Interview design problems · source review · September 23, 2026
This source review supports 15 additional interview-practice pages. The source is a live, user-submitted interview-question catalog maintained by Hello Interview. Its entries say which companies users have associated with a prompt, but do not give the interview date for each report. It therefore supports “listed in a current community catalog,” not “asked in the past six months,” a frequency ranking, or a company's official question bank.
The linked problem pages create original practice contracts, assumptions, examples, diagrams, AWS mappings and follow-ups. Their company tags are evidence that candidates have associated a prompt type with those companies; they do not predict an individual interview. Readers should confirm the interview format with their recruiter.
Prompt inventory
| Learning chapter | Practice prompt | Companies shown in the community entry | Source |
|---|---|---|---|
| System design | URL shortener | PayPal, Microsoft, JPMorgan Chase, others | Community listing |
| System design | Ride-sharing dispatch | Google, Salesforce, Visa, Meta, others | Community listing |
| System design | Food delivery marketplace | Uber, Meta, Twilio | Community listing |
| System design | Calendar and free/busy | Microsoft, Oracle, LinkedIn | Community listing |
| System design | Video streaming / YouTube | Datadog, Snapchat, Meta, others | Community listing |
| System design | Personalized news aggregator | Amazon, Microsoft, Rippling, others | Community listing |
| System design | API gateway | MongoDB | Community listing |
| System design | Online coding judge | Meta, Whatnot, Microsoft, others | Community listing |
| Reliability | Distributed job scheduler | Robinhood, DoorDash, NVIDIA, Airbnb, others | Community listing |
| Observability | Metrics monitoring and alerting | Meta, LinkedIn, Stripe, MongoDB, others | Community listing |
| Data at scale | Web crawler | ZoomInfo, Atlassian, Microsoft, Expedia, others | Community listing |
| Data at scale | Typeahead search | Databricks, Meta, Expedia, Salesforce, others | Community listing |
| Data at scale | Distributed cache | Google, Microsoft, Meta, Amazon, others | Community listing |
| Data at scale | Distributed key-value store | LinkedIn, Databricks, Geico, Microsoft, others | Community listing |
| Data at scale | Ad-click aggregator | Meta, Rippling, Google, Amazon, others | Community listing |
Why the practice set is broader than the reported prompts
The problems were selected to cover distinct interview design skills: product workflows and state ownership; high-write data systems; distributed coordination; observability/cardinality; isolation of untrusted work; and AWS service selection. This is a breadth choice, not a claim that these 15 are the most frequently asked prompts. The prior 21 practice pages remain in the same learning sequence.
Research limitation: Catalog entries were reviewed on the date above, but a current page or recently crawled result does not date the interview anecdote. We found no reliable public source exposing recent report dates across this full list. Any claim that all 15 were asked within the last 6 or 12 months would exceed the evidence.