• Users should be able to create and account and subscribe for a plan.
• Users should be able to manage multiple profiles.
• Users should be able to search for a video title.
• Users should be able to watch a video.
• Netflix employees should be able to upload a video from backend to make it available on Netflix platform.

• System should be highly reliable. Any video uploaded should not be lost.
• System should be highly available.
• Users should be able to stream videos in Realtime without any lag.

• Video recommendations

• Most popular videos

• Subtitles

• Grouping of videos (e.g. TV Series, treat each video as independent)

• Average number of videos users watch daily = 3

• Number of videos watched per second= (#active users _ #average videos watched daily)/86400 = 3472(100M _ 3/86400)

• Size of the content stored on a daily basis = #average size of video uploaded every min _ #pairwise combination of resolutions and codecs _ 24_ 60 = 36 TB/day (=2500MB _ 10 _ 24 _ 60)

Let’s do some back-of-the-envelope calculations to estimate the bandwidth and storage required.

• Total number of daily active users = 100 million
• Average number of videos watched by each user per day = 5
• Average size of one video = 500 MB
• Average number of video uploaded per day from backend = 1,000