I would try to gently put them on the back foot when they offer a wage.
When you receive the offer, you should comment on the differential between expected and offered wage, even if you intend to accept. For example, you might say with a gently puzzled tone, "this is lower than what I would ideally be earning, based on my experience and capabilities. Can you explain how you came to this number?"
You may be able to push back on them a little bit. You will be able to tell if there's room to negotiate, based on the response to you. Don't overdo it, as simply commenting on the differential and seeing how they respond is a way of gently squeezing them. If it seems the number is negotiable, ask if they can compromise with (for example) $33. The art is in doing this in a confident and friendly way, so that the position doesn't collapse.
Whatever number you set as the price you want, don't waver on it after it escapes your lips. Let them consider the number unless it's clear there will be no budging. If possible, do some research on other roles or other engineers you know in the business, so that you can justify your ask. It's not your standard of living that sets the price, it's your alternative job and their alternative hire.