Senior Backend Engineer for Real-Time Market Intelligence Engine
Budget: €750 – €1,500 EUR
We are looking for a senior backend engineer to build a high-frequency real-time market intelligence engine and responsive data dashboard deployed 24/7 on a Linux Hetzner VPS (Germany). Speed and long-term stability are our absolute business priorities.
### PROJECT COMPONENTS & ROADMAP:
1. Real-Time Data Engine & Architecture:
* Target endpoints: Three major German web platforms.
* The system must fetch lightweight JSON data embedded in page responses using asynchronous Python architecture (asyncio) to query all filters and platforms in parallel.
* Anti-Bot Engineering: Use specialized HTTP clients (like curl_cffi) to emulate proper TLS profiles and rotate residential proxy connections to bypass platform protections.
2. Telephony Backend & Carrier Integration:
* Configure Asterisk to bundle 3 independent German SIP Trunks (Deutsche Telekom, Vodafone, o2 Telefónica).
* The backend must use Asterisk Manager Interface (AMI) via TCP Socket to trigger simultaneous outbound calls to the seller's number when a match is found.
* Multi-Trunk Routing: The system must fire parallel calls. The millisecond one carrier connects, Asterisk must send a clean CANCEL to the other channels.
* Compliance: The architecture will organically broadcast the registered, real phone numbers assigned to my 3 trunks, ensuring 100% compliance with German telecommunication laws.
3. Flow Control & Automation:
* Connect the system with local PC Softphone (MicroSIP) using auto-answer headers so the headset opens instantly.
* Smart Redial Loop: If a line returns a busy or congestion signal, Asterisk must hang up and automatically restart the parallel call after a 500ms delay (up to 20 retries).
4. Web UI Dashboard & Management:
* Simple, secure frontend dashboard (JWT/HTTPS) to configure search filters, call histories, and real-time live alerts with audio sound triggers.
5. WARRANTY & PAYMENT TERMS (Fixed Budget: €1,500):
* 30-day post-launch warranty for bug fixes and routine endpoint adjustments.
* Strict Freelancer.com Milestone Escrow
### PROJECT COMPONENTS & ROADMAP:
1. Real-Time Data Engine & Architecture:
* Target endpoints: Three major German web platforms.
* The system must fetch lightweight JSON data embedded in page responses using asynchronous Python architecture (asyncio) to query all filters and platforms in parallel.
* Anti-Bot Engineering: Use specialized HTTP clients (like curl_cffi) to emulate proper TLS profiles and rotate residential proxy connections to bypass platform protections.
2. Telephony Backend & Carrier Integration:
* Configure Asterisk to bundle 3 independent German SIP Trunks (Deutsche Telekom, Vodafone, o2 Telefónica).
* The backend must use Asterisk Manager Interface (AMI) via TCP Socket to trigger simultaneous outbound calls to the seller's number when a match is found.
* Multi-Trunk Routing: The system must fire parallel calls. The millisecond one carrier connects, Asterisk must send a clean CANCEL to the other channels.
* Compliance: The architecture will organically broadcast the registered, real phone numbers assigned to my 3 trunks, ensuring 100% compliance with German telecommunication laws.
3. Flow Control & Automation:
* Connect the system with local PC Softphone (MicroSIP) using auto-answer headers so the headset opens instantly.
* Smart Redial Loop: If a line returns a busy or congestion signal, Asterisk must hang up and automatically restart the parallel call after a 500ms delay (up to 20 retries).
4. Web UI Dashboard & Management:
* Simple, secure frontend dashboard (JWT/HTTPS) to configure search filters, call histories, and real-time live alerts with audio sound triggers.
5. WARRANTY & PAYMENT TERMS (Fixed Budget: €1,500):
* 30-day post-launch warranty for bug fixes and routine endpoint adjustments.
* Strict Freelancer.com Milestone Escrow