Full cycle back-end development for Java based Saas Cloud and OnPrem products. * Data Ingestion Micro-services development * Developing/enhancing multi-service EUM Saas Cloud which is fully scalable and Zero-downtime, running in the AWS ecosystem, such as designing/developing back-end Collector for SPA beacon, separating Aggregation Server into ApiServer and Aggregator. * Taking ownership of OnPrem EUM Processor: responsible for developing multiple components, creating build scripts and product installer, and charging the incoming escalations. * Full-cycle Snapshot micro-services development: pulling REST APIs from monolithic Platform and re-implementing them as micro-services that are deployed as Kubernetes clusters and managed by Amazon Elastic Container Service. * Full-Cycle Geo-Resolver development: Evaluating Maxmind and Neustar Geo Data, choosing the right data structures to repack 10G raw Neustar data into 500mb internal binary file, developing Geo-Resolver to meet our high performance requirement, and migrating EUM Cloud’s Geo Data from Maxmind to Neustar. * Work closely with the performance team, Customer supporters, and Ops to quickly resolve product issues. * Enhancing EUM Configuration UI. * Serving as mentor to junior team members.