Java Backend Developer – Spring Boot & Microservices

Kop. Nusantara; Jakarta Selatan; On-site; IDR 36,000,000 - 60,000,000; Full time

Job summary

Kop. Nusantara in Jakarta Selatan is seeking a backend engineer to develop and maintain scalable Java services using Spring Boot. You will build RESTful APIs with security and robust validation, monitor production systems via ELK, and optimize database performance.

The role includes migrating Java versions, implementing Redis caching, and working with RabbitMQ/Kafka for messaging. Collaboration with cross-functional teams is essential to deliver reliable fintech-grade systems.

Qualifications

• Bachelor’s degree in Computer Science, Information Systems, or related fields.
• 2+ years of professional experience in Java backend development.
• Strong knowledge of Java 8/21+, OOP, Spring Boot, Spring Security, JPA/MyBatis.
• Strong SQL and relational database knowledge, including joins, indexing, and query optimization.
• Hands-on experience with Git, Docker, Linux, CI/CD, and unit/integration testing.
• Familiar with Redis, RabbitMQ/Kafka, ELK/Kibana, microservices, JWT/OAuth2, RBAC, and OWASP.
• Strong analytical and problem-solving skills.
• Experience in fintech, financial, or high-transaction systems is a plus.

Responsibilities

• Develop and maintain scalable backend services using Java & Spring Boot.
• Build and maintain RESTful APIs, including security, validation, exception, and transaction handling.
• Troubleshoot production issues through root-cause analysis, log analysis, and ELK/Kibana monitoring.
• Optimize SQL queries, database performance, and application scalability.
• Support Java 8 → Java 21+ migration and code modernization.
• Implement Redis caching and asynchronous/messaging solutions using RabbitMQ/Kafka.
• Collaborate with Product, QA, DevOps, Infrastructure, and Security teams.

Skills

Analytical thinking

Problem solving

Team collaboration

Education

Bachelor's degree in Computer Science/Information Systems

Tools

Java

Spring Boot

Spring Security

JPA/MyBatis

REST APIs

Redis

RabbitMQ

Kafka

ELK/Kibana

Git

Docker

Linux

CI/CD

JWT/OAuth2

RBAC

OWASP

Microservices

SQL

Job description

Kop. Nusantara in Jakarta Selatan is seeking a backend engineer to develop and maintain scalable Java services using Spring Boot. You will build RESTful APIs with security and robust validation, monitor production systems via ELK, and optimize database performance.

The role includes migrating Java versions, implementing Redis caching, and working with RabbitMQ/Kafka for messaging. Collaboration with cross-functional teams is essential to deliver reliable fintech-grade systems.