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2948 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 areas2948 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking96 API & Integration Architecture87 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 Application Decomposition.

  1. Application Decomposition advanced

    A legacy system has no clean boundaries to extract — one shared database, entangled modules, no tests. What is the first move, and in what order should capability be recovered?

    3 min answer legacyseamscharacterisation-testsdecomposition
  2. Application Decomposition advanced

    A platform decomposes a monolith into services. Which boundaries should be extracted first, and which extraction produces a distributed monolith?

    2 min answer decompositionboundariescouplingdistributed-monolith
  3. Application Decomposition advanced

    During a monolith decomposition, the new search service needs data owned by five other services. What do you do?

    2 min answer airbnbdecompositiondata-ownershipcqrs
  4. Application Decomposition advanced

    How would you identify where to split a large application, using evidence rather than opinion?

    2 min answer decompositionchange-correlationseamsdata
  5. Application Decomposition intermediate

    Three services have been extracted from a monolith. All three still read the monolith's database directly, which the team describes as a temporary arrangement. The monolith's next release renames `customers.country` to `customers.country_code` with a compatibility view left behind for itself. What happens, minute by minute, and what mechanism would have stopped it?

    3 min answer shared databasecouplingschema changedistributed monolith