(Notes · 3)

Notes

Short, practical guides from real projects — the things I had to learn the hard way, written down so you don't have to.

  1. How to read a Bangladesh bank routing number

    What each of the 9 digits in a Bangladesh BEFTN routing number means, how to check one before you pay a salary, and the mistakes that send money to the wrong bank.

    5 min read

  2. SSLCommerz payments for a multi-hotel booking platform

    How SSLCommerz checkout works, plus three lessons from a seven-hotel booking platform: one merchant account per hotel, and reserve only after payment.

    5 min read

  3. How an AI chatbot answers from your own documents

    How a support chatbot answers from your own documents (RAG), and six things that decide if it helps customers or guesses — from two chatbots I built.

    5 min read

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