iOS Clock-In/Out App Development

I'm looking for an experienced iOS developer to build a clock-in/clock-out app.

Key requirements:
- Generate Excel timesheet/report with:
- Total hours worked
- Break times
- Ordinary hours (Mon-Fri)
- Weekend hours (Sat and Sun)

Additional functionalities:
- User authentication method is flexible.

Ideal Skills & Experience:
- Proficiency in iOS app development
- Experience with Excel integration
- Strong understanding of user authentication methods

Please provide your portfolio and relevant experience.