[Subscription Service] [1]Calculate next charge date for the user and make the user understand subscription status through transaction record. [2]Provide agreement changing. [3]Remind users of the next charge date. [4]Provide campaigns to specific subscribers through customer grouping. [5]Develop Restful API (e.g., product information, purchasing, redeem, subscriber data and so on) to clients. [6]Send subscriber data to BI for data analysis. [7]Send subscriber transaction records to the revenue system for revenue share with developers. [Search Service] [1]Use a third-party service (Algolia) to provide fast queries. [2]Develop Restful API (e.g., search product) to clients. [Data Migration] [1]Implement Order migration (around 4 million records), wallet migration and bundle product migration [2]Build a project with a common module including db connection, db operation and useful function, for data migration. Achieve function reusing and increase development efficiency when developing together. [Hardware revenue share] [1]Use python script upload order data to google cloud storage through Jenkins to let BI team do follow-up processing. [Campaign Service] [1]Sync revenue proportion to revenue service when the admin creates or updates campaign information. [Recommendation Service] [1]Develop Restful API to recommend most popular and personalized content to users.