In-depth technical articles, high-load system architecture analyses, and practical digital transformation strategies shared directly by Sudo’s engineers and solutions architects.
Many machine learning projects fail not because the algorithm is weak, but because the team picked the wrong problem, trained on unrepresentative data, or measured results with the wrong yardstick. Th...
A typical e-commerce project often has an old payment gateway: a vendor .jar that takes amounts in the smallest currency unit, returns an integer code instead of a typed result, and throws checked exc...
A pure Python for loop over a million elements takes about a hundred milliseconds; the same computation written with NumPy arrays takes under one millisecond. That two-orders-of-magnitude gap is why a...
You have a sample order with the shipping address and product list already configured, and you need thousands of copies with a few fields changed for each customer. Rewriting the whole initialization...
A crawler that finishes without errors does not mean the data is usable, and pandas is the first tool you reach for to fix it. The same product can show up three times under three different URLs; the...
The previous articles made the crawler fast: asyncio opens dozens of connections at once, and Playwright can read pages built with JavaScript. But fast is not the same as good. A crawler that only kno...
An order has an ID, a customer, a list of products, a quantity, an express-delivery flag, a note and several other optional fields. If you write one constructor per combination, the calling code is ha...
You write a crawler with requests and BeautifulSoup, run it, and get back an almost empty HTML page: no products, no prices, just a few script tags. The real content is built later by JavaScript in th...
The line new EmailSender() sits deep inside a business class and looks harmless, until the day a customer asks for SMS, then Zalo, and your test suite can't run without an SMTP server. Factory Method...
The previous article in this series used Scrapy, a framework that ships with its own scheduler and concurrency limits. But many smaller jobs, such as calling a few hundred internal APIs or checking th...
The requests plus BeautifulSoup loop from the previous article on crawling with requests, BeautifulSoup and robots.txt is enough for a few dozen pages. Once you need thousands of pages, you end up wri...
Every enterprise Java codebase has a few objects that "should exist only once": a configuration holder, a connection pool, a product catalog cache, a logger. The Singleton pattern is the classic way t...
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