Unpaid Mandatory Internship - Backend Engineer (Nodejs/TS) @ Early stage startup gesucht in Berlin

• Build(from scratch) and improve backend services & APIs for core product workflows using Node.js, TypeScript, and Express
• Work on Supabase/PostgreSQL based data models, authentication, and API integrations
• Develop job based systems using Redis and BullMQ/Message queue for image generation, processing, and export workflows
• Integrate and support AI systems including LLM driven flows and ComfyUI based image pipelines
• Manage file handling, storage, and delivery using object storage services
• Help improve reliability, performance, and developer experience across the backend stack
• Work closely with product, design, and frontend to ship real features fast

• Must - Hands on experience with Node.js, TypeScript, and backend API development
• Familiarity with databases, authentication, queues, and async job processing
• Interest or experience in AI systems, LLM workflows
• Experience in building API services
• Familiarity with tools such as Cursor and GitHub Copilot is required
• Comfortable building fast, learning quickly, and working in an early stage startup environment

Nice to have

• Previous internship, project, or open source work in SaaS or AI products
• Interest in creative tools, publishing, or workflow products, This role is for someone with hands on exposure to a similar backend stack who wants to build real systems, move fast, and learn by shipping. You should enjoy backend engineering, AI driven products, and solving practical product problems with strong ownership.

• Real hands on experience building a production grade AI product
• Exposure to backend architecture, AI workflows, and startup execution
• Ownership of meaningful features, not support tasks
• Close collaboration with the founder and product team