Portfolio ↗

Quiz

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

5 questions in Data Platform Tenancy.

  1. Data Platform Tenancy advanced

    A data platform serves many internal teams with very different data volumes and sensitivity. How should tenancy be structured?

    2 min answer data-tenancyisolationaccess-controlcost
  2. Data Platform Tenancy advanced

    A departing tenant's contract requires deletion within 30 days. Their rows sit in a shared 40 TB events table in an open table format - partitioned by event_date with tenant_id as one column of 60, snapshot retention 90 days, compaction weekly. An engineer runs a DELETE for that tenant_id. What happens next, and what is the 30-day clock actually measuring?

    3 min answer datadogtenancydeletionretention
  3. Data Platform Tenancy advanced

    A product-analytics platform serves many customers' data on shared infrastructure. What isolation is required at the storage and query layers?

    2 min answer posthogtenancyisolationquotas
  4. Data Platform Tenancy advanced

    Pinterest described in 2015 how every object it stores carries a 64-bit identifier with the shard number packed into the high bits, so any object routes to its database without a lookup. Your analytics platform holds 40 TB of event tables for 900 internal tenants keyed by a random UUID, and an engineer proposes adopting the same trick for the warehouse. What does packing the tenant into the key actually buy on the analytical side, and where would copying Pinterest be a mistake?

    3 min answer pinteresttenancykey designpartitioning
  5. Data Platform Tenancy advanced

    Your multi-tenant analytics platform stores all tenants in shared tables with a `tenant_id` column. What is the risk and how do you close it?

    2 min answer tenancysecurityisolation