Java Developer - Part-Time

Java Developer
Work location: Changi Business Park

MainResponsibilities

• Design, build, and maintain backend services and APIs using Java (Java 11+ / Spring Boot or equivalent)
• Develop and operate event-driven integrations using Apache Kafka (producers, consumers, streams, schema management)
• Design efficient data models and write performant queries against MariaDB (or other relational databases)
• Implement search and analytics features using Elasticsearch, including index design and query optimization
• Collaborate with cross-functional teams (product, DevOps, QA) to deliver reliable, scalable features
• Write clean, well-tested, maintainable code and participate in code reviews
• Diagnose and resolve performance bottlenecks across the application and data layers
• Contribute to architectural decisions around messaging, data storage, and service design
• Support CI/CD pipelines and participate in on-call/incident response as needed

Required:

• 4+ years of professional experience developing backend applications in Java
• Hands-on experience with Apache Kafka or similar message brokers (RabbitMQ, ActiveMQ) in production environments
• Strong SQL skills and practical experience with MariaDB or MySQL (schema design, indexing, query tuning)
• Experience with Elasticsearch, including index mapping design and search query construction
• Solid understanding of object-oriented design, multithreading, and REST API development
• Familiarity with Spring / Spring Boot ecosystem
• Experience with version control (Git) and CI/CD workflows
• Strong debugging and problem-solving skills in distributed systems
• Hands-on experience with containerization (Docker, Kubernetes)

Nice to Have:

• Familiarity with schema registries (e.g., Confluent Schema Registry) and Avro/Protobuf
• Experience with observability tooling (Prometheus, Grafana, ELK stack)
• Knowledge of caching layers (Redis, Memcached)
• Experience using AI-assisted development tools (e.g., Claude Code, GitHub Copilot) to accelerate coding, debugging, and refactoring workflows
• Comfort integrating AI coding agents into CI/CD or developer tooling pipelines

Priorexperience in [your industry, e.g., fintech, e-commerce]