Technical content for developers and testers working with Brazilian documents and data.
Using real CPF, CNPJ, or credit card data in development and staging environments is a legal and ethical risk. Understand how mathematically valid fic...
Brazil's Lei Geral de Proteção de Dados (Law 13.709/2018) places clear obligations on those who develop systems that collect, store, or process person...
CPF and CNPJ are not random number sequences — they contain check digits calculated by a mathematical algorithm based on modulus 11. Understanding thi...
Testing systems that accept Brazilian documents requires attention to algorithmic rules, edge cases, and legal compliance. This guide brings together ...
Brazil has a complex system of identification documents, each with a distinct structure and purpose. This guide presents the main documents, how they ...
API testing is fundamental in modern software development. Using valid fictitious data, such as algorithmically generated CPFs and CNPJs, ensures your...
QA automation depends on reliable and diverse data to validate all scenarios of an application. In this article, we explore how fictitious data genera...
Data masking is an essential technique for protecting sensitive information in development and testing environments. With LGPD in effect, understandin...
In a developer's daily routine, quick calculations are more common than you might think. Unit conversions, percentage calculations, time estimates — i...
Measuring time is a constant need in a developer's daily routine. Whether timing test durations, managing focus intervals with techniques like Pomodor...