A selected list of personal projects


An early-stage distributed game, Tiwe is an experiment that touches distributed systems, consensus algorithms, cryptography, protocol design, and even blockchain.


Progressing slowly and bringing opportunities to read and learn more about interesting, often unexpected, topics.

Coding Dojo Brno

The Coding Dojo Brno is a weekly community event in Brno, Czech Republic.

Coding Dojo Brno

It started in early 2016 as a means to spread programming skills and techniques.


redgreen is your companion during TDD sessions.

redgreen screenshot

This tool provides instantaneous feedback about the current state of a test suite, automatically triggered whenever a file changes. It shows a green or red bar and a history of the previous test runs, useful for keeping track of clean refactors from green to green.


typokiller is a tool to automate spellchecking source code.

typokiller screenshot

It can be used to find and fix typos in comments, documentation and text files in general.


XMPPVOX is a chat client for blind computer users.

XMPPVOX screenshot

It literally breaks barries, as it enables visually impaired people to communicate with their peers in a transparent way, by means of Text-to-Speech and a specially-crafted command interface.

With XMPPVOX, it doesn’t matter whether you’re blind or not, nor whether you’re talking to someone who also uses XMPPVOX or any other chat client.

Behind the scenes, it is multiplatform adhoc-proprietary-protocol-to-XMPP bridge that connects DOSVOX users to XMPP networks. Since DOSVOX is available on Windows only, XMPPVOX is currently distributed as a single Windows executable.


Shenmeci is a Chinese-English-Chinese online dictionary.

Shenmeci screenshot

With Chinese text as input, it does a dictionary based word segmentation (Chinese has no whitespace) and provides translation for each word.

For non-Chinese input it searches for entries in the dictionary quickly using a full-text index.


elephant-tracker is a usage tracker.

It is a web server companion for XMPPVOX, keeping information about how XMPPVOX is being used.


DAWGo is a Directed Acyclic Word Graph library.

Directed Acyclic Word Graph example

It is used in Shenmeci to build the Chinese word segmentation engine.

Coding Dojo Rio

The Coding Dojo Rio was started in late 2008 and is pure reason to smile :-)

Coding Dojo Rio party time

DojoRio is the first open Coding Dojo group in the state of Rio de Janeiro, Brazil. It grew big, has had several branches in the city and state, and even influenced the creation of new Coding Dojos around Brazil and the world!

It’s a weekly event in which people exchange knowledge and practice programming techniques and soft skills. At this point, it is certainly one of the oldest uninterrupted coding dojos in existence around the world.

Coding Kwoon Beijing

The Coding Kwoon Beijing was an early-stage community-building project started in 2013 in Beijing, China.

Coding Kwoon

This was an effort to spread the Coding Dojo culture in China, sharing skills on programming techniques, team work and communication.