- Developed, maintained, and refactored backend and infrastructure services. Familiar with caching and encoding modules. - Contributed to upgrading Python by replacing 20 web framework APIs from webapp2 to flask, updating utilities and routings, and executing data format transformations of 20 million records in a schemaless database through MapReduce while ensuring forward and backward compatibility. Increased Python3 test coverage by 10%. Upgraded libraries, including picking, memcache, encoding, defer, OAuth, and protobuf. - Enhanced cost and effort efficiency by reducing API calls by 10% through strategic pruning of high-request, low-value APIs. Additionally, streamlined database table organization, optimized backup frequency, and restructured the file system to facilitate easier search and management. - Collaborated with the data team to define user activity data and implemented a streamlined process for instant and detailed data streaming to Bigtable, enabling efficient analysis.