Client Snapshot
TCF is an AI-powered voice platform built for students preparing for French and English language proficiency exams. It replicates real exam conditions and delivers CEFR-aligned feedback instantly — no human examiner required.
Built by Infi Web Solutions as a full-stack AI product, combining speech recognition, real-time AI evaluation, and a clean learner-focused UI.
- AI-driven speaking exam simulation
- 3 structured, timed exam tasks
- Real-time speech transcription & evaluation
- CEFR-level feedback (A1 – C2)
- Subscription-based access via Stripe
- Globally accessible, serverless infrastructure
The Challenge
Language exam preparation has a fundamental problem: students need consistent, realistic speaking practice — but access to qualified human examiners is expensive, time-limited, and often inconsistent in evaluation quality.
TCF needed a platform that could:
- Practice anytime without booking a tutor
- Receive objective, consistent scoring
- Understand performance gaps clearly
- Experience real exam-level pressure and timing
- Real-time, low-latency speech processing
- Accurate multilingual transcription
- Intelligent CEFR-level scoring engine
- Scalable for global learner base
Our Solution: AI That Thinks Like an Examiner
Infi Web Solutions built a voice agent that doesn’t just record speech — it listens, understands, and evaluates the way a trained language examiner would. Every component of the platform was chosen to bring that intelligence to life at scale.
How It Works — The Evaluation Pipeline
Exam Simulation Structure
The platform is divided into three exam-style tasks that directly mirror the structure of the TCF exam. Each task has its own timing, instructions, and evaluation criteria — creating an authentic exam environment from the first session.
Intelligent guardrails monitor learner behavior throughout. If a user pauses too frequently or breaks task flow, the system gently nudges them back — maintaining the pressure and pacing of a real exam without human intervention.
AI Evaluation & Feedback System
After each task, the AI produces a multi-dimensional assessment aligned to CEFR standards. Learners don’t just receive a score — they receive insight.
All scores are mapped to the learner’s current CEFR level, providing a clear, internationally recognized benchmark. Progress is trackable across sessions, allowing students to see measurable improvement over time.
Technology Stack
Every tool in the stack was chosen deliberately — for performance, accuracy, and the ability to work together in a low-latency real-time environment.
| Tool | Role | Why It Was Chosen |
|---|---|---|
| OpenAI | AI Brain | Intelligent response evaluation, CEFR-level analysis, and natural language understanding |
| OpenAI Realtime | Live Voice I/O | Low-latency text-to-speech and speech-to-text for seamless real-time conversation |
| Deepgram | Speech Transcription | High-accuracy real-time transcription that captures nuanced learner speech reliably |
| Supabase | Auth & Database | Secure JWT authentication, Row-Level Security, and scalable serverless data storage |
| Stripe | Payments | Subscription and payment handling with enterprise-grade reliability |
| React | Frontend UI | Clean, responsive interface optimized for distraction-free speaking practice |
Security & Scalability
— JWT Authentication
Every user action is verified with secure, tamper-proof tokens. Sessions are managed and validated in real time.
— Row-Level Security (RLS)
Supabase RLS ensures each learner can only access their own data. Even direct database queries by unauthorized users return nothing.
Together, JWT + RLS deliver authentication, authorization, and fine-grained data control in a single cohesive layer.
The platform is built on Supabase’s serverless infrastructure, meaning it scales automatically with user demand — no manual provisioning required.
- Handles concurrent exam sessions globally
- Conversation and score data grows without limits
- Modular architecture allows new features to be added independently
- No performance degradation at scale
User Experience & Engagement
The platform was designed around one principle: make it feel like a real exam, not a practice tool. Every UX decision reinforces that experience.
Results & Impact
TCF launched as a production-ready AI platform — not a prototype. Here’s what was delivered:
Client Perspective
“The AI evaluates speaking just the way a real examiner would — our students get meaningful, consistent feedback every single time they practice.”
— TCF Platform Team — [Add actual quote & name here]
Why Infi Web Solutions
TCF is one example of how Infi Web Solutions builds AI-powered products that are ready for real users from day one — not demos, not MVPs held together with workarounds.
- Deep expertise in AI integration: OpenAI, Deepgram, real-time voice pipelines
- Full-stack product thinking — from architecture to user experience
- Security and scalability built into the foundation, not added later
- Rapid delivery without sacrificing quality or reliability
- Long-term partnership focus — we build platforms, not just features