Senior Software Engineer - Personalisation

We’re looking for a Senior Software Engineer within the Personalised Search team to play a pivotal role in evolving M&S’s Identity Platform. This team provides the critical software capabilities that power authentication, authorisation, and identity management across M&S digital channels, enabling secure and seamless experiences for millions of customers and thousands of colleagues.

Your “customers” are product teams, engineers, business stakeholders, and millions of M&S customers and colleagues and your mission is to enable them through secure, scalable platforms, resilient services, and exceptional engineering practices.

This is a role for an engineer who is excited by building large-scale identity solutions, modernising authentication platforms, and delivering secure digital experiences that sit at the heart of every customer and colleague interaction with M&S.

About the Team

Our engineering teams enable product, engineering, and business teams to build and deliver digital experiences with speed and confidence. We create reliable, scalable, and secure platforms rooted in strong engineering standards, automation, and continuous improvement.

You will join the Identity Platform team, responsible for the services and capabilities that manage authentication, authorisation, and user identity across the M&S ecosystem.

What You'll Do

Your key accountabilities will include:

• Design, build, and evolve secure, scalable, and high-performance authentication and identity services used by millions of customers and colleagues.
• Own features end-to-end, taking responsibility for solution design, development, testing, deployment, monitoring, and production support.
• Help shape the technical direction of the Identity Platform, balancing customer experience, security, performance, and developer usability.
• Develop resilient APIs and backend services that enable secure authentication, authorisation, and identity management capabilities across the organisation.
• Champion engineering excellence through clean, maintainable, and well-tested code, helping establish best practices across teams.
• Actively participate in code reviews, technical discussions, pair programming, and knowledge-sharing initiatives.

Who You Are

• A senior software engineer with significant experience building and operating large-scale distributed systems serving millions of users.
• Strong experience with Java and/or Kotlin and modern backend development frameworks.
• in designing and delivering secure, scalable services within cloud-native environments.
• Strong understanding of DevOps principles, CI/CD pipelines, automation, and operational ownership.
• Comfortable designing systems that balance security, usability, resilience, and performance.
• Experience with identity and access management technologies, OAuth 2.0, OpenID Connect, or similar authentication standards is highly desirable.

What’s in it for you

Being a part of M&S is exactly that – playing your part to bring the magic of M&S to our customers every day. We’re an inclusive, dynamic, exciting, and ever-evolving business built on doing the right thing and bringing exceptional quality, value, service to every customer, whenever, wherever, and however they want to shop with us.

Here are some of the benefits we offer that make working for M&S just that little bit more special.

• After completing your probationary period, you’ll receive 20% colleague discount across all M&S products and many of our third-party brands for you and a member of your household.
• Competitive holiday entitlement with the potential to buy extra holiday days.
• Discretionary bonus schemes awarded based on how you achieve your personal objectives and our performance as a business.
• A generous Defined Contribution Pension Scheme and Life Assurance.
• A dedicated welcome to our teams with a tailored induction and a wide range of training programmes to develop your skills.
• Amazing perks and discounts via our M&S Choices portal to maximise your financial and personal wellbeing.
• Industry-leading parental, adoption and neonatal policies, providing support and flexibility for your family.
• Access to a fantastic range of wellbeing support for all colleagues including access to our 24/7 Virtual GP and PAM Assist to support you and your family.
• A charity volunteer day to support a charity or cause you're passionate about through a dedicated day away from work.

Everyone’s Welcome

We are ambitious about the future of retail. We’re disrupting, innovating, and leading the industry into a more conscientious, inspiring digital era. We’re transforming how we work together and offering our most exciting opportunities yet.

Marks & Spencer strives to be an inclusive organisation, trusted and admired by our colleagues, customers, and suppliers.

We are committed to building diverse and representative teams, where everyone can bring their whole selves to work and be at their best. We support each other and win together.

If you’d benefit from any support or reasonable adjustments during any stage of the recruitment process, please let us know when completing your application.

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