Why REST-Based Video Uploads Failed — and Why We Moved to Azure Communication Services

At AIHYR, an AI-driven interview platform, we focus on building reliable and scalable interview experiences where every candidate interaction can be accurately evaluated. In such systems, consistent audio and video recording is not just a feature, it is a critical requirement. As our platform scaled to real-world usage, we began encountering reliability issues in how interview recordings were captured. Real-time communication platforms like Azure Communication Services (ACS), which are commonly used in applications such as telemedicine, virtual consultations, and customer support systems, are designed to handle these challenges more effectively. Inspired by these use cases, we transitioned from a file upload–based approach to a real-time media architecture. The Original Approach: REST-Based Media Uploads In a production interview platform, we initially relied on REST-based APIs to upload video and audio recordings for each answer directly from the browser to backend services. This appr