Java Developer (MQTT, ActiveMQ, Cassandra, J2EE, LDAP, SOAP, WebSphere, Spring Security, JWT) at EXASOFT CONSULTING PTE. LTD. – Singapore | Jobyssey

Responsibilities

Develop and enhance enterprise-grade backend applications using Java, Spring Boot, and microservices architecture.
Build and integrate scalable REST and SOAP-based services for enterprise applications and system integrations.
Implement asynchronous and event-driven application components using messaging technologies such as MQTT, Kafka, and ActiveMQ.
Develop cloud-enabled backend solutions using AWS services, including serverless application components.
Design and maintain applications deployed in containerized environments using Docker and Kubernetes.
Develop data-access and persistence components using Java-based ORM technologies across relational and NoSQL database environments.
Build solutions requiring integration with legacy enterprise platforms, including J2EE-based application environments and enterprise application servers.
Implement secure application and API access using Spring Security, JWT, and LDAP-based authentication mechanisms.
Develop automated build, testing, and deployment workflows using Jenkins and CI/CD practices.
Collaborate on technical design, system integration, code reviews, performance improvements, troubleshooting, and Agile delivery.

Requirements

8+ years of professional experience in Java development, with strong hands‑on expertise in Java and Spring Boot.
Strong experience developing microservices and enterprise backend applications using Java.
Hands‑on experience designing and integrating REST and SOAP web services.
Practical experience with event‑driven or messaging‑based systems, particularly MQTT, Kafka, or ActiveMQ.
Experience with J2EE technologies, including concepts such as Servlets, JSP, JDBC, EJB, or equivalent enterprise Java technologies.
Experience working with Cassandra or other NoSQL databases, together with relational database technologies such as Oracle, DB2, or MySQL.
Hands‑on experience with Docker and Kubernetes for application deployment and runtime environments.
Experience with AWS services, preferably including AWS Lambda, S3, or EC2.
Experience implementing application security using Spring Security, JWT, and/or LDAP.
Experience with Jenkins and CI/CD automation.
Experience in enterprise application servers such as WebSphere, WebLogic, JBoss, or Tomcat.
Experience working in Agile/Scrum development environments.

Java Developer (MQTT, ActiveMQ, Cassandra, J2EE, LDAP, SOAP, WebSphere, Spring Security, JWT)

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