> Markdown version of [/jobs/ext/3856886-senior-software-engineer](https://www.wearedevelopers.com/jobs/ext/3856886-senior-software-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Software Engineer

- **Company:** Marks and Spencer plc (UK)
- **Location:** UK
- **Experience:** Expert
- **Salary:** £56,536.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Cloud Computing, Code Review, Continuous Integration, DevOps, Distributed Systems, Identity and Access Management, OAuth, Pair Programming, Openid Connect, Backend, Kotlin
- **Published:** October 22, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5936496018

## About the Role

* 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.

## Description

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.