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Embeedded Firmware Engineer expert in MCU/MPU, Zephyr RTOS & Embedded Linux (Yocto). Specialized in secure fintech/IoT. I offer Hardware-Aware dev with schematic audits & lab-tested code for production-grade reliability. I don't just write code; I ensure your hardware is safe, scalable, and field-ready. Why Choose Me? 🏆Award-Winning Impact: Won "Best Newcomer Award" at PARKEE for delivering a full in-house terminal solution. 🚀 Proven Scale: Engineered systems serving 21,000+ gate entries across nationwide networks. 🛡️ Security Expert: Deep expertise in TLS 1.3, ISO7816, EMV, and bank-grade cryptography. ⚡Full-Stack Proficiency: Skilled in C/C++, Python, and React JS for end-to-end IoT dashboards. 💰 Cost Efficient: Reduced costs by shifting from third-party hardware to custom in-house firmware. 💬 Fast Response: Experienced in collaborative environments across hardware, QA, and backend teams. What I Can Do & Timelines 1. Low-Level Driver & Peripheral Integration 🔌 Custom Driver Development: Writing high-performance drivers for sensors (I2C/SPI), displays, and specialized ICs (e.g., NXP PN5180). (~1-2 Weeks) 🔋 Power Management: Optimizing battery life through deep-sleep cycles and efficient interrupt handling. (~1 Week) 2. Embedded OS & System Architecture 🐧 Custom Embedded Linux: Tailoring lightweight, secure Linux distributions using Yocto Project or Buildroot for industrial MPUs. (~2-4 Weeks) ⚙️ RTOS Implementation: Building stable multitasking systems using Zephyr RTOS or FreeRTOS for mission-critical applications. (~2-3 Weeks) 3. IoT Connectivity & Industrial Hubs 🌐 Industrial Gateways: Integrating MQTT, Modbus TCP/RTU, and CAN bus for real-time factory monitoring and automation. (~2-3 Weeks) 📡 Wireless Stacks: Implementing BLE, Wi-Fi, and Cellular connectivity for remote device control. (~1-2 Weeks) 4. Secure Payments & Fintech (Specialized) 🔐 Payment Terminal Logic: Full implementation of ISO7816, EMV, and NFC (Mifare/Felica) for secure access or payment hardware. (~3-5 Weeks) 🛡️ Secure Boot & OTA: Designing encrypted Over-The-Air update pipelines to keep your devices safe in the field. (~2-3 Weeks) 🛠️ Tech Stack & Tools ⚙️ Frameworks:** Zephyr OS , FreeRTOS , Yocto Project , ESP-IDF , Arduino IDE. 🔌 Hardware: STM32 , ESP32 , Raspberry Pi , BeagleBone , NXP. 📡 Protocols: MQTT , Modbus RTU/TCP , CAN bus , SPI , I2C , USB CDC , ISO7816. 💻 Tools:** Altium Designer , Git/GitHub , Docker, Logic Analyzers. Feel free to reach out to discuss your project requirements and explore how i can help you achieve your goals. Keywords Embedded Firmware Engineer, Zephyr RTOS, Embedded Linux, Yocto Project, NFC Specialist, IoT Architecture, STM32 Developer, ESP32 Firmware, Fintech Security, Hardware-Software Co-Design, C/C++ Expert, Industrial IoT, Secure Payment Terminals, Modbus/CANbus, RTOS Specialist.

Skilled RF engineer with over 9 years of experience in designing, testing, and troubleshooting RF & Antennas systems. - Designed RF circuits and systems for various applications using simulation tools like ADS, and CST. - Designed and optimized antennas for various applications including S-Band Systems, L-Band Systems, LoRa Module on 915 MHz, 2.4 GHz wireless Systems - Designed and tested PCB layouts for RF circuits and systems. - Debugged RF issues in lab and field environments and provided solutions to improve performance. - Collaborated with cross-functional teams including hardware engineers, software engineers, and product managers to deliver high-quality products on schedule. - Conducted feasibility studies, simulations, and prototype testing to validate new product concepts. - Developed test plans and procedures to ensure products meet performance and regulatory requirements. - Provided technical support to customers and resolved product-related issues. Skills : - RF System Design - Antenna Design - PCB Design : High Speed PCB Design, RF PCB Design - RF Debugging : VNA, Spectrum Analyzer, Oscilloscope - Simulation Tools : Matlab, ADS, CST - Design Tools : Altium - Wireless Communication Systems : LoRa Systems, WIFI systems, Telemetry Systems, Radar Systems, GPS/GNSS - Cross-functional Collaboration - Test Plan Development - Technical Support Delivered Products : - Power Divider/Combiner : L-Band, S-Band - S-Band Receiver Channel : that consist of : LNA, BPF, Digital Step Attenuator, power detector, High Power Limiter - L- Band Receiver Channel : that consist of : LNA, BPF, Mixer, Log Amp - Patch Antenna Design : Conformal antenna, 2x2 antenna on freq 8 GHz, - Dipole Antenna Design : 3 GHz Antenna Design. - Waveguide Antenna Design - and various design that meet client needs Sometimes do Consultation for RF Circuit, Antennas, RF Things

It has been around 15 YEARS for me working on mobile robots, e-VTOL UAV (drones), RF-based sensing (i.e., UWB and FMCW RADAR), IoT, and embedded systems in general. ☑In Upwork, I have helped prototype various projects on IoT and embedded systems, like: ✅ IoT Dairy Farm, ✅ IoT Breast Pump, ✅ Automatic hydroponics, ✅ Vending Machine, ✅ Mobile Robots, ✅ Biosensor ✅ Smart IoT box ✅ Smart Display (LED, LCD, addressable RGB strip) ✅ Micro/active/passive buzzers ☑I'm familiar with various hardware including: ✅ Various Arduino boards, ✅ SBCs (Raspberry Pi, Banana Pi, Latte Panda, Odroid, Onion, etc), ✅ Edge devices (Jetson Orin, Rockchip) ✅ STM32, ✅ AVR (ATMEGA, ATXMEGA), ✅ ARM Cortex, ✅ ESP32/ESP8266, ✅ Nordic nRF52 (e.g. nRF52840), CC2650 ✅ SDR/USRP, ✅ TI mmWave Radar (e.g. AWR2243, IWR6843AOP). ☑I'm fluent with various IDEs such as: ✅ ArduinoIDE, ✅PlatformIO/VSCode, ✅STM32CubeIDE, ✅Keil IDE, and programming languages like ✅C/C++, ✅Python, and ✅Matlab. ☑ My main expertise is: ✅ PCB design (high-speed, Flexible, Rigid-Flex, multi-layer) ✅ firmware programming. ☑ I'm also familiar with AWS cloud services: ✅IoT core AWS ✅S3 ✅Lambda ✅MQTT/HTTP API ✅REST API Gateway ☑ Lastly, I have done various AI/machine learning projects where I'm familiar with: ✅Keras ✅TensorFlow ✅PyTorch.

I am a senior PCB & Firmware engineer and computer scientist with over 8 years of experience in the hardware design, embedded systems development and software development for robotics and IoT applications. I have a deep expertise in PCB design, real-time firmware development (bare-metal & FreeRTOS & Zephyr RTOS etc) and Linux based firmware development. I have worked for various robotics projects such as multi-rotor and fixed-wing UAVs and mobile UGVs related to embedded systems development. And also I have rich experience in Internet of Things and worked with various projects such as medical healthcare systems for over 5 years. Furthermore, my expertise includes some software development and DevOps engineering necessary for IoT applications. 🌺 Core Skills & Expertise: 💭 Electronics & PCB Design💭 🍀 Schematics & Multi-layer PCB layout and design for high-speed, mixed-signal, power electronics and RF systems 🍀 EMC/EMI compliant designs for robotics and IoT applications 💭 Embedded Firmware Development 🍀 Bare-metal and RTOS-based firmware for ARM Cortex-M, AVR, STM32, TI, nRF52 & nRF53, Microchip MCUs and FPGAs 🍀 Firmware architecture for sensor fusion, motor control, and communication protocols (I2C, SPI, UART, CAN 2.0/CANOpen, USB, Ethernet, Bluetooth/BLE, WiFi, LoRa, LTE, RFID) 🍀 Real-time embedded C/C++ with low-level driver development and bootloader implementation 🍀 Embedded Linux with Build-Root, Yocto, OpenWRT 💭 IoT software Development & DevOps Engineering 🍀 IoT Dashboard Development using Thingsboard, Node-RED, Tago.io 🍀 IoT Backend Development using Node.js framework 🍀 IoT Architecture Design & AWS & Chirpstack & MQTT/MQTT-SN/HTTP 💭 Robotics & Autonomy 🍀 Autonomous ground/aerial robot system design (ROS/ROS2, PX4, ArduPilot) 🍀 Sensor integration (LIDAR, GPS, magnetometers, cameras) and real-time perception 💭 Tools & Technologies: 🍀 Hardware/PCB: Altium Designer, KiCAD, OrCAD, LTspice, Oscilloscopes, Logic Analyzers 🍀 Firmware/Software: C, C++, Python, Embedded Linux, FreeRTOS, STM32Cube, PlatformIO, Zephy RTOS, ESP-IDF, JavaScript, VHDL/Verilog HDL 🍀 Protocols/Interfaces: I2C, SPI, UART, CAN, RS485, USB, TCP/IP, MODBUS, Bluetooth/BLE, WiFi, LoRa, RFID, MQTT/MQTT-SN I would like to take part in much more interesting projects & jobs, advance me in a higher level and make our life more intelligent and amazing. If you have any creative & exciting & valuable projects, please contact me at any time. I will do my best and we will be in the same page. Regards, Viona