Your prototype works on the bench. The first time a real customer plugs it in, it falls over — Wi-Fi setup fails, the firmware locks up after a week, the battery dies in three days instead of three months. That's the gap I close. I'm an embedded systems and IoT engineer. I take connected devices from "it works for me" to "it ships to customers and survives in the field." Most of my work falls into three areas: Embedded firmware on ESP32, STM32, nRF52, RP2040, AVR, and Raspberry Pi. C/C++ and Python. FreeRTOS and bare-metal. Low-power design when battery life matters — pushing sleep currents into single-digit µA, debugging the wake-up paths, tracking down the rogue peripheral that's keeping your device awake. Connectivity across BLE, Wi-Fi, MQTT, LoRa, LTE-M, NB-IoT, CAN, RS-485. Consumer IoT and headless devices. Captive-portal Wi-Fi onboarding so a non-technical customer can set up the device from their phone. Systemd watchdog services that recover from network drops automatically. OTA update infrastructure for fleet deployment. SD card write minimization on Linux-based devices, because the field failure mode no one warns you about is filesystem corruption six months in. PCB design when the project needs it. 2 to 8 layer boards in KiCad and Eagle, IPC-2221/7351 compliant. DFM and DFT review baked in from the schematic stage. Signal integrity, RF layout, and the kind of board-level decisions that affect yield, cost, and certification much more than firmware ever will. A few things worth knowing about how I work: I'm honest about scope. If your project doesn't need a custom PCB, cloud infrastructure, or edge ML, I'll tell you. I'd rather build the right thing for your actual budget than oversell. I think about the device's whole life, not just the demo. SD card longevity, Wi-Fi recovery, what happens when your customer's router changes, what happens when the firmware bug shows up in month six. The failure modes that matter are rarely the ones that show up on day one. I document for the human who comes after me. The setup guides and handoff docs I write are aimed at a non-technical reader — your future self, your in-house team, or whoever takes ownership when the contract closes. If you're building a connected device and the path from working prototype to shipping product isn't obvious yet, send me a message with what you're working on. I'll tell you honestly whether I can help.

As a Top-rated Upwork freelancer and experienced Hardware Engineer, I thrive on designing and developing complete electronic systems that solve real-world engineering challenges. My work blends deep technical expertise in PCB design, RF engineering, and embedded systems with a strong focus on building production-ready, reliable, and scalable hardware products. Over the years, I’ve worked across the full hardware development cycle — from concept, schematic design, and PCB layout to firmware development, prototyping, RF optimization, and manufacturing support. I enjoy turning complex ideas into functional, manufacturable electronic systems that perform reliably in real environments. Here's a snapshot of the domains I've mastered: Hardware Specialties 💻🔌 ✅ Embedded Systems Development: Expert in designing embedded solutions using ESP32, STM32, PIC, Arduino, and Raspberry Pi (including CM4/CM5 platforms). I handle everything from low-level firmware (C/C++) to hardware integration, real-time control systems, and IoT-enabled devices. ✅ PCB Design & Hardware Engineering: Advanced experience in schematic design, multilayer PCB layout (2–16 layers), high-speed routing, power distribution, signal integrity, and EMI/EMC-aware design. I focus on turning circuits into robust, production-ready boards. ✅ RF & Microwave Engineering: Specialized in RF circuit design, antenna development, and electromagnetic simulation using CST, HFSS, ADS, and 4NEC2. My work includes LoRa, GPS, RFID, wireless communication systems, and RF optimization for real-world performance. ✅ Wireless & IoT Systems: Designing connected systems using Bluetooth, WiFi, LoRa, and custom RF protocols. I develop IoT devices for automation, monitoring, sensing, and smart control applications. ✅ Sensor & Embedded Integration: Experience with MEMS/IMU, GPS modules, RFID systems, displays, motor drivers, and industrial sensors for data acquisition and intelligent control systems. Design Tools 🧰 Altium Designer | KiCad | EasyEDA | CST Studio Suite | HFSS | ADS | MATLAB & Simulink | LTspice | NI Multisim | Proteus | 4NEC2 Project Experience 🚀 ✔ Raspberry Pi CM4/CM5 Carrier Board Development ✔ High-speed Multilayer PCB Design for complex systems ✔ ESP32, STM32 & Arduino-based embedded products ✔ RF & Antenna Design for LoRa, GPS, and RFID systems ✔ IoT & Wireless Communication Devices ✔ Motor Control & Automation Systems ✔ Power Electronics & DC-DC Converter Designs ✔ Custom Sensor-based Data Acquisition Systems ✔ Smart Home & Industrial Automation Solutions ✔ Prototype development to manufacturing-ready hardware My approach is centered around engineering precision, manufacturability, and system-level reliability. Whether it’s a small embedded controller or a complex RF-enabled multi-layer system, I ensure every design is optimized for performance, stability, and real-world deployment. I also support full product development — from initial architecture and schematic design to firmware, debugging, testing, and production assistance. I’m always excited to collaborate on innovative hardware ideas and help transform concepts into fully functional electronic products ready for manufacturing and deployment. Tags: Electrical Engineer, Electronics, Hardware Design, PCB Design, PCB Layout, RF Engineering, Antenna Design, Embedded Systems, Firmware Development, ESP32, STM32, Arduino, Raspberry Pi, IoT, Signal Integrity, EMC Design, High-Speed PCB, LoRa, GPS, RFID, Microwave Engineering, Altium Designer, KiCad, CST, HFSS, ADS, Power Electronics, Automation Systems, C, C++, Embedded C, RTOS, Wireless Communication, Prototyping, Manufacturing Support. Warm Regards, Muhammad Waleed

Senior Embedded Systems Engineer | IoT Developer | Wearable Technology Specialist | PCB Design Expert Your Trusted Partner for End-to-End Embedded Solutions: Delivering Production-Ready Hardware and AI-Integrated Systems in Weeks, Not Months. With 5+ Years of Expertise and 50+ Successful Projects in Wearable Tech, Industrial IoT, and Custom PCB Design. **100% Job Success Score | Same-Day Response Guarantee ** My core expertise includes: - Custom PCB Design & Rapid Prototyping - Wearable Technology Development (Medical Devices, Fitness Trackers, Smart Textiles) - Low-Power Firmware Development (C/C++/Python) for ESP32, STM32, Raspberry Pi, nRF52840 - TinyML & Edge AI on Microcontrollers (TensorFlow Lite, Edge Impulse, Scikit-learn) - Industrial IoT & Wireless Connectivity (BLE, LoRa, Zigbee, Cellular) - Cloud Integration & Data Management (AWS IoT, Google Cloud, MQTT, REST APIs) I don't just code—I architect scalable, energy-efficient, intelligent embedded systems that drive real business value. 💡 What I Deliver: Comprehensive Full-Cycle Development ✅ 1. Wearable Technology & Medical Devices - FDA-Compliant Wearables (ECG Monitors, Fitness Trackers, Thermoelectric Coolers, Health Sensors) - Ultra-Low Power Optimization for 3x Extended Battery Life - Flexible PCB Designs for Comfortable, Durable, Wrist-Worn Devices - Biomedical Signal Processing with Real-Time Analytics and AI Integration ✅ 2. End-to-End IoT Solutions From Single-Node Sensors to Scalable Networks: - Firmware in C/C++/Python (Bare-Metal, RTOS, Linux-Based) - Secure Cloud Connectivity (AWS IoT, MQTT, WebSockets) - Custom Real-Time Dashboards for Data Visualization (Grafana, InfluxDB) ✅ 3. Custom PCB Design & Prototyping High-Performance, Manufacturable PCBs Tailored for: - Low-Power Wearables and Medical Devices - Industrial Sensor Nodes with IP67/IP68 Ratings - RF/Wireless Systems (BLE, LoRa, Cellular) Tools: Altium Designer, KiCad, Eagle, Fusion 360 Capabilities: - Multi-Layer Designs (4+ Layers) with Impedance Control - DFM/DFA Optimization for Seamless Mass Production - Rapid Prototyping via 3D Printing and CNC Milling ✅ 4. TinyML & Edge AI Deployment Machine Learning on Resource-Constrained Devices for: - Predictive Maintenance (Vibration, Thermal Anomaly Detection) - Smart Sensors (Voice Recognition, Motion Tracking, Environmental Monitoring, Biometrics) - AI-Enhanced Wearables for Real-Time Health and Fitness Analysis Tech Stack: TensorFlow Lite, PyTorch, Edge Impulse, Scikit-learn ✅ 5. Python for Embedded Systems Leveraging Python Beyond Firmware: - AI/ML Model Training & Deployment (TensorFlow, PyTorch) - Automated Testing Frameworks (PyTest, Robot Framework) - Data Analysis & Visualization (Pandas, Matplotlib) - Medical Device Validation and Clinical Testing Protocols 🚀 Proven Project Portfolio: From Concept to Market Launch 🏆 AI-Powered Sports Tracker (TinyML + ESP32) | $12,000 Budget Challenge: Accurate Real-Time Swing Analysis for Baseball Training Solution: Deployed CNN Model on ESP32 with 98% Accuracy and IR Beam Detection Integration Impact: Accelerated Product Launch by 3 Months, Boosting Client Competitiveness 🏆 Thermoelectric Wrist Cooler (Wearable Tech + PCB Design) Challenge: Efficient Cooling in Compact, Low-Power Form Factor Solution: nRF52840 MCU with Peltier Module, Custom Flexible PCB, and Thermal Management Impact: Extended Battery Life by 200%, Enabling All-Day Comfort for Users 🛠️ Technical Stack - Hardware: ESP32, Arduino, STM32 (U5/H7/F4), nRF52840, Raspberry Pi - Software: C/C++, Python (Embedded & ML), Rust - AI/ML: TensorFlow Lite, PyTorch, Edge Impulse, Scikit-learn - Cloud: AWS IoT Core, Google Cloud IoT, InfluxDB, Grafana - PCB Tools: Altium Designer, KiCad, Fusion 360, LTspice 🌟 Why Clients Choose Me for Embedded Systems, IoT, and Wearable Projects ⚡ One-Stop Solution Provider - Eliminate the Need for Multiple Specialists: I Handle Schematic Design, PCB Layout, Firmware, AI Integration, Cloud Setup, and Mobile Apps ⚡ Demonstrated Reliability - 100% On-Time Delivery Across 50+ Projects - Zero Failed Prototypes Through Rigorous Simulations and Testing - Clean, Documented Code with Git Version Control for Easy Maintenance ⚡ Exceptional Communication & Support - Same-Day Responses (Within 6 Hours) - Weekly Milestone Reviews with Video Demos and Progress Reports - Comprehensive Technical Documentation Included - 90-Day Post-Delivery Warranty with Ongoing Consultation 🔥 Ready to Bring Your Embedded Vision to Life? Schedule a FREE 30-Minute Strategy Session Today, Including: -Technical Feasibility and Risk Assessment -Customized Timeline with Milestone Deliverables -Tailored Technology Stack Recommendations -Cost-Saving Strategies and ROI Projections Available Now for New Projects—Guaranteed Working Prototype in 2-3 Weeks. 👉 Click "Invite to Job" or Message Me to Get Started!

I am mechatronics engineer from Việt Nam with 7+ years of experience in designing PCBs. I am familiar with various CAD tools including tools preferred by Manufacturers. I am interested in doing this project with you. I have experience with Circuit Board designing and modification jobs. Handling circuits and PCB is my daily job. I would like to talk about this project in details please message in the inbox to discuss more. Expertise in: 1. KiCAD (main), Cr5000, EasyEDA, EAGLE, Altium, and other CAD tools. 2. PCB layout designing. 3. Design 3D model: Freecad, solidworks, CAD ... 4. Embedded device programming: Arduino, Avr, Esp8266, Esp32, Stm8,raspberry ... 5. Circuit Designing from Scratch. 6. Multilayer,Highspeed PCB design. 7. Python,labview software design

My name is Atta-ur-Rehman, a Senior Embedded System and PCB Design Specialist. Experience • 14 years of total experience, with a focus on Embedded systems Firmware development and PCB design since 2011. • Extensive work with international clients on diverse industrial products . • Extensive work with Multinational companies as a Remote firmware and PCB designer. Skills • Programming languages: C, C++, Python, Assembly. • Microcontrollers: Arduino, STM32, PIC , AVR , ARM M series, ESP32, ESP8266 • Single Board Computers : Raspberry pi (all models ), Orange pi (all models ) , • Compilers : Keil MDK arm , ESP-IDF , Mplab , MikroC , Eclipse , arduino , STM32 Cube ide . • Communication protocols: USART, SPI, I2C, Ethernet, Wi-Fi , Modbus , CAN , BLE , OBD . • Operating Systems: Embedded Linux, FreeRTOS ,Windows • Design tools: Expert in EDA tools like Altium, Eagle, KiCad, and simulation tools like SPICE or SPICE-like tools. • Cloud platforms: AWS IoT, Google Cloud IoT, Microsoft Azure IoT. • Cybersecurity: Knowledge of security principles and best practices for embedded systems. • Version control: Proficiency with Git, SVN, or other version control systems. Career Highlights • Developed innovative solutions for automotive, Avionics , communication ,power , healthcare, and consumer electronics sectors. • Successfully managed and delivered multiple high-impact projects, exceeding client expectations.

I specialize in building high-performance embedded systems and IoT solutions that drive efficiency and innovation. With over 5 years of experience, I deliver reliable, optimized code for hardware like Raspberry Pi, Rockchip SBC, RISC-V, Arduino, and ESP32, alongside full-stack development using Python, Rust, Django, and Node-RED. My DevOps expertise with NixOS ensures scalable, custom infrastructure for your projects. Notable Projects:SafeGuard Your Children: Designed an IoT-based safety solution, integrating ESP32 for real-time monitoring, improving response times by 25%. Outdoor Long-Range In-Sync Speakers: Developed a low-latency audio synchronization system, enhancing performance across distributed devices. Automated Vending KIOSK: Built a robust KIOSK system with Embedded C and Django, streamlining transactions for 10+ vending machines. I excel at debugging complex codebases, optimizing performance, and learning new tools (e.g., NixOS for DevOps) to meet client needs. Whether you need firmware development, IoT integration, or full-stack e-commerce apps, I’m here to deliver measurable results with precision and reliability. Why Work With Me? I offer flexible hours across global time zones, clear communication, and a passion for turning your vision into reality. Invite me to your project or schedule a consultation to discuss how I can help you succeed!

I specialize in embedded firmware and PCB development for IoT, industrial automation, wireless devices, and microcontroller-based products, as well as software development. I help startups, product teams, and hardware companies build reliable embedded firmware and PCB solutions for real-world products, along with software Development. My core work includes STM32, ESP32, Arduino, FreeRTOS, Modbus, RS485, CAN, BLE, Wi-Fi, MQTT, IoT gateways, sensor integration, PCB schematic/layout review, and firmware debugging. I can work on both sides of an embedded product: firmware and hardware. Clients usually hire me when they need help with: ✅ Firmware development for STM32, ESP32, Arduino, PIC, AVR, and nRF52 ✅ Debugging unstable firmware, communication issues, sensor errors, and hardware faults ✅ Modbus RTU/TCP, RS485, UART, SPI, I2C, CAN, BLE, Wi-Fi, MQTT, HTTP, TCP/IP ✅ PCB schematic review, multilayer PCB layout, Altium/KiCad/EasyEDA support ✅ IoT device development from prototype to working product ✅ Hardware bring-up, testing, documentation, and production-ready fixes ✅ Software and Dashboard Development (Python, NodeJs etc) What makes my work different is that I do not only “write code.” I analyze the full system: schematic, power, PCB layout, firmware architecture, communication timing, logs, and real hardware behavior. This helps find the actual root cause instead of only applying temporary fixes. My workflow is simple: Review your requirements, schematic, code, logs, and hardware setup Identify risks, missing details, and possible failure points Build or fix the firmware/hardware step by step Provide tested code, clear documentation, wiring diagrams, and handover files I have worked on embedded systems involving industrial controllers, IoT devices, wireless communication, custom PCBs, automation systems, sensor-based devices, and microcontroller firmware. If you need an embedded engineer who can understand both firmware and hardware, communicate clearly, and help move your product forward, I can help. Send me your project details, schematic, code, or issue description, and I’ll suggest the best practical next step.

Embedded systems engineer and hardware designer with 10+ years turning product ideas into manufactured electronics, from schematic and multilayer PCB design in Altium to firmware on STM32, nRF52, ESP32, and FPGA/Zynq platforms. I build wireless and IoT products using BLE, LoRa, and Zigbee, and I've delivered hardware for industrial, automotive, medical, and aviation-grade applications, including ATEX/explosive-zone rated designs. I have taken two of my own product designs from prototype through to full production runs. One scaled to 1,000+ units and another to 100+ units, with me handling everything from board design to manufacturing coordination along the way. 𝗪𝗵𝗮𝘁 𝗜 𝗱𝗲𝗹𝗶𝘃𝗲𝗿 𝗲𝗻𝗱-𝘁𝗼-𝗲𝗻𝗱: System architecture and component selection, schematic and PCB layout/routing (up to 10 layers, mixed-signal and high-speed interfaces), prototyping and validation of boards with hundreds of SMD components, and embedded firmware/driver development in C/C++ and Verilog running on FreeRTOS, Zephyr, and other RTOS. I also support feasibility studies, cost estimation, and turnkey manufacturing coordination with PCB fabs, suppliers, and test labs, plus PCB reverse engineering and reviving obsolete hardware. 𝗠𝗖𝗨/𝗦𝗼𝗖 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲: STM32, Nordic nRF52/nRF9160, TI wireless MCUs, ESP32, Renesas, and Xilinx/Altera FPGA/CPLD/Zynq SoC. If you need a hardware or firmware partner who can take a project from concept through certified, manufacturable product, let's talk about what you're building.

As an AOSP (Android Open Source Project) engineer, I specialize in designing, customizing, and optimizing Android platform for various devices. My role involves working with the Android framework, HAL (Hardware Abstraction Layer), kernel, and system-level components to deliver tailored solutions for device manufacturers and developers. I am passionate about building robust and innovative systems that enhance user experiences and contribute to the Android ecosystem.

Embedded firmware engineer, 4+ years shipping production firmware in C and C++ on ARM Cortex-M. I take products from board bring-up to certified, manufacturable firmware: ESP32, STM32, nRF52, NXP S32K, with FreeRTOS, Zephyr, and embedded Linux. Your product launch should not be delayed by flaky firmware, mystery resets, or power problems found during certification. That is what I am for. RECENT PRODUCTION WORK: - EV wallbox charger: dual-MCU architecture, ESP32 application processor plus NXP S32K144 safety controller over SPI, OCPP back end, MID-certified energy meter integration, A/B OTA with rollback and secure boot - Seven shipped home automation products: BLE Mesh, AWS IoT, Home Assistant integration, energy metering with per-unit hardware calibration, and end-of-line production test firmware for mass manufacturing - Wearable power optimisation: cut consumption by 40 percent and doubled battery life - Two medical-grade embedded systems for operating theatre use, zero post-deployment failures - Bare-metal STM32: wrote a cooperative scheduler with Cortex-M assembly context switching, plus Modbus RS-485 industrial links TECHNICAL STACK: MCU: STM32 (F1, F4, F412, H7), ESP32 (S3, C3), nRF51/52/91, NXP S32K144, Raspberry Pi, Quectel RTOS and OS: FreeRTOS, Zephyr, bare metal, Yocto, embedded Linux Wireless: BLE, BLE Mesh, Wi-Fi, Matter, Thread, LoRa Protocols: MQTT, OCPP, Modbus RTU and TCP, CAN, SPI, I2C, UART, HTTPS, TCP/IP Cloud: AWS IoT Core, Azure IoT Hub, Firebase, ThingsBoard Production: A/B OTA, secure boot, bootloaders, EOL test firmware, calibration UI: LVGL, Qt/QML HOW WE WORK TOGETHER: Week 1: discovery call, written scope, hardware and spec review, milestone plan so scope does not creep. During the build: regular progress updates rather than silence then a dump, shared repo access, demo video at every milestone. At handoff: documented code with a README and build instructions, plus a 30-day post-delivery support window. YOUR NEXT STEP: Send me a short message with your MCU, your wireless requirement, and your target date. You will get an honest answer on whether I am the right fit within a few hours, and if I am, a scoped plan with a timeline inside 24 hours. Also experienced with: ESP-IDF, STM32CubeIDE, nRF Connect SDK, device drivers, board support packages, hardware debugging with JTAG and SWD, logic analyser and oscilloscope work, EV charging firmware, bootloaders and A/B partitioning, low power design, battery optimisation and sleep modes, sensor integration, signal processing, smart home firmware, medical device firmware, industrial automation, and production test firmware.