A good indicator is the finances of the company. If you are going to be another cog contributing marginal value, for whatever reason that is, then it's going to be difficult to argue for better salary (thought they MIGHT give a higher salary, to everyone, like e.g. Google). If you can however have a big impact and they have good revenue or funding, then it's a lot easier to argue for higher salaries: "so you are making $300k MRR or just raised $5M of VC money with 4 employees? And you have more tickets and bug fixes to improve growth and reduce churn that you can feasibly do? Great, let's talk how I can effectively help to slash those tickets and then we can discuss my compensation*".
Classic: https://www.kalzumeus.com/2012/01/23/salary-negotiation/
* though if the company is crushing it so much, and specially because your marginal tax rate might be already at 50%, evaluate asking for some Stock Options/RSUs/etc.