[mratzloff]

Without knowing the performance requirements and where the current system is failing, it's hard to know if the technology stack will work for your needs—with one exception.

If users speak SQL, they will reject Mongo. The users of the system are the ones who will determine project success or failure.

Think about the data analysts, product owners, etc. who use the system. Interview them. Find out exactly how they use the system currently. Do they query in an ad hoc way? Do they rapidly iterate on their queries? Watch them interact with the system. If it's any way other than through dashboards that an engineer updates on request, you are in for rough seas.

Users must always determine the contours of a new system. There are big data solutions that speak SQL. Some are cloud-based, some are not. Some are faster than others. The team should be able to show you why they rejected those as solutions.