Create an AI voice agent

Project Title:
Development of AI Voice Assistant Software for German Property Management Companies (Based on hallopetra.de & vetpal.de)
Project Description:
We are looking for an experienced development team or AI expert to build a custom AI voice assistant software inspired by hallopetra.de and vetpal.de.

The goal is to develop a scalable voice AI solution tailored to the needs of German property management companies ("Hausverwaltungen"). The software should answer incoming phone calls, understand the caller’s intent, and forward the call or provide relevant information based on predefined workflows – thereby reducing the workload of the internal team.

Key Requirements:

Voice AI agent capable of answering and processing inbound phone calls in German (high-quality NLP/NLU).
Intelligent call routing to the correct department or contact person.
Ability to respond to frequently asked questions using AI or pre-defined text-to-speech responses.
Customizable workflows to handle various tenant inquiries (e.g., noise complaints, heating issues, rental questions, etc.).
Simple drag-and-drop frontend (modular builder) that allows non-technical users to set up workflows and FAQ responses easily.
Integration with popular CRM/ticket/email systems (via API/webhook).
Web-based admin dashboard to monitor and configure call handling, view logs, and manage clients.
GDPR compliance, including proper consent for call recording and secure data handling.
Multi-tenant architecture for use as a SaaS solution across multiple property management clients.
References for Functionality & UX:
https://hallopetra.de
https://www.vetpal.de
Target Market:
German property management companies looking to automate and streamline daily inbound communication with tenants.
Deliverables:

Fully functional MVP or production-ready version of the voice assistant
Admin dashboard with drag-and-drop builder
Source code and documentation
Deployment assistance and optional maintenance offer
Technical Notes:
Voice AI must support fluent German
Backend: flexible, but scalable
Frontend: should prioritize simplicity and usability (no-code/low-code logic builder)
Use of existing frameworks like Twilio, Dialogflow, Whisper, etc. is welcome