Odoo Setup for Customized Subscription Model

I need an Odoo expert to set up the Sales, Inventory, and Accounting modules for a subscription model product. This requires some customization, particularly in the following areas:

Billing Cycle: Needs adjustments to fit our unique requirements.
Customer Portal: Customization for a better user experience.
Email Notifications: Tailored notifications based on our needs.

Ideal Skills & Experience:
- Proficient in Odoo
- Experience with subscription models
- Strong customization skills
- Knowledgeable in Sales, Inventory, and Accounting modules