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About Me

Software engineer with 15+ years (I got my first job in ~2001) of experience working with different technologies and devices (jack of all trades, master of some 😁). You might check out my LinkedIn or CV for more professional information.

Persistent hardhead (I'll try again and again, until I succeed), dad of two boys (🔥 + 🧊), challenge lover, bug hunter, soccer player wannabe, lego builder, fan of Italian food and desserts 🍨

Unfortunately I didn't contribute much to open source, but it was enough to make "jonas raoni" bring +24K records on GitHub and +32K for "jsfromhell". These little pieces of text have the power to transcend my own existence 😵

How I Code/Solve Problems

My key languages are JavaScript, C# and PHP, though in the past I've used C/C++, Pascal/Delphi and a bit of Java. I'm a practical person, who doesn't like much slow, long and repetitive things, so I naturally try to be concise and short in my codes, I also try to write things as performatic as possible. Since I like small challenges, I've started solving the tasks below in my micro spare time:

Chutes/snakes and ladders HackerRank solutions in JavaScript Codility solutions in C# LeetCode solutions in JavaScript

General Beliefs/Rants About Programming

  • Personal rule of thumb: Every now and then we're surrounded by new ideas and technologies, which means that everything we're building is already a kind of legacy, which will be dumped (errr transformed) a couple of years ahead.

    I think it's part of our job to make the transition easier, by minimizing the amount of code, complex architectures and customizations to the minimum. Choosing long-standing libraries and avoiding being an innovator/early-adopter might help.

  • Code fragmentation: The less code the better! Naturally the same should apply to the number of files, classes, tools, services, etc.

    Simple and small functions/classes (implicitly fragmented across several files) are easier to test, reuse, understand and difficult to break. I can't disagree with that! But in my experience debugging/reading such code highly increases my cognitive load, I feel like reading a book where each paragraph sends me to a random page, with no context, and switching between these pages is painful (unless when I'm the creator 😁).

    This way I generally try to avoid fragmenting too much the code and also creating too many abstractions... Basically, I think that a god method/class is horrible, but the inverse is not less cruel.

  • Micro-optimizations: I like them haha! But it's not fruitful to spend much time nitpicking (micro-optimizations) and sharpening your knife (overengineering) for a war that may never come, better to spend some time on macro-optimizations using a profiler ¯\(ツ)

  • Code complexity: Everything in life needs equilibrium, especially when a piece of code becomes so complex, that even its creator can't fully understand it without reading the code throughly. As there's no rules about it (what's simple for you, might be complex for me), I think it's enough to align the complexity with your team.

  • Dependencies: I'm against depending too much on specific features from closed source products/vendors, everything should be replaceable. On the other hand, I fully support using popular open-source projects, as you get support, documentation, testers and upgrades for free.

    After having some experience modernizing large legacy code bases, I'd say it's much better to use ready packages than hand-made code, even if you can do a better job.

    p.s.: I'm still trying to swallow micro-dependencies (hello node_modules), but well, as long as it saves you some lines of code, it should be ok...

  • Slow vs fast languages: I enjoy using the fastest language available, but in the end processing speed is overrated. For general applications, what really matter is having an effective data transfer/structure, as the key to performance is avoiding/delaying/throttling the resource usage.

  • Coding patterns: I see coding as a kind of art, so I'm not a big fan of materials spitting coding rules. Some people end up using those as a kind of "horse eye patch", which limits their alternatives, while the truth is that a problem might have N different (and equally great) solutions. But yeah, things are easier when everybody speaks the same language :)

  • Reinventing the wheel: Traditional jobs, require standard approaches. Despite that, I think reinventing the wheel is the best way to evolve something, it gives us freedom to filter out bad decisions and merge in the good ones, that's how disruptive tools/approaches are born.

  • Hiring in IT: We're often looking for our clone. Someone that thinks and knows the same things as us, and in this process a lot of great professionals are lost... And I think it's not possible to fix it.

    Big companies can afford to add more people/steps into the hiring process, to make it less biased (but more stressful for the interviewer) or to raise the bar with complex requirements, to ensure they are hiring an exceptional brain (hopefully they are not hiring a bazooka to kill an ant).

    For smaller companies I'd follow these priorities: indication from someone I trust > previous experiences/personal projects AND/OR offline coding/implementation test (not huge, but complex enough to allow the person to show his organization, reasoning and resource management skills) > soft-skills.

First Open Source Projects

A source of manually minified JavaScript snippets written with a friend a long time ago, when I had plenty of spare time. It's kind of abandoned, but I'm still using some codes from there 💯.


Code editor written in Object Pascal that used Scintilla under the hood, it was also my first open-source project. I've contributed with a lot of code and ideas, such as the transition from procedural code to an object oriented approach. The plugins were written in JavaScript and the interface of the editor could be customized with CSS (AFAIC we were parsing the CSS and building the interface based on it). Looks like the idea was great, given the popularity that tools such as "Electron" got 😵

Notes Editor

My GitHub Gists

Just small codes and notes which I thought wasn't worth to create a repository.

Random Facts

  • I've been working remotely since 2015, and I fully recommend it.
  • I got my first computer when I was around 10 years old, a 486-DX2. I've learned how to use it by spying my cousin giving classes about DOS (not DoS 👀), so I still remember something about: devicehigh=xyz, deltree, typing win to start the Windows 3.11, turbo button, sound blaster kit, cleaning the mouse ball, zipdrive, SCSI (the super fast disk that nobody had 😁), etc.
  • I've got access to the computer after finding the key (yeah, computers had locks) and discovering the password (which was errrrr "password" in my language 🤦‍♂️).
  • I've joined the internet after listening to some guys discussing about it and HTML in the classroom when I was ~14... I've got curious and once I arrived at home, I found an AOL CD and installed it, but well, it required a modem... Hopefully I remembered my cousin was talking about this device, when he was setting up a Dial-Up connection to play Duke Nukem online againt my other cousin (a real WTF at the time and, I still don't know from where he took all this knowledge haha)... So I found a great 13.4 Kbps modem in a box with old hardware pieces, cut some cables and it just worked! I still remember about using the internet at night to save money, losing the connection when someone was calling and the introduction of "download resumers" was awesome 😎
  • I still feel proud about my old codes, since I've created a binary parser (which was used by the MongoDB Driver), a big number library and other things in JS, some years before they were introduced to the language, it's cool when you get random (as I totally didn't need these things) ideas and make them work =]
  • Given that frontend has changed a lot these days, I don't have a specific preference to work in the backend/frontend anymore (it used to be the backend).
  • I took part into the contest where the creator of JQuery (John Resig) was starting to become popular haha (our entry is the number #2, John's entry is #3).
  • I've started reading about web stuff around 1997... It was the time when everybody was using AOL, chatting rooms (who knew how to write rainbow texts was considered a hacker haha), Yahoo Groups, SubSeven (o_O) and etc... I've got a 30-50 pages Word document and it was just enough to learn HTML/CSS. It was also talking about JavaScript, but I didn't grasp it at first (why do I need this crap?)... Errrrrr, not until I discovered it was used to create those cool mouse trails, blinking radios, etc. 😂
  • I've won a video game championship when I was a child (and others at my working place). The older guys (which lost for me by scores of 10x0), were praising me as a god 😂🏆
  • My first paid task was converting handwritten monographies to Word when I was around 13. I have nothing to complain, any amount of money is a treasure for a teenager haha.
  • My first programming language was JavaScript.
  • My favorite type of task is improving performance and diving into weird bugs.
  • My first home page is still accessible through the, but I'll never reveal its address! Some close friends must still remember about it 👀
  • I've got my first programming job around 2001, a kind of freelance job to work on the integration of a machine to test the cushioning system of cars using Object Pascal/Delphi (I didn't receive my last paycheck 😑). After that I've moved to another company which was building hardware to teach children, doing the same type of job... At a certain time, I've decided to join a university (which I just finished around 2014 with the introduction of remote courses)... There I was solving the exercises using minified codes in C, the teacher got interested in my skills and indicated me to work in a company which was developing mobile applications in C/C++. After that I've moved to a digital agency and I've been working with web related technology since then, mostly using C#, PHP and JavaScript.
  • I've been once a victim of a kind of social engineering attack... When I was 16, a friend of mine asked me to take a look on a game that he made and it had a hidden keylogger haha (that day I realized how ineffective antivirus were against unknown threats haha)... Hopefully he warned me later! These days I was looking for him in internet and looks like he became famous for earning prizes in online promotions, such as a CAR haha... I have a small guess about how he got the prizes 👀
  • I've been once a victim of a ransomware as well! Someone connected to my MySQL database years ago and renamed the databases to form a message asking for money (after that I've finally became a bit psycho with security) 💩
  • My favorite PC games were Euro Fighter 2000 (a flight simulator), Full Throttle, Indiana Jones, Quake, Duke Nukem and Warcraft, countless hours spent on them... The most revolutionary one was Carmageddon, my family was just shocked! Then it came a lot of trash games + the infinite Battlefield/Counter-Strike (I was the AK guy) seasons, which were then replaced by eternal (successful, but full of hatred against the game's AI) FIFA seasons, until I got retired from games 😂
  • I don't trust in the current state of crypto currency, but digital money is here to stay (I can't remember last time I've touched bills/coins)... Also descentralization in general sounds great given our failed leaderships.

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Popular repositories

  1. codility Public

    My solutions to exercises and tests at

    C# 44 39

  2. notes Public

    A code editor with support for dozens of languages, syntax highlighting, JavaScript macros/plugins, personalized smart indenting, debugger, folder search, etc.

    Pascal 7 8

  3. Persistent tree structure written in Pascal that can handle binary data.

    Pascal 4 2

  4. Math expression evaluator written in Pascal using pointers.

    Pascal 3 1

  5. A Delphi component offering resizeable shapes and also a container where it can be created.

    Pascal 3 2

  6. A Pascal stream class that is implemented as an interface, thus offering reference-counting.

    Pascal 3 3

478 contributions in the last year

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Mon Wed Fri
Activity overview
Contributed to pkp/pkp-lib, pkp/ojs, jonasraoni/hackerrank and 5 other repositories

Contribution activity

January 2022

Created 2 repositories

Created a pull request in pkp/ops that received 1 comment

Opened 42 other pull requests in 20 repositories
pkp/ops 4 open 1 closed 3 merged
pkp/omp 3 open 3 merged
pkp/pkp-lib 3 open 3 merged
pkp/ojs 2 open 4 merged
pkp/crossref-ops 1 open
pkp/reviewReport 1 open
pkp/COUNTER 1 open
pkp/crossref-ojs 1 open
pkp/usageStats 1 open
pkp/tinymce 1 open
pkp/staticPages 1 open
pkp/pdfJsViewer 1 open
pkp/orcidProfile 1 open
asmecher/lensGalley 1 open
pkp/googleScholar 1 open
pkp/googleAnalytics 1 open
pkp/customBlockManager 1 open
pkp/citationStyleLanguage 1 open
pkp/browse 1 open
getopt-php/getopt-php 1 merged
Reviewed 4 pull requests in 3 repositories

Created an issue in pkp/pkp-lib that received 4 comments

Improve data integrity by enumerating constants in the database

Describe the problem you would like to solve Several key fields in the database are related to hard coded constants in the code, which breaks the p…


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