Fix Email Verification System

I'm seeking a skilled developer to resolve issues in my existing login/signup authentication system. The workflow has been created, and front-end and back-end code, as well as environment configuration, are finalized using Java and Node.js.

Current Issues:
- Email verification errors: Verification emails not being sent using SendGrid
- Fix existing workflow for final integration
- Remove interference from previous login/signup process

Ideal Skills and Experience:
- Strong expertise in Java and Node.js
- Experience with authentication workflows and email verification systems
- Ability to troubleshoot and resolve email sending issues
- Familiarity with environment configuration and integration processes

Please provide relevant experience in your bids.