Design
Live Video Streaming Platform (Twitch-like)
Design a platform for low-latency live video broadcasting from a streamer to potentially millions of concurrent viewers.
This is a Low-Level Design (LLD) problem. New to LLD vs HLD? Start here.
01 - Why interviewers ask this
Live (not on-demand) streaming adds a hard latency constraint — interviewers check if you understand why HLS/DASH segment size is a latency-vs-scale trade-off, not a free choice.
02 - Where this system exists in the real world
You interact with this design every day.
Twitch / YouTube Live streaming platforms
Live sports and event broadcasting
Livestream shopping/commerce platforms
03 - What you'll master
Solve this once. Know it forever.
Design a low-latency ingest-to-CDN pipeline
Understand adaptive bitrate for live streams
Reason about the latency vs. scale trade-off
04 - What you'll design
6 functional · 3 non-functional requirements.
Ingest a live video stream from a broadcaster
5 more requirements inside
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05 - Companies that ask this
You may face this exact question in your next interview.
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