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Hellointerview.com is the best! I bought the premium subscription, totally worth every penny. Apart from HelloInterview, I did not find any other resource which explains what is expected at Senior and Staff+.

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Senior & staff roles require depth in system design. You are expected to go beyond classical textbook answers. HelloInterview is a great resource to understand the 'staff' bar.

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Hello Interview became an absolute game changer, especially for system design... Hello Interview's system design content is outstanding: theory lessons, technology overviews, cheat sheets, practice questions, and especially the videos.

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For system design, I went through almost all the core system design questions and fundamentals on Hello Interview. This was actually my second time using Hello Interview to refresh my knowledge, and it helped a lot in rebuilding intuition quickly.

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Practicing System Design on Hello Interview was done by reading and understanding the article first, then build it by doing recall, and practicing going from Entities → APIs → DBs → Scaling/Deep Dives.

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I saw few Hellointerview free videos and their free articles on how to prepare for such rounds and I had to buy the premium as I felt it was a great resource for me to understand things and also what I was missing out.

Many of the resources on Hello Interview are free to use! Premium content is shown on the site with a lock icon if you do not have access to Premium. Hello Interview Premium gives you access to common question breakdowns, exclusive deep-dives, access to our full set of Guided Practice problems, and ranked lists of the most common questions at top companies.

If you have an active premium membership, a credit is auto-applied at checkout when you buy more time. For month or year purchases, that credit is a small fixed amount that stacks on top of any live discount. For lifetime purchases, the credit is prorated based on what you paid and the time remaining on your current membership, so the earlier you upgrade, the larger the credit.

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We're adding problems all the time. If you want to see a specific problem you can vote for it.

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