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.
Knock - API Testing Without the Bloat
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
FNPM - End the Package Manager Wars
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
CLI Maker - Build CLIs Without the Mess
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
(Some content might be written in Spanish)
- 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.
Overall, my most recent contributions (besides my own repos) have gone to @OnWatchUS, @ClientCall, @dagrinchi, @ideascoldigital and @kubefirst.
Repositories I've starred recently because they were interesting, cool, or useful.
| Repository | Stars | Repository | Stars |
|---|---|---|---|
| ideascoldigital/cli-maker | 5 ⭐ | msitarzewski/agency-agents | 121.6K ⭐ |
| douglasmakey/poc-rust-https-sn... | 17 ⭐ | Panniantong/Agent-Reach | 47.6K ⭐ |
| douglasmakey/send-file-over-tc... | 14 ⭐ | homanp/infinite-monitor | 712 ⭐ |
| douglasmakey/ebpf-learning | 16 ⭐ | nicedreamzapp/claude-code-loca... | 2.9K ⭐ |
| douglasmakey/admissioncontroll... | 29 ⭐ | MemPalace/mempalace | 56.8K ⭐ |
| douglasmakey/isoserver | 10 ⭐ | microsoft/mcp-for-beginners | 16.6K ⭐ |
| midudev/github-sentinel | 68 ⭐ | opensandbox-group/OpenSandbox | 11.8K ⭐ |
| rohitg00/ai-engineering-from-s... | 37K ⭐ | jdsoteldo/architectural-patter... | 1 ⭐ |
| codecrafters-io/build-your-own... | 521.3K ⭐ | koala73/worldmonitor | 61.1K ⭐ |
| un/inbox | 1.7K ⭐ | sipeed/picoclaw | 29.5K ⭐ |
Last updated: July 01, 2026 at 05:15:56 EDT. The content here updates twice daily or when manually triggered.
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