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

EXASOFT CONSULTING PTE. LTD.; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

EXASOFT CONSULTING PTE. LTD. seeks a senior Java backend engineer to drive backend development using Java, Spring Boot, and microservices. You will design scalable REST/SOAP services, integrate with enterprise systems, and implement event-driven architectures on AWS.

You will work with Docker/Kubernetes for deployment, apply Spring Security with JWT/LDAP for security, and contribute to CI/CD through Jenkins in an Agile environment.

Qualifications

• 8+ years of professional experience in Java development.
• Strong experience with Java, Spring Boot, and microservices.
• Hands-on experience designing REST and SOAP web services.
• Experience with event-driven or messaging systems like MQTT, Kafka, or ActiveMQ.
• Experience with Docker and Kubernetes for deployment.
• Experience with AWS services and CI/CD tooling like Jenkins.
• Familiarity with enterprise app servers and J2EE concepts.
• Experience in Agile/Scrum environments.

Responsibilities

• Develop and enhance enterprise-grade backend applications using Java, Spring Boot, and microservices.
• Build and integrate scalable REST and SOAP services for enterprise apps and integrations.
• Implement asynchronous components using MQTT, Kafka, and ActiveMQ.
• Develop cloud-enabled backends on AWS with serverless components.
• Design and maintain containerized apps with Docker and Kubernetes.
• Develop data access and persistence using Java ORM across relational/NoSQL DBs.
• Integrate with legacy platforms including J2EE-era apps and enterprise servers.
• Implement security with Spring Security, JWT, and LDAP.
• Automate build, test, and deployment with Jenkins and CI/CD.
• Collaborate on design, integration, code reviews, performance, and Agile delivery.

Skills

Java

Spring Boot

Microservices

REST/SOAP

Cloud AWS

Docker

Kubernetes

Jenkins CI/CD

Security (JWT/LDAP)

Agile/Scrum

Tools

Docker

Kubernetes

Jenkins

AWS

MQTT

Kafka

ActiveMQ

Spring Security

JWT

LDAP

WebSphere

WebLogic

JBoss

Tomcat

Oracle

DB2

MySQL

Cassandra

Job description

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.