Senior Backend Engineer

SIX · Madrid, Community of Madrid, Spain

Location

Madrid

Job Type

Full-time

Posted

May 31, 2026

Job Description

What You Will Do

Design, develop, and maintain backend services and REST APIs using Java, Spring, and Spring Boot

Build and operate event-driven services using Apache Kafka

Develop and maintain applications running on Java application servers such as WildFly

Collaborate with engineers and architects on system design, architecture, and technical improvements

Ensure reliability, scalability, and performance of production systems
What You Bring 
Very strong experience with Java backend development and modern backend design principles

Experience with Spring and Spring Boot for building microservices

Experience with Kafka or other messaging / event-streaming platforms

Knowledge of Wildfly/JBOSS is a big plus

Experience designing RESTful APIs and working with SQL databases

High english level, both writen and spoken, to interact with ou...

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