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Hi, I'm David. I help turn complex electronic concepts into dependable, production-ready products. With over 5 years of practical experience, I support clients through the full development cycle, from initial design to functional prototypes and manufacturing handoff. My focus is on building efficient, scalable, and cost-conscious hardware systems that perform reliably in real-world conditions. 1. What I Deliver: Embedded Systems & Hardware Development - PCB Design & Hardware Engineering: Circuit design, multi-layer PCB layout, component selection, impedance tuning, compact design, and cost optimization. Emphasis on IPC standards, signal integrity, EMI/EMC mitigation, and thermal considerations. - High-Speed & Complex Systems: Hands-on work with DDR, HDMI, MIPI (CSI/DSI), PCIe Gen1/2, along with SoC and FPGA-based prototyping. - Embedded Platforms: STM32N6, STM32H7/STM32H5, STM32F7/STM32F1/F3/F4, ESP32/ESP8266, Nordic nRF52 series, ARM Cortex-A systems, Raspberry Pi (CM4/CM5), Zynq-7000. - Power & Mixed-Signal Design: Switching regulators (Buck, Boost, Flyback), LDOs, battery systems, motor control (BLDC, stepper, servo, DC), and analog/digital integration, PoE, LLC. - Manufacturing Readiness: BOM preparation, Gerber generation, and design adjustments to streamline production and reduce costs. - Tools: Altium Designer, KiCad, LTspice, Proteus, MATLAB/Simulink . 2. Firmware & Software Development - Programming: C, C++, Embedded C, Python (for automation and validation). - System Development: Linux-based platforms, MCU firmware, RTOS (FreeRTOS), power optimization, bootloaders, OTA updates, and debugging. - Connectivity & IoT: WiFi, BLE, LoRa, Zigbee, GSM/LTE/NB-IoT/5G, GPS, RFID, NFC. - Communication Interfaces: UART, I2C, SPI, I2S, RS232, RS485, CAN, Modbus RTU/TCP, USB, Ethernet. - User Interface: LVGL-driven GUIs, TFT/OLED displays, and touch interfaces. 3. Development Process & Collaboration - Product Lifecycle Support: Concept → prototyping → validation → production handover. - Workflow & Management: Organized development using Git, Jira, and structured documentation with clear milestones. - Global Collaboration: Experience working across US, EU, and Asia time zones with consistent communication. - Troubleshooting: Strong capability in diagnosing and resolving both hardware and firmware issues. 4. Why Choose Me? - Unified Skillset: Combined hardware and firmware capabilities help minimize back-and-forth and speed up delivery. - Practical Engineering Approach: Designs are built with real-world constraints in mind — not just theory. - Efficiency-Oriented: Focus on reducing unnecessary costs while maintaining performance and reliability. - Clear & Responsive Communication: Regular updates, well-documented progress, and quick feedback. Looking to bring your idea into a functional, well-engineered product? Feel free to reach out. I’d be glad to discuss your project !!!

* Expert-level Embedded C/C++ development for MCU and Embedded Linux platforms. * Strong expertise in Embedded System Architecture, system design, and technical leadership. * Extensive experience with ARM Cortex-M/A, STM32, NXP i.MX, Nordic, ESP32, TI, and Qualcomm platforms. * Advanced knowledge of RTOS and Embedded Linux: FreeRTOS, Zephyr, Yocto, Buildroot, Linux Kernel, Device Drivers. * Experienced in BSP bring-up, bootloader development, OTA/FOTA, secure boot, and system optimization. * Strong experience in Automotive and Industrial Embedded Systems development. * Deep understanding of CAN/CAN FD, LIN, UART, SPI, I2C, Modbus, Ethernet, TCP/IP , BLE, and MQTT. * Hands-on experience with IoT, Edge AI, connected devices, and cloud-integrated embedded systems. * Experienced in debugging, hardware-software integration, and system optimization. * Experience leading engineering teams and managing embedded projects from concept to production.

I deliver production-ready embedded solutions from concept to manufacturing. With expertise in both hardware and firmware, I design reliable 2-4 layer PCBs and develop robust firmware for ESP32, STM32, Nordic nRF, and ARM MCUs. My work includes: - PCB Design: Schematic & layout (Altium Designer, KiCad), Gerber files, signal integrity, power design - Firmware: C/C++ for ESP32 (including audio output), STM32, RTOS, drivers, Embedded Linux (Raspberry Pi, Odroid) - Connectivity: BLE, MQTT, HTTP/REST APIs, IoT system integration - Additional: TouchGFX UI, Python automation, AI/CV applications, technical documentation I focus on clean architecture and maintainable code to ensure long-term reliability—not just prototypes. Whether you need hardware designed from scratch or firmware to bring it to life, I can support your full development cycle. Let's discuss your project. I'm available for independent work or remote team collaboration.

I am a professional embedded software engineer with more than 12 years of experience. My current areas of expertise are IoT Applications & Embedded Systems Design, including embedded hardware/software. 𝐌𝐘 𝐒𝐊𝐈𝐋𝐋𝐒: - Know about MCU: Nordic, Silicon Labs, AVR, PIC, ESP, TI CC32xx, ESP32, Qualcomm QCC51xx, etc. - Have experience in programming languages such as C/C++, C#, Java - Solid knowledge of standard interfaces such as I2C, SPI, UART, and CAN. - Have experience using debugging tools such as Segger Jlink, CAN bus analyzer, and Logic analyzer. - IoT devices with wireless connectivity such as LTE, CAT-M1, NB-IoT, LoRa/LoRaWAN, BLE, WIFI, NFC - Good experience in AWS Service, AWS IoT, AWS Shadow, and AWS Jobs. - Good experience in Battery Management Systems based on BQ products from TI. - Good experience with Audio Codec chips. - Experience with AI/ML on Edge Impulse with nRF Connect - True wireless earbuds, headsets and speakers, Bluetooth ® LE Audio standard from Qualcomm: QCC5141, QCC5171, QCC5181,... We have worked with wearable devices and medical devices: - ECG 1, 3, 12 leads with ADS1292, ADS1293, ADS1298 - EEG with ADS1299 - Body temperature with MAX302025, MAX30208 - PPG with MAX86178, MAX86178 - SPO2 with OB1203, MAX32664 sensor hub - Vital signal with AFE4950 - OTA firmware update via Bluetooth/WIFI End-to-End Embedded & Hardware Solutions I provide complete product development services — from concept and design through prototyping, firmware, and production — for IoT, wearables, medical, and consumer electronics. Hardware & PCB Design - Multi-layer PCB design for high-reliability, high-performance systems - High-speed design: USB 2.0, HDMI 2.0, DDR3/DDR4/LPDDR4, PCIe, NAND Flash, Ethernet (up to 10GBase-T1), PoE++ - Microcontrollers & SoMs: ARM Cortex-M3/M4 (STM32, ESP32, Nordic nRF52/53/91); custom boards for Raspberry Pi CM4, iMX8, Jetson Nano/Xavier/Orin, RK3588/3568, TI AM6254 - Power & analog: DC-DC (Flyback, Boost, Buck, LDO), BLDC/servo motor control, high-resolution ADC/DAC, audio circuits, and battery management (BMS) - DFM/DFA and EMC/EMI compliance, with certification support (CE, FCC, FDA-ready) - Tools: Altium Designer, KiCAD, Eagle, EasyEDA, OrCAD; SolidWorks and Inventor for 3D/enclosure design Firmware & Connectivity - Embedded software in C, C++, Python, and Qt, with RTOS integration and low-power optimization - Custom driver development and communication protocols: QSPI, I2C, SPI, RS485/RS232, CAN, Modbus (TCP/IP/RTU) - Connectivity stacks: BLE, Wi-Fi, NFC, LoRa/LoRaWAN, LTE, CAT-M1, NB-IoT, GSM (3G/4G) IoT platforms: MQTT, ThingsBoard, AWS IoT, Blynk; secure OTA updates, device provisioning, and cloud integration - Robotics: ROS/ROS2 for AGV, AMR, and 6-axis robot applications - Embedded UI/UX: Figma, TouchGFX, LVGL AI & Cloud Integration - Edge AI/ML deployment (Edge Impulse, TensorFlow Lite) - Predictive maintenance and anomaly detection for IoT/IIoT - Cloud integration with AWS, Azure, and Google Cloud - Cross-platform mobile apps (Android/iOS) and web dashboards for monitoring and analytics Product Leadership - Proven experience leading cross-functional teams in startup environments - End-to-end project management across design, fabrication, and procurement for cost-efficient, on-time delivery - Strong troubleshooting and research skills for electrical evaluation, testing, and design optimization 🔑𝐊𝐄𝐘𝐖𝐎𝐑𝐃𝐒: Embedded Design, Hardware Design, Firmware Development, Mobile App Integration, IoT Device, Medical Device Design, Embedded Systems, Real-time Operating Systems (RTOS), Microcontroller Programming, Sensor Integration, Wireless Communication (Bluetooth, Wi-Fi), Low Power Design, Wearable Devices, Firmware Architecture, Embedded Software, Device Drivers, System-on-Chip (SoC), PCB Design, Signal Processing, IoT Platforms, Cloud Integration, Mobile App Development, Web Portal Design, Healthcare Technology, Remote Monitoring, Data Security, Telemetry, ARM Cortex, ESP32, Device Connectivity, Embedded Prototyping, Human-Machine Interface (HMI), Medical Device Compliance, Mobile-Connected Devices, IoT Security, BLE, Firmware Debugging, Connectivity Solutions, Edge Computing, Smart Devices, Industrial IoT.

I am looking for online job with some content below: 1. Schematic/PCB design - I have 5 years experience in PCB layout - I can do PCB design for a board from 2 to 26 layer, standard board/ ceramic board/ flex board. - I can make footprint for PCB - I can develop allegro/kicad/altium skill - ***Software: I am using Allegro, Altium, Kicad, Easy EDA to design.... 2. Software developer: - I can develop some microcontroller such as: STM8/STM32, AVR, Arduino, 8051 (Nuvoton), ESP8266, ESP32... - ***Software/Compiler: SDCC, KeilC, CCS, Atmel Studio, gcc, Arduino 3. 3D model - I can build 3D model for PCB footprint, pcb board, enclosure.... assembly board and enclosure - ***Software: Solidwork, AutoCAD *** my github link (still building up) github.com/Vanbatai123 Don't hesitate to contact me, we can discuss to meet your need.

Greetings ! I’m a Senior Embedded Linux and Firmware Specialist with over 15 years of experience in developing robust and efficient firmware solutions. My expertise spans across various programming languages including C/C++, C#, Java, and Python. I have a proven track record of delivering high-quality embedded systems and firmware for a wide range of applications Key Skills and Expertise : 1) Embedded Systems Development : ✔MCU Firmwares : STM32 family, PIC18F, Atmega family, 8051 families, MSP430 - Arduino UNO, Arduino Mega2560, ESP32/8266. ✔ Linux-Embedded: Raspberry Pi, Beaglebone, Orange PI, Banana Pi,. ✔SDK Tools: Keil, IAR, Atmel Studio, QT IDE, Arduino, Visual Studio. ✔Communication Protocol: Bluetooth 5, Wifi, Zigbee, Lora Worked with nRF-51DK, core nRF51822, beaconkit, NRF52832 dev-kit. - Adafruit BLE, CC2540/CC2541, CC3200, ESP8266/ESP32 - GSM SIM800 SIM900 GPS MODBUS (TCP/IP) (RTU) ,CANBUS ✔ Build Yockto Linux integrate with Qt5 for Raspberry ✔ Customize the AOSP images 2) IoT Application Development Some of my product that I have designed and released to the market: ✔ Home application: Design Air-condition use Toshiba IC, control motor BLDC, have FPC to 7A, 380V, power supply 1000W, temperature resistor sensor, WIFI and IR to control AC Fan by Triac… ✔ Smart Home Product: Design Home Gateway with Ethernet, WIFI , Zigbee and TFT LCD. Design Smart Switch with capacitive touch, Zigbee communication, Single Phase Power Meter, 220VAC/110VAC load control,... and a lot of other products . 3) Mobile Application development ✔Define an interface where you can send and receive data via Bluetooth, WIFI ✔Make a graph which plot data, design database where store the IoT data ✔Design base on MVVM, MVP, Clean Architecture 4) Build-In Desktop Application ✔ Develop desktop application by WPF, Winform using the MVVM pattern, clean architecture ✔Help you solve any problem in the project. ✔ Build GUI app for Mac, Linux, Win by PySide, Python 5) Web Application Development ✔ Consult that make your business successful with my expertise and knowledge ✔Good at the framework: Spring Boot, .NET core, Django, ReactJS - Configuring and administrating CI (Continuous Integration) & CD (Continuous Delivery) tools/utilities to support in deploying 6) Do data entry, data mining, web scraping, and data extraction ✔ Write a custom script for the website that will extract the required data without relying on any specific software ✔ Make scraping tool that performs web crawling, deliver qualified & well-organized databases as your needs (XLSX, CSV, TXT, IMG, XML, JSON) I am dedicated to delivering top-notch solutions that meet and exceed client expectations. My strong technical skills, combined with my commitment to quality and timely delivery, make me the ideal choice for your embedded systems and firmware development needs. Let’s work together to bring your project to life!