How do you negotiate a salary offer without inventing your market rate?

Thank them, repeat the number, and ask for time if you need it. A workable next sentence is: "I want this role. The work I have already done on [a specific result] is why I am asking whether the range can move." Fill the bracket with something you can show. Do not fill it with a percentage you did not measure.

This page used to claim that a respectful ask never costs an offer, and that most people accept the first number. Neither claim has a primary source here. Both are cut.

Use the offer, the range in the posting, or a published wage for the occupation. The Bureau of Labor Statistics is the primary source for U.S. occupational pay. One example already checked: computer network architects had median pay of $130,390 in May 2024, and employment is projected to grow 12 percent from 2024 to 2034 (E5). That figure is for that occupation, not for "tech" in general.

If you cannot name the table, do not name a range. Saying "I was hoping for more" is weaker than a sourced number, and it is more honest than a number you made up.

Ask what is flexible if base pay is not: start date, level, review timing, or scope. Write down what they say. You are collecting a fact about this offer, not winning a script contest.

Then go back to the posting. The requirements you can already prove are the ones you can talk about without stretching.

Run Job Match (5 tokens) on the posting so you know which lines of proof you will actually say. The salary tool can help you prepare the conversation. It cannot invent a wage the Bureau of Labor Statistics did not publish for your occupation.