I am looking for an experienced hardware engineer to design a small custom PCB that includes: Required Electronics 1. Low-power Microcontroller • Must support 1 capacitive-touch / proximity sensing input (simple on/off state). • Ultra-low power consumption is required. 2. NB-IoT / LTE-M Modem • Preferred modules: SIM7080, SIM7000, BC66, BC95, SARA-N series, or any equivalent you recommend. • Must support eSIM or iSIM provisioning (no physical SIM slot required). 3. eSIM / iSIM Support • The board must include: • Either: an embedded eSIM footprint (MFF2 package) • Or: use an NB-IoT module with integrated iSIM • I will provide the eSIM EID for network activation during testing. 4. Power System • Powered by CR2032 coin cell OR a small Li-Po battery (100–150 mAh). • Deep-sleep mode required. 5. Sensor Input • The PCB must expose one metal contact pad that will be connected externally to a single metal pin. • No mechanical design needed — just the PCB pad routed to the MCU capacitive input. ⸻ Specific Firmware Behavior Required (If you can provide basic firmware — optional but preferred) • MCU continuously monitors the capacitive/contact input. • If the input changes from Touch → No Touch and remains in that state for ≥ 0.5 seconds, the MCU should: 1. Wake the NB-IoT modem 2. Send a small payload (HTTP/MQTT) 3. Return to deep sleep • If the input returns to Touch again afterward, MCU logs the state (no need for additional logic). ⸻ Board Specs • Approx size: 45 mm × 25 mm (flexible). • Prefer 2-layer PCB unless otherwise needed. • Clean, compact layout optimized for low-power operation. ⸻ Deliverables 1. Full schematic 2. PCB layout + Gerber files 3. BOM 4. 3D rendering 5. Optional: Basic firmware implementing 0.5s state-change logic + NB-IoT message sending ⸻ Important Notes • This is strictly a hardware design project. • No enclosure / industrial design required. • No additional product context will be provided — only the electronic requirements above. • Stability, clean routing, and low-power operation are essential. ⸻ Skills to Add • PCB Design • KiCad / Altium / Eagle • Embedded Systems • NB-IoT / LTE-M • eSIM / iSIM • IoT Hardware • Low-Power Design • Embedded C The payment will be after testing the board that it is working