victor felder


i build stuff on the internet

I'm Victor Felder and vhf are the initials I usually use on the Internet.

I'm a university trained computer scientist. As a software engineer, I have been working in the Big Data field for a while before deciding to go back to designing, implementing and scaling web backends.

I spend time contributing to the open-source ecosystem by authoring open-source tools and software, creating open-source projects, writing technical articles, filing issues and fixing bugs in interesting projects.

You can get in touch by writing to contact@ this domain (

Some Projects

blog concise notes

→ my blog where I mostly write about technical things

→ also, almost 3 pageviews per day in average

project free programming books

→ a popular collection of free programming books featuring over 180 languages/topics/technologies in over 20 spoken languages

→ also, the third most popular github repository with over 77k stars

project v8 bailout reasons

→ a list of V8/Crankshaft bailout reasons

→ featuring reproductions, explanations and advices

project confusable-homoglyphs

→ a Python 2/3 pip package to deal with unicode homoglyphs

→ useful to prevent homoglyph attacks and IDN homograph attacks

project monomorphist

→ a JavaScript performance companion

→ trace V8 optimization status of your functions