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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

6 questions in Domain Boundaries.

  1. Domain Boundaries advanced

    A B2B commerce and financing business is deciding where to draw the boundary between its commerce and credit domains. What should determine it?

    2 min answer ofbusinessdomainsboundariescredit
  2. Domain Boundaries advanced

    A grocery-delivery business handling about 220000 orders a day in one country must begin operating a second market as a separate legal entity with its own tax registration and courier contracts, under a rule that the new market's customer data may not leave that market. Today one order service owns the basket, the courier job, the payout and the invoice for everything, with 18 months of history in one Postgres cluster. Sequence the split with no customer-visible downtime, say where data can diverge and name the point of no return.

    2 min answer bounded-contextdata-residencylegal-entitymigration
  3. Domain Boundaries advanced

    A marketplace is deciding whether "listing" and "inventory" are one domain or two. How should the boundary be decided, and what evidence settles it?

    2 min answer domain-boundariesbounded-contextlanguageownership
  4. Domain Boundaries advanced

    The word "customer" means different things in sales, fulfilment and finance. How does that affect your service design?

    2 min answer dddbounded-contextcanonical-modelubiquitous-language
  5. Domain Boundaries advanced

    Twilio announced the acquisition of Segment in October 2020 for about $3.2 billion in stock and closed it in November 2020, adding a customer-data platform alongside its messaging and voice APIs. Buying a product in an adjacent domain buys that domain's boundary along with its code. What does the acquirer gain, what does it pay, and when does that bill arrive?

    3 min answer twiliosegmentacquisitionbounded-context
  6. Domain Boundaries advanced

    Walk me through how you would choose the first capability to extract from a fifteen-year-old monolith, given that leadership expects visible progress within two quarters.

    3 min answer monolithextractionboundariessequencing