I am looking for an experienced developer to build a few Firebase Cloud Functions with integration to various Google Cloud AI services. These functions will power a web-based SaaS platform and must include secure handling, authentication, and API support.

General Requirements:
1. Use Firebase V2 Cloud Functions
2. Language: TypeScript or Python
3. Must integrate Firebase Authentication
4. Functions should support API calls from a web-based SaaS frontend
5. All request/response payloads should be encrypted and decrypted

Function Details:
1. Two Functions to fetch data from Firebase Firestore and call the Gemini LLM model
2. One function to process image files and extract text using Vertex AI OCR
3. One function for speech-to-text conversion using Google Cloud services
4. Function to send emails via SendGrid

I need someone with experience in Firebase, Google Cloud AI/ML services, and secure serverless function development.