Senior Backend Engineer – Scalable Microservices & APIs

Marks and Spencer; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Marks and Spencer Senior Software Engineer role focusing on the Customer Order Domain. You will design and implement backend services powering order creation, fulfilment, and multi-channel experiences.

Work with Java/Kotlin, build scalable microservices, leverage Kafka for high-volume workflows, and design GraphQL/REST APIs to ensure a robust developer experience for millions of customers.

Qualifications

• Proven backend design and operation of scalable services.
• Experience with Java and/or Kotlin and modern microservice architectures.
• Strong understanding of distributed systems and asynchronous messaging.

Responsibilities

• Design, build, and evolve backend services that support the complete customer order lifecycle, from order creation through to fulfilment and completion.
• Develop scalable microservices and APIs using Java/Kotlin, enabling reliable and efficient order processing across multiple channels.
• Contribute to event-driven architectures using Kafka to support high-volume transactional workflows across Payments, Pricing, and Fulfilment domains.
• Design and evolve GraphQL and REST APIs, ensuring consistency, performance, scalability, and an excellent developer experience.
• Build resilient, low-latency solutions using distributed databases, caching technologies and modern architectural patterns.
• Collaborate closely with Product Managers, Engineers, Architects and business stakeholders to solve complex commerce challenges.

Skills

Backend engineering

Java/Kotlin

Distributed systems

Event-driven architectures

APIs: GraphQL/REST

Kafka

API-first platforms

Tools

Kafka

Job description

Marks and Spencer Senior Software Engineer role focusing on the Customer Order Domain. You will design and implement backend services powering order creation, fulfilment, and multi-channel experiences.

Work with Java/Kotlin, build scalable microservices, leverage Kafka for high-volume workflows, and design GraphQL/REST APIs to ensure a robust developer experience for millions of customers.