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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 Cost per Request.

  1. Cost per Request intermediate

    A communications platform of the kind Twilio operates bills its customers per message. Most of what it pays per message goes to carriers rather than to its own servers. The team commits to halving infrastructure cost per message this year. What does that buy, and what does it give up?

    3 min answer unit economicscost of goods soldroutingmargin
  2. Cost per Request intermediate Multiple choice

    A marketplace's infrastructure spend rises with growth. How should it distinguish healthy growth from deteriorating efficiency?

    2 min answer meeshounit-economicscostefficiency
  3. Cost per Request advanced

    An inference platform's cost per request varies by two orders of magnitude between requests. What does that imply for pricing, capacity and engineering priorities?

    2 min answer cost-per-requestvariancepricingbatching
  4. Cost per Request advanced

    How do you build a cost-per-request model for a proposed architecture before writing code, and which cost terms are most often omitted?

    2 min answer prime-videocost-modellingunit-economicsdesign-review
  5. Cost per Request intermediate Multiple choice

    Your infrastructure bill rose 40% this quarter. What do you need to know before deciding whether that is a problem?

    2 min answer unit-economicscostefficiencymetrics