Senior Backend Engineer joining agile product teams at John Lewis Partnership. Building new features using Kotlin or Java and mentoring less experienced Engineers in a hybrid working environment.
About the role
- Senior Full Stack Developer responsible for architecting scalable web applications for a digital commerce ecosystem. Collaborating with cross-functional teams to deliver best-in-class solutions.
Responsibilities
- Design, develop, and maintain robust Java-based backend services and microservices
- Build and expose RESTful APIs following OpenAPI/Swagger standards for consumption by frontend and third-party systems
- Write and optimize complex SQL queries, stored procedures, and data models across relational databases (Oracle, MySQL, PostgreSQL)
- Develop and maintain integrations with SAP systems using BAPIs, Remote Function Modules (RFMs), and IDocs
- Implement secure authentication and authorization mechanisms (OAuth 2.0, JWT)
- Ensure code quality through unit testing, code reviews, and adherence to OWASP security standards
- Build dynamic, responsive web applications using React, Next.js, and/or Angular
- Develop headless frontend architectures
- Consume and integrate RESTful APIs and GraphQL endpoints in frontend applications
- Optimize web performance including Core Web Vitals, lazy loading, and code splitting
- Implement component-driven development using reusable UI libraries and design systems
Requirements
- 6–8 years of hands-on, professional experience in full stack software development
- Strong proficiency in Java (Spring Boot, Spring MVC, Hibernate)
- Experience with RESTful API design and microservices architecture
- Familiarity with JUnit, Mockito, or similar testing frameworks
- Solid SQL expertise — complex queries, schema design, indexing, and performance tuning
- Experience with one or more: Oracle, MySQL, PostgreSQL, MS SQL Server
- Proven experience with SAP integration
- Working knowledge of BAPIs and Remote Function Modules (RFC)
- Experience with SAP ECC or S/4HANA integration patterns
- Frontend expertise in at least two of: React, Next.js, Angular
- Strong understanding of JavaScript (ES6+) and TypeScript
- Experience building headless websites / Jamstack architectures
- Proficiency with Node.js for server-side rendering or middleware layer development
- Familiarity with version control (Git), branching strategies, and code review processes
- Experience with Docker, Kubernetes, or similar containerization/orchestration tools
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