Senior Software Engineer

Job-:
Software Engineering

Location:

United Kingdom Workplace:
Hybrid

Schedule:

Full time Posted:
Closes:
Description We're looking for a Senior Software Engineer to play a pivotal role in shaping and evolving M&S's campaign personalisation and paid media platforms. This team provides the intelligent services that power personalised, performance-driven campaigns across web, mobile, and paid channels — helping millions of customers see the right message, in the right place, at the right moment, while making every pound of media spend work harder.

Your "customers" are marketing and media teams, engineers, data scientists, and ultimately millions of M&S customers. Your mission is to improve the relevance, efficiency, and measurable return of paid media and personalised campaigns through robust engineering, intelligent optimisation, and production-ready systems. This is a role for an engineer who is excited by performance marketing, personalisation at scale, and building customer-facing products that move commercial metrics.

You will help drive the next phase of growth for M&S's paid media and personalisation stack as it continues to evolve across our digital channels. Due to high interest, this role may close earlier than advertised. We recommend applying as soon as possible.

About the Team We’re building the personalisation Campaign and Paid Media engineering platform that underpins every customer touchpoint, with a true omnichannel mindset across web, app, email, push and paid social. This is a high-ownership, high-visibility Software Engineering role for an engineer who wants to shape how millions of people discover and experience M&S, through intelligent systems that acquire and engage customers and support Marketing activity.

You will join the team responsible for the platforms behind M&S's paid media and personalisation — live, customer-facing systems that combine audience intelligence with automated campaign delivery to drive relevance and return on ad spend. What You'll DoYour key accountabilities will include:
Build and evolve paid media and personalisation services using Python, supporting highly scalable, customer-facing campaign delivery.

Drive continuous improvement of paid media performance through structured experimentation, A/B testing, and data-driven insights. Build integrations with paid media platforms (paid search, paid social, programmatic/DSPs) to automate audience activation, bidding, and budget management. Work with attribution and measurement systems, identifying opportunities to improve spend efficiency and customer outcomes. Integrate campaign and personalisation services into broader digital platforms, APIs, martech, and adtech ecosystems.

Who You Are A strong software engineer with extensive Python experience delivering production-grade applications and services.

Knowledge of building performance marketing or personalisation products paid media platforms, bidding/budget optimisation, or customer-facing campaign systems. Hands-on experience designing and implementing measurement, attribution, or experimentation frameworks. Comfortable working with large-scale data and using it to drive continuous improvement in commercial metrics. Strong understanding of how to measure marketing and media performance and translate it into engineering outcomes. Comfortable taking ambiguous, fast-moving marketing challenges and translating them into practical, scalable solutions.

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,…