Do you provide maintenance support or just development?
Yes, we also do maintenance.
We see that as continuous work after the first version is published. Releasing the first version of a software product is just the beginning. Our belief is that the real work begins after launch.
So we strongly encourage you to plan your budget so you can have a dedicated team working on your project after launch (this could be in reduced capacity). This option gives you confidence that the team monitors how the project behaves in the real world and acts quickly based on the data from the field.
Also, to create a successful product, you should iterate it based on the usage analytics – your users know best what they need.