Java Backend Engineer — Reactive (Spring Boot/Quarkus)

PT Loren Tech Solutions; Indonesia; On-site; IDR 72,540,000 - 78,120,000; Part time

Job summary

PT Loren Tech Solutions in Indonesia is seeking a Backend Engineer for a 12-month contract to join our on-site team. The role focuses on building scalable services using Java (17+) or Kotlin, with Spring Boot or Quarkus, and reactive programming.

You will work with REST, gRPC, GraphQL, and modern JVM tools, Docker and Kubernetes, to deliver production-grade backend systems. Prior experience in distributed systems and performance tuning is a plus.

Qualifications

• 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.

Skills

Java (17+)

Kotlin

Go

Reactive programming

Spring Boot

Quarkus

Project Reactor

Mutiny

Spring WebFlux

REST

gRPC

GraphQL

Database design

Indexing

Query optimization

Docker

Kubernetes

Tools

Docker

Kubernetes

Job description

PT Loren Tech Solutions in Indonesia is seeking a Backend Engineer for a 12-month contract to join our on-site team. The role focuses on building scalable services using Java (17+) or Kotlin, with Spring Boot or Quarkus, and reactive programming.

You will work with REST, gRPC, GraphQL, and modern JVM tools, Docker and Kubernetes, to deliver production-grade backend systems. Prior experience in distributed systems and performance tuning is a plus.