Senior Backend Java Developer - API & Spring Expert

Optimum Solutions (Singapore) Pte Ltd. is seeking an experienced Backend Java Developer to design, build, and maintain high-throughput RESTful APIs and enterprise backend components.

You will focus on scalable code, multi-database interactions, asynchronous execution, and strong object-oriented and functional programming across the stack. The role emphasizes REST API design with Java 11+/Spring Boot, SOLID patterns, and OpenAPI documentation, plus tuning data persistence via Spring Data