Principal Software Engineer based in Spain 🇪🇸 — building software products, tools, and open-source. Self-taught developer with a strong product mindset and a passion for scalable systems, performance, and developer experience.
- Twitter → @alexvcasillas
- LinkedIn → Alex Casillas
- Personal Website → alexvcasillas.com
- JavaScript Cooking Book → javascriptcookingbook.com
I have a 😸 cat —a Bombay called Sirius (2). He supervises most of my coding sessions.
I’m a core contributor at Tiptap, one of the most popular open-source rich-text editor frameworks used by thousands of developers and companies worldwide.
Tiptap powers modern text editing experiences across SaaS products, documentation tools, and collaborative platforms. My work focuses on editor architecture, extensions, performance improvements, and developer experience.
A privacy-first, cookie-less web analytics platform built as a lightweight alternative to Google Analytics.
Pulsora focuses on:
- Anonymous traffic tracking
- GDPR-friendly data collection
- No cookies or invasive fingerprinting
- Simple dashboards and actionable insights
- Fast, minimal scripts for modern websites
Designed for founders, indie hackers, and product teams who want useful analytics without sacrificing user privacy.
A modern CLI tool for managing and running HTTP requests using YAML configuration files.
curl-runner makes API workflows reproducible and automation-friendly:
- Define requests declaratively
- Run collections of endpoints easily
- Ideal for API testing, scripting, and CI pipelines
- Built on Bun for speed and performance
Perfect replacement for scattered curl commands and ad-hoc scripts.
📦 Cratebox.io — Open Source
A fast global CDN for NPM registry assets.
Cratebox allows you to instantly retrieve any public package file using a simple URL pattern:
cratebox.io/:package@:version/:file
Optimized for performance, caching, and developer convenience.
A complete hands-on course covering:
- Application architecture
- Centralized state management
- Async actions and snapshots
- Performance optimization with observers
- Production-ready React patterns
Focused on building scalable React apps with clean state design.
A practical guide to building server-side applications and CLI tools with Node.js — from fundamentals to real-world use cases.
A beginner-friendly introduction to JavaScript fundamentals, syntax, and core programming concepts.
- 📥 Digital → https://alexcasillas.gumroad.com/l/javascript-cooking-book
- 📗 Print → https://www.amazon.com/Alex-Casillas/dp/B0BW2GGHHT
Thanks for stopping by — let’s build great software 🚀