Looking for a backend developer

I am looking for a backend developer to set up a system where I can:
- Input new partners
- Upload Documents
- Integrate a payment system (Stripe)
- Integrate a CRM system (Salesforce or anything)
- Automated Emailing for order confirmations (to key stakeholders) - Mailchimp or another platform
- Collect and manage the data received from the purchase orders
- Creat blog posts for social media outlets.

Frontend has been developed on Javascript