Senior Backend Developer (Java or Kotlin)

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.

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

Requirements

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

Nice to have

Familiarity with Postgres, Kafka, REST APIs, Reactive Programming (Reactor), and monitoring tools like Grafana and Prometheus