AAt SQUAD Technology Solutions, an IT outsourcing company, we are building a small, agile team with a strong commitment to doing things right from the very beginning.
We are currently working with one of our clients to hire a Java Senior Developer with reactive programming for a project in the banking sector.
What are we looking for?

8+ years of Java development experience, including Java 17/21, modern language features, concurrency, and high-performance backend systems.
Strong expertise with Spring Boot, Project Reactor, RxJava, and CompletableFuture to build scalable and reactive microservices.
Hands-on experience with gRPC & Protobuf, including streaming RPCs, interceptors, deadlines, and API/schema evolution.
Solid background in Kafka, Redis, PostgreSQL, and MongoDB,



delivering event-driven and data-intensive applications.
Strong cloud experience on AWS (S3, IAM, Managed Kafka, container runtimes) and modern distributed architectures.
Expertise in Docker, multi-architecture container images (amd64/arm64), CI/CD, and cloud-native deployment practices.
Experience leading large-scale refactoring or migration projects in multi-module codebases, with strong communication skills and C1 English; Python knowledge is a plus.

What are we offering?

Freelance contract with immediate onboarding.
Stable and full time project with an international client.

📌 Senior Java Developer (España)
🏢 SQUAD Technology Solutions
📍 España