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