Backend Java Developer - Microservices, Aws & Ai (Flex)

This is a hands-on backend role focused on performance, scalability, and clean engineering practices. What you’ll do Design, develop, and maintain backend microservices using Java and Spring Boot Build and maintain REST APIs Work with relational and non-relational databases Develop integration and unit tests Collaborate with cloud-native environments on AWS Participate in code reviews and technical discussions Contribute to scalable and maintainable backend architectures What we’re looking for +3 years of hands-on experience developing backend microservices with: Java Spring Boot Spring Batch PostgreSQL Experience working with: REST APIs JPA / Hibernate Relational and non-relational databases Caching technologies Experience with: AWS AWS S3/Lambda Git Maven Experience developing: unit tests (JUnit, Mockito) integration tests Spanish fluent/native level English B2 (spoken and written) - required Nice to have Knowledge of Go / Golang Experience in digital banking or high-transaction environments Experience working in distributed agile teams Work model Hybrid model available in: Madrid Barcelona Málaga Logroño Remote from other locations within Spain Note We are looking for backend-focused profiles with strong Java and microservices experience. Experience limited to document management platforms or unrelated enterprise systems will not be considered relevant for this role.