Hi,
I am a MSSQL BI Developer/Architect with 15 years experience and a few certifications.
I never developed on DataZen but it looks like a good choice because pretty straightforward.
In my opinion, you need someone with great Database Architect knowledge, because if you Data warehouse is well structured and supplied, The reporting with DataZen will be very smooth.
Lets chat about the project (I don't speak Spanish)
Jo