Job Description

Tesco UK o Welwyn Garden City o Hybrid o Full-Time o Apply by 03-Oct-2025



About the role



As a Cyber Security Detection Engineer, you will lead the development, implementation, and continuous improvement of Tesco's cyber security detection capability. You will be required to understand the changing threat landscape, see opportunities for improvement in existing detections, establish new detections, and ensure appropriate detection coverage for the organisation. You will work closely with multiple teams, including security operations, engineering, and risk & compliance, in a fast paced and agile environment.



What is in it for you



We offer excellent benefits that help make Tesco a great place to work. These include but aren't limited to: An annual bonus scheme which you can achieve up to 20% of base salary Colleague Clubcard (including a 2nd card for a family member) after 6 months service with 10% off most purchases at Tesco Holiday starting at 25 days plus a personal day A retirement savings plan - 4%-7.5% contribution rate Life Assurance - 5 x contractual pay Buy As You Earn Scheme Save As You Earn Scheme Deals & Discounts through Tesco including Tesco Mobile & Tesco Bank Deals and Discounts through many other external businesses



You will be responsible for



Responsible for developing and driving the cyber security detection capability both day-to-day and strategically for the Tesco Group. You are expected to seek out effective and comprehensive detection logic and capability, ensuring detections are robust and not brittle, thoroughly tested, and that alerts and supporting information is available to and understood by operational cyber security teams.



You are expected to put the needs of operational teams and incident responders at the centre of your development work, ensuring detections and alerts are relevant, of value, and have practical response steps. You will need to ensure detection capability is fit for both on-premises, private and public cloud environments, working at significant scale, and across a diverse range of asset types.



In addition, you may provide support during cyber security incidents, participate in threat hunts, and work with other security teams to deliver automation and standardisation to improve efficiency and response.



You will need



Security Engineering Skills

Threat Led:

Ability to assess and validate information from various sources on cyber and

informational security threats to business

Ability to analyse and identify significance of processed intelligence to identify trends,

threat actor TTPs and potential capabilities.

Ability to break down and translate information into tangible actionable data.

Secure & Test-Driven Engineering

Understanding of cyber security threat frameworks such as MITRE ATT&CK, Lockheed

Martin Killchain etc.

Ability to specify/implement processes to maintain required level of security for a

component/product/system during its lifecycle.

Proficient at detection development lifecycle covering all reasonable positive and

negative test cases.

Ability to conducts code reviews of existing content and processes to identify and

enhance or mitigate security issues.

Contribute to security evaluation of or testing of threat/vulnerabilities faced by

systems.

Applies recognised evaluation/testing methodologies, tools and techniques to

signature development / reviews, suggesting new ones where appropriate.

Research:

Ability to quantify and define research goals to generate worthwhile relevant detection

ideas for further testing and exploration.

Ability to summarise findings or technical information to be disseminated with wider

teams, factoring in business knowledge and summaries.

Experience relevant for this role:

An ability to develop queries and enable robust detection of threats. Working knowledge of Windows, macOS or Linux operating systems Ability to work independently as well as part of a team. Understanding of modern attacker TTPs Translate threat intelligence into actionable detection logic. Solid grasp of detection technologies A broad understanding of security concepts; an interest and passion for cyber security An analytical approach; ability in problem solving and comfortable working on

production systems at scale.

Query languages such as KQL or SPL Experience developing and maintaining basic automation scripts (e.g., Bash, Python,

Batch, PowerShell etc.)

Desirable Skills and Experience:

Knowledge of cloud infrastructure, cloud security and cloud APIs a plus Knowledge of attacker tools and evasion techniques within offensive engineering Working knowledge of at least one major programming language, including scripting

languages like Python and PowerShell

Experience of developing detections as code

About us



Our vision at Tesco is to become every customer's favourite way to shop, whether they are at home or out on the move. Our core purpose is'Serving our customers, communities and planet a little better every day'. Serving means more than a transactional relationship with our customers. It means acting as a responsible and sustainable business for all stakeholders, for the communities we are part of and for the planet. Diversity, equity and inclusion (DE&I) at Tesco means that whoever you are and whatever your background, we always want you to feel represented and that you can be yourself at work. In short, we're a place where Everyone's Welcome. We're proud to have been accredited Disability Confident Leader and we're committed to providing a fully inclusive and accessible recruitment process. We're a big business and we can offer a range of diverse full-time & part-time working patterns across our many business areas, which means that we can find something that works for you. We work in a more blended pattern -combining office and remote working. Our offices will continue to be where we connect, collaborate and innovate.



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