TEF/TCF Evaluator
AI feedback for the French TEF and TCF exams, mapped to CEFR levels A1 to C2. Live.
- Founder, architect and full-stack developer
What it is
The same evaluation platform rebuilt for French: TEF and TCF writing and speaking tasks are scored criterion by criterion, mapped to a CEFR level, and tracked over time with charts.
The problem
Candidates preparing for Canadian immigration and French-language exams need frequent, structured feedback. The product also had to support two payment providers, promotions and a free trial without hand-run admin work.
Architecture
Requests flow left to right. Hover a component for its role.
- React web app client, TypeScript, Tailwind, Nivo
- Google OAuth external
- Django REST API service, SimpleJWT, credits
- Stripe and PayPal external
- PostgreSQL data
- Redis queue, broker
- Celery workers worker, async evaluation
- GPT-4 and Whisper ai
Key decisions
A product line, not a copy
The IELTS architecture was generalised so the exam, criteria and level mapping are configuration. TEF/TCF adds CEFR mapping and a second payment provider on the same skeleton.
Practice mode costs nothing
Tests can be taken without AI evaluation and without spending credits, which keeps casual practice cheap to serve.
Highlights
- Listening, reading, writing and speaking practice, with admin tools for each question bank.
- Speaking tasks recorded in the browser, transcribed with Whisper and scored with GPT-4.
- Reports with Nivo charts, criterion-level feedback and CEFR level mapping.
- Credits with 1, 3, 6 and 12-month plans, a 7-day trial with 5 credits a day, and promo codes with usage limits.
- Admin panel for questions, users, bulk credit adjustments and settings.