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2908 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 areas2908 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture87 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture95 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization92 AI-Era Architecture96 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

6 questions in Estimation.

  1. Estimation intermediate

    An architect is asked how long a migration will take and has genuinely no basis for a number. How should estimation be approached so the answer is useful rather than either false precision or a refusal?

    2 min answer estimationuncertaintyrangesdecomposition
  2. Estimation intermediate

    An architect is asked how long a migration will take and has genuinely no idea. What is the responsible answer?

    2 min answer growwestimationuncertaintyranges
  3. Estimation intermediate

    An architect must estimate a large piece of work with genuine uncertainty. What makes an estimate useful rather than misleading?

    2 min answer estimationrangesassumptionsuncertainty
  4. Estimation beginner

    Every one of 180 services must move to a new authentication library. The platform team migrated three sample services and each took about two days. A director asks for the total. Roughly what is it, and which assumption decides the answer?

    3 min answer estimationmigrationlong tailbeginner
  5. Estimation intermediate

    You are asked how long a migration will take. You genuinely do not know within a factor of three. What do you say?

    2 min answer estimationcommunicationuncertainty
  6. Estimation advanced Multiple choice

    Your capacity plan sizes the platform at twice last year's peak. Ticketmaster's November 2022 Eras Tour onsale took 3.5 billion system requests - four times its previous peak - after inviting 1.5 million verified fans. Which assumption inside a peak-multiple estimate fails first?

    3 min answer ticketmastercapacity-planningestimationpeak-load