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2707 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 areas2707 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

19 questions in Edge, Mobile & IoT.

  1. Constrained Protocols intermediate Multiple choice

    A battery-powered sensor on a cellular network holds an MQTT session. After quiet periods the server's messages stop arriving, though the device's socket is still open and sending works. Which change fixes it at the lowest energy cost?

    2 min answer mqttnatkeepalivebattery
  2. Constrained Protocols intermediate

    A soil-moisture sensor runs on two AA cells, about 2,000 mAh usable. It wakes every 15 minutes, sends roughly 60 bytes, and sleeps. Sleep draw is about 10 uA. Each transmission cycle takes roughly 2 seconds at an average 30 mA while the radio is active. Estimate the battery life, and say which assumption you would attack first.

    3 min answer batteryduty-cycleenergyiot
  3. Constrained Protocols intermediate

    Devices are battery-powered with intermittent low-bandwidth connectivity. What protocol properties matter, and what is usually chosen wrongly?

    1 min answer protocolsmqttcoappower
  4. Device Identity intermediate

    Review this design. A delivery-partner app on low-end Android phones reads a device identifier from the operating system at launch and uses it as the primary key of a devices table. The row holds the partner's current shift, an offline cash ledger and a per-device fraud limit. The identifier is Android SSAID or iOS identifierForVendor depending on platform. What would you remove, what would you change, and what would you leave alone?

    3 min answer device-identityandroidiosfraud
  5. Device Provisioning intermediate

    A consumer device sells 600,000 units in the fourth quarter and most of them are gifts. Roughly how many first-boot provisioning requests per second should the platform be sized for on the morning of 25 December, and what does the number rule out?

    3 min answer provisioningcapacitycertificatesactivation
  6. Device Provisioning intermediate

    Devices are provisioned on a contract manufacturer's line: each unit boots, calls your cloud provisioning service, receives a unique certificate, and is boxed. At 02:00 on a Saturday your provisioning service becomes unreachable from that factory. The line runs three shifts and cannot stop. What happens next, and what should the design have been?

    3 min answer provisioningmanufacturingavailabilitycertificates
  7. 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
  8. 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
  9. Digital Twin intermediate

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

    1 min answer digital-twinsimulationstatemodelling
  10. 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
  11. 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
  12. Edge Functions intermediate

    A team wants to move logic to edge functions. What are the genuine constraints, and which logic should stay at the origin?

    2 min answer verceledgeconstraintsstate