Justin Cherniak
Principal at RecHub
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolJustin Cherniak is a principal software engineer and San Francisco-based leader with over a decade of experience delivering full-stack web applications and scalable systems. He currently leads RecHub as Principal, and previously steered Pinfire Studios as President and Lead Engineer, overseeing everything from recurring billing systems to web proxy tech and Moodle extensions. A versatile polyglot, he writes in PHP, JavaScript, SQL, and C#, and has hands-on experience across Android, Drupal, MySQL, Linux administration, and modern development workflows with Git and REST services. He is an active open-source contributor, notably fixing and hardening the moment.php library to improve DateTime interoperability and i18n support. His background also includes leadership roles building membership systems for large organizations and product-focused startups, reflecting a blend of engineering craft, product sense, and team mentorship. He holds a BS in Chemistry, Musicology, and Computer Science from the University of Wisconsin–Madison, underscoring a broad, interdisciplinary approach to problem solving.
11 years of coding experience
10 years of employment as a software developer
BS, Chemistry, Musicology, Computer Science, BS, Chemistry, Musicology, Computer Science at University of Wisconsin-Madison
Stackoverflow
1,726reputation
165kreached
13answers
1question
mysql
top-5%
php
top-5%
Github Skills (16)
momentjs10
php10
moment-js10
date-manipulation10
mysql9
ember-i18n8
i18n-js8
parsing8
rails-i18n8
text-parsing8
html6
yii6
solr6
jetty6
yii26
Programming languages (8)
Github contributions (5)
fightbulc/moment.php
Nov 2017 - Feb 2020
Parse, validate, manipulate, and display dates in PHP w/ i18n support. Inspired by moment.js
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 commits, 6 PRs, 1 comment in 2 years 3 months
Contributions summary:Justin primarily focused on fixing bugs and improving the core functionality of the `moment.php` library. Their contributions included addressing compatibility issues with the `DateTime` class, adding helper functions for creating `Moment` instances, and overriding existing methods to enhance the library's behavior. They also addressed edge cases and improved the library's overall robustness by handling negative UNIX timestamps and modifying method signatures. These modifications directly enhanced the library's interoperability and stability.
calendarphpinternationalizationparsingdates
pinfirelabs/mail_mime-decode
Aug 2018 - Oct 2023
Contributions:3 pushes, 121 branches, 2 tags in 5 years 3 months
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.