Excel to Gmail Email Sender

I'm looking for a skilled developer who can create a program that will facilitate the sending of multiple emails from an excel spreadsheet, with a PDF attachment.

Key requirements include:
- Using Gmail as the email service provider.
- The emails will be sent to multiple recipients with the same content.
- The frequency of sending emails is irregular.

The main responsibilities of the program are:
- Extracting email addresses and any other necessary information from the spreadsheet.
- Attaching a PDF to each email.
- Sending out the emails.

Ideal skills:
- Proficiency in Python or similar programming language.
- Experience in working with Gmail API.
- Proven track record in developing email automation tools.

Please note that while personalization is not currently required, the program should be built in a way that adding personalization features in the future would be a straightforward task.