Duc L.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Dear Client, As a Expert Embedded System engineer, I do have rich experience in Embedded field with below ability which ranging from MCU level, Embedded Linux, GUI with QT development. Along with my understanding of the IoT system (Cloud, App, Gateway, End device). I am able to understand the overall project's requirement and find out the solution/build system architecture which robust, logical and easy maintain in the future. My Expertise: 📌 Embedded MCU: ✅ Programing of ESP32, CC2538, CC1310, NRF52, Free RTOS, Contiki-OS, Zephry OS, Update OTA via GPRS/LTE/WiFi/BLE/Openthread. ✅ Expert in IoT protocols such as LWM2M, COAP, MQTT. ✅ Expert in wireless network such as OpenThread, Matter, Bluetooth, WiFi, Ethernet. ✅ Have experience of the peripherals: ADC, RS485, RS232, PWM, I2C, SPI, UART, CAN, USB. ✅ Sensor: Temperature, Humidity, Light, water sensor, CO, GAS, Smoke sensor, CO2. 📌 Embedded Linux ✅ Expert in: STM32mp1, SC20, Raspberry pi, Beaglebone, Shell script, C/C++, Node js, QT/QML. ✅ Expert in Embeded linux builder system: Yocto, Buildroot, OpenWRT. ✅ Linux programing skill: Driver development and porting, IPC, D-Bus, Multithread, Micro Service system. ✅ Expert in protocols such as HTTP, MQTT, COAP, LWM2M, RTSP. ✅ Rich experiences to integration Linux with LTE usb dongle, LTE module, WiFi, bluetooth, Ethernet, Audio codec chips, RTC, Battery, ... ✅ Be familiar with ffmpeg, audio/video decode (H264, H265, V4L2, ...) Working experience ✅ Design architecture and Developing Smarthome system using Openthread and bluetooth (STM32mp157c, nRF52, CC2538, LWM2M) ✅ Developing multi IP camera HUB for Image processing system. ✅ Developing RTSP server. ✅ Developing IVI Display device for truck using QT/QML framework. ✅ Developing Multi-room audio device (airplay2, bluetooth 5.0, music server manager). ✅ Home gateway for Smarthome application.