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Engcall
Visit →A phone-based English conversation service I solo-built and operate. Created out of frustration with overpriced, inflexible language services — Engcall connects Korean learners with Filipino tutors for 1:1 daily conversation practice. Everything from booking and payment to tutor management is handled through a system I designed and developed alone.
Tech Stack
ReactTypeScriptSpring BootJavaMariaDBAWS EC2NginxToss Payments
Features
Speaking Analysis →
Upload or record English audio and get detailed AI analysis — powered by OpenAI Whisper for transcription and GPT-4o for grammar correction, vocabulary suggestions, and scoring across four categories.
Phone Call →
1:1 voice call system built with Agora SDK — real-time token auth, session lifecycle management via HTTP polling, and AI-powered noise suppression for stable daily English lessons.