My first experience with Magento 1.x was in 2012. I developed online stores, Magento 1.x extensions, and worked on performance optimization. Among the many developed extensions, I built a 1-page checkout. Made an integration of Netsuite & Magento 1.x. Fixed lots of bugs including the Braintree payment method for Magento 1.x.
Since 2020 I am working with Magento 2.x. I created a Payment Gateway for Magento 2.x and covered it with Unit Tests. Among others, I developed online stores based on Magento 2.4.x. Created Geodis, FedexInsight,
FedexCrossBorder, CanadaPost, and Pitney Bowes integration. Found and solve performance issues, using New Relic and Magento profile. Created RMA according to the customer's technical needs, wrote Technical
documentation and developed many more interesting tasks on Magento 2.