I'm Jairo Fernandez, Colombian 🇨🇴 Fullstack Developer at Konstruct. I mostly work with Node.js + Kubernetes and I love building tools that delete developer pain (and a little chaos) from daily workflows.

Want to connect? Find me on Dev.to, Twitter/X, or LinkedIn.

Here are my favorite builds 👇

Projects I use often, built to make developer life easier and more fun.

A fresh alternative to Insomnia, Postman and friends. Fast, focused, and built for people who just want to hit endpoints and move on.

• ⚡ What it does: API testing with a lightweight, no-nonsense workflow
• 🧠 Why I built it: I wanted less setup, less noise, and more shipping
• 📰 Read more: Knock: A new alternative to Insomnia, Postman and more

The peace treaty for npm vs yarn vs pnpm drama. Let your team use their favorite package manager while keeping projects consistent. Features transparent aliases, unified lock files, and zero learning curve.

• 📦 What it does: Allows teams to use different package managers (npm, yarn, pnpm, bun) while maintaining consistency
• 🎯 Why I built it: Tired of package manager conflicts and lock file drama in team projects
• ⚡ Daily use: Every project setup and dependency management
• 🔗 Documentation | GitHub

Rapid CLI development tool that actually works. Skip the boilerplate and focus on your CLI logic with built-in argument parsing, help generation, and modern tooling support.

• 🛠️ What it does: Streamlines CLI application development with templates and utilities
• 🎯 Why I built it: Creating CLIs shouldn't be harder than the problem they solve
• ⚡ Daily use: Prototyping tools and automating repetitive tasks
• 🔗 NPM Package | GitHub

A VS Code extension that trains muscle memory, not copy-paste reflexes. It measures your real typing speed and accuracy while you solve interview problems, blocks paste entirely, generates fresh exercises with a local AI model, and targets your weakest topics automatically.

• ⌨️ What it does: Enforces real typing practice through guided modes (Typing, Assisted, TDD, Blind), an AI coach, and an MCP interface for agents
• 🧠 Why I built it: Pasting solutions teaches nothing — you need the physical memory of writing code under pressure
• 🔗 GitHub

The fastest way to scaffold a VS Code extension with React UI. Zero-config build, a typed RPC bridge between extension and webview, and a CLI that gets you from zero to running in one command.

• 🛠️ What it does: Scaffolds VS Code extensions with React + typed RPC, handling all the boilerplate so you focus on your feature
• 🎯 Why I built it: The official extension API is powerful but verbose — vsceasy removes the ceremony
• 🔗 Documentation | GitHub

(Some content might be written in Spanish)

• AI fatigue? (published on July 01, 2026)
• Build VS Code Extensions Fast with vsceasy (published on June 14, 2026)
• Knock a new alternative to Insomnia, postman and more... (published on May 18, 2026)
• 🚀 FNPM Just Became Invisible (In the Good Way): Transparent Alias, Better Tests & a Smoother Experience (published on November 14, 2025)
• FNPM: The Package Manager Drama Ends Here 🚀 (published on February 13, 2025)
• The sad story of node update! (published on August 14, 2024)
• Docker is destroying my machine! 💥 (published on July 26, 2024)
• CLI Maker: More Than We See (published on July 24, 2024)
• Create a simple CLI, a mess (published on July 20, 2024)
• Has tu README realmente útil (published on May 30, 2024)

... And several additional articles are available on my blog. Check it out!

I work in the open: these are all the Pull Requests I've opened or contributed to recently, only public repositories are visible.

PR Title	Repository	Changes	Status
#11: fix(terminal): shell menu flip when maximized + per-distro WSL entries	knock		merged
#10: fix(ui): native webview zoom + cleaner terminal tab bar	knock		merged
#9: fix(terminal): Windows terminals froze the app — downgrade portable-pty, async PTY commands	knock		merged
#8: ci: restore aarch64 DMG bundling with XProtect workaround	knock		merged
#3: Add code-coach and vsceasy to profile's "Tools I Use Daily" section	jairoFernandez		merged
#679: ✨ feat: add Sidebar collapse trigger and logo visibility options	konstruct-ui		merged
#7: Release CI: bypass failing DMG bundling for macOS aarch64 Tauri build	knock		merged
#6: ci: run tests on windows-latest	knock		merged
#656: 🐛 fix: prevent actions menu closing on diagonal hover	konstruct-ui		merged
#651: ✨ feat: add optional back button and step icons to Breadcrumb	konstruct-ui		merged

Overall, my most recent contributions (besides my own repos) have gone to @algolia, @CodelyTV, @ClientCall, @api-platform and @microsoft.

Repositories I've starred recently because they were interesting, cool, or useful.

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