Senior Software Developer and Sysadmin

Senior Software Developer and Sysadmin. I have more than 20 years of experience in networking, sysadmin and software development. I just ended a long job (5 years) where I solo designed a medical device from scratch, including electronic, firmware and software. I am looking for small works (max few weeks) in development, sysadmin or consulting. For development, I would very much prefer to work on open source code.