Senior Java Developer | AWS, RxJava, Microservices

Ust España & Latam; Guadalajara; Presencial; EUR 90.000 - 120.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Health Care Plan

Internet Connectivity

Life and Accident Insurances

Flexible Compensation Program

Training platforms

Descripción de la vacante

UST seeks aSenior Java Developer to design, build, and evolve mission-critical backend services in Java 17/21 using Spring Boot and cloud-native architectures. You will implement scalable microservices, reactive patterns, and gRPC APIs while working with Kafka and modern data stores in an AWS environment.

The role emphasizes strong concurrency, comprehensive testing, and collaboration across teams to deliver robust, production-grade systems with clear documentation.

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 expertise in Spring Framework and Spring Boot in production.
• Experience with reactive programming (Project Reactor or RxJava) or advanced asynchronous patterns.
• Production experience with gRPC and Protocol Buffers, including streaming RPCs and schema evolution.
• Solid understanding of concurrency fundamentals and thread lifecycle management.
• Good testing practices with JUnit 5, Mockito, and AssertJ.
• Experience with Kafka consumer/producer semantics.
• Cloud experience with AWS (S3, IAM, Kafka services) and container runtimes.
• Excellent written English (C1+).

Responsabilidades

• Design, develop, and maintain backend services using Java 17/21 and Spring Boot.
• Build scalable microservices with reactive programming principles.
• Develop and maintain gRPC APIs and Protobuf schemas with backward compatibility.
• Implement highly concurrent and performant solutions with proper thread-safety.
• Work with Kafka-based event-driven architectures and production data stores.
• Create and maintain automated test suites (unit, integration, contract).
• Collaborate on architecture decisions, design reviews, and technical docs.
• Troubleshoot, perform root cause analysis, and postmortems.
• Contribute to CI/CD pipelines, cloud infrastructure, and container deployments.
• Produce clear design documents and PR descriptions.

Conocimientos

Java

Spring Boot

Reactive programming

gRPC & Protobuf

Kafka

Concurrency

JUnit/Mockito

AWS

Databases

Descripción del empleo

UST seeks aSenior Java Developer to design, build, and evolve mission-critical backend services in Java 17/21 using Spring Boot and cloud-native architectures. You will implement scalable microservices, reactive patterns, and gRPC APIs while working with Kafka and modern data stores in an AWS environment.

The role emphasizes strong concurrency, comprehensive testing, and collaboration across teams to deliver robust, production-grade systems with clear documentation.