Excel Invoice Template Upgrade

I need an experienced Excel macro developer to refresh and upgrade my existing invoice template.

Current Tasks:
- Generating invoices
- Transitioning from Pro Forma Invoice to Invoice to Packing List to Form 18s

Issues:
- Performance problems
- User interface difficulties

Ideal skills and experience:
- Proficiency in Excel macros
- Strong problem-solving skills
- Experience in creating user-friendly interfaces

Please provide examples of similar work done.