Custom Invoicing Program Development

I am seeking an experienced developer to create a custom invoicing program for me that is accessible via web browser. The program needs to run on Windows and be mobile-friendly.

Key Requirements:
- Development of a user-friendly web-based invoicing program
- Compatibility with Windows operating system is a must
- Mobile optimization for smooth invoicing on various devices
If you don’t know how to create it please don’t accept.
Also I want to be able to have the ability to change logos
Additional Details:
- The program should allow for the generation of invoices using different templates. This is crucial for my invoicing process, so attention to detail is important in this aspect.
- Since I'll be using this program to invoice clients, it should be secure and reliable. I expect the developer to implement necessary security measures.

Ideal Candidate:
- Proficient in web-based application development
- Experienced with creating financial software or invoicing programs
- Knowledgeable in Windows development and mobile optimization
- Skilled in UI/UX design for a user-friendly interface.