Java Developer – Service Reliability Engagement

Keystone Digital

Project-based · Remote · Flexible hours

About the role

Keystone Digital is preparing a high‑impact app store launch that requires tight coordination between mobile front‑ends and backend services. We need a Java Developer who can bridge the two layers, ensuring APIs are performant, secure, and ready for rapid scaling.

Key responsibilities

• Design and implement RESTful services that power upcoming mobile features
• Collaborate with mobile engineers to define contract‑first APIs
• Optimize existing micro‑services for latency and throughput
• Write comprehensive unit and integration tests using JUnit and Testcontainers
• Participate in code reviews and contribute to architectural decisions

Must-have skills

• Strong Java expertise (5+ years)
• Proficiency with Spring Boot and building micro‑service architectures
• Experience deploying services in cloud environments (AWS, GCP, or Azure)

Nice to have

• Familiarity with mobile SDK integration patterns
• Knowledge of CI/CD pipelines using Jenkins or GitHub Actions