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# Java Engineer - AWS & Reactive Microservices

- **Company:** Ust
- **Location:** Madrid, Spain
- **Salary:** €70,000.0 - €110,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Amazon Web Services, Cloud Engineering, Spring Framework, Spring-boot, Apache Kafka, Reactive Programming, Cloud Optimization, Grpc, Microservices
- **Published:** August 29, 2026
- **Apply:** https://www.jobleads.com/es/job/e75836363f3cf19851b8aaa305bd7ee48

## About the Role

The role requires strong Java expertise, production experience with Spring and Kafka, and cloud usage (AWS). Excellent communication and English (C1) are essential.

## Description

UST is seeking a Senior Java Developer to design, develop, and evolve mission-critical applications using Java 17/21, Spring Boot, and cloud-native architectures. You will work on scalable microservices, reactive programming, and gRPC with a focus on performance and scalability.


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