Formal Employee Letters for Startup

I'm seeking a professional to craft three formal letters for my startup: an offer letter, an appointment letter, and a service letter that I can offer to one of my employee and should be on my company’s letterhead.

Offer Letter:
- This should encapsulate essential details such as:
- Salary and benefits
- Job role and responsibilities
- Start date and work location

Appointment Letter:
- This letter should include a:
- Confidentiality agreement
- Employee code of conduct

The tone of all letters should be formal.

Ideal candidate should have:
- Prior experience in HR or corporate communications
- Strong understanding of formal letter writing
- Ability to comprehend and incorporate startup-specific needs and norms.