Senior Java Backend Engineer: High-Volume Payments

Network For Electronic Transfers (S); Singapore; On-site; SGD 120,000 - 160,000; Full time

Job summary

Network for Electronic Transfers (S) is seeking a highly experienced Senior Java Backend Developer to join our backend payment systems team on a 12-month contract. You will design and build scalable microservices and real-time processing for high-volume transactions.

You should have 6–9 years of Java backend experience, strong Spring Boot skills, and hands-on experience with distributed architectures, REST APIs, and AWS.

Qualifications

• 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.
• Hands-on experience with AWS, Docker, and Terraform will be an added advantage.

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.

Skills

Java backend

Spring Boot

Microservices

Event-driven

Performance

Education

Bachelor's degree in CS/SE or related

Tools

MySQL

Solace

AWS

Docker

Terraform

Maven

Git

Jenkins

Job description

Network for Electronic Transfers (S) is seeking a highly experienced Senior Java Backend Developer to join our backend payment systems team on a 12-month contract. You will design and build scalable microservices and real-time processing for high-volume transactions.

You should have 6–9 years of Java backend experience, strong Spring Boot skills, and hands-on experience with distributed architectures, REST APIs, and AWS.