Call Tool is a phone canvassing web application used by both Obama for America and the DNC. In its simplest form, it provided volunteers with a potential voter to call and a relevant script to read. The volunteer could then record the answers from the potential voter, which were used to learn more about how the campaign should be operating or targeting individuals. Underneath its shell, Call Tool had a fairly complex architecture that proxied all of its data through our Narwhal API and interfaced with a Voter Checkout Service API and synced with 2 of the campaign's vendors. I architected and built the Call Tool web application and its communication with the Narwhal API from the ground up. I also extended several parts of the Voter Checkout Service to make it more performant, tighten protection against fraudulent callers, and better integrate with our vendors. As I took on other tasks on the campaign, I worked with other engineers and oversaw all development on the application.