iOS SciCalc App

I'm seeking an experienced iOS developer to create a high-performance mobile app for scientific calculations based on an Excel sheet.

Requirements:
- Simple input and output
- One to two screens max
- User input via dropdown menus
- High-quality graphics
- Fast processing speed

Ideal Skills:
- iOS development (Swift, Xcode)
- Experience with dropdown menu inputs
- Strong UI/UX design skills
- Background in scientific calculations
- Proficient in integrating Excel-based calculations

Please share your relevant portfolio and experience.