Java Developer with Kotlin

Tech Aalto; Singapore; On-site; SGD 78,000 - 134,000; Full time

Job summary

Tech Aalto in Singapore is seeking an experienced Java Developer with strong backend expertise in Java and Kotlin to build scalable, high-performance applications using modern frameworks.

You will design and implement RESTful APIs, work in Agile teams, participate in architecture discussions, and ensure security, performance, and reliability across microservices and cloud deployments.

Qualifications

• 5+ years hands-on Java development with backend focus.
• At least 1 year Kotlin experience and practical Kotlin usage.
• Proficiency in Spring Boot and RESTful service design.
• Strong understanding of relational databases and SQL.
• Experience with Git, CI/CD, and build tools.
• Knowledge of Agile/Scrum practices and microservices architecture.

Responsibilities

• Design, develop, and maintain backend applications using Java and Kotlin.
• Build and consume RESTful APIs and integrate services.
• Participate in system design, architecture discussions, and technical solutioning.
• Ensure performance, security, and scalability of applications.
• Collaborate with product owners, QA, and DevOps in Agile ceremonies.
• Troubleshoot production issues and perform code reviews.

Skills

Core Java

Kotlin

Spring Boot

REST APIs

SQL

Git/CI-CD

Debugging

Agile/Scrum

Microservices

Cloud platforms

Kafka/RabbitMQ

Docker/Kubernetes

Performance tuning

Tools

Docker

Kubernetes

Kafka

RabbitMQ

Spring Framework

Job description

Java Developer with Kotlin

Experience Required

• Minimum 5 years of hands-on experience in Java
• Minimum 1 year of hands-on experience in Kotlin

Job Summary

We are looking for an experienced Java Developer with strong backend development skills and practical experience in Kotlin. The ideal candidate will have a solid background in building scalable, high-performance applications, working with modern frameworks, and collaborating in an Agile environment.

Key Responsibilities

• Design, develop, and maintain backend applications using Java and Kotlin
• Write clean, efficient, and maintainable code following best practices
• Participate in system design, architecture discussions, and technical solutioning
• Build RESTful APIs and integrate with internal/external services
• Work closely with product owners, business analysts, QA, and DevOps teams
• Troubleshoot, debug, and resolve production and application issues
• Perform code reviews and support continuous improvement in engineering practices
• Ensure application performance, security, and scalability
• Participate in Agile ceremonies such as sprint planning, daily stand-ups, and retrospectives

Required Skills

• Strong expertise in Core Java
• Hands-on experience with Kotlin
• Experience with Spring Boot / Spring Framework
• Good understanding of REST APIs, microservices, and backend architecture
• Experience with SQL and relational databases
• Familiarity with Git, build tools, and CI/CD pipelines
• Strong debugging and problem-solving skills
• Knowledge of Agile/Scrum methodologies
• Experience with microservices architecture
• Exposure to cloud platforms such as AWS, Azure, or GCP
• Experience with messaging systems like Kafka or RabbitMQ
• Knowledge of containerization tools like Docker and Kubernetes
• Experience in performance tuning and optimization