I suggest two things. You can either do both, or pick one. 1: Go work for a startup, or an otherwise young company. Just remember to screen the company very ca

I suggest two things. You can either do both, or pick one. 1: Go work for a startup, or an otherwise young company. Just remember to screen the company very carefully, because working for a startup is inherently a little more risky than a large, stable, mature company. 2: In your 1-1s with your manager, make it abundantly clear that you're unhappy working on legacy technology and that you'd like to transfer to a team working on a newer stack. At the same time, network within your company to find a team that's working on a newer stack. There may be an internal job board you can look at too. (If your manager blocks you transferring to another team, see #1.)