My most recent startup role was Lead Software Engineer in the San Francisco office of Rinse. (Btw, have you tried Rinse? You really should.)
From day one, my work there pushed the usual boundaries of a senior engineering role.
I stepped right up to lead the technical pieces of our corporate rebranding, and ended up directing the in-house portion of the design effort as well. The result? A beautiful new customer-facing experience that more than doubled the company's growth.
Much of the work lay beneath the shiny surface: modernizing mobile apps for operational staff, tuning API performance, creating internal tooling, making architecture decisions, managing people and process.
I pushed the company forward on everything from increasing testability to reducing repetitive UI gestures. Those saved seconds directly translated to thousands of dollars each day saved in employee time, significantly improving the company's profitability over time.
Most importantly, I worked hard to unblock, to encourage, and to take on tasks that grew our entire engineeering team's productivity.