Top Tech Jobs & Startup Jobs in London

Lead a team of planners to optimize product availability, waste, inventory, forecasting, and supplier performance across food and hospitality. Collaborate with commercial, technical, product development, retail, and supplier teams on launches, promotions, seasonal changes, and range updates. Use RELEX and Excel to translate data into planning actions, improve distribution and store availability, and support supply chain transformation.

Design, develop, and productionise end-to-end ML and GenAI systems (retrieval, ranking, LLM components) to deliver personalised product recommendations. Build evaluation frameworks for LLM outputs, integrate them into experimentation pipelines, collaborate across Product and Engineering, and establish best practices for model development, deployment, monitoring, and continuous improvement.

The Head of Software Engineering will lead and inspire teams, driving technical excellence, innovation, and agile practices while delivering complex systems and solutions for personalisation and customer-centric environments.

Build and evolve Python services powering scalable paid media and personalization campaigns across web, mobile, email, push, and paid social. Develop integrations for audience activation, bidding, and budget management; implement experimentation, attribution, and measurement frameworks; and use large-scale data to improve marketing performance, spend efficiency, and customer outcomes.

Ownership of backend Loyalty platform services: design, build, deploy, monitor and optimise scalable, distributed systems. Collaborate across teams to shape technical direction, improve developer experience, and maintain reliability, observability and operational excellence for customer-facing Sparks journeys.

Design, build and evolve backend-focused experimentation platform capabilities (APIs, services, automation, developer tooling). Set technical direction and standards, enable a self-service model, partner with product and engineering teams, mentor engineers, and ensure production readiness with observability, resilience, and clear documentation.

Define and drive the enterprise hosting architecture strategy across cloud, datacentre and edge environments. Simplify and modernise hosting platforms to optimise cost, resilience and reuse, align product and engineering roadmaps with architecture direction, and lead governance, standards and major transformation programmes.

Lead end-to-end financial services and payments transformation programmes, from strategy through implementation. Manage cross-functional workstreams, launch new propositions, oversee partner integrations, and ensure customer, commercial, regulatory, and business outcomes. Own programme governance, financial performance, risk management, benefits delivery, supplier relationships, and senior stakeholder engagement in a regulated environment.

Lead and coordinate a 12+ workstream transformation across International Food, Home & Beauty (FH&B). Manage programme lifecycle from scoping and investment cases through delivery and BAU embedding, establish governance, own critical path and interdependencies, align UK and International strategy, and drive change across teams to deliver business outcomes.

As a Principal Engineer at M&S, you'll drive technical strategy, influence architecture, and mentor engineers while delivering on personalization, search, and machine learning features in collaboration with cross-functional teams.