Add sendgrid email api to my codeigniter app which currently uses mandrill app

I am looking for a developer to add the SendGrid email API to my CodeIgniter app which currently uses Mandrill app. I have a SendGrid account and would like to utilize advanced email templates with custom fields. Additionally, I would like to integrate email list management with SendGrid. Ideal skills and experience for this job include proficiency in CodeIgniter and experience working with email APIs, specifically SendGrid. The developer should also have experience with email list management and the ability to customize email templates.

Budget: 30 usd.