Have you tried:
angel.co
triplebyte.com
they are both great resources for software engineers looking for jobs!
angle.co is a great place for finding a job in a startup (of all shapes and sizes).
I have personally never tried triplebyte.com, but I have head good things about it.
Also, go to meetups (meetup.com) around your area and start networking, it's never too late to start networking and meetups are a great place to start networking if you are new to it...
You can also start a blog+portfolio and go freelancing for a while. Most times freelancers get hired as full-time employees if they are working on large projects and the client recognizes the value you bring to the table and wants to retain you.