Senior Mobile Backend Developer (Java / Kotlin, AWS, Microservices) - Contract
We are hiring a Senior Mobile Backend Developer to work on high-scale, cloud-native platforms supporting mobile applications in a regulated environment.
This is a hands-on backend role focused on Java/Kotlin microservices, secure API design, and cloud delivery. You will contribute across the full SDLC while influencing engineering standards, best practices, and technical quality.
Key Responsibilities
* Design and build scalable backend services using Java or Kotlin and Spring Boot
* Develop secure, mobile-facing APIs using OAuth 2.0 and modern authentication patterns
* Work with microservices and event-driven architectures
* Deploy and support services in AWS / cloud environments
* Apply TDD / BDD and automation testing to deliver high-quality code
* Collaborate with engineers, technical leads, and stakeholders across delivery teams
* Mentor peers and contribute to continuous improvement initiatives
Required Skills & Experience
* Strong backend development experience with Java and/or Kotlin
* Spring Boot, REST APIs, microservices architecture
* Secure API design, OAuth, authentication/authorisation
* AWS or cloud platform experience
* Event-driven systems and distributed architectures
* Experience working in financial services or regulated environments
* Strong problem-solving and communication skills
Contract Details
* Contract role
* Hybrid working
* Competitive market rates
If you are a senior backend engineer looking to work on cloud-first, mobile-enabled platforms with real technical ownership, apply now
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