I can build out a website, mobile app, or REST API for whatever you need! I am experienced in C#, ASP.NET, and AngularJS. We can sit down and chat about what kind of purpose, impression, timetable, and layout you want. I would operate with concrete deliverables and regular check-ins.

For the mobile app, I work with Xamarin.Forms and C#, so I can build cross-platform apps spanning across iOS, Android, and Windows. My profile has some informative links if you want to learn more about Xamarin.

I can also supplement any existing development team.
**I am not a UI/UX designer. Stuff like color schemes, artwork, and marketing are NOT what I'm offering**

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The best way to get an accurate cost/time estimate and prevent misunderstandings is filling out a specs sheet. Here's a sample for mobile apps (really I'd just like Section 2, but still don't worry if you can't answer all of it) https://www.slideshare.net/SudeepBhatnagar1/mobile-app-requirements-specifications-document-template-75358792
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I kept the pricing at units so we can discuss what "unit" would be best for the project. Some are better with deliverables/milestones, others are better with hours. Also, I'm still kinda new to this freelance stuff, I'm not good at eyeballing a price after an initial description yet lol