Backend Java Developer

IO TECH SOLUTIONS LIMITED; Hong Kong; On-site; HKD 480,000 - 600,000; Full time

Job summary

IO TECH SOLUTIONS LIMITED is seeking a Backend Engineer to design, build, and maintain secure, scalable backend services that power our digital products. You will apply lean and agile principles to delivery and continuously improve platforms, collaborating with cross-functional teams worldwide.

You will expert in Java 17+, Spring Boot/Spring Cloud, and cloud and containerized environments. You’ll own testing through TDD and contribute to architecture discussions and design reviews.

Qualifications

• 5+ years building microservices and REST-based systems.
• Experience in product-oriented, lean and Agile delivery.
• Proficiency in Java 17+ and Spring ecosystem.
• Familiarity with cloud platforms and DevOps practices.

Responsibilities

• Design, build, and maintain secure, scalable backend systems.
• Develop microservices and backend APIs to support new features.
• Ensure production reliability and perform root cause analysis.
• Collaborate in Scrum ceremonies and sprint planning.
• Maintain strong test coverage with unit and integration tests.
• Participate in architecture discussions and design sessions.

Skills

TDD

Agile

DevOps

OOP

Design patterns

REST architecture

Education

Bachelor's degree in a technical field

Tools

Java 17+

Spring Boot

Spring Cloud

Amazon RDS MySQL

Docker

Kubernetes

JUnit

Job description

Position Summary

As a Backend Engineer, you will design, build, and maintain secure, reliable, and scalable software. You'll apply lean and agile principles to solve challenging problems, continuously improve our platforms, and contribute to successful delivery of our digital products. You'll play a key role in developing backend services that power new experiences and technologies.

Primary Responsibilities

• Collaborate with cross-functional teams to invent, design, implement, and deploy new backend systems and enhancements to existing services.
• Engineer and maintain microservices and backend APIs to support new product functionality.
• Deliver backend features that enable new experiences and integrations.
• Maintain production systems, investigate incidents, and perform root cause analysis to prevent recurrence.
• Actively participate in Scrum ceremonies and contribute to sprint planning, execution, and review.
• Ensure strong test coverage through unit and integration testing.
• Participate in peer design discussions and code reviews.
• Contribute to architecture planning and technical design sessions.
• Proactively collaborate with teammates, including distributed/remote stakeholders, and communicate effectively.

Requirements

• Bachelor's degree in a technical field (or equivalent work experience and training).
• Minimum of 5 years experience building microservices and web-based systems (REST).
• Experience in a product-oriented, team-based environment using modern delivery practices (e.g., UX/product thinking, lean, Agile, DevOps, cloud).
• Proficiency in Java 17+ (preferred JDK25).
• Proficiency with Spring Boot and Spring Cloud.
• Experience with Amazon RDS (MySQL).
• Understanding of Docker and Kubernetes.
• Ability to write unit tests and follow TDD practices.
• Strong understanding of design patterns, OOP, and software development methodologies.