DKB Code Factory in Valencia is seeking a Senior Backend Developer (Java or Kotlin) to own core backend services. This hybrid role offers ownership of key domains, mentorship of peers, and opportunities to grow technical leadership in a collaborative team. You will deliver end-to-end backend features, drive code quality, and align with Product, QA, DevOps. Strong Java/JVM and Spring Boot, plus Kotlin curiosity, are valuable as you shape scalable, secure systems and help the team excel.