Categories

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

XR, AR and VR in 2026: the honest state after the cycle

After the 2023-2024 hype cycle led by Apple Vision Pro, the 2025 valley of disillusionment, and the quiet but real consolidation of Meta Quest 3S and the WebXR stack, it is time to assess honestly where extended reality stands. What works, what has died, what is still alive.

Software Development

WASI preview 3: adoption and real cases

WASI preview 3 llegó como estándar estable a finales de 2025 y ha tenido unos meses para demostrar si realmente desbloquea los casos que preview 2 se quedaba cortos. Recorrido honesto por adopciones reales, bibliotecas maduras y patrones que empiezan a funcionar en producción.

Artificial Intelligence

UX for agents: first design consensus

After two years watching every product invent its own interface for talking to an agent, by January 2026 a stable design consensus is emerging about which patterns work, which do not, and what the average user already expects. Time to write down what has settled.

User Experience

European Accessibility Act: the first year in practice

La obligación del EAA entró en vigor el 28 de junio de 2025. Seis meses después tenemos ya primeros expedientes sancionadores, criterios de enforcement y lecciones operativas para equipos que aún corren detrás del calendario. Lo que sí se audita y lo que todavía no.

Architecture

gVisor: sandboxing for multi-tenant containers

gVisor interpone un kernel en espacio de usuario entre el contenedor y el anfitrión. Después de años en producción en Google y adopción creciente en plataformas serverless, merece una lectura honesta sobre cuándo compensa frente a microVMs y runtimes clásicos.

User Experience

Accessibility overlays: the 2025 criticisms explained

Accessibility overlays were sold as a magic fix for WCAG and the European EAA directive in one step. In 2025 lawsuits against them have grown and disabled users are speaking out more critically than ever. A look at why they fail and what to do instead.

Architecture

Delta Lake and Apache Iceberg: 2025 comparison

Open table formats over data lakes have moved from curiosity to backbone of many analytics architectures. Delta Lake 4.0 and Apache Iceberg 1.9 are the two with the most weight in 2025. We review where each one stands and which criteria make sense when choosing between them.

Software Development

Rust Edition 2024: what really changes day to day

Rust Edition 2024 became stable on February 20, 2025 alongside Rust 1.85. Seven weeks later, the changes that actually matter for daily work are three: more granular variable capture in closures and Return Position Impl Trait, an expanded prelude with Future and AsyncFn, and unsafe now mandatory in extern blocks.

Architecture

Applying graph RAG to a real product

Desde que Microsoft abrió GraphRAG, el patrón de usar grafos sobre tus propios datos ha pasado de experimento académico a técnica con aplicaciones prácticas. Reflexión sobre cuándo compensa, cómo se monta y qué errores se repiten.

Architecture

Model Context Protocol: Anthropic’s Open Proposal

Model Context Protocol (MCP) is the open standard Anthropic published on 25 November 2024 to connect language models with external data and tools over JSON-RPC 2.0. It does not replace function calling: it standardises the server side, aiming to become for context what the Language Server Protocol is for code editors.

Software Development

SvelteKit 1.0 a Year Later: Real Adoption and Limits

Almost two years after 1.0, SvelteKit works in production: 30-50% lighter bundles than React, file-based routing, and no-lock-in deployment. It wins for small teams with stack freedom; it loses to Next.js when a team has heavy existing React investment or needs to hire fast.

Architecture

How to Install PostgreSQL with pgvector Step by Step

This guide installs PostgreSQL 16 with pgvector on Debian or Ubuntu using the official PGDG repository, creates a dedicated role and database, tunes memory for production, and explains when the HNSW index beats IVFFlat depending on vector volume and the available maintenance window.