Java developer (Kafka, Flowable, State Machine, JMS, Spring Cloud, SOAP, GraphQL, Kubernetes)

EVYONIC SOLUTIONS PTE. LTD.; Singapore; On-site; SGD 150,000 - 210,000; Full time

Job summary

EVYONIC Solutions PTE. LTD. is seeking a senior Java backend developer to design and build scalable enterprise applications.

You will craft robust microservices with Spring Boot, implement event-driven patterns using Kafka, and drive workflow solutions with Flowable. Expect secure, high-availability services deployed in Docker/Kubernetes with strong emphasis on performance and reliability. The role requires deep expertise in REST/SOAP/OpenAPI, modern security practices (OAuth/JWT), and extensive

Qualifications

• 8+ years of experience in Java-based enterprise application development.
• Hands-on experience with Java, Spring Boot, and Microservices Architecture.
• Experience with Apache Kafka and event-driven/asynchronous development.
• Experience with Flowable Workflow Management and State Machines.
• Strong Spring Security, OAuth, and JWT knowledge.
• Experience with REST, SOAP, GraphQL, and OpenAPI.
• Docker and Kubernetes in enterprise contexts.
• Spring Cloud, JPA/Hibernate, Jakarta EE.
• Experience with JMS or RabbitMQ preferred.
• Database expertise: Oracle, MySQL, MSSQL, or MongoDB.
• Proficiency in design patterns, OOP, TDD/BDD, and automated testing.
• CI/CD tools: Jenkins or GitLab CI/CD; Maven/Gradle; SonarQube.

Responsibilities

• Design, develop, and maintain scalable backend solutions using Java, Spring Boot, and Microservices.
• Develop reliable APIs and service integrations for complex enterprise applications.
• Build asynchronous and event-driven solutions with Kafka and messaging tech.
• Design and implement workflow-driven apps using Flowable and State Machines.
• Secure services with Spring Security, OAuth, and JWT.
• Work on distributed apps in Docker and Kubernetes environments.
• Support high transaction volumes with scalable service components.
• Integrate backend with web apps and external enterprise systems via REST/SOAP.
• Collaborate with architecture, product, QA, and engineering teams.
• Troubleshoot, perform root-cause analysis, and optimize performance.
• Participate in design/code reviews, automated testing, and best practices.
• Provide technical guidance to developers and engineering standards.

Skills

Java enterprise development

Event-driven architecture

RESTful APIs

Distributed systems

Code reviews & debugging

Testing (TDD/BDD)

System design & performance

CI/CD pipelines

Security protocols & auth (OAuth, JWT)

Messaging systems (Kafka, JMS, Rabbit)

Tools

Docker

Kubernetes

Apache Kafka

Flowable Workflow

Spring Boot

Spring Cloud

JPA/Hibernate

OpenAPI/GraphQL

Jenkins/GitLab CI/CD

Maven/Gradle

Job description

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.