Design system architecture using microservices, Domain Driven Design, and CQRS patterns (Mysql, Elasticsearch, Kafka, Kafka Connect), establishing a code base for efficient team implementation. Build infrastructure on AWS utilizing Kafka, Elasticsearch, Redis, Mysql, Postgres, Kafka Connect, and KongAPI, along with setting up CICD, logging, and alerting frameworks. Collaborate with other departments to clarify and define requirements related to purchase orders, orders, inventory, and integration with ecommerce platforms. Migrate data from the old system to the new O2O platform. Serve as Scrum Master to guide the development process.

Use the Oracle database management system to store filtered data from various sources, and the ORACLE BI tool to create statistical reports. Use PLSQL to export data into reports for statistical analysis.

Programming the configuration of reporting formulas. Configuring user authorization. System administration development. Develop authentication and authorization using OAuth 2 to ensure system security.

Develop authentication and authorization using OAuth 2 to ensure the security of the system. Develop a video service to facilitate video uploads to storage, including transcoding videos to multiple formats (240p, 360p, 720p, 1080p) with storage in S3. Create a tool to assist other teams in filtering and removing outdated videos from the system. Write unit tests for all backend services, achieving approximately 85% code coverage to ensure quality.