You could just add a small story for each company on the work you did there and add that 2 start-ups failed imo.
Company 1, Location StartDate - EndDate
Role
I was responsible for implementing an iOS tablet app and
provided guidance to junior team members. In the end I did
have to leave the company after x months due to the start-up
failing.
Company 2, Location StartDate - EndDate
Role
...
You might have to change the layout of your CV a bit. Personally I have the following sections on my CV:- Contact Info
- Professional Experience
- Education
- Programming (I should rename it to 'Skills' or something)
- Certifications
- Languages
I think I'll do this and ask some recruiter friends of mine about how it looks :)
thanks, maybe I reply here and ask you if it looks good