As OpenSafe is a Start-up, there was almost everything to do in system administration.
Like so, I did the whole new servers architecture for each services.
Which include a hyper-visor, backup manager made for the need of the company, diagnostic tools and some other.
And, as an intern, I knew that I will not stay in this Start-up... Therefore, I did a documentation about everything I did, so like this, any people that come after me will have access to all the important knowledge about the system administration of this Start-up.