I maintained Magento 1 store for a long time, migrated it to Magento 2 and keep maintaining as an account manager, architect and technical lead:
Migrated Subscription Billing extension from Magento 1 to Magento 2: architecture, providing technology leadership, managing team, supervising QA.
I migrated Magento 1 to Magento 2 and kept maintaining it as an architect and technical lead.