Cloud Security Engineer AWS - Tesco Mobile

Tesco UK; Slough; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading mobile network operator in the UK is seeking a Cloud Security Engineer to enhance cloud security on AWS and Azure platforms. You will lead security improvements, integrate security tools into CI/CD pipelines, and work closely with the Cyber Security Team. This role requires a strong background in cloud security practices and experience with CI/CD processes. Flexible working arrangements are available.

Benefits

Flexible full-time and part-time options

Inclusive and diverse workplace

Agile work environment

Qualifications

• Hands-on experience with AWS cloud security.
• Proven track record of delivering cloud and SaaS security projects.
• Familiarity with CI/CD pipelines and security tooling (e.g., SAST).
• Experience with infrastructure validation, threat identification, and risk mitigation.

Responsibilities

• Lead and implement cloud security improvements across AWS and Azure.
• Utilise tools like AWS Security Hub and Azure Security Center for monitoring and security enhancement.
• Integrate security controls into CI/CD pipelines and development workflows.
• Collaborate with the Cyber Security Team and developers to embed security processes.
• Validate infrastructure changes to ensure compliance with security standards.

Skills

AWS cloud security

CI/CD pipelines and security tooling

infrastructure validation

risk mitigation

Tools

AWS Security Hub

Azure Security Center

GitHub

GitHub Actions

Splunk

IaC tools

AWS CLI

Python

PowerShell

Docker

Kubernetes

Job description

As a Cloud Security Engineer within the Run and Operate chapter at Tesco Mobile, you’ll play a key role in securing and optimising our cloud platforms—primarily AWS and Azure. You’ll help design, manage, and deploy secure solutions across various environments, maintaining a proactive programme to address evolving security priorities. Responsibilities include identifying threats and risks, implementing mitigations, and validating infrastructure changes. You’ll collaborate closely with the Cyber Security Team and your squad to embed security checks into CI/CD pipelines, strengthening our cloud security posture.

Within our DevSecOps squad, you’ll:

1. Lead and implement cloud security improvements across AWS and Azure.
2. Utilise tools like AWS Security Hub and Azure Security Center for monitoring and security enhancement.
3. Integrate security controls into CI/CD pipelines and development workflows.
4. Collaborate with the Cyber Security Team and developers to embed security processes.
5. Validate infrastructure changes to ensure compliance with security standards.
6. Serve as an expert on cloud and infrastructure security.

Must-have experience:

• Hands-on experience with AWS cloud security.
• Proven track record of delivering cloud and SaaS security projects.
• Familiarity with CI/CD pipelines and security tooling (e.g., SAST).
• Experience with infrastructure validation, threat identification, and risk mitigation.

Nice to have:

• Experience with GitHub and GitHub Actions.
• Hands-on experience with Azure cloud security.
• Familiarity with Splunk, IaC tools, and automation using AWS CLI, Python, or PowerShell.
• Exposure to containerisation (Docker, Kubernetes) and DevOps practices.

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About Tesco Mobile: a 50-50 joint venture between Tesco and VMO2, established in 2003, serving over 5 million customers as the UK's largest mobile virtual network operator. We foster an inclusive culture, emphasizing community and employee well-being.

Our approach is rooted in Agile principles—empowering teams to self-organise, collaborate, and adapt rapidly to meet customer needs. We value diversity and are committed to an accessible, inclusive workplace, accredited as a Disability Confident Leader. For accessibility support, please click here.

We offer flexible full-time and part-time working patterns across various business areas, combining office and remote work. Internal applicants should discuss flexible arrangements with their Hiring Manager. Everyone is welcome at Tesco.