Senior Java Backend Developer

NETS; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

NETS Group in Singapore seeks an experienced Senior Backend Engineer to design, develop, and maintain scalable backend systems for high-volume transaction processing and international payment gateway integrations. You will build secure, high-performance APIs, drive architecture with microservices and event-driven patterns, and collaborate with DevOps to support CI/CD and deployment across environments.

The ideal candidate has 6–9 years of Java backend experience, is proficient in Java 8+ and

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or related field.
• 6–9 years of Java backend development experience.
• Proficiency in Java 8+ (preferably Java 21) and Spring Boot.
• Experience with microservices, event-driven architectures, and REST APIs.
• Hands-on experience with messaging systems (Solace).
• Strong MySQL skills: tuning, indexing, SQL optimization.
• Experience with unit testing (JUnit/Mockito) and CI/CD pipelines.

Responsibilities

• Design, develop, and maintain scalable backend systems for high-volume processing.
• Develop secure, high-performance APIs for internal and external integrations.
• Contribute to architecture design for scalable, resilient systems.
• Implement event-driven processing and enterprise messaging patterns.
• Optimize performance and conduct load testing to identify bottlenecks.
• Troubleshoot production issues and perform root cause analysis (RCA).
• Collaborate with DevOps to support CI/CD pipelines and deployments.

Skills

Java backend

Microservices

Event-driven architecture

REST APIs

Distributed systems

High availability

Troubleshooting

Production support

CI/CD

Education

Bachelor's degree in Computer Science or related field

Tools

Solace

MySQL

JUnit

Mockito

Maven

Git

Jira

Jenkins

Job description

The NETS Group is a leading payments services group, enabling digital payments for merchants, consumers and banks across the entire payments value chain.

The Group operates Singapore’s national debit scheme enabling customers of DBS Bank/POSB, HSBC, Maybank, OCBC Bank, Standard Chartered Bank and UOB to make payments using their ATM cards or mobile devices at more than 130,000 acceptance points in the country as well as online payments.

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.
• 6–9 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.

Network for Electronic Transfers (Singapore) Pte Ltd.