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, drive engineering best practices, and contribute to secure, production-grade APIs in cloud or enterprise environments.

The role requires strong hands-on coding ability, architectural thinking, and experience with Spring Boot, microservices, and API security (OAuth2, JWT).

Qualifications

• 5+ years of backend development experience.
• Strong Java (8/11/17+) expertise.
• Hands-on with Spring Boot, Spring MVC and Spring Security.
• Experience with microservices architectures.
• Proficient in SQL (MySQL/PostgreSQL/Oracle) and ORM (Hibernate/JPA).

Responsibilities

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

Skills

Backend development

Java

Spring Boot

Microservices

SQL

Data structures

Multithreading

CI/CD

Git

Testing

Tools

Docker

Maven/Gradle

Swagger/OpenAPI

Git

Job description

Full time | Flintex Consulting Pte Ltd | Malaysia

Posted On 31/08/2026

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