Let's say my company hired me to do programming in 'Software Stack A' which I have been doing successfully for around 3 years and I applied for the job initially with a Resume focused on 'Stack A' accordingly.
Now, due to changes in the environment and organisational change, company is branching out into using 'Software Stack B' in which I have been learning in my own time, putting together my own projects (unrelated to the company) and courses etc.
How to convince company that I can contribute and already have knowledge in 'Stack B' and that a person's skills isn't just the sum of their Resume + employer provided training ?
What "evidence" can I show of knowing these subjects without coming off as a) undermining other colleagues or b) having only studied these in response to the company's shift in technology (i.e. I used my own initiative and own time). ?
Edit: I think we will eventually move over to using B fully, but that hasn't been said.
Why I haven't taken the "obvious" (?) option of speaking to the boss directly and saying I can contribute... Because I'm not sure how to word it, so that it doesn't come off as if I have been preparing independently to move on from this company and go somewhere else that uses Stack B (before this decision was made).