Java/Kotlin Developer | Hybrid, London | Inside IR35
Korn Ferry • City Of London, ENG, GB
7 days ago
Job description
- Design, develop, and maintain the mobile service layer (Backend-for-Frontend) supporting large-scale mobile applications
- Deliver secure, reliable, and high-performing Server Side APIs for Real Time consumer experiences
- Write clean, maintainable code and contribute to code reviews, refactoring, and continuous improvement initiatives
- Collaborate with mobile, product, and design teams to define solutions that enhance usability and functionality
- Troubleshoot and optimize application performance for responsiveness and scalability
- Create robust unit tests and integration tests to ensure software reliability
- Manage asynchronous processing, error handling, and performance optimization in distributed systems
- Support Legacy system integrations and modernize existing codebases when required
- Follow CI/CD best practices and contribute to team development pipelines and build systems
- Actively share ideas, propose improvements, and participate in solution design discussionsProven experience building Server Side applications with strong understanding of modern Back End development practices
- Proficiency in Kotlin or related JVM languages (Java, Scala, etc.)
- Practical knowledge of RESTful and GraphQL (GQL) API design and integration
- Hands-on experience with Gradle or similar build tools
- Solid understanding of asynchronous programming, thread management, and performance optimization
- Experience working with CI/CD pipelines and automated testing frameworks
- Strong debugging and problem-solving skills with attention to system scalability and maintainability
Nice to Have Skills
- Experience designing or integrating RAML-based documentation into API workflows
- Familiarity with Legacy system modernization or integration within enterprise environments
- Understanding of cloud-native development patterns or containerized deployment workflows (eg, Docker, Kubernetes)
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