Sorry, that seems to be a problem on other similar job sites too. I haven't yet thought about how to solve that problem, any ideas are welcome! Plus, with contract work I've sometimes had to negotiate with a client - I thought it would be better to therefore leave that detail to when the employer is having a conversation with the candidate.
Displaying a range for the salary/rate is certainly a good starting point. Obviously the final number is going to be decided based on experience and after some negotiation, but at the very least I'd like to not waste my time applying for jobs that pay a maximum of $50k if I'm looking for a minimum of $75k.
Reading some of the posted jobs, I can't tell if these are actual engineering jobs or $20/hr variety.