Java Developer (J2EE, Spring Boot, Kafka, K8s, PCI DSS, AWS, Azure, OAuth)

EVYONIC SOLUTIONS PTE. LTD.; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

EVYONIC Solutions Pte. Ltd. is seeking a senior backend engineer to design, implement, and scale enterprise applications using Java and Spring Boot. You will architect microservices, enable RESTful API integration, and drive cloud deployment across AWS and Azure.

Candidate will optimize performance, implement CI/CD, enforce security best practices, and mentor junior developers through the SDLC.

Qualifications

• Minimum 8+ years of software development, backend engineering, and enterprise integration.
• Proven hands-on experience with Java/J2EE and Spring Boot.
• Strong background in microservices, distributed systems, and API design.

Responsibilities

• Lead design and development of enterprise applications using Java/Spring Boot.
• Build and maintain microservices to support distributed business integrations.
• Develop secure RESTful APIs and integrate with front-end systems.

Skills

Java

Spring Boot

Microservices

REST APIs

Hibernate/JPA

Kafka

Cloud (AWS/Azure)

Docker

Kubernetes

OpenAPI

CI/CD

Security (OWASP)

Unit/Integration Testing

React integration

Tools

Docker

Kubernetes

OpenAPI

Jenkins

GitLab CI/CD

Maven

Job description

Responsibilities

• Lead the design and development of enterprise applications using Java and Spring Boot, ensuring high performance, scalability, and maintainability.
• Design and implement microservices-based solutions to support distributed applications and complex business integrations.
• Translate business requirements into technical designs and scalable backend solutions.
• Develop and integrate RESTful APIs to enable secure and efficient communication between enterprise systems.
• Establish coding standards, reusable design patterns, and development practices to improve software quality and consistency.
• Optimize data access and application performance using Hibernate/JPA and appropriate database technologies.
• Design event-driven integrations using Apache Kafka to support reliable communication between distributed services.
• Drive cloud application development and deployment across AWS and Microsoft Azure environments.
• Manage application containerization and deployment using Docker and Kubernetes.
• Collaborate with frontend teams to integrate React applications with backend services.
• Identify architectural risks, troubleshoot complex technical issues, and improve application reliability and performance.
• Implement automated testing and CI/CD practices to improve delivery quality and deployment efficiency.
• Ensure applications follow security best practices and relevant compliance requirements.
• Provide technical guidance, conduct code reviews, and mentor developers throughout the software development lifecycle.

Requirements

• Minimum 8+ years of experience in software development, backend engineering, and enterprise application integration.
• Strong hands-on experience in Java/J2EE and Spring Boot.
• Proven experience designing and developing microservices and distributed systems.
• Experience in RESTful API development, integration, and service-oriented architecture.
• Experience in oriented programming, design patterns, clean code, and application architecture.
• Practical experience with Hibernate/JPA and relational database technologies such as PostgreSQL or MariaDB.
• Hands-on experience with Apache Kafka and event-driven architecture.
• Experience deploying applications on AWS and Microsoft Azure.
• Experience with Docker and Kubernetes for containerization and orchestration.
• Experience with Spring Cloud and API documentation using OpenAPI.
• Experience with CI/CD tools such as Jenkins or GitLab CI/CD and build tools such as Maven.
• Experience in OAuth , secure coding practices, OWASP guidelines, and PCI-related security standards.
• Experience with unit testing, integration testing, and test-driven development.
• Experience in React and frontend-backend integration.
• Experience in application performance optimization, scalability, reliability, and production support.
• Strong technical leadership, analytical thinking, problem-solving, and team collaboration skills.
• Certification in Java programming is preferred.