Integrate SendGrid API for Automated Email Notifications

Project Overview: We need a backend developer to connect our web application's signup form to the SendGrid API to trigger automated emails. Expected Output: - A server-side function/endpoint that triggers a welcome email immediately upon successful user registration. - Dynamic data insertion (e.g., embedding the user's first name and a unique confirmation link into the email template). - Basic error handling and logging to ensure failed delivery attempts are captured. Required Skills: - Node.js / Express (or Python/Django, depending on stack) - Experience working with SendGrid API or similar transaction email services - Secure handling of environment variables (.env) for API keys Important Details: The HTML/CSS email template is already designed and ready. Your primary focus will be the logical backend implementation and secure API integration.