Pipeline Art sits between Art and Technical Art. In an environment where there are large team sizes, it's important to have a single figure who understands and directs the creation and improvement of the art pipeline and tools. A Senior Pipeline Artist is not necessarily the person to directly create the pipeline or fix it, they use their experience and understanding of both sides to work with Art and Technical Art to develop a path forward. This person could be seen as a "technically minded Artist".
While an Art Director deals with the pure visual style and quality of a project and an Art Lead deals with managing the team, it is the role of a Senior Pipeline Artist to ensure that artists know what technical requirements they have to adhere to, as well as ensuring that these requirements are met. Conversely they are also responsible for ensuring the Technical Artist's know which areas and working practises are inefficient, where staff knowledge could be improved and where tools don't deliver the clarity or adhere to the working requirements needed.
A Senior Pipeline Artist is in many ways the person who ensures "things get doneā. That problems are smoothed out, that priorities are clear and that issues are tracked and resolved. Due to the nature of the role it could be seen that a large portion of the responsibilities lie with outsource management and while this is true, it's important to visualise that both internal and external teams have the same basic requirements; to be aware of technical constrains, how to create assets and how those assets end up in the game.
You'll be working to direct the more junior Pipeline Artists on the team to integrate and check work from both external outsource partners and internal art teams. It's key that asset quality (both technical and visual) is the same for internal and external assets alike. Time is indeed money and the role is focused around ensuring that artists are spending more time making art and less time fiddling with exports or setting things up in game. Those issues should be reported to the Tech Art/tools team to address. During the early phase of a project the Senior Pipeline Artist is going to be blocking out assets to ensure that requirements from multiple disciplines are understood. This could be working out how modular scenery/pieces fit together or white-boxing levels/ideas in order to have test assets to develop the pipeline around, as well having something to bench mark performance and visuals to.