As a Senior SWE, I was a leader of and contributor to many projects while on the Timelines Infrastructure team. Highlights include leading a project where we modernized the infrastructure of one of the most highly-trafficked pages on Twitter, the Profile Page. For this migration I wrote a thorough and detailed design document, achieved consensus with engineers 2+ levels and 5+ years senior to me and led a team of 2-4 engineers for a year+ long project.