Complete PM Case Studies with Parvinder Singh

Parvinder Singh

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Complete PM Case Studies

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What you'll get

1 x "Amazon OTT Strategy" - Case Study #03
If you are preparing for APM or PM interviews, this question is a trap. "Should Amazon get into the OTT market?" Amazon… Read more
1 x "Design an app for renting items" - Case Study #12
If you are preparing for APM or PM interviews, this design question is a blank cheque, and that is the trap: "Design an… Read more
1 x "How would you improve Apple Music?" - Case Study #13
If you are preparing for APM or PM interviews, this improvement question has an obvious answer that is wrong: "How would… Read more
1 x "Should YouTube start something like Clubhouse?" - Case Study #14
If you are preparing for APM or PM interviews, this strategy question asks you to copy a product that already failed: "S… Read more
1 x "Estimate the number of footballs that can fit into a shipping container" - Case Study #15
If you are preparing for APM or PM interviews, this guesstimate looks like simple division and hides one insight most ca… Read more
1 x "Mumbai Airport Guesstimate" - Case Study #02
If you are preparing for APM or PM interviews, this post is the entire guesstimate round in one example. "Estimate how m… Read more
1 x "How would you improve Signal?" - Case Study #04
If you are preparing for APM or PM interviews, here is the hardest improvement question I know: "How would you improve S… Read more
1 x "What is your favorite app, and how would you improve it?" - Case Study #05
If you are preparing for APM or PM interviews, the friendliest question in the loop is a trap. "What is your favourite a… Read more
1 x "Should Zomato start its own restaurant?" - Case Study #06
If you are preparing for APM or PM interviews, this strategy question has a hidden trap: "Should Zomato start its own re… Read more
1 x "Estimate the number of refrigerators sold in 2021 in India" - Case Study #07
If you are preparing for APM or PM interviews, this one formula answers half of all guesstimate questions: "Estimate the… Read more
1 x "Diagnose a 30% dip in Avg. Watch Time of Disney+" - Case Study #08
If you are preparing for APM or PM interviews, root cause analysis is the most common case you will face: "Average watch… Read more
1 x "Should Instagram discontinue the Threads app?" - Case Study #25
If you are preparing for APM or PM interviews, this strategy question is about exiting, not entering, and those have a s… Read more
1 x "Design Disney+ for Kids" - Case Study #01
"Design Disney+ for Kids." Variations of this question show up at Google, Meta and every product company. And most candi… Read more
1 x "Diagnose a 20% drop in Cart Additions at Amazon" - Case Study #11
If you are preparing for APM or PM interviews, this RCA question has a twist that most candidates never see: "Cart addit… Read more
1 x "How would you improve Snapchat?" - Case Study #09
If you are preparing for APM or PM interviews, here is the improvement question where the obvious answer is wrong: "How… Read more
1 x "Design an app for artists to sell their art." - Case Study #10
If you are preparing for APM or PM interviews, this design question hides a marketplace trap: "Design an app for artists… Read more
1 x "Diagnose a 40% drop in Ride Bookings at Ola" - Case Study #16
If you are preparing for APM or PM interviews, this RCA question has an answer everyone finds and a second answer almost… Read more
1 x "Design a washing machine for kids" - Case Study #17
If you are preparing for APM or PM interviews, this design question has an ambiguity in its first three words. "Design a… Read more
1 x "Should Microsoft enter the OTT market?" - Case Study #18
If you are preparing for APM or PM interviews, this strategy question is the same one I answered for Amazon, and the ans… Read more
1 x "Estimate the number of reviews written in the Swiggy App in one day" - Case Study #19
If you are preparing for APM or PM interviews, this guesstimate changes by six times depending on one clarifying questio… Read more
1 x "How would you improve YouTube?" - Case Study #20
If you are preparing for APM or PM interviews, this improvement question is about the biggest video platform on earth, a… Read more
1 x "Diagnose a 40% drop in messages sent on WhatsApp" - Case Study #21
If you are preparing for APM or PM interviews, this RCA question hides its answer in the step most candidates skip. "Mes… Read more
1 x "Design a social network for kids" - Case Study #22
If you are preparing for APM or PM interviews, this design question punishes the most natural instinct. "Design a social… Read more
1 x "Should Flipkart sell gold on its platform?" - Case Study #23
If you are preparing for APM or PM interviews, this strategy question hides three different products inside one word. "S… Read more
1 x "Estimate the number of pizzas sold in India in a day" - Case Study #24
If you are preparing for APM or PM interviews, this guesstimate is decided by one honest filter. "How many pizzas are so… Read more
1 x "Diagnose a 35% drop in orders on Blinkit/Zepto" - Case Study #26
"Orders on Blinkit/Zepto dropped 35%. Diagnose it." - If you are preparing for APM or PM interviews, this RCA question h… Read more
1 x "Design Indeed for gig workers" - Case Study #27
"Design Indeed for gig workers." - If you are preparing for APM or PM interviews, this design question tests whether you… Read more
1 x "Why do you think Salesforce bought Slack?" - Case Study #28
"Why do you think Salesforce bought Slack?" - If you are preparing for APM or PM interviews, this strategy question is a… Read more
1 x "Estimate the number of smartphones sold in India in a year" - Case Study #29
"How many smartphones are sold in India in a year?" - If you are preparing for APM or PM interviews, this guesstimate is… Read more
1 x "Improve revenue for Gaana" - Case Study #30
"How would you improve revenue for Gaana?" - If you are preparing for APM or PM interviews, this revenue question punish… Read more
1 x "Diagnose a 50% drop in Outlook usage" - Case Study #31
"Outlook usage dropped 50%. Diagnose it." - If you are preparing for APM or PM interviews, this RCA question needs two c… Read more
1 x "Design an app to help senior citizens book health check-ups" - Case Study #32
"Design an app to help senior citizens book health checkups." - If you are preparing for APM or PM interviews, this desi… Read more
1 x "Should Google enter the OTT market? (like Netflix/Prime)" - Case Study #33
"Should Google enter the OTT market?" - If you are preparing for APM or PM interviews, this is the third time I have ans… Read more
1 x "What is the monthly revenue of a local gym in India?" - Case Study #34
"What is the monthly revenue of a local gym in India?" - If you are preparing for APM or PM interviews, this guesstimate… Read more
1 x "Improve engagement for 1mg" - Case Study #35
"How would you improve engagement for 1mg?" - If you are preparing for APM or PM interviews, this engagement question ha… Read more

About this package

What this is

Between 13 August and 16 September 2026, I posted one solved PM interview case study every single day for 35 days straight. This is all of them, in one download. Completely free.

Not summaries. Not framework cheat sheets. Each one is the full solved answer: the clarifying questions, the segmentation, the assumptions with real numbers, the trade offs, the metrics with guardrails, and the final recommendation, written the way I would answer it in an interview room.

What is inside (35 case studies)

8 Product Strategy - Should Amazon enter OTT, should Zomato open its own restaurants, why Salesforce bought Slack, should Instagram discontinue Threads, should Flipkart sell gold, and more

7 Product Design - Disney+ for Kids, an app for artists to sell their art, a washing machine for kids, Indeed for gig workers, a health checkup app for senior citizens, and more

7 Guesstimates - airplanes taking off from Mumbai airport, refrigerators sold in India, footballs in a shipping container, pizzas sold in India in a day, monthly revenue of a local gym, and more

6 Product Improvement - Signal, Snapchat, Apple Music, YouTube, revenue for Gaana, engagement for 1mg

6 RCA - a 20% drop in Amazon cart additions, 40% drop in Ola ride bookings, 40% drop in WhatsApp messages sent, 35% drop in Blinkit orders, 50% drop in Outlook usage, 30% dip in Disney+ watch time

1 Favourite Product - Google Maps, and how I would improve it

Who this is for

  • APM and PM candidates preparing for interviews
  • Analysts, engineers, designers and consultants switching into product
  • Working PMs who want a structured way to practise case questions
  • Anyone who wants to see one repeatable structure applied 35 times, instead of explained once

How to use it

Read the question first. Give yourself 20 minutes to answer it on paper before you open the solution. The gap between your structure and the one in the PDF is your actual prep plan.

Then go one case type at a time rather than reading all 35 in a single sitting. Depth in one type beats a skim across all five.

Why it is free

This series was built in public, and the feedback from people following along genuinely made it better. This is the thank you. No payment, no email wall, no catch.

If it helps you, pass it to someone else who is preparing.

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