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@FernandoCelmer

Fernando Celmer

FernandoCelmer
Florianópolis, Brazil

Hey, I'm Fernando

Senior Software Engineer at Mercado Libre, based in Florianópolis, Brazil. I've been building and
maintaining open-source projects since 2018 — tools that I needed and didn't exist, so I made them.

Projects I maintain


Owline A social network where playlists are posts. Users curate playlists, publish them, and engage through loves, saves, comments, and forks. Built from scratch — React web app, Expo mobile app (iOS + Android), and a FastAPI backend running on AWS Lambda. Automatic scrobbling detects what you're listening to from any music player.

🌐 owline.io · GitHub
LinuxProfile CLI tool for managing Linux user profiles. Switch between terminal configurations, dotfiles, themes, and package lists with one command. Designed for developers who work across multiple machines or want reproducible setups. Plugin system for extensibility.

GitHub
Dotflow Lightweight Python library for building execution pipelines. Define workflows as chains of steps with retry, parallel execution, cron scheduling, and async support. No heavy dependencies — just connect functions and let them flow.

PyPI · GitHub
Mkdocs Simple Blog Blog template for MkDocs — clean, minimal, no bloat. Used by 120+ developers and forked 13 times. Just write markdown, get a blog.

GitHub

Why sponsor?

These projects are maintained in my free time, outside of my day job. Your sponsorship helps me:

  • Fix bugs faster — respond to issues and ship patches
  • Ship new features — especially Owline, which is a full product being built in the open
  • Keep packages updated — dependency updates, security patches, Python version support
  • Write better docs — tutorials, examples, and guides

Thank you

1 sponsor has funded FernandoCelmer’s work.

Private Sponsor

Featured work

  1. FernandoCelmer/mkdocs-simple-blog

    Blog Template for Mkdocs

    HTML 129
  2. dracula/mkdocs

    🧛🏻‍♂️ Dark theme for Mkdocs

    HTML 119
  3. linux-profile/linux-profile

    🐧 CLI tool for managing linux user profiles with multiple powers make life easier and faster.

    Python 4
  4. dotflow-io/dotflow

    🎲 Dotflow turns an idea into flow! — Lightweight Python library for execution pipelines

    Python 9
  5. CSS 1
  6. FernandoCelmer/simple-blog-ui

    Terminal-style UI library for simple-blog. 38 Web Components that work in HTML, React, and Vue. Built with Lit.

    JavaScript 1

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Select a tier

$ a month

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$2 a month

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Support my open-source work — Owline, linux-profile, dotflow, email-profile. Shoutout on my README.

$5 a month

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Sponsor badge + name on my sponsor wall. You help keep Owline and my Python libraries alive.

$10 a month

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All previous + early access to new features on Owline (scrobbler extension, new integrations, mobile app).

$25 a month

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All previous + priority on GitHub issues across all my repos. Your bugs and requests get looked at first.

$50 a month

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All previous + 1 hour/month direct support — code review, architecture advice, or pair session.