Textutor AI Platform

Led technical architecture for AI-powered essay correction and grading system at GoGymi

Description:

Led technical architecture for TexTutor, an AI-powered educational SaaS platform for Swiss teachers and students. Built full-stack product foundations across authentication, billing, multilingual product flows, AI grammar correction, collaboration, and deployment workflows.

Project Duration:

2024 - 2025 (Technical Lead, Freelance)

Key Technical Achievements:

  • AI Integration Excellence: Built sophisticated GPT-4 integration with function calling for structured educational assessment
  • Multi-Language Processing: Implemented LanguageTool integration supporting English, German, Spanish, French, and Italian with cultural adaptations
  • Real-Time Collaboration: Architected Yjs-powered collaborative editing with live feedback, comments, and presence indicators
  • Database Architecture: Designed complex 16-table PostgreSQL schema with audit trails, versioning, and educational analytics
  • Product Foundation: Delivered production-ready dashboards, billing, authentication, AI correction workflows, and deployment infrastructure
  • Hybrid Grading System: Implemented AI-human hybrid grading workflow for quality assurance

Technical Implementation:

  • AI/ML Stack: OpenAI GPT-4 with function calling, Google Gemini, Custom prompt engineering
  • Frontend: Next.js 15, React 19, TypeScript, Tailwind CSS, Yjs for collaboration
  • Backend: Python FastAPI, PostgreSQL with Drizzle ORM, Redis for caching
  • Language Processing: LanguageTool API integration, Custom grammar rules, Multi-language support
  • Real-time Features: WebSocket connections, Presence tracking, Live cursor positions

Business Impact:

  • Delivery: Contributed 550+ commits across frontend, backend, billing, authentication, AI workflows, and deployment
  • Monetization: Implemented Stripe subscriptions with webhooks, trials, usage tracking, plan enforcement, and billing dashboards
  • Localization: Built multilingual product flows and transactional communication across English, German, French, Spanish, and Italian

Technical Innovations:

  • Structured Assessment: GPT-4 function calling for consistent, rubric-based grading
  • Cultural Adaptation: Language-specific feedback patterns and educational conventions
  • Audit System: Complete history tracking for educational compliance
  • Collaborative Infrastructure: Real-time multi-user editing with conflict resolution

Skills Demonstrated:

Technical Leadership, AI/ML Integration, Database Design, Real-time Systems, Educational Technology, Multi-language Processing, System Architecture, Performance Optimization