Kotlin Backend Engineer - (Freelance/Service Agreement)

<p style="line-height: 1.4;"><span style="font-size: 12pt;">We are looking for a skilled <strong>Kotlin Backend Engineer</strong> for service agreement collaboration. B2B Sales &amp; Distribution team<strong> </strong>builds and operates the backend platform powering Flix's partner-facing ecosystem — including a self-management platform for partners, a back office portal for internal users, and an AI agentic bot supporting partner operations. The team is driving a significant modernization of its backend architecture and is working in an AI-native development environment.</span></p> <p><span style="font-size: 24pt;"><strong data-renderer-mark="true">Scope of services</strong></span></p> <ul> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Independent delivery of backend services in Kotlin and Spring Boot, including design, development, and maintenance</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Building and maintaining REST APIs used by internal and external partners</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Contributing to architectural decisions and technical modernization initiatives as a senior topic driver</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Improving observability, performance, and reliability of backend systems using DataDog</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Supporting CI/CD pipelines and cloud infrastructure on AWS and Kubernetes</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Working within an AI-native development environment, including CI-integrated code review automation and an internal Claude Code plugin marketplace covering Kotlin/Spring Boot conventions, architectural patterns, testing practices, and database guidelines</span></li> <li style="font-size: 12pt;"><span style="font-size: 12pt;">Sharing Kotlin expertise and best practices with existing engineers on the Flix team who are transitioning from other languages, through code review, pairing, and technical guidance</span></li> </ul> <p><span style="font-size: 12pt;"><span style="font-size: 24pt;"><strong data-renderer-mark="true">Relevant expertise</strong></span></span></p> <ul> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">4+ years of software engineering experience, primarily backend development with a JVM language, including some commercial experience with Kotlin</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">Hands-on Spring Boot experience</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">Experience building and maintaining REST APIs and distributed systems</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">Solid SQL knowledge and relational database design, including MySQL and PostgreSQL</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">Sound software engineering fundamentals and clean code practices</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">Clear written and spoken English communication skills</span></li> <li class="font-claude-response-body whitespace-normal break-words pl-2" style="font-size: 12pt;"><span style="font-size: 12pt;">Preferred experience with: AWS, Kubernetes, GitLab CI/CD, Kafka, Terraform, LLM integrations, RAG systems, AI product development, or legacy system migration experience</span></li> </ul> <p><span style="font-size: 12pt;"><span style="font-size: 24pt;"><strong data-renderer-mark="true">Collaboration model</strong></span></span></p> <ul> <li style="font-size: 12pt;" data-pm-slice="1 1 ["bulletList",{},"listItem",{}]"><span style="font-size: 12pt;">Cooperation based on a service agreement with independent delivery of agreed services and invoicing</span> <div>&nbsp;</div> </li> </ul> <p><iframe src="https://www.youtube.com/embed/YlHz7TiiRAw" width="560" height="314"></iframe></p>