Echo Show 2015-2017, Amazon Search 2017-

● Led the search team for safaribooksonline.com● Drove improvements to the search experience, from user interface to infrastructure. Researched algorithms, improved scalability, ran experiments, wrote code, built consensus within senior management. ○ Added new features: suggestions, popularity sorting, hit highlighting, and facets ○ Started and ran machine learning program to improve relevance performance: led to boosts for popularity and exact matches, and optimized field weighting ○ Implemented analytics and reporting: drove improvements in search speed, precision and recall● Designed and implemented content recommendation service based on usage statistics: powers related content and suggestions on web site and e-mail marketing campaigns

● Build and maintain key content processing, indexing and search platform○ content loader: multi-threaded job scheduler, pipeline processor, XPath indexer, optimized to perform parallel I/O for high throughput○ search API: used by all sites to provide common search functions (full text and fielded search, facets, thesaurus expansion, spelling correction, etc) across multiple backends● Develop search-focused web sites serving millions of documents for academic publishers including oed.com (Oxford English Dictionary) and degruyter.com● Write proposals, hire and mentor engineers, foster engineering culture

I lead the engineering group, set the strategic direction for the company's big data installations, build search, data processing and storage solutions, write and support our data access and search API, and mentor other engineers in the group.