A
At
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.
- ?
100% remote
.

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