Upgrading website created in Nette Framework

We have a webside coded in Nette framework. It works well. However it was not upgraded for several Years. We are looking for experienced Nette administrator/programmer to upgrade the code to the current version of Nette. We understand that the site might need to be upgraded a couple of times to get over itermediate versions.

The site works with large database containing very important information for us. All the information in the DB has to be preserved. However, for the upgrade works we can provide a small mockup database on which the process can be demonstrated.

We are open for offers to host/administer the upgraded site on a long-term bases.