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2988 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2988 Architecture Fundamentals91 Distributed Systems111 Data Architecture100 Cloud Architecture97 Networking96 API & Integration Architecture97 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture105 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization102 AI-Era Architecture106 Software Architecture & Engineering93 Architecture Patterns94 Architecture Decision-Making101 The Architect's Meta-Skills102 Delivery & Release Engineering103 Platform Engineering & Developer Experience102 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data103 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

5 questions in Mobile App Architecture.

  1. Mobile App Architecture beginner Multiple choice

    A delivery app marks a parcel delivered. The phone is on a weak connection: the request reaches the server, the response is lost, and the app retries. The customer is charged twice and the parcel is marked delivered twice. Which change fixes this properly?

    2 min answer idempotencyretriesmobileat-least-once
  2. Mobile App Architecture beginner

    A mobile client stamps each event with its own clock and the server stores that timestamp. Why does this break reporting and de-duplication, and what should the server record instead?

    2 min answer clocksevent-timeidempotencyoffline
  3. Mobile App Architecture advanced

    Alibaba reported a peak of 583,000 order-creation requests per second during the 2020 Singles' Day festival on 11 November. Demand of that shape is produced by a countdown every client sees at the same instant. What does scheduled demand change about the mobile client's responsibilities, and where would copying the approach be a mistake?

    3 min answer alibabaflash-salemobileadmission-control
  4. Mobile App Architecture advanced

    Design the mobile architecture for a ride-hailing app used on poor networks, in the background, with continuous location updates.

    2 min answer mobileofflinebatterybackground
  5. Mobile App Architecture advanced

    What changes about API design when your clients cannot be upgraded?

    2 min answer mobileversioningserver-drivenadditive