Looking to work as a java developer in a start up for Free

Hi everyone,

I am a software engineer with more than 3 years of experience, I have worked in java for more than 2 years for a startup. I have recently changed job and working as a .net developer. I am looking for a java based part time role(3 days/week), to work in a start up. I can work for free for a month or 2 and based on performance you can hire me part time(Its more for the learning experience so even if I don't get hired I would be happy). I am interested in start ups which are small and profitable. Please DM me you need a helping hand. Thanks.