https://nobeldahal.com.np/writingCase studies and notes from building business software.enhttps://nobeldahal.com.np/writing/what-one-record-taught-mehttps://nobeldahal.com.np/writing/what-one-record-taught-meFri, 30 Oct 2026 00:00:00 GMTAir cargo is moving from messages to linked data. Lessons from serving ONE Record from a real cargo system, beyond what the spec tells you.https://nobeldahal.com.np/writing/handing-out-air-waybill-numbershttps://nobeldahal.com.np/writing/handing-out-air-waybill-numbersThu, 29 Oct 2026 00:00:00 GMTAn air waybill number is a scarce, audited resource that two people will try to take at the same second. Check digits, stock states, and the locks that keep it honest.https://nobeldahal.com.np/writing/mtls-and-oauth2-togetherhttps://nobeldahal.com.np/writing/mtls-and-oauth2-togetherMon, 05 Oct 2026 00:00:00 GMTSome partner APIs want a client certificate on the connection and a bearer token on the request. Every way that goes wrong, in the order it went wrong for me.https://nobeldahal.com.np/writing/most-waybills-are-the-usual-onehttps://nobeldahal.com.np/writing/most-waybills-are-the-usual-oneSat, 03 Oct 2026 00:00:00 GMT3,142 air waybills used just 149 routings, and five of them covered 87%. How that one number turned a data-entry form into a learning engine, without a model.https://nobeldahal.com.np/writing/designing-a-rate-enginehttps://nobeldahal.com.np/writing/designing-a-rate-engineThu, 02 Jul 2026 00:00:00 GMTAir, sea, road and rail price freight in different units by different rules. How I built one engine for all four, and the rules that kept it correct.https://nobeldahal.com.np/writing/maintaining-phpjasperhttps://nobeldahal.com.np/writing/maintaining-phpjasperFri, 16 Jan 2026 00:00:00 GMTKaede prints air waybills, invoices and payslips through JasperReports. The PHP wrapper everyone uses had gone quiet, so I forked it and fixed what production kept finding.https://nobeldahal.com.np/writing/teaching-a-ui-library-nepalihttps://nobeldahal.com.np/writing/teaching-a-ui-library-nepaliTue, 09 Jan 2024 00:00:00 GMTI translated Syncfusion's Essential JS 2, 64 components and over four thousand strings, into Nepali. These are the choices that made it read like Nepali and not like a dictionary.https://nobeldahal.com.np/writing/esewa-khalti-laravelhttps://nobeldahal.com.np/writing/esewa-khalti-laravelFri, 16 Dec 2022 00:00:00 GMTMost eSewa and Khalti tutorials stop when the success page loads. That's exactly where the fraud starts. A production pattern from a government payment page, for any Laravel app in Nepal.https://nobeldahal.com.np/writing/taking-money-on-a-government-websitehttps://nobeldahal.com.np/writing/taking-money-on-a-government-websiteWed, 14 Dec 2022 00:00:00 GMTHow Kalimati's traders came to pay their dues from their phones through eSewa and Khalti, and the checks that keep a public payment page honest.https://nobeldahal.com.np/writing/one-developer-one-markethttps://nobeldahal.com.np/writing/one-developer-one-marketTue, 19 Jul 2022 00:00:00 GMTBuilding the website and Android app for Kalimati, the market that sets vegetable prices for half of Kathmandu, on my own.https://nobeldahal.com.np/writing/a-date-that-did-not-fithttps://nobeldahal.com.np/writing/a-date-that-did-not-fitMon, 31 Jan 2022 00:00:00 GMTThe year 4123 crashed Laravel's date validation on 32-bit PHP. Here's how I found it, and the four-line fix that shipped in Laravel 8.https://nobeldahal.com.np/writing/finding-the-nearest-agenthttps://nobeldahal.com.np/writing/finding-the-nearest-agentTue, 25 May 2021 00:00:00 GMTA US brokerage moved from Zoho to Microsoft Dynamics. The data moved fine; the question it couldn't answer quickly was "who is closest to this lead?"https://nobeldahal.com.np/writing/the-check-that-only-lived-in-the-browserhttps://nobeldahal.com.np/writing/the-check-that-only-lived-in-the-browserFri, 01 May 2020 00:00:00 GMTHow an email field in Everest Forms trusted the browser, how I closed it, and the regression I shipped and fixed along the way.