Hello,
I am certified developer, which have experience in Magento from scratch implementations to fulfill customer requirements, also modification already existing stores. So far I have created many Magento extensions with various level of complexity, starting from base functionalities modifications, creating new ones, external services integrations, ending on custom checkouts. I can deliver you complex dedicated solutions, performance improvements or can simply help with a problem solving, not only regarding code, but also architecture / concept or business logic.
I have 9 years development experience, 2 years in Magento 2., 5 years in Magento 1.
Will be happy to offer my services with guarantee of high quality.
Best regards, Piotr.