Inconsistency between requirements and working conditions
The requirements laid down by the startup founders don't always match the working conditions. You can search for a Senior hot-eyed specialist in the office located far away from the city centre. Nobody forbids you, and in addition, you can find a suitable pro who may agree to join your project despite such tough conditions.
But, as it happens, but there's one hitch: you have to offer something worthwhile in return: high salary (options don't work in this case), interesting work with ambitious tasks in a promising project, the possibility of quick career growth.