Hello there, Nice to meet you!
I have read your needs, and I am ready to assist you in designing your calculator application!
My name is Greggy Gianini Firmansyah, an Mobile UI Designer who the right person to handle your design problems and ready to creating your design product with professionals.
I am very happy if the results of my work/design are very satisfying to you.
You can see my portfolio on my profile, my design covers simple, clean, and neat.
If you have questions, don't hesitate to ask via message or email, I'm ready to help you.
Thanks!
Regards,
Greggy Gianini Firmansyah