Senior Java API Developer

Flintex Consulting Pte Ltd; Kuala Lumpur; On-site; MYR 89,000 - 112,000; Full time

Job summary

Flintex Consulting Pte Ltd in Kuala Lumpur, Malaysia is seeking a Senior Java API Developer to design, develop, and optimize scalable backend services and RESTful APIs. You will mentor junior developers and drive engineering best practices across the team.

The role requires hands-on coding ability, architectural thinking, and experience building production-grade APIs in cloud or enterprise environments.

Qualifications

• 5+ years of backend development experience.
• Strong expertise in Java (8/11/17+).
• Experience with Spring Boot, Spring MVC, Spring Security.
• Experience with microservices architecture.
• Strong knowledge of SQL and ORM frameworks (Hibernate/JPA).
• Experience with API security (OAuth2, JWT).
• Familiarity with Git, Maven/Gradle.

Responsibilities

• Design, develop, and maintain scalable RESTful APIs and microservices using Java and Spring Boot.
• Architect secure, high-availability backend systems with performance optimization in mind.
• Implement clean, testable, and maintainable code following SOLID principles.
• Optimize application performance, troubleshoot bottlenecks, and resolve production issues.
• Collaborate with frontend developers, DevOps, QA, and product teams to deliver high quality features.
• Participate in architecture discussions and technical design reviews.
• Implement API security standards (OAuth2, JWT, API Gateway policies).
• Ensure code quality through unit testing, integration testing, and code reviews.
• Mentor junior developers and promote engineering best practices.
• Contribute to CI/CD pipelines and DevOps improvements.

Skills

Java

Spring Boot

RESTful APIs

Microservices

SQL / ORM (Hibernate/JPA)

OAuth2 / JWT

Multithreading

Tools

Git

Maven/Gradle

Docker

CI/CD

Job description

Full time | Flintex Consulting Pte Ltd | Malaysia

Posted On 05/08/2026

Job Information

Work Experience 5+ years

Technology

MYR 8000 - MYR 10000

City Kuala Lumpur

State/Province Wilayah Persekutuan Kuala Lumpur

50000

Job Description

Position Summary

We are looking for a highly skilled Senior Java API Developer to design, develop, and optimize scalable backend services and RESTful APIs. You will play a key role in architecting secure, high-performance systems, mentoring junior developers, and driving engineering best practices across the team.

This role requires strong hands-on coding ability, architectural thinking, and experience building production-grade APIs in cloud or enterprise environments.

Key Responsibilities

• Design, develop, and maintain scalable RESTful APIs and microservices using Java and Spring Boot.
• Architect secure, high-availability backend systems with performance optimization in mind.
• Implement clean, testable, and maintainable code following SOLID principles.
• Optimize application performance, troubleshoot bottlenecks, and resolve production issues.
• Collaborate with frontend developers, DevOps, QA, and product teams to deliver high quality features.
• Participate in architecture discussions and technical design reviews.
• Implement API security standards (OAuth2, JWT, API Gateway policies).
• Ensure code quality through unit testing, integration testing, and code reviews.
• Mentor junior developers and promote engineering best practices.
• Contribute to CI/CD pipelines and DevOps improvements.

Technical Requirements

Requirements

• 5+ years of backend development experience.
• Strong expertise in Java (8/11/17+).
• Solid experience with Spring Boot, Spring MVC, Spring Security.
• Experience with microservices architecture.
• Strong knowledge of SQL (MySQL/PostgreSQL/Oracle) and ORM frameworks (Hibernate/JPA).
• Experience with API security (OAuth2, JWT).
• Familiarity with Git, Maven/Gradle.
• Experience working with Docker and CI/CD pipelines.
• Strong understanding of data structures, concurrency, and multithreading.

Good to Have

• Experience with Kafka or RabbitMQ.
• Cloud deployment experience (AWS, Azure, or GCP).
• Experience with API documentation tools (Swagger / OpenAPI).
• Experience in fintech or high-transaction systems.

Soft Skills

• Strong analytical and problem-solving skills.
• Ability to work independently and lead technical initiatives.
• Excellent communication and stakeholder management skills.
• Proactive mindset with ownership mentality