Quynh N.

Hi, I’m a Senior Developer with 10+ years of experience, 25,000+ hours on Upwork, and 70+ clients served. I help startups and companies turn ideas into reliable connected products, from PCB and embedded hardware design to firmware, wireless connectivity, and IoT systems. “Very professional team, it was a pleasure working with them on the design of the system.” “Quynh and his team are great! Always available, always providing the right results. They even worked during their New Years' celebration, when my application had issues on production. Amazing guys!” 📞 Invite me to your job if you would like a FREE 30-minute initial consultation! 📞 Our Core Services ✅ PCB Design & Electronics Engineering ✅ Embedded Hardware & Firmware Development ✅ BLE & Wireless Device Development ✅ OBD-II / CAN & Automotive IoT ✅ IoT Devices & Gateways ✅ Hardware Prototyping & Bring-up ✅ CAD & 3D-Printed Prototyping ✅ Cloud & IoT Platform Development ✅ Product Architecture & DFM Products & Devices We’ve Developed 📌 BLE Wearable Devices 📌 OBD-II & Automotive IoT Devices 📌 Dual-Camera Devices with BLE & OBD-II Connectivity 📌 POS & Payment Devices 📌 IoT Sensors & Gateways 📌 Smart Home & Automation Devices 🌟 Expertise 🌟 PCB & Electronics 📌 Schematic Design & PCB Layout 📌 2-layer, 4-layer & Multi-layer PCB 📌 Digital & Mixed-Signal Electronics 📌 Power, Sensor & Communication Circuits 📌 BOM, Component Selection & DFM 📌 Hardware Bring-up & Debugging 📌 KiCad, Altium Designer Embedded Systems ✔️ ESP32 / ESP32-S3 / ESP32-C3 / ESP32-C6 ✔️ STM32 ✔️ Nordic nRF52840 / nRF5340 / nRF9160 ✔️ Embedded C/C++ ✔️ Device Drivers & Hardware Interfaces ✔️ BLE Firmware & Custom BLE Services ✔️ CAN / OBD-II Integration Connectivity & IoT ✔️ BLE, Wi-Fi, MQTT, HTTP, WebSocket ✔️ LoRaWAN, Zigbee, Z-Wave ✔️ CAN, OBD-II, RS-485, RS-232 ✔️ I2C, SPI, UART ✔️ LTE-M / NB-IoT ✔️ IoT Gateways & Edge Devices ✔️ Device Provisioning & OTA ✔️ AWS IoT Core & Cloud Integration Product Development 📌 Hardware Prototyping & Validation 📌 CAD & 3D Modeling 📌 Enclosure & Mechanical Integration 📌 3D-Printed Prototypes 📌 Hardware-Software Integration 📌 DFM & Manufacturing Preparation