Security Engineer - Detection Engineering


Company:	Tesco
Salary:	Competitive
Hours:	Part-time
Location:	Welwyn Garden City, AL7 1GA
Job type:	Permanent
Posting date:	8 Sept 2026
Closing date:	7 Oct 2026

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Summary

About the role

As a Security Engineer within Tesco’s Detection Engineering team, you will design and implement advanced security monitoring capabilities that proactively protect a global retail ecosystem serving millions of customers. This role is central to evolving Tesco’s cyber defence posture by deploying scalable, detection and prevention solutions. You will bridge foundational engineering, emerging architecture, embedding automation, innovation, and resilience into the organisation’s security fabric. Operating with a strong engineering mindset, you will help ensure threats are identified and mitigated before they impact customers or operations.

You will be responsible for

• Engineer and deploy robust security controls and detection logic to proactively identify and mitigate cyber threats across Tesco’s technology landscape.

• Apply secure, test-driven development principles to build resilient, maintainable, and scalable security solutions.

• Leverage automation and Applied Artificial Intelligence (AI) to enhance detection accuracy, reduce false positives, and optimise response workflows.

• Contribute to the hardening of cloud and enterprise environments through innovative detection and prevention mechanisms.

• Work closely with Security Operations Centre (SOC), Threat Intelligence, and platform engineering teams to deliver integrated, customer-first security outcomes.

• Actively learn from incidents, research emerging threats, and translate insights into improved detection coverage and engineering practices, fostering an inclusive and innovative team culture.

You will need

• Demonstrable understanding of software development lifecycles, with hands-on exposure to programming and building production-grade solutions.

• Experience applying secure coding practices and test-driven development approaches within an engineering or security context.

• Practical exposure to security platforms (e.g., Security Information and Event Management (SIEM), Endpoint Detection and Response (EDR)) and their role in detection engineering.

• Understanding of how custom detection rules, alerts, and telemetry are designed, tested, and implemented to identify malicious activity at scale. Able to reduce noise without impacting visibility, and to sustain detection quality over time,

• Evidence of strong curiosity and commitment to professional development, staying current with evolving threats and technologies.

• Ability to work effectively within diverse, cross-functional teams, contributing to an inclusive and supportive engineering environment.

• Solid critical thinking capability, with the ability to break down complex problems and deliver practical, scalable solutions.

Desirable:

• Exposure to core technology platforms and retail technology environments.

• Understanding of cloud and container security principles.

• Experience in security evaluation, functionality testing, and validation of controls.

• Familiarity with Applied Artificial Intelligence (AI) concepts in cyber defence.

• Experience using tools such as Github, Jira, Zendesk, and xMatters for engineering workflow and operational collaboration.

• Experience with a querying language such as SPL, KQL, SQL, etc. In a Security Environment.

• Strong communication and influencing skills within technical teams.

• Awareness of product methodologies and agile delivery approaches.

• Exposure to technical security architecture concepts and data analytics for security.

• Understanding of responsible AI governance and compliance principles.

What’s in it for you?

We’re all about the little helps. That’s why we make sure our Tesco colleague benefits package takes care of you – both in and out of work. [1] Click Here to find out more!

• 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 (12 months service required at the qualifying date) 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.

The above information is a shortened summary, refer to our policies for full details

References

Visible links

1. https://www.tesco-careers.com/explore-our-world/colleague-benefits/

About Us

You might know us as a supermarket, technology company or even for our award-winning mobile network. Truth is, we’re all of those things, and much more. Our colleagues work with one goal in mind, helping to make every day a little better for our customers, colleagues and communities all over the world. No two customers are the same, neither are our colleagues.

At Tesco, we champion a balance that lets you thrive both in and out of work. Spend 60% of your week collaborating with colleagues at our office locations or local sites and the rest remotely. Whether you’re just kicking off your career, juggling passions, or navigating big life events, we’re here to support you. We always welcome a conversation about flexible working, so talk to us throughout your application about how we can support.

We’re proud to be an accredited Disability Confident Leader, where everyone’s welcome. That’s why we commit to providing a fully inclusive and accessible recruitment process. If you need support with your application, [1] click here  for more information. And if you’re interested in joining our team but don’t tick every box, don’t let that hold you back from applying.

References

Visible links

1. https://www.tesco.com/careers/en-GB/accessibility>

About us

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

Should you be successful in your application, your offer will be subject to and conditional upon you providing your bank account details before your agreed start date.

For more information about us please visit www.tescoplc.com

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