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Designing a Global SMS Gateway: Multi-Carrier Routing Across the World A complete, interview-ready system design walkthrough for building an SMS gateway that reliably delivers text messages to every country, routing intelligently through different telecom carriers and aggregators, at a scale of millions of messages per minute. Introduction & History —…
Designing a Suspicious Transaction Regulatory Reporting System A production-grade, interview-focused deep dive into building a system that continuously watches financial transactions, flags suspicious activity, coordinates human investigation, and files legally binding reports to regulators within hard, unforgiving deadlines — where a missed clock is not a lost feature, it is…
