Java developer (Kafka, Flowable)

3 CUBED BUSINESS CONSULTING PTE. LTD.; Singapore; On-site; SGD 140,000 - 240,000; Full time

Job summary

3 CUBED BUSINESS CONSULTING PTE. LTD. is seeking a senior Java backend engineer to design, develop, and maintain scalable enterprise applications.

You will work with Java, Spring Boot, microservices, and modern API technologies to deliver robust systems. You'll build event-driven solutions with Apache Kafka, Flowable workflows, and secure services using Spring Security, OAuth, and JWT. The role involves Docker, Kubernetes, REST/SOAP, and collaboration with architecture, product, QA, and

Qualifications

• 8+ years in Java-based enterprise development.
• Hands-on with Java, Spring Boot, and Microservices.
• Mandatory Kafka and event-driven development.
• Flowable Workflow Management experience.
• Experience with Spring Security, OAuth, JWT.
• Docker and Kubernetes in enterprise env.
• Experience with REST/SOAP/GraphQL/OpenAPI.
• RDBMS/NoSQL databases expertise.

Responsibilities

• Design, develop, and maintain scalable backend solutions.
• Develop reliable APIs and service integrations.
• Build asynchronous and event-driven solutions with Kafka.
• Design workflow-driven apps with Flowable.
• Develop secure services using Spring Security, OAuth, JWT.
• Work on distributed apps with Docker and Kubernetes.
• Design components for high throughput, concurrency, performance.
• Integrate backend with web apps and external systems using REST/SOAP.
• Collaborate with architecture, product, QA, and engineering teams.
• Perform troubleshooting, root-cause analysis, and performance optimization.
• Participate in design reviews, code reviews, automated testing, and continuous improvement.
• Provide technical guidance and contribute to standards.

Skills

Java

Spring Boot

Microservices

Apache Kafka

Flowable Workflow

Spring Security / OAuth / JWT

Docker / Kubernetes

REST / SOAP / GraphQL

JMS / RabbitMQ

SQL / NoSQL databases

Job description

Roles & Responsibilities

Responsibilities

• Design, develop, and maintain scalable backend solutions using Java, Spring Boot, and Microservices.
• Develop reliable APIs and service integrations to support complex enterprise applications and business workflows.
• Build asynchronous and event-driven solutions using Apache Kafka and messaging technologies.
• Design and implement workflow-driven applications using Flowable Workflow Management and State Machine concepts.
• Develop secure application services using Spring Security, OAuth, and JWT.
• Work on distributed applications deployed in Docker and Kubernetes environments.
• Design service components that support high transaction volumes, concurrency, availability, and performance requirements.
• Integrate backend services with web applications and external enterprise systems using REST, SOAP, and other API technologies.
• Collaborate with architecture, product, QA, and engineering teams to translate business requirements into scalable technical solutions.
• Perform technical troubleshooting, root-cause analysis, performance optimization, and production issue resolution.
• Participate in design reviews, code reviews, automated testing, and continuous improvement of development practices.
• Provide technical guidance to developers and contribute to engineering standards and best practices .

Requirements

• 8+ years of experience in Java-based enterprise application development.
• Strong hands-on experience in Java, Spring Boot, and Microservices Architecture.
• Mandatory experience with Apache Kafka and event-driven/asynchronous application development.
• Mandatory hands-on experience with Flowable Workflow Management and State Machine Workflow.
• Strong experience with Spring Security, OAuth, and JWT.
• Experience in REST APIs, SOAP, GraphQL, and OpenAPI.
• Hands-on experience with Docker and Kubernetes in enterprise application environments.
• Experience in Spring Cloud, JPA/Hibernate, and enterprise Java/Jakarta EE.
• Experience with messaging technologies such as JMS or RabbitMQ is preferred.
• Strong database experience with Oracle, MySQL, MSSQL, or MongoDB.
• Experience in design patterns, object-oriented programming, TDD/BDD, and automated testing.
• Experience with Jenkins/GitLab CI/CD, Maven/Gradle, SonarQube, and Git-based development workflows is preferred.
• Experience developing high-availability, high-volume enterprise applications, preferably within banking, financial services, or other transaction-intensive environments.
• Strong troubleshooting, system-design, code-review, and technical collaboration skills.