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