- TypeScript – tsconfig, the Flags That Matter
Most of tsconfig you set once. These are the ones that change what compiles: the strict family one flag at a time, target and lib and how they differ, moduleResolution, noEmit, erasableSyntaxOnly, and path aliases. Read off the two real configs in this app — which disagree with each other, correctly.
- NestJS – Authorization and Roles
Role-based access with @Roles and a RolesGuard, and the harder half nobody shows: ownership. Why the role never comes from a request body, why a foreign resource returns 404 rather than 403, and why the route whose rules depend on the row deliberately has no @Roles decorator at all.
- Android – Forms, Text Input and Validation
The keyboard is part of your UI. KeyboardOptions and IME actions, moving focus between fields, input filtering, imePadding so the button is not hidden, error semantics for TalkBack, and a validation model that keeps the rules out of the composable and testable on the JVM.
- iOS – Dependency Injection Without a Framework
A composition root — one initialiser that decides every concrete type the app runs with — instead of singletons scattered through it. Why a static shared is a testing problem before it is a design problem, injecting through the SwiftUI environment, and the constructor parameter that turns an ordering rule into a compiler guarantee.
- Terraform – Interview Questions
The questions Terraform interviews actually ask, answered the way you would say them out loud. What state is for, `count` versus `for_each`, how locking works, module versioning, what happens when someone changes something in the console, Terraform versus CloudFormation versus Ansible, and how you would recover a corrupted state file.