Software: I have written production software for systems such as high-performance messaging libraries, Web search infrastructure (particularly index serving and load-balancing servers), and the original article similarity service for Google Scholar. I have worked on the design of software systems for cluster-level tracing, profiling storage availability and power management, among others.

Hardware: I have worked on several aspects of Google's hardware infrastructure such as the design of energy-efficient servers, high-availability datacenter infrastructure, storage systems, and I've started the team that designed the first generation of hardware accelerators for machine learning (TPUs). While at Digital Equipment (later Compaq) I was one of the architects of Piranha, an influential multi-core shared memory multiprocessor design.

Leadership: I have held top level executive positions and technical leadership positions at Google. As an executive I have built and managed two divisions at Google. In 2004 I founded the Platforms team, responsible for building our computing infrastructure, including servers, networking, and datacenters. In 2019 I founded the Core team, responsible for the common software tools and infrastructure used by all Google product areas. After stepping down from leading Core, I focused on coordinating technology roadmaps and decisions across the company, as the head of the Cross-Google Engineering Office. Before starting Core I led engineering for Google's Geo division, responsible for products such as Google Maps, Google Earth and Earth engine. For most of my Google career I have been an engineer and technical leader, as a Google Fellow.