Nice to meet you, Adam!
We've reviewed your requirement and of course, that's possible - (invite-only private app). Also, we have checked that the app will be used by people who buy/sell/trade goods of any kind and be used to enter their sales data, track inventory and COGS and review simple accounting metrics. But I get a little bit confused when you mentioned the Tools: Calculator, Loan Calculator, ROI Calculator, etc.
So, would you like to brief me in detail further? Let's get connected and discuss it in detail.
I am Sagar. I have my own in-house team further providing you the one-stop solution. We are well versed in User-Friendly Design, Front-End Development, Back-End Coding for Web-Services, API Development/Integration, Unit Testing, Deployment, etc.
We have developed a wide range of iOS applications with back-end web services. We have worked on some various categories apps like Financial App, E-Learning App, Restaurants - Food Order & Delivery App, Taxi App, Fitness App, Doctor & Patient App, Real Estate App, Dating App, E-Commerce App, Social Networking App, and so on.
We have expertise in Swift, Objective-C, OpenGL of iOS, Core Services, Media, Development Tools (Xcode), back-end PHP MySQL, Node.js, Firebase, JSON & Parse, Angular, XML, MySQL, PostgreSQL, SQL Server, XML, HTML/CSS/JavaScript, REST APIs, Web services, Linux & other platforms, UIkit, Mapkit & native libraries.
Eagerly waiting for your response.
Thank you!