Senior Java Developer

OPTIMUM SOLUTIONS (SINGAPORE) PTE LTD • singapore, singapore • Posted July 09, 2026

Position Overview

            Degree in Computer Science, Information Systems, Engineering, or a related field. 
Minimum 8 years hands‑on experience in backend development delivering production grade systems(microservices, APIs, event processing, web-portal, production support). 
Strong experience with AWS-native systems and operations (any of the following): o API Gateway / ALB, ECS/Fargate, RDS, S3, CloudWatch/CloudTrail, WAF o Familiarity with CI/CD pipelines and tools such as Jenkins / Bitbucket /Octopus / Terraform (or equivalents). 
Experience in test automation and engineering best practices (unit tests, contract tests, integration tests) 
Solid understanding of API security patterns and implementation: request signing (HMAC/signature validation), Authentication, nonce/timestamp anti-replay, idempotency design, secure secret handling 
Good understanding of open-source libraries, their usage and vulnerability management. 
Strong communication skills and ...
        