Muhammad R.

If you're looking for a Senior Embedded System & IoT Engineer with experience in Embedded Firmware Development, Multi-Layer PCB design, and IoT Web and Mobile control systems, I'm here to design and built your idea into fully-functional IoT Product, from concept to MVP to Production. I've developed and deployed 20+ production embedded & IoT products across healthcare, agriculture, wearables, security, automotive, and industrial devices. As a Senior Embedded Systems Engineer with a background in Electrical Engineering, I help startups, entrepreneurs, and engineering teams design, develop, and launch connected products and stay accountable for the result from the first schematic to the production line. 𝐖𝐇𝐀𝐓 𝐈 𝐎𝐅𝐅𝐄𝐑: ➛ Firmware Development: Secure, optimized C/C++ firmware for various Microcontrollers and SBCs. ➛ Hardware Development & Integration: Multi-layer PCB designs in Altium/KiCad with driver integration. ➛ Enclosure Design: 3D-printable prototypes through production-ready CAD. ➛ IoT Web & Mobile Dashboards + Cloud Integration: Web dashboards and mobile apps integrated with BLE/Wi-Fi/LoRa IoT devices. 𝐏𝐑𝐎𝐃𝐔𝐂𝐓𝐒 𝐈'𝐕𝐄 𝐒𝐇𝐈𝐏𝐏𝐄𝐃 • Frostmed: Vaccine Transport Cooler (ESP32) - safe transit with live temperature visibility. Mass production. • SmartBolt: Smart Door Lock (nRF52840) - NFC tap-to-unlock, BLE app control, months on one battery. • Palm: Smart Thermal Waste Bin (ESP32) - Firmware, PCB, App & cloud fleet management. • NAPL: Groundwater Oil Filtration System (ESP32) - extracts oil from contaminated sites, solar-powered, unattended. • LoRaWAN Smart Call Device: emergency call button that works where cellular and Wi-Fi don't. 𝐓𝐄𝐂𝐇𝐍𝐈𝐂𝐀𝐋 𝐄𝐗𝐏𝐄𝐑𝐓𝐈𝐒𝐄: • MCUs & SBCs: ESP32, nRF51/52/53/91, STM32, PIC, Raspberry Pi, Jetson Nano, Linux-based edge devices • Real-Time Operating Systems: FreeRTOS, Zephyr for deterministic, multi-threaded applications • ARM Processors & SoCs: Cortex-M & Cortex-A - bare-metal & RTOS firmware, Linux kernel porting, board support and driver development • Programming Languages: C, Embedded C, C++, MicroPython, Python, TinyML, Shell scripting, TCL • PCB Design: Altium Designer, KiCad, EasyEDA - schematic capture, multi-layer layout, high-speed design, 3D modeling, and prototyping • Networking & Communication Protocols: UART, SPI, I2C, CAN, Modbus, RS-485, BLE, MQTT, LoRaWAN, LoRa, HTTP/HTTPS, TCP/IP, WebSockets for sensor networks and cloud/device communication • Driver Development: Custom low-level drivers for GPIO, ADC, DAC, PWM, Timers, RTC, AC metering ICs, Watchdog, DMA, and memory-mapped IO • Sensor Integration: Environmental (BME280, SHT31), IMU/Motion (MPU6050, BMA400, ADXL345), Biosignals (ECG/bioimpedance, heart rate), Power Monitoring (INA219, ACS712), GPS/GNSS (u-blox), Time-of-Flight, Hall Effect • Cellular & GNSS Modules: SIM7600X (4G LTE), SIM800/900 series, Quectel, u-blox - AT command stacks, GNSS parsing, SMS/Call/HTTP, and fallback logic • Display & HMI: TFT (ILI9341, ST7789), OLED (SSD1306), E-Ink, Addressable LEDs (WS2812B, SK6812 RGBW) - LVGL, Qt, SquareLine Studio • IoT Web Dashboard & Mobile App Development: Flutter-based and custom web/mobile dashboards for remote monitoring and data sharing across devices • IoT Platforms & Cloud Services: AWS IoT Core, Azure IoT Hub, ThingsBoard, Blynk, EMQX, Mosquitto • Embedded Toolchains & IDEs: PlatformIO, ESP-IDF, STM32CubeIDE, nRF Connect SDK, VS Code - version control with Git & GitHub • Security & Updates: TLS/SSL, AES-encrypted OTA with rollback, secure bootloaders, CRC integrity 𝐔𝐒𝐄 𝐂𝐀𝐒𝐄𝐒 𝐈 𝐒𝐏𝐄𝐂𝐈𝐀𝐋𝐈𝐙𝐄 𝐈𝐍: 🔹 Medical & Consumer Devices: wearables, health monitors, smart appliances 🔹 Industrial Automation: sensor/actuator control, live system monitoring 🔹 Smart Agriculture: environmental sensing, LoRa field networks 🔹 Automotive & Energy: CAN systems, GPS tracking, smart metering, BMS 🔹 IoT Connectivity: secure cloud gateways, OTA update pipelines 🔹 Prototyping: POC development, research kits, lab platforms 𝐖𝐇𝐘 𝐖𝐎𝐑𝐊 𝐖𝐈𝐓𝐇 𝐌𝐄? ➛ Proven production experience - shipped products, not just prototypes. ➛ Milestone-driven development with clear planning and documentation. ➛ You own everything: schematics, firmware repo, Gerbers, STEP files. ➛ Straight answers - I flag requirements that will bite you at certification or manufacturing before you pay for them. ➛ Available post-launch for scaling, upgrades, and long-term support. Send me your product idea, spec, or half-finished prototype, and I'll reply with a concrete assessment of what it takes to ship it.