Principal Software Engineer SC&L
- Team
- Digital & Tech
- Store
- London Support Office
- Location
- London, Greater London
- Contract type
- Permanent
- Position type
- Full Time
- Salary
- Competitive + Benefits
- Closing date: 14th July 2026
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.
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.
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 Supply Chain & Logistics 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. Your expertise will help us create a best-in-class engineering environment while ensuring our systems are robust, scalable, and reusable across our multiple warehouses.
Reports to
Senior Head of Software Engineering
M&S peers
Heads of Software Engineering, Heads of Product, Senior Technical Programme Managers, Principal Architects
Key Accountabilities & Responsibilities
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
Tech Stack
M&S uses a variety of technologies across Supply Chain & Logistics and, as part of our modernization drive, will be introducing new ones. The sorts of technologies include:
Java, Micronaut, PL/SQL
ReactJS, Next.js
Azure Cloud, Dynatrace (observability)
Mule, Kafka, MQ
Blue Yonder Dispatcher
Essential Experience
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.: Dynatrace)
Advocate and experience of Continuous Integration and Continuous Delivery
Advanced experience of DevOps: you build it, you run it
Good experience with Performance Engineering (load testing, derivations, tuning, core web vitals, page speed etc.)
Expertise in reliability testing
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.
Able to influence people at senior levels and from the highly technical to non-technical
Desirable experience
Experience of the Retail domain and/or Supply Chain & Logistics, particularly around Warehouse Management Systems and Warehouse Control Systems
Previous software engineering community leadership experience
Professional presentation delivery at internal and external events
Demonstrable entrepreneurship in previous organisation(s)
Works closely with
You’ll be working closely with other Principal Software Engineers, Heads of Software Engineering, Heads of Product, Commercial, Finance, CTOs, Software Engineering Managers, Software Engineers, and Product Managers to collaboratively address problems. There will be day-to-day interactions with Technical Programme Managers, who you’ll work with to constantly evolve your team’s ways of working. Depending on your team(s), you could also interact with other specialists such as Architects, Data Scientists, UX/UI Designers, and analytics authorities.
As a member of M&S Software Engineering, you’ll also have the opportunity to work with and learn from other engineers and specialists in the organisation through Business Platforms, Product Portfolios, Product Groups, other teams and Communities of Practice.
M&S is ready to push boundaries to lead the industry into a greener, speedier, more inspiring digital era. That’s why we’re revolutionising how we work and offering our most exciting opportunities yet! There’s never been a better time to be part of our team. Marks & Spencer aims to be an inclusive organisation, trusted and admired by our colleagues, customers and suppliers. Join us and make an immediate impact. We are committed to an active Inclusion, Diversity and Equal Opportunities Policy, which starts with our recruitment and selection process, and we are happy to talk flexible working. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process. If you consider yourself to have a disability or learning difficulty which means you are unable to complete the application process online, please get in touch either by phone on 0345 300 3725 or by email recruitment.online@marksandspencer.com so we can make alternative arrangements for you.
#LI-NO1 #LI-Hybrid
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.
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.
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).
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.
Fill in our short application form and hit submit.
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.
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.
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.