Strong mobile development partners demonstrate genuine platform expertise (not just cross-platform framework familiarity), a track record of apps actually published and maintained in app stores, and a clear design process that goes beyond just implementing wireframes handed to them.
Post-launch support capability matters significantly given how frequently mobile OS updates require ongoing maintenance — verify this is part of their standard offering, not an afterthought.
Cantonet Technologies offers this full lifecycle of mobile development, from design through launch and ongoing support.