Build the case first
Three things: (1) the scope that grew since you joined, (2) shipped outcomes with metrics, (3) the market rate for your role in the company’s base region. The third is the leverage; the first two are the warmup.
The conversation
Don’t ambush. Email your manager: "I’d like to discuss compensation in our next 1:1." Bring a 1-pager. Lead with: "Here’s the scope that’s grown, here’s the value, and here’s what the market pays for it. I’d like to move to $X."
Avoid these traps
1) Comparing to a coworker — never works. 2) Threatening to quit if you’re not ready to. 3) Accepting "let me check" without a date. Always end with: "Can we agree on a decision date?"
If they say no
Get the specific reason. If it’s budget, ask when the next cycle is. If it’s performance, get the gap defined. If you still want the raise after that, start interviewing — having a competing offer changes the conversation faster than any other lever.