// THE WHY
Why I Build
I like turning vague ideas into real products people can use. The best projects teach something, remove friction, or make a routine more rewarding.
Building in public
Marcelo Kopmann
I build practical products whereweb, AI, games & onchain systems meet.
Full-stack engineer turning ideas into useful tools, playful experiences, and open-source software.
Santa Catarina, Brazil Halborn
whoamiMark KopSoftware Engineer
$ cat focus.txt
web_products + ai_workflows + open_source + onchain_incentives
$ git status --short
● curious, shipping, learning
98Public repos
128GitHub followers
10+Years on GitHub
181Stars on top project
// ABOUT ME
The person behind
the terminal.
// HOW I THINK
How I Work
Ship a useful core, learn from it, then sharpen the experience. I care about clear systems, strong feedback loops, and code that stays understandable.
// BEYOND CODE
What Keeps Me Curious
Gamification, open source, onchain incentives, AI-assisted workflows, community tools, and the small details that make software feel alive.
// JOURNEY
2015Joined GitHub
2020Open-source bots & tools
2022Web3 products
2026AI & habit systems
// SELECTED WORK
Projects that
left the terminal.
Tools, experiments, and products built across more than a decade of learning in public.
01 / 10
HabitChain
A habit tracker with real skin in the game, using onchain incentives to turn consistency into commitment.
Visit project Source2025–2026
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HabitChain
A habit tracker with real skin in the game, using onchain incentives to turn consistency into commitment.
Visit project Source2025–2026
Minha Casa
A workspace for collecting real-estate listings, comparing properties, and planning a home purchase.
Visit project 2025–2026
Minha CasaProperty Platform
Stipend Helper
Extracts receipt data from PDFs with AI, converts currencies, and prepares stipend information quickly.
Visit project Source2025
Wedding Guest Planner
A focused tool to organize guest lists, invitations, ordering, details, and RSVP status.
Visit project Source2025–2026
NFT Marketplace
A complete NFT marketplace built to explore smart-contract commerce and decentralized ownership.
Visit project Source2022
Corvo Astral
A community-driven Discord bot that collects and serves useful information for Wakfu players.
Visit project Source2020–present
RepoGPT
Merges repository files into a clean text bundle for LLM context and code conversations.
Visit project Source2023–2024
Repo Env Generator
Scans a repository and identifies its environment-variable surface for faster project setup.
Visit project Source2024
Spotify Playlist Deleter
A small utility for selecting and deleting many Spotify playlists in one pass.
Visit project Source2023
Werewolf Moderator
A game-night companion that helps moderators manage roles and state in Werewolf and Mafia sessions.
Visit project Source2023–2024
// TOOLS OF THE TRADE
My technical
constellation.
Different tools for different jobs—chosen for the problem, not the trend.
01
Frontend
TypeScriptReactNext.jsSvelteTailwind CSS
02
Backend
Node.jsElixirPostgreSQLSupabaseREST APIs
03
Onchain
SolidityHardhatFoundryEVMPolkadot
04
Tools
GitHub ActionsDockerVercelOpenAIForgejo
> Building habit systems with meaningful incentives
> Exploring AI-assisted product workflows
> Maintaining open-source tools and community projects
> Shipping small experiments that teach something
// LET'S CONNECT
Have an interesting
problem to solve?
I’m always interested in thoughtful products, open-source collaboration, and systems that make work or life more rewarding.