Senior Java Developer

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

Job summary

Morgan McKinley in Singapore is seeking an experienced Java integration specialist to design, develop, and implement OSB-based migration solutions to AWS. You will work with cross-functional teams to translate business requirements into scalable interfaces and APIs.

The role requires hands-on OSB, Oracle SOA Suite, WebLogic, Spring, and AWS cloud services, with a strong focus on secure, reliable, and performant integrations across systems.

Qualifications

• Bachelor’s degree in CS/IT/CE or equivalent.
• 5+ years of Java development experience (Java 8+).
• Hands-on OSB experience including routing, mediation and transformation.
• Experience with Oracle WebLogic and Oracle SOA Suite.
• Strong Spring (Boot, MVC, Security, AOP) and API integration (SOAP/REST).
• Experience with JMS, databases (Oracle/PostgreSQL) and Git/Gradle.
• AWS cloud experience and IaC tools (Terraform/CloudFormation).
• Ability to design secure, scalable integration patterns.

Responsibilities

• Design, develop, and implement integration solutions for migrations to AWS.
• Prepare migration plans, timelines, and risk mitigation.
• Collaborate with cross-functional teams to implement integration strategies.
• Execute application migrations to AWS Cloud with migration team.
• Create APIs for communication between applications and services.
• Ensure API designs follow best practices for security and performance.
• Troubleshoot integration issues and perform thorough testing.
• Collaborate with QA to test integrated systems.
• Provide documentation for troubleshooting and support purposes.

Skills

Java development

APIs & integration

RESTful APIs

AWS Cloud

SOA & ESB patterns

Security & performance

Education

Bachelor’s Degree in Computer Science / IT / Computer Engineering

Tools

OSB (Oracle Service Bus)

Oracle WebLogic Server

Oracle SOA Suite

Spring Framework (Boot / MVC / Security / AOP)

AWS Cloud-native services (EC2, S3, Lambda, SQS, RDS)

Terraform / CloudFormation

Job description

Responsibilities

• Design, develop, and implement integration solutions for applications migrating to the AWS Cloud platform.
• Prepare detailed migration plans, timelines, and risk mitigation strategies.
• Collaborate with cross-functional teams to understand business requirements and implement effective integration strategies.
• Work closely with the migration team to execute the migration of applications to the AWS Cloud.
• Create and implement APIs to facilitate communication between applications and services.
• Ensure API designs adhere to best practices for scalability, security, and performance.
• Collaborate with team members to troubleshoot complex problems related to integration processes.
• Conduct thorough testing of integration solutions to ensure functionality, performance, and data accuracy.
• Collaborate with QA teams to develop and execute test plans for integrated systems.
• Provide documentation for troubleshooting and support purposes.
• Create and implement APIs to facilitate communication between applications and services.
• Ensure API designs adhere to best practices for scalability, security, and performance.

Requirements

• Bachelor’s Degree in Computer Science / Information Technology / Computer Engineering or equivalent.
• In-depth knowledge and hands‑on experience with Enterprise service bus such as OSB (Oracle Service Bus), including configuration, deployment, and management.
• At least 5 years of experience in Java development (Java 8 and above, J2EE, EJB, Spring Framework, etc.,)
• Knowledge of and Spring framework, specifically in Spring Boot, Spring MVC, Spring Security, Spring AOP, and API integration with SOAP and RESTful webservices Strong experience in OSB service routing, mediation, message transformation, and integration patterns.
• Ability to manage integrations & authentication between OSB and various systems, ensuring secure connection.
• Experience in JMS (Java Message Service) configuration and administration, including message queuing and reliable message delivery.
• Experience with Oracle WebLogic Server administration, including installation, configuration, and troubleshooting.
• Experience in designing, developing, and supporting SOA composites using Oracle SOA Suite (BPEL, Mediator, OSB)
• Familiarity with database integration to Oracle DB and PostgreSQL using Spring Data JPA, Hibernate, JDBC
• Knowledge in building and version control with Git, Gradle, Apache Ant
• Hands‑on experience with AWS Cloud‑native services (e.g. EC2, S3, Lambda, SQS, RDS, Kubernates, API Gateway.)
• Familiarity with IaC tools like Terraform or CloudFormation
• Ability to handle performance tuning, monitoring, and scaling of OSB and associated components in AWS, ensuring optimal performance and reliability.
• Strong understanding of RESTful APIs, SOAP, and other communication protocols.