Security Engineer
Salary: Competitive Plus Benefits
Location: London Store Support Centre and Home, London, EC1M 6HA
Contract type: Permanent
Business area: Sainsbury's Tech
Closing date: 25 September 2025
Requisition ID: 400017271
We’d all like amazing work to do, and real work-life balance. That’s waiting for you at Sainsbury’s. Think about the scale it takes for us to feed the nation. The level of data, transactions and variety it involves. Then you’ll realise that ours is a modern software engineering environment because it has to be. We’ve made serious investment into a Tech Academy and into setting standards and principles. We iterate, learn, experiment and push ways of working such as Agile, Scrum and XP. So you can look forward to awesome opportunities in everything from AI to reusable tech.
Location: Flexible / Hybrid
Team: Information Security
Brand: Sainsbury’s
Are you a network-savvy security engineer ready to shape the future of retail security?At Sainsbury’s, we’re not just a 150-year-old retail chain—we’re a tech-forward organisation on a transformative journey. Security is at the heart of our innovation, enabling teams to build boldly while protecting what matters most. We’re looking for a Security Engineer with a strong foundation in network security, cloud technologies, and PKI infrastructure to join our vibrant team.
What You’ll Do Network & Cloud Security Engineering• Design and implement secure network architectures across hybrid environments.
• Engineer VPN solutions and secure remote access technologies.
• Deploy and manage cloud-native security controls (Azure, AWS, GCP).
• Integrate cloud security posture management (CSPM) and workload protection platforms.
PKI & Certificate Management• Manage internal PKI infrastructure and certificate lifecycle.
• Implement certificate-based authentication for secure access.
• Collaborate on identity and access management (IAM) strategies.
Email & Web Security• Configure and maintain email security gateways (Proofpoint, Mimecast).
• Engineer web proxy and CASB solutions (e.g., Netskope) to enforce secure browsing policies.
Cross-Team Collaboration• Partner with Security Operations Centre, Analysts, and Product Managers.
• Translate business needs into secure technical solutions.
• Validate security requirements across Agile delivery pipelines.
Documentation & Risk Management• Document security processes and technical configurations.
• Identify and mitigate risks across network and cloud environments.
• Ensure compliance with architectural and design standards.
Essential Criteria:• Strong hands-on experience with network security technologies: firewalls, IDS/IPS, VPNs, SD-WAN, and encryption.
• Deep understanding of cloud security principles and architectures.
• Proficiency in PKI, certificate management, and cryptographic protocols.
• Familiarity with email and web security tools like Proofpoint, Mimecast, and Netskope.
Additional criteria:
• Agile mindset with the ability to deliver in fast-paced environments.
• Passion for learning and staying ahead of emerging security trends.
What You’ll Get in Return• Colleague discount across Sainsbury’s, Argos, and Habitat.
• Competitive holiday allowance and bonus scheme.
• Pension plan and exclusive retail offers.
• Flexible working options to support work-life balance.
Join UsBe part of a team where your skills in network and cloud security will make a real impact. Help us build a secure future for millions of customers while growing your career in a dynamic, inclusive environment.
We are committed to being a truly inclusive retailer so you’ll be welcomed whoever you are and wherever you work. Around here, there’s always the chance to try something new — whether that’s as part of an evolving team or somewhere else across the business - and we take development seriously and promise to support you. We also recognise and celebrate colleagues when they go the extra mile and, where possible, offer flexible working. When you join our team, we’ll also offer you an amazing range of benefits. Here are some of them: Starting off with colleague discount, you'll be able to save 10% on your shopping online and instore at Sainsbury's, Argos, TU and Habitat, and we regularly increase the discount to 15% at points during the year. We've also got you covered for your future with our pensions scheme and life cover. You'll also be able to share in our success as you may be eligible for a performance-related bonus of up to 10% of salary, depending on how we perform. Your wellbeing is important to us too. You'll receive an annual holiday allowance and you can buy up to an additional week's holiday. We also offer other benefits that will help your money go further such as season ticket loans, cycle to work scheme, health cash plans, salary advance (where you can access some of your pay before pay day) as well access to a great range of discounts from hundreds of other retailers. And if you ever need it there is also an employee assistance programme. Moments that matter are as important to us as they are to you which is why we give up to 26 weeks’ pay for maternity or adoption leave and up to 4 weeks’ pay for paternity leave. Please see www.sainsburys.jobs for a range of our benefits (note, length of service and eligibility criteria may apply).
