Senior Java Backend Engineer - Cloud & Microservices (Remote)

Ust España & Latam

Barcelona

Híbrido

EUR 90.000 - 120.000

Jornada completa

Hace 5 días
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Ventajas ofrecidas por este puesto de trabajo

Annual leave 23 days
Health care plan
Flexible compensation
Training platforms
Career development plan
Referral bonuses
12/14 salary payments
Work-life balance
UST Club discounts

Descripción de la vacante

UST is seeking a highly skilled Senior Java Developer to join our engineering team in Barcelona. You will design, develop, and evolve mission-critical applications using Java 17/21, Spring Boot, and cloud-native architectures.

Work with Kafka-based event-driven systems, gRPC and Protobuf, and implement highly concurrent, performant solutions with reactive programming and structured concurrency. You will contribute to CI/CD pipelines, create technical documentation, perform testing, and

Formación

  • 8+ years of professional Java development experience.
  • 3+ years with Java 17/21 and modern features (records, sealed classes, pattern matching, virtual threads).
  • Strong Spring Framework/Boot experience in production environments.
  • Experience with reactive programming (Project Reactor/RxJava) or async patterns.
  • Production experience with gRPC and Protocol Buffers, incl. streaming RPCs and schema evolution.
  • Knowledge of concurrency fundamentals, executors, and thread lifecycle management.
  • Solid testing practices with JUnit 5, Mockito, and AssertJ.
  • Cloud experience with AWS (S3, IAM, managed Kafka, containers).
  • English level C1 or higher.

Responsabilidades

  • Design, develop, and maintain robust backend services with Java 17/21 and Spring Boot.
  • Build scalable microservices using reactive programming and event-driven architectures.
  • Develop and maintain gRPC APIs and Protobuf schemas with backward compatibility.
  • Ensure high performance and proper concurrency in production systems.
  • Work with Kafka-based event-driven architectures and data stores.
  • Create and maintain automated tests (unit, integration, contract).
  • Collaborate with cross-functional teams on architecture decisions and docs.
  • Contribute to CI/CD pipelines and cloud infrastructure.
  • Produce clear technical documentation and PR descriptions.

Conocimientos

Java
Spring Framework
Spring Boot
Reactive programming
gRPC
Protobuf
Kafka
AWS
Unit testing

Herramientas

Kafka
PostgreSQL
Redis
MongoDB
Protobuf

Descripción del empleo

UST is seeking a highly skilled Senior Java Developer to join our engineering team in Barcelona. You will design, develop, and evolve mission-critical applications using Java 17/21, Spring Boot, and cloud-native architectures.

Work with Kafka-based event-driven systems, gRPC and Protobuf, and implement highly concurrent, performant solutions with reactive programming and structured concurrency. You will contribute to CI/CD pipelines, create technical documentation, perform testing, and

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