I am writing about my past job experience in a grant proposal. The proposal is in first person so I use "I" for most of it. At some point in the proposal, I describe a collaborative project where I worked as part of a team, hence I change to using the pronoun "we" where appropriate.
I asked a colleague to proofread my proposal and they criticize the change in point-of-view. I'm well aware if, for example, I were writing a short story, a change in point-of-view is a classic mistake (i.e. drifting from third person narration to first person). But this is an account of things I actually did, written from my perspective.
If you're writing an account of your work experience and you switch from "I" to "we" if and when you want to refer to actions that took place as part of a team, is that really problematic?