The Twilio and Shopify holiday developer contest aims to encourage developers to leverage the power of both platforms to create innovative eCommerce solutions during the holiday season. By combining Twilio's telephonic capabilities with Shopify's one-stop solution for online stores, contestants can build a wide range of applications, such as easy-to-add notification plugins, click-to-call product audio tours, and post-fulfillment surveys. The contest offers three prizes, including a MacBook Air and LEGO Mindstorms swag bag, and is open to developers who use Twilio and Shopify APIs. Submissions are accepted via a form on the Twilio website, and contestants can get help or feedback from the community through forums or email.