I don't want to be a Debbie Downer, but I had that exact surgery (second of three step j-pouch) almost 4 weeks ago and I'm still mostly laid up. You'll probably do better than I am, but know that it's possible to take a long time to bounce back! I had major issues with nausea and didn't get good nutrition in for the first two weeks following surgery, which delayed my healing a lot.
Edited to add: However, I did just read the job description you provided more carefully, and even though I'm not feeling great right now, I think I could handle doing that; sounds pretty low key. I bet you'll be fine!