As a member of the earliest engineering team, I have worked as technical architect, lead developer, manager on many aspects of Bitglass platform from beginning of the company with focus on infrastructure, analytics, scalability, and reliability, but also have been involved extensively in other product features and operations.Major achievements during my tenure were:- Architected and implemented control plane data model (Django/AWS RDS) and CASB policy engine (C, Python, Go) in multi-tenant cloud deployment (AWS) that demands high concurrency and low latency.- Architected and laid the foundation of data analytics platform that provides near real-time data visibility (MongoDB, Elasticsearch, RabbitMQ, ETL, AWS Kinesis, Airflow), shadow ID discovery (Hadoop, AWS EMR, dimensional data model), and alerting.- Architected and led development of offline cloud app security posture management (CSPM) and data loss prevention (DLP) platform that scans mainstream cloud apps (Office 365, Google Workspace, Box, Dropbox, Salesforce, S3, Slack, Webex Teams) at high throughput (REST API, queuing, load balance, Coroutine).- Managed backend teams over a few transition periods.I am currently managing backend infrastructure team and working on the following projects:- Backend worker and database (AWS DocumentDB) sharding for better scalability.- Backend operational monitoring and alerting (InfluxDB, Grafana, AWS Timestream).- Containerize infrastructure components (Docker, Kubernetes) in collaboration with Devops team.- Python 2 to Python 3 migration of backend codes.In addition to the development responsibilities, I work closely with Devops team in operation monitoring and performance tuning, address critical production issues, review designs and codes, evaluate new infrastructure technologies, and recruiting.

Server, web, and mobile software infrastructure projects

Designed and implemented learning analytics feature of CK-12 e-learning platform end to end. The project comprised of analytics engine (multi-dimensional data model, in-db and in-memory aggregation, query rewrite, proprietary OLAP query REST API), event tracking JavaScript library, and visualization interface (SVG using HighCharts, D3.js and Raphael JavaScript libraries).Python/Pylons, MySQL CouchDB, JavaScript, JQuery, SVG, Apache, Amazon EC2

Responsible for design, implementation, and operation of server infrastructure of three web applications (video annotation, content discovery, and local deal marketplace). Main focus areas included data model, integration, reporting, infrastructure scalability and reliability, and many parts of the operations in a small team environment.Python/Django, MySQL, Cassandra, Hbase, Lucene, BIRT, Memcache, Squid, Heartbeat/DRBD, HAProxy, Flex, JavaScript, JQuery, Tomcat, Apache, Amazon EC2, SugarCRM

Responsible for design and implementation of a real-time event processing platform from ground up. The system analyzed XML event streams at real time and provided a rich set of time-series and aggregate functions.C++, XQuery, XML, BPMS, Flex

Oversaw development and provisioning of a hosted supply quality management and analytics application. Major customers are Caterpillar and GAP.J2EE, Oracle, Oracle BI /DW tools, JasperReports

D2K was an ETL tool company trying to get into application integration market. I led the development of a J2EE-based business process integration software product.J2EE, XML, EAI, BPMS, Web Services

As part of founding engineering team, designed and implemented a information integration web portal by integrating popular consumer web services via XML/SOAP.J2EE, XML, Web Services

Led server-side development of an e-commerce marketplace that hosts private label merchant stores. The platform provided essential tools to run online business including catalog, shopping cart, order management, payment service, customer support, reporting, and store-front builder.J2EE, Oracle, Versant, EDI

A member of Essbase server team and worked on new multidimensional OLAP query algorithms and performance tuning.C, Essbase, OLAP

Developed object database server features including multi-threading, transaction, concurrency control, recovery, replication, partitioning, security, and OQL binding.C/C++, OODB

Developed server features including concurrency control, OQL, and query tool in object-relational database system. (Omniscience was acquired by Oracle in 1995)C/C++, ORDBMS

Developed a medical electronic information system in a small team environment.Objective-C, C++, Sybase