Christoph H.

Senior Solution Architect with 35+ years of hands-on engineering experience. I develop complex connected products from embedded hardware and firmware to applications and IoT / cloud, from first concept to reliable mass production. I also rescue difficult or failing projects when architectures have gone wrong and hardware, firmware and software teams can no longer identify the root cause. ✅ Top Rated Plus | 100% Job Success | $190k+ earned on Upwork | Multiple Granted Patents✅ My strength is designing and debugging across technology boundaries – from analog signals and ADC acquisition through MCU firmware and communication protocols to applications and cloud systems. I engineer for real-world edge cases: communication, power failures, secure firmware updates, recovery, remote diagnostics, test automation, security, maintainability & production constraints. WHAT I CAN HELP YOU WITH • Idea → Prototype → Production – requirements, architecture, rapid prototyping, engineering, validation, DFM & manufacturing • Embedded Systems & IoT Architecture – system design, technology selection, technical review and end-to-end architecture • Product Rescue & Troubleshooting – root-cause analysis across hardware, firmware, connectivity, software and cloud • Firmware Development – Embedded C/C++, bare metal, real-time, Zephyr, FreeRTOS, HAL/BSP, drivers, bootloaders, secure boot and secure OTA/FOTA • Analog & ADC Systems – analog front ends, ADC interfacing, signal conditioning, filtering, calibration, noise reduction and analog/digital signal processing • Audio Engineering & DSP – embedded audio, USB audio, ADC/DAC, analog and digital signal processing, filtering, low-noise design, audio interfaces and measurement • Microcontrollers – STM32, ESP32, Nordic nRF52/nRF91, NXP, TI, Microchip, Nuvoton, Cypress/Infineon, GD32, ELAN, Realtek, Weltrend, Holtek, Sonix and other ARM, 8051 and MIPS MCUs • Connectivity – DMA, CAN/CAN FD, USB/HID, BLE/Bluetooth, Wi-Fi, Ethernet, MQTT, LoRaWAN, LTE-M/NB-IoT, Thread, Matter, UART, SPI, I2C, RS485 , Modbus • Embedded Linux – Yocto, Buildroot, Linux kernel/device tree, U-Boot, Mender and edge gateways • IoT & Cloud – AWS IoT, Azure IoT, REST APIs, EEBUS, secure device communication, gateways, dashboards and device management • Full Stack Developer – C/C++, C#, Python, Java, Node.js, TypeScript, React, Angular, SQL/NoSQL • AI / LLM Integration – local LLMs, OpenAI, Anthropic and Gemini • Hardware & Production – schematic/PCB design, analog and mixed-signal electronics, component selection, BOM optimization, testing, tooling, manufacturing & production ramp-up DEEP EMBEDDED & HARDWARE EXPERIENCE I have worked across sensors, automotive, wireless products, industrial IoT, smart home, energy/HVAC, gateways, audio and consumer electronics. My hands-on debugging experience includes oscilloscopes, logic/protocol analyzers, JTAG/SWD, J-Link, OpenOCD, Segger RTT/SystemView and power profiling. I have developed commercial products from initial architecture through hardware, firmware and software to tooling and mass production for internationally recognized brands. WHY CLIENTS HIRE ME I am not limited to one layer of a product. I can follow a problem from the electrical signal and analog front end through the MCU, firmware and communication stack to the backend, cloud and application. Clients typically involve me when: • An idea needs to become a working prototype and commercial product • A prototype works in the lab but fails in real-world deployment • A project has become technically difficult or unstable • Other engineers have been unable to identify or solve the root cause • They need an independent architecture or design review • Firmware needs debugging, optimization, migration or redesign • A prototype must become a reliable, manufacturable product • Cost, power consumption, performance or reliability must be improved • They need senior technical leadership across hardware, firmware and software TECHNOLOGY KEYWORDS MCUs/SoCs: STM32MP1/H7/F7/F4/L4/F0/L0/WB/WL/G0 · nRF52832/nRF5340/nRF9160 · SAM D20/D21/L21/R21/V70/V71 · SAMA5/SAM4 · i.MX6/i.MX7/i.MX8 · RT1064 · LPC1100/LPC4000 · PSoC · HT68 · ESP8266 · ARM Cortex-M0/M0+/M1/M3/M4/M7 PCB & Electronics: Altium Designer · KiCad · PCB Layout · Multilayer PCB · High-Speed · Signal Integrity · RF · USB PD · Motor Control Audio & Signal Processing: Embedded Audio · USB Audio · Audio Interfaces · ADC/DAC · DSP · Digital Signal Processing · Analog Signal Processing · Audio Measurement · Low-Noise Design Automotive & Industrial: OBD-II · RP1210 · DLMS · SNMP · Industrial Control · Custom Protocols Networking & Telecom: TCP/IP · HTTP · 5G · Asterisk · FreeSWITCH · SIP · SIP Trunk Dev Tools: STM32CubeMX · STM32CubeIDE · IAR Embedded Workbench · Keil MDK/C51/uVision · Arduino · Segger Studio · ST-Link V1/V2/V3/PWR Additional: MS Windows · USB Hub · Gaming Mouse · Gaming Keyboard · Gamepad · Steering Wheel · SIM Raceing · Device Drivers · Assembler