Java Backend Engineer: Spring Boot & Microservices

Quess Singapore; Singapore; On-site; SGD 90,000 - 150,000; Full time

Job summary

Quess Singapore is seeking a highly skilled Java Software Engineer with strong backend expertise to develop and enhance applications supporting Wealth Management. The role spans backend and frontend, focusing on scalable APIs, microservices, modern architecture, and high-quality software delivery.

Key technologies include Java 21, Spring Boot, React, REST APIs, and messaging with Kafka/IBM MQ. You will design, implement, and optimise modulith-like architectures, ensuring robust testing with

Qualifications

• Strong proficiency in Java 21 and core Java concepts.
• Expert-level experience with Spring Boot, including MVC, Data, Security, and Cloud.
• Strong understanding of modulith and microservices design patterns.
• Hands-on experience with React and Micro Frontend (MFE) architecture.
• Strong knowledge of REST API design and development.
• Experience with MariaDB, PostgreSQL, or similar relational databases, including SQL optimisation.
• Hands-on experience with Kafka, IBM MQ, or other messaging technologies.
• Strong testing experience with JUnit, Mockito, and/or Karate.
• Good understanding of SOLID principles, design patterns, clean code, and software engineering best practices.
• Experience troubleshooting and supporting applications in production environments.

Responsibilities

• Design, develop, and maintain full-stack applications using Java, Spring Boot, and React.
• Build, enhance, and optimise RESTful APIs and microservices.
• Design and implement modulith/microservices architectures and Micro Frontend (MFE) solutions.
• Develop scalable and maintainable solutions using modern software engineering best practices.
• Work with relational databases and optimise SQL queries and database performance.
• Integrate applications with Kafka, IBM MQ, and other messaging platforms.
• Develop comprehensive unit and integration tests using JUnit, Mockito, and Karate.
• Troubleshoot and resolve complex production issues across frontend and backend systems.
• Collaborate with Business Analysts, Project Managers, business stakeholders, and technology teams to deliver quality solutions.
• Participate in system design, architecture discussions, technical roadmap planning, and continuous improvement initiatives.
• Drive technical innovation and promote coding, design, testing, and engineering best practices.

Skills

Java 21

Spring Boot

React

REST APIs

Microservices

Modulith/Microservices

Kafka

IBM MQ

JUnit

Mockito

Karate

SQL optimization

SOLID principles

Production support

Tools

MariaDB

PostgreSQL

Kafka

IBM MQ

Job description

Quess Singapore is seeking a highly skilled Java Software Engineer with strong backend expertise to develop and enhance applications supporting Wealth Management. The role spans backend and frontend, focusing on scalable APIs, microservices, modern architecture, and high-quality software delivery.

Key technologies include Java 21, Spring Boot, React, REST APIs, and messaging with Kafka/IBM MQ. You will design, implement, and optimise modulith-like architectures, ensuring robust testing with