's part of what makes Tesco such a great place to work, and we're proud to have been accredited as one of Britain's Top Employers again this year. We're the UK's number one retailer and we pride ourselves on offering a great shopping experience. We are passionate about our food, merchandise and services and will always try to get things right for our customers. But did you know we also offer great job opportunities? With stores, distribution centres and offices across the UK, and a vast variety of roles, we are always looking for people who have a hunger to work with customers and colleagues across our exciting business. We believe in treating each other with respect and giving everyone an equal opportunity to get on. It's our people that make the difference every day - helping us make a difference for our customers