Junior Back End Engineer (Java Spring Boot / Quarkus)

PT Loren Tech Solutions; Jakarta Pusat; On-site; IDR 72,540,000 - 78,120,000; Full time

Job summary

PT Loren Tech Solutions is seeking a Backend Engineer for a 12-month contract, onsite in Jakarta. You will work on scalable microservices using Java 17+ or Kotlin, with Spring Boot or Quarkus in production.

The role requires strong knowledge of reactive programming, database design and query optimization, and familiarity with Docker and Kubernetes. Prior experience with event-driven architectures is a plus. This is a full onsite position with performance-based extension depending on results.

Qualifications

• Min. 2 years of experience as a Backend Engineer.
• Proficient in Java (17+) or Kotlin, with Spring Boot or Quarkus in production.
• Strong reactive programming knowledge (Project Reactor, RxJava, or Mutiny).
• Solid database design, indexing, and query optimization skills.
• Familiar with Docker and Kubernetes.

Skills

Java 17+

Kotlin

Reactive programming

Database design

Docker

Kubernetes

Spring Boot

Quarkus

Tools

Spring Boot

Quarkus

Docker

Kubernetes

Job description

Employment Type: Contract (12 Months, extendable based on performance)

Work Arrangement: Full Onsite

Salary: Rp.6.500.000 Gross - 7.000.000 Gross (Base on experience)

Requirement

Must Have

• Min. 2 years of experience as a Backend Engineer.
• Strong proficiency in Java (17+) or Kotlin.
• Experience with Spring Boot or Quarkus in production environments.
• Good understanding of reactive programming (Project Reactor, RxJava, or Mutiny).
• Strong knowledge of database design, indexing, and query optimization.
• Familiar with Docker and Kubernetes.

Nice to Have

• Experience with event-driven architecture (Kafka or RabbitMQ).
• Familiar with Quarkus native build (GraalVM).
• Experience with distributed systems (Saga Pattern, CQRS, etc.).
• JVM performance tuning experience (GC tuning, profiling).
• Contributions to Java or Go open-source projects.