I jumped straight into offline mode and cached transaction logs, which felt smart at the time, but I kind of forgot to anchor on the user first.
Start by clarifying the scope and constraints of the ATM system, such as the types of natural disasters, user needs, and regulatory requirements. Then, propose a resilient architecture that includes offline capabilities, redundant connectivity, and alternative power sources. Finally, discuss trade-offs between cost, complexity, and reliability, and how you would prioritize features for an MVP.
Pro tip: Emphasize the importance of designing for graceful degradation rather than perfect uptime—focus on ensuring core cash withdrawal and balance inquiry functions remain available even when the network is down. Also, mention the need for a post-disaster recovery plan and how you would measure success.
Ask questions to understand the scope: which disasters (earthquake, flood, hurricane), expected duration of disruption, regulatory constraints, and user needs (cash withdrawal, deposits, balance inquiry).
Identify the must-have features during a disaster, such as cash withdrawal and balance inquiry, and deprioritize non-essential features like fund transfers or bill payments.
Propose a system with redundant power (solar, battery), multiple network connections (satellite, mesh), and offline transaction capabilities with local storage and synchronization when connectivity is restored.
Discuss how to maintain security in offline mode, such as limiting withdrawal amounts, using biometrics, and implementing tamper-proof logs that sync later.
Weigh cost, complexity, and reliability; define success metrics like uptime during disasters, transaction success rate, and user adoption; and outline a phased rollout plan.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.