Looking for an iOS App Development Company for Our Citizen Engagement Project

Our city wants to launch a simple iPhone app where residents can report issues like potholes, track service requests, and receive push alerts for emergencies. We are searching for an iOS app development company that has experience working with government or public sector clients. Does anyone know an iOS app development company that builds clean, secure, and easy-to-use apps and understands the basic security and privacy requirements we need to meet?