Welcome! I am Kiran, PCB Designer & Embedded Firmware Developer with 15+ years of experience, 20+ products shipped from concept to mass manufacturing across industrial, automotive, medical, IoT, and consumer electronics. 100% Job Success Score, Top Rated Plus. MTech (E&TC), Symbiosis International University | BEng (Electronic Engineering), Shivaji University. Most hardware projects fail due to poor EMI/EMC compliance, memory leaks, or unoptimized DFM/DFT. I solve this by engineering robust ecosystems & bridging the gap between reliable hardware physics and memory-optimized RTOS firmware. 📌 Hardware Architecture & PCB Design As a Senior PCB Designer, I natively use KiCad (versions 8–10) and Altium Designer to engineer multi-layer, high-speed, and mixed-signal boards. I handle the complete hardware lifecycle, integrating critical protections like 12V automotive TVS surge clamping, reverse polarity protection, and complex EMI/EMC shielding. Whether you need a flex-PCB for a medical wearable or a rigid board for an industrial controller, my layouts guarantee strict IPC-2221 compliance and flawless Pick-and-Place (CPL) alignment for JLCPCB and mass assembly. 📌 Embedded Firmware & RTOS Development As a Firmware Engineer, I write secure, hardware-optimized Embedded C/C++ code for ARM Cortex-M (STM32, NXP), ESP32, and nRF52 microcontrollers, as well as Embedded Linux systems (Raspberry Pi, Yocto, Debian). I architect highly stable software using FreeRTOS and Zephyr RTOS. My firmware track record includes deploying secure dual-bank OTA (Over-The-Air) updates, integrating Edge AI (TinyML), and tuning real-time wireless stacks (BLE, Wi-Fi, LoRaWAN, Cellular NB-IoT) without ever bottlenecking the scheduler. 📌 Industrial IoT & Sensor Integration I seamlessly integrate high-precision components—IMUs, CMOS image sensors, biopotentials, load cells, and BLDC/Stepper motor drivers—into highly constrained physical envelopes. I ensure that industrial communication interfaces like SPI, I2C, CAN bus (SAE-J1939), RS485, and Modbus TCP operate synchronously and fault-free. Core Services & Deliverables: 📌 End-to-End Hardware Architecture & Schematic Design 📌 PCB Layout & Routing (KiCad, Altium, EasyEDA) 📌 DFM/DFT Optimization for Mass Manufacturing (PCBA) 📌 Embedded C/C++ Firmware (FreeRTOS, Zephyr, ESP-IDF) 📌 Embedded Linux & Audio DSP (ALSA, PipeWire) 📌 IoT Cloud Connectivity (MQTT, AWS IoT, HTTPS) 📌 Hardware Bring-Up, Debugging & Power Supply Design Why Work With Me? I respect your intellectual property (IP) and strictly safeguard your hardware designs, schematics, and source code. I communicate transparently and deliver on time. Ready to start? Click "Invite to Job", book a Consultation on my profile, or send me a message detailing your product vision, physical constraints, or current hardware bugs. I will respond within 4 hours with an initial technical assessment and approach.

I have extensive experience in embedded Linux and IoT systems, specializing in customizing and optimizing Linux platforms for ARM and x86 architectures. My expertise covers kernel configuration, driver development, and seamless hardware-software integration. I also design and deploy industrial IoT solutions using Node-RED, enabling intelligent data flow and system automation. Skilled in industrial communication protocols such as PROFINET, OPC UA, Modbus, EIP and EtherCAT, I bridge embedded systems with industrial networks to deliver robust, scalable, and connected automation solutions.

I am a Embedded linux developer, Linux/ARM BSP/firmware engineer (6+ years). Experience and skills: ● 6 years of experience in Embedded systems and Home automation. ● Employed Full-time as Embedded linux Engineer ●Having experience with programming in C/C++, Java, and basic in Python, as well as many other languages. ● SVN, GIT, GIT Shell, Tortoise SVN, Tortoise GIT, Source Tree, Gerrit Code Revie, Jenkins... ● Working with various SoC's and microcontrollers : (TI: cc2530, cc2531, cc2538; Atmel: AtMega328p, AtMega8, ATtiny85; Arduino: Mini, Nano, Uno...; ESP8266, ESP32; Raspberry pi 2/3/4), Beaglebone, i.MX6 Sabre, Quectel AG35 EVB, NanoPi Air, OrangePi Win, STM32, Microchip SAM9X60-EK. ◉ Have solid knowledge of the standard interface such as I2C, SPI, UART, CAN, OCPP1.6 ,OCPP2.0,RS232, USB Host/Device, Ethernet, SDCard ◉ IoT devices with wireless connectivity such as LTE, BLE, WIFI, GPS. ◉ Solid experience with U-boot porting, BSP, Linux kernel, Device drivers development/optimization for the small Linux SoC boards. ◉ Yocto, OpenWRT, Buildroot ◉ OTA: swupdate, mender, rauc ◉ Chipset: Allwinner A64, Allwinner H3, NXP i.MX6, Quectel AG35, Qualcomm MDM9x07

Senior embedded firmware engineer. 10+ years, 100% Job Success across 25 contracts, specializing in BLE, motor control, and industrial firmware on STM32, Nordic nRF52, ESP32, PIC, and TI MSP430. Clients hire me when the firmware decisions matter — when a wrong choice on BLE connection parameters costs weeks of battery life, when a motor control loop needs to be stable across temperature, or when an OTA update has to work on every device already in the field. Shipped products my firmware runs in: — Range React VRT — commercial shooting-sports trainer on ESP32 (see portfolio): shot detection, servo-positioned laser, BLE streaming to iOS/Android — Production BLE tire-pressure monitor on nRF52832 (nRF5 SDK/SoftDevice) — pressure + IMU over I²C, low-power BLE streaming — Commercial smart lock rebuilt from TI CC2640 onto nRF52 — BLE + NFC, plus a custom OTA/DFU host: when Nordic's DFU controller docs fell short, I reverse-engineered the protocol from live BLE logs and reimplemented it on ESP32 — STM32WB55 dual-BLDC controller — closed-loop PID with encoder feedback, live tuning over Web Bluetooth — 10-zone fire alarm panel on PIC18F/XC8 — the client still returns with new requirements every time he lands a customer — USB HID input device on PIC16F1455 — 3-switch keyboard HID (F13–F15) + rotary encoder volume/mute control for Windows (see portfolio) — Register-level i.MX RT1062 (Teensy): 8 phase-synchronized FlexPWM outputs via XBAR, no vendor SDK Beyond the above: Wi-Fi, RFID/NFC, custom GATT profiles, multi-peripheral BLE architectures, ADC tuning and sensor bring-up, interrupt-driven design, and clean firmware porting between MCU families. Currently also working in nRF Connect SDK / Zephyr. Hardware-level debugging with oscilloscope and logic analyzer — when the datasheet and reality disagree, I find out which one is lying. On one contract, the transmitter didn't actually follow its own protocol spec — the scope proved it, and I adapted the receiver to the real signal instead of the document. Most of my contracts start small and grow — my work history shows client relationships lasting 3–5 years and 200+ hours. I also work daily as an ATC automation engineer under ICAO standards — including network protocol analysis with Wireshark on live operational systems. That background shapes how I write firmware: defensive coding, fault tolerance, watchdog discipline, and the assumption that field conditions will eventually find every weakness in the design. For safety-adjacent, industrial, or always-on products, it matters. Toolchains: Keil uVision5, SEGGER Embedded Studio, STM32CubeIDE, MPLAB X, Code Composer Studio, Arduino IDE, XC8, Proteus. If you have hardware in hand and need firmware that ships correctly the first time, send me the details — happy to discuss scope before you commit. Keywords: nRF52832, nRF52840, SoftDevice, BLE GATT, Secure DFU, OTA firmware update, BLDC, PID, Teensy, i.MX RT1062, FlexPWM, PIC18F, PIC16F1455, USB HID, XC8, STM32WB55, Web Bluetooth, sensor integration, IMU, I2C, low power, logic analyzer, oscilloscope debugging, protocol analysis, Wireshark, wearable firmware, IoT firmware

Most hardware projects don't fail because of bad ideas. They fail in the messy space between "working prototype" and "shipping product." That's where I've spent the last 14 years — across 350+ projects and 50+ products now in mass production. Hundred clients have come back for a second project. Here's what's behind that number. I take products from napkin sketch to factory floor — designing the PCBs, writing the firmware, and optimizing the BOMs. That DFM work alone typically saves clients 20–30% on production costs. One client shipped at 12mA after coming to me with a prototype drawing 800mA in sleep mode. That's the difference between a redesign and a launch. The firmware I write runs 24/7 in industrial environments where a crash at 2 AM means someone's driving to a job site. I build for reliability first: FreeRTOS or bare-metal on STM32, ESP32, nRF52/53, RP2040, PIC, and Atmel. Connectivity — MQTT, BLE, Wi-Fi, LoRa, or cellular — gets chosen for the use case, not the trend. On the hardware side: multi-layer PCBs, proper signal integrity, IPC-compliant layouts (2221, 7351) in Altium and KiCad, built for manufacturability from day one. When the project calls for it, I wire the full IoT stack — AWS IoT Core, edge AI/ML inference, secure OTA, and fleet health monitoring. Top-Rated Plus. 100% Job Success Score. If you need an engineer who thinks in yield rates, field reliability, and unit economics — hit "Message" or "Invite to Job." Let's get your product out the door.

I am a hardware engineer with 10+ years of experience designing and bringing up complex embedded systems from technical specification and architecture to PCB design, validation, and production support. What I do: Design microcontroller- and microprocessor-based hardware for industrial, IoT, automotive-adjacent, and communication devices Own the full hardware cycle: component selection, schematics, PCB, bring-up, validation Work closely with embedded software teams on hardware–software integration Hardware & PCB Multilayer PCB design (up to 12 layers, controlled impedance, mixed-signal up to ~1 GHz) High-speed interfaces: USB 2.0 / 3.2, PCIe, Ethernet, SATA, HDMI, LPDDR4 DDR4 signal integrity modeling and timing analysis using Cadence Sigrity Power electronics: DC/DC, LDOs, power sequencing, thermal considerations EMC pre-compliance and debugging (including BCI testing) Embedded & Systems Platforms: STM32, ESP32, AVR, i.MX6, Raspberry Pi Firmware support: C, HAL, FreeRTOS, board bring-up, low-level debugging Embedded Linux systems and gateway-class devices Interfaces: SPI, I2C, UART, USB, SDIO, RS-232/485, Ethernet, PCIe Advanced & Domain Experience FPGA-assisted systems and hardware accelerator applications Automotive-grade hardware validation, DFMEA / FTA / FMEDA (Medini) Medical-related electronics (PPG, ECG, EMG) Industrial automation, IoT, telecom-related projects Tools & Bring-up Altium Designer, OrCAD / Allegro, SolidWorks, Git Professional lab equipment: oscilloscope, logic analyzer, signal generator Prototype assembly, rework, and debugging If you need an engineer who can design hardware, bring it up, debug real problems, and deliver a working prototype - I can help.

I help companies transform embedded product ideas into reliable, production-ready devices. I'm a Principal Embedded Software Engineer with 20+ years of experience developing commercial embedded systems from concept through manufacturing. I work across the entire product lifecycle—from system architecture and firmware development to hardware bring-up, production testing, and manufacturing support. My background combines deep low-level firmware expertise with practical product development. Earlier in my career, I spent more than 10 years developing RTOS components, networking stacks, USB stacks, bootloaders, device drivers, and low-level embedded software. This foundation allows me to quickly understand complex systems, identify root causes, and design robust solutions. I don't just write firmware—I help build complete embedded products. Core Expertise Embedded C/C++ System & Firmware Architecture Embedded Linux FreeRTOS Zephyr RTOS Bootloaders OTA Firmware Updates Secure Firmware Architecture Low-Power Design Digital Signal Processing Industrial IoT MCU Platforms STM32 ESP32 Nordic nRF52 / STM32WB NXP Renesas TI MSP430 Microchip PIC / dsPIC ARM Cortex-M / Cortex-A Embedded Linux platforms Wireless & Connectivity Bluetooth Low Energy (BLE) LoRa & LoRaWAN Wi-Fi NFC GSM / GPRS LTE-M / NB-IoT GPS / GNSS Satellite Communications MQTT HTTP / HTTPS TCP/IP Areas I Can Help With Embedded firmware development Product architecture Hardware/Firmware co-design Communication protocol design Bootloader development OTA update systems BLE applications LoRa & LoRaWAN devices NFC & Secure Elements Embedded Linux Production programming Manufacturing test systems Hardware bring-up Performance optimization Power optimization Technical consulting Hardware Experience I regularly work with electrical schematics, hardware debugging, prototype bring-up, and production validation. I also collaborate with PCB designers to move products efficiently from concept to manufacturing. Engineering Tools Besides firmware development, I build engineering tools that simplify development and production: Python desktop applications Manufacturing software Production programming tools BLE diagnostic applications NFC validation tools Firmware update utilities Automated test frameworks Recent Commercial Projects BLE-enabled IoT devices LoRa & LoRaWAN industrial monitoring systems Secure NFC and authentication systems Satellite communication modem Smart beverage dispensing platform Automotive embedded systems Cellular IoT gateways Industrial controllers Secure OTA firmware update systems If you're looking for someone who can take an embedded product from an initial idea to a reliable production-ready solution, I'd be happy to discuss your project.

As a recent graduate with a Bachelor's degree in Communication and Electronics Engineering, I am a passionate and highly motivated professional who has cultivated a strong foundation in the field of embedded systems. I am available to help you translate your ideas into professional projects.

👋 Hello, I am YanXia Xu. Embedded Systems Engineer with nearly 30 years of experience in industrial automation and embedded firmware development. Specialized in MCU firmware, RTOS-based systems, industrial communication protocols, and embedded Linux platforms. Extensive experience supporting Japanese enterprise projects and long-term industrial product maintenance. Strong background in debugging, hardware-software integration, and reliable embedded system design.

P R O F E S S I O N A L S U M M A R Y Results-driven Electronics Engineer with 14+ years of experience in Embedded Systems, Internet of Things (IOT) and High-Speed PCB Design. Proven expertise in end-to-end product development, from concept to mass production, with a strong focus on reliability, integrity, efficiency, and security. Adept at Agile workflows, crossfunctional collaboration, and managing engineering teams. Electronic System Design : Designed and developed advanced electronic systems for cash-handling machines, including power, sensors and data distribution and processing boards, leveraging STM32 microcontrollers, iMX8 MPUs, Raspberry Pi Compute Module CM4. Customized single board computers and carrier boards are designed with iMX8M and CM4 using DDR3L, HDMI, PCIE Gen 3, USB 3.0, CAN, Ethernet etc. Altium Designer is used for PCB designing. Hyperlynx SI & PI suits are used for signal integrity and power integirty of pcb boards. Efficient pcb stackups are designed for high speed and mixed signal boards. Power Distribution & Safety : Engineered efficient, reliable, and safe DC power distribution boards for various products, ensuring compliance with industry standards IPC-2221 and IPC-2152. EMI Mitigation & Signal Integrity : Implemented EMI noise suppression techniques using optimized PCB stack-ups and advanced filtering methods. Hardware Testing & Debugging : Conducted rigorous hardware testing and debugging to ensure optimal performance, reliability and functional compliance using test jigs, power loads, multimeters, oscilloscopes and logic analyzers. DFM, DFT & DFA Analysis : Performed Design for Manufacturing (DFM), Design for Testability (DFT), and Design for Assembly (DFA) analysis to streamline mass production. Version Control & Collaboration : Managed version control in hardware design using Git and Altium 365, ensuring efficient collaboration with team and design traceability. Firmware Development & Debugging : Developed and maintained secured firmware across the entire product line including secure OTA, STLink and JTAG are used for in-depth debugging and code optimization. Version control using Git and bitbucket for code management and maintenance. STM32Cube IDE is used as development framework environment. Secure Boot & Encryption : Implemented secure booting and encryption in firmware using STM32 Encryption SDK, integrating hardware encryption chips for enhanced security. AES is used for hashing and RSA for enhanced encryption. Procurement & Component Sourcing : Led component sourcing and procurement efforts for next-generation hardware products, ensuring supply chain efficiency and cost-effectiveness. Remote OTA Updates & Custom Bootloaders : Developed remote over-the-air (OTA) update mechanisms and custom bootloaders to enhance device maintainability and security. Custom Communication Protocols: Engineered proprietary communication protocols using Protocol Buffers and JSON for nextgeneration product integration and scalability. Agile Development & Project Management : Experienced in Agile workflows, utilizing Jira for tracking daily and biweekly tasks across multiple concurrent projects.