Java Developer (Contract)

Tangspac Consulting Group; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Tangspac Consulting Group in Singapore seeks an experienced Java backend engineer to design, develop, and maintain scalable systems for high-volume processing. You will build secure APIs, implement event-driven architectures, and work with cross-functional teams to ensure reliability.

The role emphasizes production support, performance tuning, and close collaboration with DevOps on CI/CD pipelines and deployments across environments in a fast-paced fintech-like setting.

Qualifications

• Bachelor's degree in computer science, software engineering, or related field.
• 5-7 years of Java backend development experience.
• Strong proficiency in Java 8+ and Spring Boot.
• Experience with microservices, event-driven architectures, REST APIs, and messaging systems (Solace).
• Proficiency with MySQL tuning and query optimization.
• Experience with unit testing (JUnit, Mockito) and CI/CD tooling.

Responsibilities

• Design, develop, and maintain scalable backend systems for high-volume processing.
• Develop secure, high-performance APIs for internal and external integration.
• Contribute to architecture design for scalable, resilient systems.
• Implement event-driven and asynchronous processing for backend services.
• Optimize performance, perform load testing, and identify bottlenecks.
• Troubleshoot production issues and perform root cause analysis.
• Collaborate with DevOps to support CI/CD pipelines and deployment across environments.

Skills

Java backend

Java 21

Spring Boot

Microservices

Event-driven architecture

REST API development

Messaging systems (Solace)

MySQL tuning

Unit testing (JUnit/Mockito)

CI/CD tooling (Jenkins, Maven, Git, JI

Performance optimization

AWS

Docker

Terraform

Production support

Education

Bachelor's degree in CS / Software Engineering

Tools

Solace

MySQL

AWS

Docker

Terraform

Jenkins

Maven

Git

Jira

CI/CD pipelines

Job description

Responsibilities:

• Design, develop, and maintain scalable backend systems for high-volume transaction processing and international payment gateway integrations.
• Develop secure and high-performance APIs for internal and external system integration.
• Write clean, maintainable, and testable code following engineering best practices.
• Contributes to architecture design for scalable, resilient, and fault-tolerant systems.
• Implement event-driven and asynchronous processing for backend services.
• Support integration across multiple internal and external platforms.
• Design and implement message-driven architectures using enterprise messaging systems.
• Optimize application, database, and service-level performance.
• Perform load testing and identify system bottlenecks.
• Troubleshoot production issues and perform root cause analysis (RCA).
• Ensure system stability and reliability in high-throughput environments.
• Work closely with DevOps teams to support CI/CD pipeline implementation.
• Manage build, deployment, and release processes across environments.

Requirements:

• Bachelor's degree in computer science, software engineering, or a related field.
• 5-7 years of experience in Java backend development.
• Strong proficiency in Java 8+ (preferably Java 21) and Spring Boot.
• Proven experience with microservices architecture, event-driven architecture, and REST API development.
• Hands-on experience with messaging systems, preferably Solace.
• Strong experience with MySQL, including database tuning, SQL optimization, indexing, and query tuning.
• Experience with unit testing frameworks such as JUnit and Mockito.
• Proficiency in Maven, Git, Jira, and Jenkins-based CI/CD pipelines.
• Experience in load testing, performance testing, and backend optimization.
• Strong troubleshooting and debugging capabilities, including production issue resolution and root cause analysis.
• Proven experience in e-commerce, banking, or other high-volume transaction environments.
• Strong experience building distributed, scalable, and high-availability systems.
• Hands-on experience implementing microservices and event-driven architecture in production environments.
• Experience handling performance-critical and real-time backend systems.
• Demonstrated ability to work in production support and critical incident resolution environments.
• Hands-on experience with AWS, Docker, and Terraform will be an added advantage.