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Product Manager Interviews Module 4

Estimation and product strategy interview questions

Interview questions on estimation and product strategy: warm-ups, then what each harder question tests and how a good answer starts.

25 questions: 4 warm-ups and 21 with model answers · Levels: Fresher to staff

Warm-up questions

Short questions with short answers, each answered in full.

  1. Fresher to mid

    What is the difference between a top-down and a bottom-up estimate, and why do both?

    Answered in the lesson Estimation questions, step by step

  2. Fresher to mid

    What do TAM, SAM and SOM mean, in one sentence each?

    Answered in the lesson Market sizing: TAM, SAM and SOM

  3. Fresher to mid

    What is a moat, and which three kinds can a digital product have?

    Answered in the lesson Answering product strategy questions

  4. Fresher to mid

    What do LTV and CAC mean, and why compare them?

    Answered in the lesson Pricing and monetisation

Questions with model answers

What each question tests, the first step of a good answer and the follow-ups to expect.

  1. Fresher to senior

    Estimate how many parcels from online orders are delivered on a weekday in a city of 2 million people. Say your tree first, then the numbers.

    What it tests
    Clarifying the unit and the scope, building a top-down and a bottom-up tree that share no factor, giving each factor a range, and reconciling the two routes aloud.
    First step
    Pin down the unit first: parcels, not orders, since one order can arrive in several boxes; online shopping only, without meals or groceries delivered within the hour; one working weekday; the whole city. Then say both trees before any number, one from households and one from the riders who deliver.
    Follow-ups

    From the lesson Estimation questions, step by step

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    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 4 minutes

  2. Fresher to mid

    A data set says a state has 90 million mobile subscriptions and 80 million people. How many people there use a mobile phone, and how would you estimate it?

    What it tests
    Reading what an anchor counts, turning a count of connections into a count of people with stated factors, and giving a range with a way to check it.
    First step
    Say first that 90 million subscriptions count connections, not people: 112.5 for every 100 people. Then name what separates the two counts, each as a factor you can estimate: connections used by machines, SIMs that are not in use, people who hold two SIMs, and people who share one phone.
    Follow-ups

    From the lesson Estimation questions, step by step

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  3. Fresher to senior

    Size the market for a simple accounting app for small shops in India. Give TAM, SAM and a defensible SOM for year three.

    What it tests
    Counting in businesses rather than people, narrowing a TAM to a SAM with the product's real limits, and arguing a SOM from sales capacity and churn instead of a share.
    First step
    Clarify the product and the buyer: a shop owner who pays a monthly fee to record sales, stock and dues on a phone. Count shops, not people, then say the trees: shops times the share the app can serve times the price for the SAM, and the shops a sales team can sign each month for the SOM.
    Follow-ups

    From the lesson Market sizing: TAM, SAM and SOM

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  4. Fresher to mid

    Estimate the yearly revenue available to a pet-care home-visit service in India's ten largest cities.

    What it tests
    Starting from households that keep pets rather than from people, separating spending on pets from spending on home visits, and checking a top-down figure with a bottom-up count of supply.
    First step
    Clarify what a visit is, a groomer or a carer at the owner's home, and what revenue means, what owners pay for visits in a year. Then start from households, because pets live in homes: households in the ten cities, the share with a dog or a cat, and the share of those who pay for visits.
    Follow-ups

    From the lesson Market sizing: TAM, SAM and SOM

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  5. Mid to senior

    Your top-down estimate is ten times your bottom-up estimate. How do you work out which one is wrong?

    What it tests
    Treating a large gap as a sign that one factor is wrong, finding that factor instead of averaging the routes, and checking each route's unit, period and buyer.
    First step
    Do not average them: an average of a right number and a wrong one is still wrong, and it hides the factor that failed. Say that a gap this large means one factor is wrong, then check each route's unit, period and buyer, and divide one route's total by the other route's factors to see which assumption it contradicts.
    Follow-ups

    From the lesson Market sizing: TAM, SAM and SOM

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  6. Fresher to senior

    A shopping app expects ten times its normal orders in the first hour of a festival sale. Estimate the peak orders a second and say what you would ask engineering.

    What it tests
    Turning daily volume into a rate a second, separating an hour's average from its peak, and turning the estimate into questions about limits, cost and risk.
    First step
    State the normal volume as an assumption, orders a day, and turn it into an average a second over 86,400 seconds. Then apply the two factors separately: ten times the normal rate for the hour, and a peak factor within the hour, stated as an assumption, because people do not spread their orders evenly over it.
    Follow-ups

    From the lesson Usage, revenue and capacity estimates

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  7. Fresher to mid

    Estimate the storage a photo-sharing feature needs in its first year if 2 million users each upload a few photos a week.

    What it tests
    Turning usage into volume over a period, stating the size of a stored photo with its copies, and giving a range with the factor that moves it most.
    First step
    Clarify what "a few" means as a range, how many of the 2 million users actually upload in a given week, and what is stored for each photo: the original and the smaller copies the app shows. Then multiply users, photos a week, the weeks of a year and the size stored for each photo.
    Follow-ups

    From the lesson Usage, revenue and capacity estimates

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  8. Fresher to senior

    Estimate the yearly revenue of a meditation app with 5 million monthly users. Which assumption matters most, and how would you check it?

    What it tests
    Building revenue from users, the share who pay and the revenue each payer brings, finding the most sensitive assumption and checking it against a public reference.
    First step
    Say the tree: monthly users, times the share who pay, times what a payer brings in a month, times 12. Then give each factor a range and compare their widths: the factor with the widest range relative to its base is the one that matters most.
    Follow-ups

    From the lesson Usage, revenue and capacity estimates

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  9. Mid to staff

    A well-funded rival launches a free version of your paid study app for adults. What do you do in the next 90 days, and why?

    What it tests
    Assessing whether a competitor's move threatens the goal, choosing among ignoring, matching, leapfrogging and differentiating on stated criteria, and planning a test with signals.
    First step
    Ask what the free version includes and whom it is for, then whether it reaches your paying learners. Restate your goal, learners who pay and keep learning, and name your advantage before any option, so each response can be judged against the goal.
    Follow-ups

    From the lesson Answering product strategy questions

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  10. Mid to staff

    Should a mid-sized bank's mobile app add stock investing? Structure your answer and make a recommendation.

    What it tests
    Structuring an expansion decision with the goal, the five forces, the bank's advantage and the options, and recommending with a test while keeping product strategy apart from investment advice.
    First step
    Restate the goal the bank wants from its app, for example customers who keep their main account with it, and ask who would use investing and why they would choose the bank's app. Then name the options before deciding: build, partner with a broker, refer customers out, or not add investing.
    Follow-ups

    From the lesson Answering product strategy questions

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  11. Senior to staff

    Where should a city's bus-ticketing app be in five years? Give the vision, the first bet and how you would know it is working.

    What it tests
    Stating a vision in one sentence, ordering bets so that each builds the next, choosing a cheap first test and setting signals with thresholds in advance.
    First step
    Start from the riders and the city: what a daily bus rider needs, and what the city's transport authority wants from the app. Say the vision in one sentence, then the bets in order, the first chosen as the cheapest test of the vision.
    Follow-ups

    From the lesson Answering product strategy questions

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  12. Mid to staff

    Should a food-delivery app enter towns of 2 to 5 lakh people? How would you decide, and what would you test first?

    What it tests
    Running the four entry questions on a hard market: sizing from local demand, the advantage the app brings, the cheapest way in, and a first test with a stop signal agreed in advance.
    First step
    Clarify the goal first: growth in orders, a defence against a local rival, or profit within a set time. Then size one town before twenty: households that order meals from outside, how often, and the order value against the cost of a delivery in a town where distances are short but orders are few.
    Follow-ups

    From the lesson Entering a market: build, buy or partner

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  13. Mid to senior

    A ride app wants in-app payments. Should it build its own wallet or partner with a payments company? Defend your choice.

    What it tests
    Telling a core capability from a commodity, weighing licences, cost and control, and defending a build-or-partner choice together with what would reverse it.
    First step
    Ask what the payments are for: fewer disputes over cash, faster pay for drivers, or a wallet as a business of its own. Then say what building means here, a regulated payments business with fraud checks and support, before you compare it with a partner's fee on every ride.
    Follow-ups

    From the lesson Entering a market: build, buy or partner

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  14. Senior to staff

    You launched in a new country six months ago. Which signal would make you stop, and why did you choose it before launch?

    What it tests
    Choosing a leading metric tied to the entry's goal, setting its threshold from the business case before launch, and saying what a miss would change.
    First step
    Restate what the entry had to achieve and by when, then name the behaviour that makes it pay, such as repeat use or paid conversion. Say that the signal, its threshold and its date were agreed before launch, so that six months of results cannot be argued into a success.
    Follow-ups

    From the lesson Entering a market: build, buy or partner

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  15. Fresher to senior

    You are launching a paid budgeting app for young salaried adults in India. Who do you target first, through which channel and at what price, and what do you check in the first month?

    What it tests
    Building a go-to-market plan, first customers, channel, price and order of entry, and pairing it with a leading metric that can be read within the first month.
    First step
    Narrow "young salaried adults" to one group you can reach and who feels the problem, such as people in their first job in two cities, paid once a month into a bank account. Then choose one channel that reaches them cheaply, and a price you can test before you defend it.
    Follow-ups

    From the lesson Entering a market: build, buy or partner

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  16. Mid to staff

    A free note-taking app with 10 million users must start earning. Design the paid tier: what is paid, at what price, and what could go wrong?

    What it tests
    Choosing what goes behind payment without breaking the product people use, pricing it against a stated conversion, and naming the risks: lost goodwill, slower growth and unclear labelling.
    First step
    Ask who the 10 million are, how many are active each month and what they use most, and which features cost money to serve, such as storage and sync across devices. Then split the features into what makes people start, which stays as it is, and what heavy users need, which becomes the paid tier.
    Follow-ups

    From the lesson Pricing and monetisation

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  17. Fresher to senior

    Leadership wants to raise the delivery fee by ten rupees. How do you estimate the effect on orders and revenue before deciding?

    What it tests
    Working out the break-even fall in orders, separating the fee's share of the total price from the response to it, and designing a test that measures the response safely.
    First step
    Ask what the fee is today, the average order and what the app earns on an order besides the fee. Then work out how many orders the raise could lose and still earn as much: one minus today's earnings on an order divided by the earnings after the raise.
    Follow-ups

    From the lesson Pricing and monetisation

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  18. Mid to senior

    Price a team chat tool for small businesses, per seat, per use or flat. Make a recommendation with numbers.

    What it tests
    Comparing pricing units against how value and cost grow, working revenue for a stated mix of customers, and protecting both small customers and the margin on heavy users.
    First step
    Clarify who the customers are and how their use differs: firms of 3 to 50 people, messages and file storage per person. Then state a mix of customers with numbers, and work out revenue and margin under each of the three units before recommending one.
    Follow-ups

    From the lesson Pricing and monetisation

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  19. Mid to staff

    Launch a marketplace where home cooks sell meals to office workers. Which side do you start with, where, and which metric tells you it is working?

    What it tests
    Choosing the scarce side to start with, a small area dense enough to work, liquidity targets for both sides, and a metric that shows the market working early.
    First step
    Ask what the product is, such as lunch delivered by a set time, and which side is scarce: cooks who can cook reliably at that scale, or office workers who order often. Then choose one small area, a few office blocks, before you name the side you would recruit first.
    Follow-ups

    From the lesson Platforms, marketplaces and network effects

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  20. Mid to senior

    Buyers and sellers on your services marketplace start exchanging numbers and paying outside the app. What do you do?

    What it tests
    Measuring how many deals leave, finding which jobs leave and why, and answering with value that keeps pairs on the platform rather than with rules alone.
    First step
    Size it first: in which categories, how many repeat pairs stop booking while both stay active with others, and how many messages carry numbers before a booking. Then ask what the platform still gives a pair that has already met, because that, not a rule, is what keeps them.
    Follow-ups

    From the lesson Platforms, marketplaces and network effects

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

  21. Senior to staff

    Your marketplace takes 20 percent of each order and sellers are complaining. How do you decide whether to change it?

    What it tests
    Telling noise from a supply problem, measuring sellers' economics and their leaving, testing a change safely, and weighing the platform's revenue against its liquidity.
    First step
    Check who complains and whether behaviour matches the words: are sellers leaving, listing less, raising prices or moving buyers off the app? Then work out one typical seller's economics at 20 % against their alternatives, before you treat it as a pricing decision.
    Follow-ups

    From the lesson Platforms, marketplaces and network effects

    In the answer:

    • Model answer
    • Follow-up answers
    • Common mistakes
    • Rubric
    • Variants
    • about 3 minutes

All Product Manager Interviews interview questions · The Product Manager Interviews track