Senior Backend Developer (Java or Kotlin)

DKB Code Factory; 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

Senior Backend Developer (Java or Kotlin)

Welcome to DKB Code Factory….

Join DKB Code Factory as a Backend Developer and take on a pivotal role driving the technical excellence and delivery of core backend services. This hybrid position in Valencia offers the chance to grow your leadership skills, own key system domains, and mentor peers within a collaborative, high-impact team.

{ your_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.

{ following_qualifications_would_be_in_line_with_our_desired_profile_for_this_position: [

• Strong proficiency in the Java/JVM ecosystem.
• Experience building backend applications with Spring Boot.
• Clear motivation to learn and adopt Kotlin as a primary language, with motivation to grow into it quickly.
• Proven ability to design and implement complex backend solutions simply and effectively.
• Solid understanding of performance, security, and maintainability best practices.
• Experience across full software development lifecycle and CI/CD workflows.
• Excellent communication skills and a collaborative mindset.
• Demonstrated willingness to mentor and support team members.
• Curiosity and commitment to continuous learning and pragmatic problem-solving.
• Familiarity with Postgres, Kafka, REST APIs, Reactive Programming (Reactor), and monitoring tools like Grafana and Prometheus is a plus

From Morning Daily to Afterwork Drink, team spirit is essential to us. The heart of our togetherness is that we truly are connected with each other: We not only share fun & laughter, but also honest opinions - because that's how we grow: We exchange ideas, give support in our personal development, and celebrate success together! Besides our great community, we also offer numerous other benefits ...