Security Engineer III – Welwyn Garden City, United Kingdom of Great Britain and Northern Ireland

Overview

Senior Security Engineer in Tesco’s Innovation Engineering team shapes next-gen security capabilities for a large retail ecosystem. You combine engineering excellence with an innovation mindset to deliver AI-powered, production-ready security solutions that reduce risk and boost resilience. You’ll lead technically, set engineering direction, and collaborate across security and technology teams with a customer-first focus. The role centers on cyber threat intelligence and detection engineering, with rapid prototyping and eventual production ownership.

Pay / Benefits

• Annual bonus up to 20%
• 25 days holiday plus personal day
• Private medical insurance
• Maternity and adoption leave (26 weeks) and paternity leave
• 24/7 virtual GP service
• Employee Assistance Programme (EAP) for wellbeing

Responsibilities

• Architect and deliver high-impact security capabilities from concept to production
• Embed AI-powered security engineering with safe, explainable, operable solutions
• Lead modern engineering practices for cyber defence emphasizing automation and scalability
• Champion secure, test-driven engineering with code quality and repeatable releases
• Share knowledge to scale innovation beyond the team
• Design evaluation and testing strategies to prove effectiveness and resilience
• Influence cross-team adoption of new capabilities and foster inclusive collaboration

Key requirements

• Applied AI for cyber defence: identify high-value use cases and deliver safe outcomes
• AI architecture & implementation: design and refine AI-enabled systems
• Technical security architecture: defend design decisions and anticipate failure modes
• Strong programming capability: production-grade tools and secure engineering hygiene
• Secure & test-driven engineering: automated testing and disciplined change control
• Evaluating security solutions: define requirements, assess controls, validate under threat-informed conditions
• Understanding core cyber defence tech: telemetry, detection/response tooling, automation ecosystems
• Data analytics & insights: measure, analyze trends, prioritize work
• Strategic thinking & problem solving in ambiguous contexts
• Communication & influencing: explain complex concepts to diverse audiences
• Change leadership: modernise practices without destabilising delivery
• Curiosity and learning mindset: explore emerging tech and adversary trends
• Commitment to inclusion & belonging in engineering environments

• Communication & influencing
• Strategic thinking
• Curiosity and learning mindset
• Applied AI for cyber defence
• AI architecture and implementation
• Security architecture design and risk anticipation

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