Senior Software Engineer, Entrepreneur & Open Source Developer

I'm Alex Casillas 👋 a Senior Software Engineer working for Toptal, working towards Principal Engineering. I'm based in Córdoba, Spain. I'm an entrepreneur constantly working on side-projects and an avid open source developer

The Event Loop 🔄️

May 31, 2023

In this post, which is part of my next book, I'd like to talk about the event loop, and how it works in Node.js.

Help supporting Open Source ✨

April 13, 2023

I've maintained open-source for a long time and on my own, everything that I do is bootstrapped and self-funded, but as the open-source projects grow, so the expenses do.

A new "JavaScript Cooking Book" is coming your way!

April 10, 2023

I'm working on a new book! The next book in the series "The JavaScript Cooking Book", it's going to be all about NodeJS 💚

Introducing Cratebox.io: A global, fast content delivery network for NPM

March 30, 2023

When you’re building a website for a company as ambitious as Planetaria, you need to make an impression. I wanted people to visit our website and see animations that looked more realistic than reality itself.

Stay up to date

Get notified when I publish something new, and unsubscribe at any time.

Work

Company
Toptal
Role
Senior Software Engineer
Date
2021 Present
Company
OTPfy
Role
Chief Technology Officer
Date
2019 2021
Company
Accord
Role
Senior Software Engineer
Date
2019 2020
Company
Hanzo Studio
Role
Software Engineer
Date
2019 2018
Company
Vector ITC Group
Role
Software Engineer
Date
2017 2018
Company
Genially
Role
Software Engineer
Date
2015 2017