Vinícius Oliveira

https://vinipsmaker.github.io/ vini.ipsmaker @ gmail.com

C++ - Git - HTTP - Qt - async - MongoDB - Rust

Qualifications summary

• I like network-facing problems.

• I like to code applications where performance matters.

• I’m used to code cross-platform applications (this goes against previous point given you can tune performance even further when targeting a single platform).

Github/Gitlab Projects

• Emilua: Execution engine for Lua.

  • A complete (sync primitives, interruption api, cleanup handlers, fiber-local storage, you name it) fiber-based IO concurrency runtime for Lua.

  • Also implements an actor API to exploit multi-VM parallelism.

  • TCP, UDP, UNIX signals, UNIX local sockets, serial ports, name/service resolution, IPv6, TLS, HTTP, WebSocket, low-level controls (e.g. TCP OOB), filesystem.

  • Native plugins (i.e. DLLs) support to extend Lua functionality. It has been used to integrate Boost.Asio to foreign event loops (e.g. GLib).

  • Linux namespaces.

  • Implementation: Boost.Asio, Boost.Hana, Boost.PP, Boost.DLL, Boost.Nowide, re2c, code/bytecode generation, build systems integration, atomics, thread pools, events, async IO, flow control, scalable design, work units lifetime, deadlock prevention, non-blocking APIs, interruptible calls, (Lua) program crash handling, adherence to OS conventions, cross-platform.

  • Simple to use. It does a lot, the implementation is complex, but it’s simple to use (and it presents safe APIs).

• vinipsmaker/tufao: Event-oriented HTTP/WebSocket framework for C++ built on top of Qt.

  • Project started in 2011.

  • 359 stars on GitHub.

  • 19 users on the mailing list.

  • Inspired by Node.js.

  • C++, but cross-platform.

  • Great documentation (reference, tutorial, examples, QtCreator plugin to speedup…).

  • Very flexible.

  • I presented Tufão on one of the largest free software events in Brazil — FISL.

  • It gave me experience on how to coordinate collaboration with possible contributors, how to encourage positive feedback, run a free software project…

• libdepixelize » Implementation for the Kopf/Lischinski vectorization algorithm for depixelation of non-blended non-anti-aliased pixel art.

  • Developed as part of a GSoC 2013 project.

  • It was a great challenge to do research, learn from research (mostly documents that aren’t teaching oriented and aren’t easily indexed), play with math and implement an algorithm for which I found no alternative implementation that I could use for reference.

  • Gave me a taste of how awesome the Inkscape community is.

  • The opportunity to make improvements ^{[1] [2] [3] [4]} to an algorithm that were already awesome.

  • The opportunity to work with really smart people (I cannot express how much I enjoyed the experience).

  • Used in Inkscape to vectorize pixel art.

• BoostGSoC14/boost.http: This library can be used to create applications that need to expose services through HTTP (e.g. embeddable ReST services).

  • Developed as part of a GSoC 2014 project (somehow easier than my previous GSoC project).

  • Rejected to inclusion into Boost high quality C++ libraries in 2015.

  • Further funded in 2016 to be improved and submitted later again.

  • Many many tests and yet more tests being implemented.

  • CI for test under GNU/Linux, OSX and Visual Studio-based (including builds with sanitizers turned on).

  • It caused me a great change of perspective on how to think about asynchronous code and parsers.

  • It was a great project to develop the skill on how to elaborate good design.

  • Finally the opportunity to justifiably use some cool C++ tricks.

• vinipsmaker/tamanduang: a compiler class' assignment

  • My first Rust code.

  • A lexer for a shitty language that I’m designing.

• vinipsmaker/tufao-qtcreatorplugin: plugin for QtCreator IDE to easily create new Tufão projects

  • It gave me experience on how to work with mysterious APIs that are half-baked, underdocumented and break API every release.

  • Fair enough, it’s a very small project.

• vinipsmaker/logica-whopper: Just a logic class' assignment.

  • Simple Python program that evaluate some simple logic expressions.

  • Watch the asciicast.

• vinipsmaker/drunken-octo-sansa: Random code to solve random problems

  • Code created while I was training to compete on the ACM-ICPC.

• vinipsmaker/c-except: An exception system for C in a single header file

  • Just an experiment to see how I’d implement an exception system for the C language.

• vinipsmaker/dotfiles: Config files for my ArchLinux system

Technical Skills

• Programming Languages: Rust C++ Python JavaScript Java

• Frameworks: STL Qt GStreamer Boost.Asio

• Tools: Git CMake Emacs ZSH AWK

Professional Experience

• C++ developer, Expertise Solutions, Brazil (September, 2014 – September, 2015)

  • Implement JavaScript bindings for the EFL toolkit.

  • Technologies got to work on: C++ v8 EFL JavaScript Git autotools.

• Rust developer, MaidSafe, remote (June, 2015 – December, 2016)

  • Help the development of SAFE network.

  • Major parts of contributed code in Rust, but also took part on fixing code on the FFI boundaries between C and JavaScript (NodeJS).

  • Got to work with NAT traversal research and implementation.

  • Cross-platform and scalability issues related to network APIs.

  • Technologies got to work on: Rust Git.

• C++ developer, BlinkTrade, remote (February, 2017 – October, 2020)

  • Help develop a trading platform for cryptocurrencies.

  • Develop a fiber library.

  • Develop the web-facing gateway that absorbs most of the concurrency problems in the pipeline (routing requests, multiplexing many channels, keeping state synchronized, renegotiating state, broadcasting events, synthesizing lost events, ensuring DoS-protection limits, opportunistically compressing notification queues, perform proper scheduling strategies to avoid classical problems such as starvation and that kind of problem…​ and many more).

  • Implement JSON parsing ideas to merge multiple validation layers into an one-pass operation. You can have a grasp on the kind of ideas used by reading the review I’ve submitted to Boost.JSON.

  • Teamwork in the protocols design process.

  • Orchestrate dependencies in the C++ tooling hell for moving APIs.

  • Technologies got to work on: C++ Boost.Asio ZeroMQ WebSocket JSON.

Other Personal Projects

• Random contributions to open source projects

  • First contribution to a Rust project.

  • kbd patches.

  • EFL patches.

  • Wesnoth patches.

  • Some ArchLinux PKGBUILDs.

  • Translation contributions for the Enlightenment window manager.

  • Bugfixes for OpenPandora firmware.

  • gkeyring patches.

  • node-jsonrpc patches.

  • …

• Random bug reports to open source projects

  • One or two GCC bugs.

  • Packaging issues on ArchLinux.

  • One Choqok bug.

  • …​

Undergraduate Courses Taken

• I am a college dropout.

Extra Curricular Awards

• I used to maintain a podcast on the topic of computer science.

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1. https://vinipsmaker.wordpress.com/2013/08/20/should-i-really-target-kopf-lischinski/

2. https://plus.google.com/118295250366112843114/posts/84tLGpMFRe5

3. https://vinipsmaker.wordpress.com/2014/04/01/another-libdepixelize-update/

4. https://plus.google.com/118295250366112843114/posts/WXEWKtyetEN