[Technical Verification] Creating a "Strict English Coach" with Gemini 3 Flash (Next.js + Python)

This article details the development of an AI-powered English pronunciation coach named EchoPerfect, leveraging Google's Gemini 3 Flash model. It explores the model's real-time voice analysis capabilities and the integration of Next.js (App Router) with Python (FastAPI) for a hybrid architecture. The author shares insights into the technical challenges and solutions encountered during the development process, focusing on creating a more demanding and effective AI language learning experience compared to simple conversational AI. The article provides practical knowledge for developers interested in building similar applications using cutting-edge AI models and web technologies. It highlights the potential of multimodal AI in language education.