• Development themes from scratch. • Development of custom features to replace paid apps. • Participate in the development of Shopify apps, including planning and creating their architecture, checking and integrating various APIs, attending client calls, and liaising with third-party service providers to ensure the successful implementation of the app's architecture. • Mentor and provide guidance to Junior developers, sharing best practices and techniques for coding on the Shopify platform. • Provided the strategy for speed optimization. • Connecting different payment systems via API, and implementing sales triggers.