Senior Backend Engineer (Java/Kotlin) - Hybrid in Valencia

DKB Code Factory GmbH; Valencia; Hybrid; EUR 55,000 - 70,000; Full time

Job summary

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.

Qualifications

• Strong proficiency in the Java/JVM ecosystem.

Responsibilities

• Deliver complex backend features end-to-end with minimal supervision, ensuring high quality and timely completion.
• Mentor and support other developers through code reviews, pairing, and knowledge sharing to boost team capability.
• Take ownership of core functions or domain areas within the team and expand influence across multiple teams.
• Lead efforts to improve team processes, including code quality, testing, and documentation standards.
• Collaborate closely with Product Owners, QA, DevOps, and fellow engineers to deliver reliable, scalable solutions.
• Serve as a technical expert and informal leader, fostering continuous improvement and technical excellence.

Skills

Java/JVM

Spring Boot

Kotlin learn

Backend design

Performance & security

SDLC & CI/CD

Communication

Mentoring

Continuous learning

Postgres/Kafka/REST/Reactive

Tools

Grafana

Prometheus

PostgreSQL

Kafka

Reactor

Job description

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.