Portfolio ↗

Quiz

2827 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 areas2827 Architecture Fundamentals91 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture87 Reliability & Resilience99 Observability92 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture100 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering93 Architecture Patterns84 Architecture Decision-Making101 The Architect's Meta-Skills92 Delivery & Release Engineering103 Platform Engineering & Developer Experience92 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

98 questions in Edge, Mobile & IoT.

  1. Device Telemetry at Scale advanced

    Design telemetry collection where the volume of monitoring data would cost more than the systems being monitored.

    2 min answer telemetrycardinalitysamplingcost
  2. Digital Twin intermediate Multiple choice

    A building-controls platform stores a desired state per device and reconciles it on every connection. An operator sets a fan setpoint that one hardware revision cannot accept, and applies it in bulk to 40,000 units. The platform compares reported state with desired state to decide whether to act. What happens over the next day, and which single change stops it?

    2 min answer digital-twinreconciliationdesired-statewrite-amplification
  3. Digital Twin intermediate Multiple choice

    A field device is offline for hours at a time, and operators change its settings while it is away - sometimes twice. What should the platform store?

    2 min answer digital-twinshadowidempotencyreconciliation
  4. Digital Twin advanced

    A team proposes a digital-twin platform for 20,000 HVAC units: every sensor reading and every attribute change written to an event-sourced graph database with full per-attribute version history, a rules engine evaluating 400 conditions per device per minute, and a 3D visualisation of each site. The goal is "predictive maintenance and remote diagnostics". Review it. What would you remove, what would you change, and what would you leave alone?

    3 min answer digital-twinover-engineeringreviewstate
  5. Digital Twin intermediate

    What problem does a digital twin actually solve, and when is it over-engineering?

    1 min answer digital-twinsimulationstatemodelling
  6. Edge Compute Topologies advanced Multiple choice

    A content and application platform must choose between many small points of presence and fewer larger regional sites. What trades off?

    1 min answer edgetopologycachinglatency
  7. Edge Compute Topologies intermediate

    A content platform must decide what runs at the edge, in a region, and centrally. How should the topology be reasoned about?

    2 min answer sharechattopologyedgeregional
  8. Edge Compute Topologies intermediate Multiple choice

    A ride-hailing platform in the mould of Grab operates in eight cities across four countries. Matching a rider to a driver needs the live positions of nearby drivers and must answer in under 500 ms. Payments, identity and analytics are central. Where should the matching engine run?

    2 min answer grabgeospatialplacementlatency
  9. Edge Compute Topologies advanced

    A team proposes moving an API to edge functions to reduce latency for international users. What do you check before agreeing?

    2 min answer edgelatencyarchitecturedata
  10. Edge Compute Topologies advanced

    A video platform serves a catalogue of 4 million objects where roughly 90% are requested less than once an hour in any one location. The per-location edge cache hit ratio is reported as 93% and origin egress is still the largest line in the infrastructure bill. Akamai documents Tiered Distribution - edge servers fetching from a parent tier near the origin rather than from the origin itself - with a map setting that is explicitly a trade-off. What forced that design and what does a narrower map cost?

    3 min answer akamaicdnorigin-shieldtiered-distribution
  11. Edge Compute Topologies advanced

    Ticketmaster's own November 2022 statement on the Eras Tour onsale says the site drew about 3.5 billion system requests - roughly four times its previous peak - and that for the first time in 400 Verified Fan onsales the bots targeted its Verified Fan access-code servers. An interviewer says: "Design the waiting room for an onsale like that. How much of it runs at the edge?" Walk me through how you would scope and answer that.

    3 min answer ticketmasterqueueingadmission-controledge
  12. Edge Data Consistency advanced

    A mobility platform wants to place data close to users in many regions. Which data can be replicated and which cannot?

    2 min answer olafly-ioedgereplication