Backend Kotlin Engineer - Freelance

Description Keystone AI is a trusted partner in digital commerce. The company helps leading brands modernize B2B solutions, marketplaces, and retail ecosystems. Since 2008, it has empowered businesses with cutting-edge technology, AI-powered personalization, and world-class engineering and design teams. A certified B Corporation®, Keystone AI is trusted by major brands including IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted. How freelancing works at Keystone AI? As a , you can choose what works well for you. You decide when, where, and how you work on projects and tasks. We match you with work that fits your skills. Plus, you have access to various opportunities across different industries and companies. That means you will not only gain more experience, but also develop various skills. But there's more. Keystone AI freelancers can benefit from full-time collaboration and really be a part of the team. So, are you ready to make an impact? Join Keystone AI, and let's build beautiful software together. Currently we are looking for a Backend Kotlin Engineer Salary range (Regular): from 70 PLN/h Engagement: fulltime Working Hours: CET Start date: around mid July 2026 Project duration: minimum 6 months Requirements Good command of written and spoken English. Located in European Union Kotlin Kubernetes Event-driven systems (Kafka) CI/CD for mobile and backend applications DevOps collaboration Certification and compliance processes Benefits In return, we offer: 100% remote, flexible work. Work with an experienced team of developers and continuous development of your hard and soft skills. Dev-friendly processes such as Continuous Integration, Continuous Delivery, Code Review and bug bashes. Long-term collaboration on challenging products (FinTech, B2B software, E-commerce and more). Here's what you can expect from the recruitment process: First, you'll meet with one of our recruiters to get to know each other better. If everything goes well, you'll have the opportunity to meet with the client during online interviews. Don't hesitate and apply right away! At Keystone AI, we're committed to creating an inclusive environment for everyone. If you require any disability-related adaptations during the recruitment process, please let us know. We're here to help!