Categories

Jacar categories — explore the topics A rocket whose eyes follow your cursor.
Methodologies

User research in the age of generative AI

Los equipos de producto están tentados de sustituir entrevistas y tests reales por síntesis de IA. Dos años de experiencia ya permiten separar dónde la IA ayuda de verdad y dónde genera una falsa sensación de entender al usuario.

Software Development

Qwik in production: resumable and cheap on the client

Qwik has spent two years promising apps that start instantly because, instead of hydrating, they resume execution serialized on the server. With the 1.x series settled and real cases published, this guide checks whether resumability is worth the learning curve and which products benefit most from that client-side JavaScript saving.

Tools

Figma Dev Mode: From Design to Code with Less Friction

Figma Dev Mode is the developer-facing view inside a Figma file: it generates ready CSS, exposes exact measurements, maps variables to tokens, and, with Code Connect, links each component to the real codebase snippet. It solves most of the design-to-code handoff friction, but it does not replace human judgment on accessibility, performance, or responsive behavior.

Software Development

Astro and Islands: The Web That Sends Less JavaScript

Astro renders static HTML by default and only ships JavaScript for the interactive islands that actually need it. On blogs, docs and content sites, the bundle drops from 100-200 KB to roughly 5-10 KB versus Next.js SSG or Gatsby. It is the wrong choice for SaaS dashboards or apps with state shared across routes.

Software Development

Next.js App Router: Lessons from Migrating Real Projects

App Router went stable in Next.js 13.4 (May 2023), bringing Server Components, layered caching, and Server Actions, but it demands rethinking the application's mental model. Migrating from Pages Router pays off for new projects and read-only routes; for large applications, the realistic path is incremental, route by route, over several months.