Application Maintenance Engineer

OPTIMUM SOLUTIONS (SINGAPORE) PTE LTD; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

OPTIMUM SOLUTIONS (SINGAPORE) PTE LTD is seeking an experienced Java/OSS tech lead for production support and application development. You will troubleshoot complex issues across Java, Spring Boot, REST APIs and microservices, while supporting the FIS Open Payment Framework in a production environment.

The role involves coordinating SIT/UAT testing, validating fixes and managing production releases with cross-functional teams, vendors and QA.

Qualifications

• Degree in Computer Science, IT or related discipline.
• Strong hands-on experience with Java ecosystem and modern frameworks.
• Experience with production support, incident/problem management and CI/CD tools.

Responsibilities

• Perform root cause analysis and remediation of application, batch, database and connectivity issues.
• Develop, maintain and troubleshoot applications using Java, Spring Boot, REST APIs and microservices.
• Support FIS Open Payment Framework (OPF), including defect remediation and production deployment.
• Coordinate SIT/UAT validation and production releases based on defect priority.
• Monitor performance and troubleshoot across databases, middleware, OS and messaging platforms.
• Manage incident, problem and defect lifecycles with timely closure KPIs.
• Collaborate with development, QA, infrastructure teams and vendors to maintain production stability.

Skills

Java

Spring Boot

REST APIs

Microservices

Hibernate ORM

Education

Bachelor's degree in Computer Science/Information Technology or related discipline

Tools

Jenkins

Bitbucket

SonarQube

Remedy/JIRA

OpenShift

JBoss

Kafka

Job description

Responsibilities

• Perform root cause analysis and resolve application, batch processing, database and connectivity issues.

• Develop, maintain and troubleshoot applications using Java, Spring Boot, REST APIs and microservices.

• Support FIS Open Payment Framework (OPF), including defect remediation, troubleshooting and production deployment.

• Conduct SIT, support UAT, validate fixes and coordinate production releases based on defect priority.

• Monitor application performance and troubleshoot issues across databases, middleware, operating systems and messaging platforms.

• Manage incident, problem and defect lifecycles, ensuring timely resolution and compliance with closure KPIs.

• Coordinate with development, QA, infrastructure teams and vendors to maintain production stability and improve application quality.

Requirements

• Degree in Computer Science, Information Technology or a related discipline, with at least 6 years of relevant experience.

• Strong hands-on experience in Java, Spring Boot, REST APIs, microservices and Hibernate ORM.

• Mandatory experience in FIS Open Payment Framework (OPF) troubleshooting, maintenance and deployment.

• Experience with SQL/Oracle databases, Linux/Solaris, JBoss, OpenShift and Apache.

• Knowledge of messaging and scheduling tools such as Kafka, IBM MQ, Connect:Direct and Control-M.

• Experience in production support, incident/problem management, CI/CD tools such as Jenkins, Bitbucket and SonarQube, and defect tracking using Remedy/JIRA.

• Strong troubleshooting, analytical skills; payment domain and SWIFT messaging experience are advantageous.