“Hello Interview was an amazing resource for me. I basically took the months of March and April to read through all the material like I was in a college course, and I actually had a fun time learning so much.”

“Landed ~$1M TC offer from Stripe... Multiple rounds of system design questions similar to the ones on Hello Interview.”

“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+.”

“By the time I reached Rippling, I had already passed five system design rounds in a row — all firsts for me. That streak simply wouldn't have happened without the structured foundation Hello Interview gave me. The founders clearly know how to teach, not just perform.”

Rippling

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“Hello Interview plays a pivotal role in preparing for this round. Similar question was in 'Peer system design Library' on HelloInterview hence I was able to save time to optimise and answer multiple follow up questions.”

“Use Hello Interview. I can't emphasize enough how helpful their delivery framework and deep-dive videos were.”

“I started with Hello Interview and went through all their system design articles... The practice tasks on Hello Interview were honestly the most useful part for me.”

“The real game-changer for my System Design prep was Hello Interview... I picked up [Premium], and it was the best investment I made.”

Google

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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.”

“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.”

Toast

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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.”

“I decided to start utilizing the guided practice + tutor feature to really go in depth into some of the system design questions... Overall I relied heavily on HelloInterview to help me learn system design almost from scratch.”

“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 missingout.”

“The deep dives helped me build the right thought process, improve my design fundamentals, and, most importantly, learn how to communicate my ideas effectively during interviews... I can honestly say that I relied heavily on Hello Interview for System Design preparation.”

Amazon

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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.”