I started doing the senior developer job.

I took ownership of the project, I checked on progress in planning, creative, etc, to ensure the clients goals were being met and that the project stayed on timeline and budget. I read all the documentation, both ours and theirs. I did my homework. I recommended changes that would save development time and money, but would make creative and UX happy, and would also meet the client’s goals.

I tried to understand the client, their pain points, their goals, and the industry they operate in. I paid attention to the whole process, recommended improvements to the process, tried to make other people's jobs easier, raised red flags early and honestly, and just generally tried to make project go smoother for everyone.

I didn't push for titles or raises, or even kudos, I just made projects work better. Somewhere along the line people started noticing “When Ryan's on a project, the client is happy, the other departments are happy, we make our budgets and timelines, and people don't stress as much… maybe he should be looking at all of our projects?” The title and the money follows from that.