Led a team to break up a monolith in Tableau's C++ analytics backend, so that other teams could access analytical features without constructing visualizations.Aided the design and development of an analytical query service. This work required re-plumbing the existing products to leverage this API and optimizing its performance for each new client.Developed a "nested resolving" algorithm that enables the new service to combine calculations from multiple data sources into a single query, enabling the development of composable data sources and Shared Dimensions support for published data sources.

Prototyped Tableau's nested sorting feature, including graphical mockups and functioning product builds. This feature shipped years ago and is in wide use today.Developed components of the Tableau Relationships feature, focusing on filtering and advanced analytics such as applying smart joins to calculation expressions.

Added prediction band and interval rendering to Tableau's forecasting feature, so these graphics could be rendered to five different output formats using the same code.Added a popular autocomplete feature to Tableau's calculation editor that lists fields and functions in a dropdown box when you type in their names. This feature works on both the web and desktop clients, encapsulating the autocomplete search logic on the server.Built an internal development tool that enables sparse branching in Perforce, so that developers can use a Git-style lightweight branching workflow with our Perforce SCM. This way of working has been taught at the company's boot camps for the past five years.Extended Tableau's level of detail calculations feature to support expressions as dimensions.

I developed the user interface of Tableau 8.0's popular forecasting feature, including the Forecast Options dialog and the Describe Forecast dialog.