Need a Habit Tracking Mobile App Built

I'm planning to launch a habit tracking application and need an experienced mobile developer to build it from the ground up. The core idea is simple but the execution needs to feel polished: a user creates the habits they want to build, marks each one as done for the day with a single tap, and immediately sees a visual chain of consecutive days completed, since that streak display is what keeps people motivated not to break the chain.

Beyond the daily check-in, the app needs a reliable reminder system so every habit can have its own notification time chosen by the user, plus a statistics screen that summarizes progress by week and by month so people can see patterns rather than isolated days. I'd like the interface to feel encouraging rather than clinical, with simple charts, streak counters, and maybe light gamification such as badges for milestones.

I can share a rough wireframe and a few reference apps I like, but I'm open to your suggestions on the tech stack, whether a native build or a cross platform approach fits better, and how to structure things so habits can eventually sync across devices.

What I'd like in your reply:
— Daily check-in for every habit in one tap
— Visual streak, a chain of completed days
— Reminder time set individually per habit
— Weekly and monthly statistics screens
— Similar apps you've built, your timeline and stages