AI Phone Assistant SaaS Development

Project: AI Phone Assistant SaaS –

„Competitors for reference and inspiration only (no 1:1 copy):
– hallopetra.de
– meiti.ai

1. Project Goal
We are looking for an experienced software developer or small team to build a functionally equivalent clone of hallopetra.de.
The goal is to create a stand-alone SaaS product (white-label capable in the future) that can be marketed under our own brand in Germany / EU.
This is not a simple website, but a real AI + VoIP SaaS platform.

2. Core Features (MVP – Required)
AI Phone Assistant
Handle incoming phone calls automatically
Natural language conversations (German required, English optional)
AI-driven call flow:

Greeting
Understanding caller intent
Asking follow-up questions
Taking messages / booking callbacks / forwarding calls
Call transcript (text)
Optional call recording (GDPR-compliant, opt-in)

Telephony & Infrastructure
SIP / VoIP integration
(Twilio, Sipgate, Placetel or similar – developer recommendation welcome)
Multiple phone numbers per customer
Call forwarding & business hour rules

Webhooks for call events
AI & Speech Technology
Speech-to-Text
Text-to-Speech (natural voices, not robotic)

LLM integration (OpenAI or comparable – developer recommendation welcome)
Editable AI prompts per customer (via dashboard)

Customer Dashboard
User registration & login
Phone number management

AI assistant configuration:
Tone of voice
Greeting text
Business rules
Call history & transcripts

Usage statistics:
Number of calls
Call duration
Cost overview
Invoices & subscription overview

Billing & Subscriptions
SaaS subscription model
Monthly plans (e.g. minutes-based or calls-based)
Stripe (or equivalent) integration
Automatic invoicing
Upgrade / downgrade / cancellation

3. Frontend & Design
Modern, trustworthy SaaS look
Fully responsive (desktop / tablet / mobile)
Maybe Laravell

Preferred tech:
React / Vue / Next.js
Tailwind CSS or similar

4. Backend & Architecture
Preferred stack:
Node.js / Python (FastAPI) / Laravel
Clean API-based architecture
Multi-tenant SaaS (multiple customers)

GDPR-ready basics:
Data deletion
Opt-in for recordings
EU server hosting preferred

5. Out of Scope (Optional Later)
Mobile apps
CRM integrations (HubSpot, Salesforce, etc.)
WhatsApp or chatbots
White-label reselling system

6. Deliverables
Fully functional MVP
Source code (Git repository)
Setup & deployment documentation
Basic handover / explanation
Optional: deployment on our server

7. Freelancer Requirements
Proven experience with:
VoIP / telephony APIs
AI / LLM integrations
SaaS platforms
Subscription billing systems

Please include in your proposal:
Relevant project references
Suggested tech stack & architecture
Estimated timeline (MVP)
Fixed price or milestone-based offer

8. Budget & Timeline
Budget: open (realistic offers only)
Target timeline: MVP within 6–10 weeks