Modular Wireless Pyrotechnic Firing System Development (R6 / M6 Project)

I'm seeking an experienced embedded systems engineer to develop a modular wireless pyrotechnic firing system, focusing on reliability for a prototype.

System Components:
- R6 Handheld Transmitter (RF-based remote control)
- M6 Receiver Module (6 independent firing lines)

Key Requirements:
- Fluency in French
- Proficient in Electronics Design (KiCad v6 or v7)
- Skilled with STM32 Microcontrollers (HAL / CubeMX)
- Experienced in RF Integration (XBee PRO or similar)
- Capable of 2-layer PCB Routing
- Knowledge in Electrical Protection Design (buck converter, TVS, fuses, diodes)
- Bonus: Firmware Development (secure communication, R6 - M6 logic)

Ideal Skills & Experience:
- Embedded systems design
- RF circuit design and implementation
- PCB layout and routing
- Firmware development for embedded systems

Please provide:
- Portfolio or references
- Availability and estimated budget

I'm looking for a professional, detail-oriented partner for long-term collaboration.