Mandatory Internship(Unpaid): Backend / Full-Stack Developer for AI SaaS

IndieKidz GmbH is a Berlin-based early stage startup building creative learning products for children. Our software product, Occibo, is an AI-assisted childrens book creation platform. It helps authors, parents, teachers, and small publishers turn a manuscript into a complete childrens book workflow, including editing, illustration planning, character consistency, layout, export, and promotional assets. We are looking for a motivated Backend / Full-Stack Developer Intern to support the development of Occibo mainly open to work in early stage startup. Duration: 36 months / Compensation: Unpaid mandatory internship Tasks You will work on the technical development of Occibo, mainly on backend services, APIs, database logic, file handling, AI workflow integration, and selected full-stack features. This role is ideal for a student who wants hands-on experience building a real SaaS product using modern backend and AI infrastructure. " Build and improve backend APIs using Node.js, TypeScript, and Express.js " Work with Supabase for database, authentication, and data management " Support file storage workflows using Cloudflare R2 " Help build AI workflow orchestration for book creation, illustration, layout, and export " Work with queue-based processing using Redis and BullMQ " Support integration with AI image-generation workflows such as ComfyUI " Create clean, maintainable, and well-documented code " Debug, test, and improve existing backend services " Support selected frontend or full-stack tasks when needed " Collaborate with product, design, and content team members Requirements " You have hands-on knowledge of JavaScript / TypeScript " You understand backend development, APIs, databases, and Git " You are interested in early stage AI, SaaS products, and product development " You can work independently in a remote setup " You write clean code and are willing to learn " You are reliable, curious, and proactive Benefits " Real experience building an AI SaaS product from early stage " Hands-on work with modern backend and AI infrastructure " Exposure to product thinking, architecture, and startup execution " Opportunity to work directly with the founder " Remote and flexible working setup " Internship certificate after successful completion " Recommendation letter based on performance Company IndieKidz GmbH / Occibo Location Remote Employment Type Mandatory Internship / Pflichtpraktikum Duration 36 months Compensation Unpaid mandatory internship Please send us: Your CV GitHub profile or portfolio Short note explaining why you are interested in this internship Your required internship duration and earliest start date Find Jobs in Germany on Arbeitnow