Portfolio ↗

Quiz

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

2948 questions.

  1. Network Troubleshooting advanced

    A developer platform receives reports that clones are slow "sometimes, from some places". Server metrics are healthy, error rates are normal, and the team cannot reproduce it. How do you investigate a problem that is invisible from the server side?

    3 min answer troubleshootingclient-side-measurementpacket-lossmtu
  2. Network Troubleshooting advanced

    A user reports intermittent TLS errors from one region only. Walk through your diagnosis.

    2 min answer tlsdiagnosisnetworking
  3. Network Troubleshooting advanced

    After moving a service behind a VPN to an on-premises system, small API calls succeed and large responses hang indefinitely. Walk through the diagnosis.

    2 min answer mtuvpnicmptroubleshooting
  4. Networking advanced

    A mobility platform operates across several Southeast Asian markets where mobile networks vary enormously in quality, latency and reliability. Which network-layer decisions matter most, and which common assumption breaks first?

    2 min answer mobile-networkslatencyresiliencegrab
  5. Networking intermediate

    A user in Mumbai types your URL and presses enter. Walk me through every hop until the HTML reaches their browser. Where would you look first if the page were slow?

    2 min answer networkingdnstlscdn
  6. Networking advanced

    An interviewer says - we run in one region and we are adding a second for a video platform at Twitch scale. Which networking decisions do you want settled before any code is written, and which can wait?

    3 min answer interviewmulti-regionaddressingfailover
  7. Networking intermediate

    Design the network layout for a three-tier application in one cloud region. What are the decisions you cannot easily change later?

    2 min answer vpcsubnetssegmentationcloud
  8. Networking advanced

    In the October 2021 Meta outage, engineers reportedly struggled to physically access equipment because the access-control systems were also down. What class of dependency is that, and how do you find yours?

    2 min answer bgpdnsdependenciesout-of-band
  9. Non-Functional Test Strategy beginner

    A requirements document says "the system must be highly available and performant". How do you turn that into something testable?

    2 min answer nfrrequirementstesting
  10. Non-Functional Test Strategy advanced

    A trading platform's functional tests all pass and production fails under load. What should the non-functional test strategy contain?

    2 min answer zerodhaload-testingnfrsoak
  11. Non-Functional Test Strategy advanced

    ByteDance's Monolith paper (RecSys 2022) describes a recommendation system with minute-level parameter synchronisation whose training parameter servers are snapshotted only once a day, so a server failure loses up to a day of updates. The authors say they expected to need more frequent snapshots. What did they do instead of arguing about it, and what does that give a non-functional test strategy?

    3 min answer bytedancemonolithrecovery-objectivenfr
  12. Non-Functional Test Strategy advanced

    On 31 January 2017 a GitLab engineer removed the wrong PostgreSQL data directory, and the recovery mechanisms they believed they had turned out not to work. Roughly six hours of data was lost. Which property had never been tested, and what does that say about non-functional testing generally?

    2 min answer gitlabbackupsrestore-drilldr