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