Building Deep Research Systems

With nearly two decades of experience at Google, Apple, Zillow, Walmart, eBay, and several startups, Andrei has built and scaled advanced search, recommendation, and AI systems serving billions of users. His work spans machine learning, NLP, and large-scale software engineering, focused on turning cutting-edge research into impactful products. A frequent speaker at AI and industry conferences, he specializes in AI strategy, system architecture, and helping organizations translate innovation into measurable business value.

Doug Turnbull helps clients build better agentic search systems. He led machine-learning-driven search initiatives at Reddit, significantly improving search relevance through Learning to Rank methods. Doug also advanced e-commerce search at Shopify and served as CTO at OpenSource Connections. He co-authored the influential book Relevant Search (Manning, 2016) and created popular open-source tools, including Quepid and the Elasticsearch Learning to Rank plugin. He regularly speaks at industry conferences, making search relevance accessible to engineers.