Principal Software Engineer - Customer Platforms

Team
Digital & Tech
Store
London Support Office
Location
London, Greater London
Contract type
Permanent
Position type
Full Time
Salary
Competitive + Benefits
Closing date: 31st July 2026
Apply now

How We Hire

Everyone is welcome at M&S. No exceptions. It’s your background, abilities and differences that make you, uniquely you. And when you’re part of M&S, that individuality has the potential to make waves.

About the role

This section tells you all you need to know about the position and its responsibilities, outlining everything we hope to see in a successful candidate.

All the details

Job purpose

As part of the M&S Software Engineering team, you’ll be joining a well-loved historic brand, working on solutions that serves millions of loyal customers and thousands of colleagues! With ethical values that run right through the company’s core and technology leaders that truly understand software engineers and engineering, it’s an exciting time as we’re redefining ourselves into a digital first and engineering-led organisation, with the quality of our engineering team being a key differentiator.

We are seeking a passionate Principal Software Engineer to join us working across our Customer Platform team at M&S, where you will be a driving force behind the modernisation of mission-critical systems for M&S, as we scale. As a technical leader, you will be collaborating with multiple cross-functional teams to design, build, and maintain the software that powers our warehouse operations.

Reports to

Senior Head of Software Engineering

What You'll Do:

  • The Principal Software Engineer role is the embodiment of ‘solving problems through technology’ with key responsibilities as follows:
  • Lead technical excellence from design to operations and launch of core product features or strategic programmes
  • Drive technical direction and influence our overall strategy informing decisions on both Technology and Product investments as well as teams’ setup
  • Champion Communities of Practice to help establish engineering excellence at M&S
  • Lead by example via contributions to our engineering ecosystem
  • Pioneer and promote methodologies like clean code and clean architecture
  • Advocate for engineering productivity, delivery quality and operational excellence through a continuous ecosystem
  • Drive DevOps practices to automate the Product development life cycle and ownership demeanour
  • Partner with both Engineering, Technology and Product leadership to ensure strategies align
  • Develop the best and mentor other senior engineering roles across the entire landscape
  • Promote effective innovation across all of engineering
  • Advocate and strategize for continuous industrialisation and product-minded tech capabilities
  • Inspire ideas to foster purpose and mastery to engineering teams, leading them towards autonomy and maturity
  • Amplify engineering teams by efficiently unblocking them with direction, leading upward, and establishing alignment
  • Raise the profile of MS Tech through public content and contribution/creation into open-source technology
  • Support recruitment, onboarding and internal and external brand outreach activities

Who You Are:

  • Significant track record of strategic and innovative thinking, as well as execution and implementation
  • Specialist in clean code and implementation of design patterns for common problems.
  • Depth of knowledge in Information Security, you can design, quality review and quality assure solutions and services with security controls embedded.
  • Confident driving system design conversations, building systems characterised by high levels of risk, impact, and business or technical complexity
  • Able to analyse current processes, identify, and implement opportunities to optimise processes, and lead and develop a team of specialists to deliver service improvements
  • Experience of using a variety of methods of prototyping. You know how to share methodologies and can mentor others. You look at strategic service design end to end
  • Strong ability to influence industry-based models for the development of new technology applications. You develop effective implementation and procurement strategies, consistent with business needs. You ensure alignment to relevant technical strategies, policies, standards, and practices
  • Strong understanding of quality assurance, testing quadrants and the testing pyramid, and how to apply them
  • Ability to lead senior engineers and technical customers to a desired outcome, without prescribing it
  • Authoritative skills at cloud computing (network, security, serverless, Kubernetes etc) and automation
  • Experience with implementation of Observability and Reliability using market technologies (e.g.: New Relic)
  • Good experience with Performance Engineering (load testing, derivations, tuning, core web vitals, page speed etc.)
  • Expertise in reliability testing
  • Able to influence people at senior levels and from the highly technical to non-technical

Desirable experience

  • Previous software engineering community leadership experience
  • Professional presentation delivery at internal and external events
  • An ambition to be an open-source contributor, technology writer or speaker
  • Advocate and experience of Continuous Integration and Continuous Delivery
  • Advanced experience of DevOps: you build it, you run it
  • Cares about the business and the bigger picture with significant prior examples
  • Excellent communication skills, both written and spoken and able to adjust for different audiences
  • A senior leadership mentality that is willing to take ownership.
  • Demonstrable entrepreneurship in previous organisation(s)

Tech Stack

M&S uses a variety of technologies including;

  • Java, Spring, SpringBOOT, Micronaut
  • React, Next.js, Typescript, Angular
  • Azure Cloud, Kubernetes, Dynatrace (observability)
  • SQL Server, MongoDB
  • Ignite, Redis

What’s In It For You

Working at M&S means being part of something bigger - helping to deliver quality, value and service to millions of customers every day. We’re inclusive, fast-moving and always evolving, with a strong sense of purpose and a focus on doing the right thing.

Here are just a few of the benefits that make working here even more rewarding:

  • 20% colleague discount on all M&S products and many third-party brands for you and someone in your household, available once you’ve completed your probation
  • Competitive holiday allowance with the option to buy more
  • Discretionary bonus schemes linked to your performance and ours
  • Strong pension and life assurance to help plan for the future
  • Tailored induction and training to support your development from day one
  • Exclusive perks and savings through our M&S Choices portal
  • Market-leading family policies, including parental, adoption and neonatal leave
  • 24/7 wellbeing support, including virtual GP access and mental health services
  • One paid volunteer day a year to support a cause that matters to you

#LI-Hybrid #LI-PJ1

Meet the Team

digital_thumbnail.jpg
A group of colleagues gathered around a table, smiling and discussing work with laptops open in a modern office setting.

Being an in-person business

We're at our best when we're close to customers, and for many of us at M&S, that means working in store every day.

To stay close to customers, our support teams are in the office three days a week as we believe that skills are developed through collaboration, and that spending time together makes us more creative and connected. It also means we can solve problems as soon as they arise, learn and grow as a team, build trust, and get closer to our colleagues.

Click to skip quote slider carousel
Deepak Data Scientist
Janak Staff iOS Engineer
Halford Head of Technical Program Management

At M&S, we have Data Scientists, Analysts, and Technical Product Managers, who all share a genuine passion for harnessing data to improve people’s lives. And we’re in a unique position where we can actually help many different kinds of people, from our customers to our colleagues in store and in our support centre.

Deepak (He / Him) | Data Scientist Read full story

I think all engineers just love solving puzzles and problems. At M&S, we’re constantly learning new things, whether it’s mastering Swift UI or understanding how customers interact with technology. But this is also a business that listens to engineers and values what we bring to the table. That’s different, believe me.

Janak (He / Him) | Staff iOS Engineer Read full story

Being in third-party brands, working on things M&S hasn’t done before… that plays to my sweet spot. I’ve worked in many organisations throughout my career, and it’s rare to see such cause and effect in your work. The way we’re structured means you’re encouraged to solve problems and you have the autonomy to make progress quickly.

Halford (He / Him) | Head of Technical Program Management Read full story

Make Your Mark

Upcoming projects

Take part in our M&S Digital & Tech team days. Grow your digital and data skills through our BEAM Academy. Or challenge yourself at one of our business-wide hackathons. We also partner with Women in Data, Databricks and Cajigo to increase opportunities for women in digital and data.

Opportunities to be heard

Your voice and your ideas matter here. Our 8 colleague networks are places to find support, listen to each other and encourage debate. You can pitch ideas ‘Straight to Stuart’, our CEO, or get involved in our BIG (Business involvement Group).

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Colleague Networks

We want you to feel supported, no matter what.

LGBTQ+ Network

Proactively representing LGBTQ+ issues and opportunities to deliver a truly inclusive place to work and shop for our colleagues and customers.

Cancer Network

Fostering a supportive and inclusive workplace culture, addressing stigma, providing guidance and raising awareness to empower and assist colleagues affected by cancer.

Culture and Heritage Network

Raising awareness of various religions and cultures through events and comms, to educate others and better represent our M&S colleagues and customers.

Family & Carers Network

A support network for parents and carers, offering a space for colleagues to share experiences, exchange ideas, and access useful resources.

Forces Community Network

Supporting colleagues connected to the Armed Forces, aiding their transition to civilian life, and ensuring that they thrive in the workplace.

Gender Equality Network

Addressing gender-related challenges, raising awareness, and driving action to ensure equal opportunities for all.

Menopause Network

Initiating and encouraging open conversations about menopause by offering support and sharing experiences.

Health and Wellbeing Network

Providing a safe space for colleagues with all types of health conditions or disabilities and supporting with business initiatives to ensure our stores are truly accessible for our customers.

Benefits

How to Apply

Here’s what to expect at each stage of the application process. This can change depending on the role you’ve applied to. If you need any reasonable adjustments made at any stage, let us know and we can help.

Send us your application

Fill in our short application form and hit submit.

Online assessment

Depending on the role you are applying for, you may be invited to do an assessment. Your Talent Acquisition Partner will guide and inform you along the way.

Interview

We'll invite you to join us for an interview. This could be remote or in person. Here, we'll ask you some role based technical questions and examine the behaviours we're looking for. 

Decision

After we’ve made our decision, we’ll be in touch. If you’ve been successful, we’ll officially invite you to join the team and let you know the next steps.

Principal Software Engineer - Customer Platforms

Team
Digital & Tech
Store
London Support Office
Location
London, Greater London
Contract type
Permanent
Position type
Full Time
Salary
Competitive + Benefits
Closing date: 31st July 2026
Reference: 121537