Senior Software Development Engineer; SDE– Java​/API​/Backend

Senior Software Development Engineer (SDE3) – Java/API/Backend

Location:

Welwyn Garden City, UK (Hybrid, 2–3 days onsite)

Contract:

6 months, with possible extension

Overview
This role supports the development of a next-generation, scalable, and resilient Fulfilment Platform powering both manual and robotic warehouse operations across multiple product categories. You will join a global Java-focused engineering team working with modern microservices, event-driven architecture, cloud technologies, and a strong Dev Ops culture.

Key Responsibilities

* Design & Development:
Architect, build, and enhance high-performance Java-based backend applications for new fulfilment capabilities.

* System Optimisation:
Improve scalability, efficiency, and reliability of mission-critical systems in collaboration with cross-functional teams.

* API & Microservices Integration:
Develop robust APIs and microservices integrating with enterprise and third-party systems.

* Code Quality:
Deliver clean, maintainable, well-documented, and test-driven code aligned with industry standards.

* Troubleshooting:
Diagnose and resolve complex production issues to ensure uninterrupted operational performance.

* Mentorship:
Support and guide junior engineers while promoting best practices and continuous improvement.

* Innovation &

Collaboration:

Work closely with hardware, data science, and operations teams to drive forward-thinking technical solutions.

Required Experience

* Experience in agile product development and delivering scalable, distributed Java applications.

* Proven background in building and supporting reliable full-stack or backend services.

* Experience working within globally distributed engineering teams is highly beneficial.

Technical Skills

* Programming:

* Deep expertise in Java, Spring Boot, IDEs, and associated toolsets.

* Strong understanding of frameworks, abstraction layers, TDD, and debugging complex issues.

* Design:

* Ability to apply design patterns, domain modelling, idempotence, CQRS, and eventual consistency principles.

* Able to design for performance at all levels and leave code in a better state (“boy scout principle”).

* Tech Stack:

* Java, Spring Boot, Kafka, Postgre

SQL, Couchbase

* Azure Cloud, Docker, Kubernetes

* CI/CD using Azure Pipelines or Git Hub Actions