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 children’s book creation platform. It helps authors, parents, teachers, and small publishers turn a manuscript into a complete children’s 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: 3–6 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 3–6 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