- Working on this app he had to deal with various challenges that honed his problem-solving skills and expanded knowledge base. -Dockerized the whole application, building containers and services it relies on. - Developing and maintaining the crucial WP custom plugin used across all of the affiliate network websitesthe company owns. - Navigating and helping with the work of younger colleagues in my team -Optimized large database systems - Private key sharding mechanism integrating asymmetric cryptography - Built web app for Facebook marketing that sent notifications on Facebook, integrating Facebook API