𝗘𝘅𝗽𝗲𝗿𝘁 𝗣𝗖𝗕 𝗗𝗲𝘀𝗶𝗴𝗻𝗲𝗿 & 𝗘𝗺𝗯𝗲𝗱𝗱𝗲𝗱 𝗙𝗶𝗿𝗺𝘄𝗮𝗿𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 I am a dedicated hardware engineer and firmware developer specializing in high-speed, mixed-signal, and precision electronics. Whether you need a complex 12-layer HDI board or rock-solid C firmware for a timing-critical application, I provide end-to-end hardware solutions—from initial concept to a fully validated prototype. 𝗪𝗵𝘆 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗺𝗲? • 𝗙𝘂𝗹𝗹𝘆 𝗘𝗾𝘂𝗶𝗽𝗽𝗲𝗱 & 𝗟𝗶𝗰𝗲𝗻𝘀𝗲𝗱: I hold an active Altium Designer license and maintain a fully equipped in-house electronics lab for physical hardware validation. • 𝗙𝗹𝗲𝘅𝗶𝗯𝗹𝗲 𝗧𝗼𝗼𝗹𝘀𝗲𝘁: I have been designing professionally with Altium since 2015 and KiCAD since 2020, allowing me to seamlessly integrate with your preferred workflow. • 𝗙𝘂𝗹𝗹-𝗖𝘆𝗰𝗹𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: Because I write the low-level firmware and design the physical board, I bridge the gap between hardware and software to ensure your entire system works flawlessly. ➡️ 𝗖𝗼𝗿𝗲 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 • Complete Hardware & Firmware Development • Electronics Fast-Prototyping & Manufacturing Support • Component Selection, Cost Reduction, & BOM Optimization • Schematic Capture & PCB Layout ➡️ 𝗛𝗶𝗴𝗵-𝗦𝗽𝗲𝗲𝗱 & 𝗛𝗗𝗜 𝗣𝗖𝗕 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 • Design of up to 12-Layer HDI PCBs utilizing micro, blind, and buried vias • High-density routing for BGA packages (down to 0.35mm pitch) and 1000+ component boards • Controlled impedance and length matching for DDR, PCIe, USB, HDMI, LVDS, and Gigabit Ethernet • Strict Signal and Power Integrity (SI/PI) practices to mitigate EMI/EMC issues ➡️ 𝗠𝗶𝘅𝗲𝗱-𝗦𝗶𝗴𝗻𝗮𝗹 & 𝗣𝗿𝗲𝗰𝗶𝘀𝗶𝗼𝗻 𝗔𝗻𝗮𝗹𝗼𝗴 𝗗𝗲𝘀𝗶𝗴𝗻 • Data acquisition (DAQ) systems with ADC/DAC resolutions up to 24-bit and sampling rates up to 100 MSPS • Precision analog front-ends and fast ADC driver circuit design • Active and passive filter design for highly accurate test & measurement systems ➡️ 𝗘𝗺𝗯𝗲𝗱𝗱𝗲𝗱 𝗙𝗶𝗿𝗺𝘄𝗮𝗿𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • Low-level C programming tailored for timing-critical and hardware-interacting applications • Microcontroller expertise covering STM32, ESP32, ARM Cortex MCUs, and 8/16/32-bit PICs • Integration of wireless modules (Bluetooth, Wi-Fi, LoRa, 4G) and peripherals (SPI, I2C, USART, USB, CAN) • Custom DAQ firmware engineered for specific, reliable sampling rates ➡️ 𝗜𝗻-𝗛𝗼𝘂𝘀𝗲 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 & 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗶𝗼𝗻 𝗟𝗮𝗯 I don't just design your hardware; I bring it to life and prove that it works. I conduct thorough hardware bring-up and functional testing in my own lab, utilizing professional-grade equipment: • Digital Oscilloscope & Arbitrary Function Generator • 6.5-Digit Precision Bench Multimeter & Handheld Multimeters • LCR Meter & Programmable Power Supplies • Professional Soldering Iron & Heat Gun for rapid prototyping and PCB rework

Most hardware products don't fail at the idea — they fail at execution. I lead architecture, embedded, and firmware work for founders building hardware that has to ship at production, not just demo. I'm Karlis, principal engineer and founder of null2.one — a small senior studio for 0→1 hardware product work. We work with founders, scale-ups, and engineering teams where the cost of a wrong technical decision is months and six figures. Where I'm strongest — Hardware product architecture — Embedded systems and firmware (STM32, ESP32, nRF, Linux) — Power electronics, battery, USB-PD, thermal — Sensors and closed-loop control — Robotics and mechatronics — DFM and industrialization (EVT → DVT → PVT) What I actually solve — "Our prototype works on the bench but won't survive a factory." — "We've burned months on the wrong architecture and need to reset before raising again." — "We're juggling four freelancers and have no senior technical owner." — "We need to validate the risky paths before committing to tooling and certifications." — "Our BOM looks fine on paper and is unmanufacturable at volume." How I work — three phases, fixed scope, fixed price 01. Product Definition & Architecture — 4 to 8 weeks Turn product ambiguity into explicit architectural, commercial, and production decisions before execution begins. Output: a product definition that survives contact with production. 02. Prototype & Validation — 6 to 14 weeks Architecture-first prototyping that surfaces real constraints early. EVT-grade hardware with a clear path to production. Firmware, electronics, and mechanical integrated into one validated system. 03. Production Readiness & Industrialization — 8 to 20 weeks Design for manufacturing, supplier selection, EVT/DVT/PVT gate support, end-of-line test strategy, clean handoff to manufacturing. The work that decides whether first-run yield holds. Every engagement starts with Phase 01. No exceptions. You decide whether to continue to the next phase based on what comes out of the previous one. Indicative pricing (USD) — Phase 01 — Definition & Architecture: $8k–$25k — Phase 02 — Prototype & Validation: $35k–$120k — Phase 03 — Production Readiness: $60k–$250k+ Background — Principal engineer & founder, null2.one — Senior Product Manager, Aerones — robotics for wind-turbine inspection and maintenance — CTO & CCO, NovaticLab — patent-pending robotic automation — BEng, VIA University College, Denmark — 10+ years across robotics, embedded, IoT, wearables, ruggedized industrial hardware Why this works You stop paying for time and start paying for outcomes. Each phase has a defined deliverable and a price agreed before any engineering begins. You decide whether to continue at every gate — no open-ended retainers, no scope drift. Everything we produce belongs to you: architecture, design files, firmware, test procedures, supplier relationships. No IP lock-in. Who I work with — Hardware founders who need clarity and a real architecture before raising or building — Scale-ups who need deep technical execution on a critical system — Funded startups where the next architecture decision is worth six figures of avoided rework — Engineering teams that need senior system-level leadership without hiring a CTO Not a fit — Pure SaaS or web work — "Can you just build this?" hourly task work — Sub-$5k scopes — Buyers shopping primarily on price — Branding or marketing-only engagements Next step If you have a hardware product where the technical decisions are expensive to get wrong, send the job invite. I respond within one business day with an honest read on whether we're a fit. If we are, we scope a Phase 01 — fixed price, defined deliverable, no commitment beyond that.

I am a Hardware Engineer specializing in prototype-to-production electronics development. I help startups and product teams turn ideas, dev-board prototypes, and rough proof-of-concept systems into reliable custom hardware that is ready for testing, assembly, and manufacturing. My work covers schematic review, circuit design, PCB layout, embedded hardware integration, board bring-up, debugging, and manufacturing preparation. I understand that a design is not successful just because it works once on the bench. It must power up reliably, communicate correctly, route cleanly, fit mechanically, and be practical for fabrication and assembly. I have strong experience with ESP32, STM32, nRF52, wireless, IoT hardware, sensor integration, power management, motor controller , mixed-signal layout, and production-ready PCB design. I develop production-ready hardware using Altium Designer, KiCad, Cadence Allegro PCB Designer, OrCAD Capture CIS, and EasyEDA, delivering multilayer PCBs for embedded systems, IoT devices, industrial electronics, wireless products, battery-powered devices, and mixed-signal applications. I also work with real manufacturing constraints, including component availability, BOM optimization, footprint verification, JLCPCB and PCBWay assembly requirements, stack-up planning, and DFM. I am especially effective in projects that involve: • converting dev-board or module-based prototypes into custom PCBs • bringing up first-pass hardware and solving boot, power, or communication issues • cleaning up inherited schematics and layouts • improving reliability before fabrication • preparing designs for repeatable assembly and production My goal is always the same: deliver hardware that is practical, manufacturable, stable, and ready to move forward.

[ PCB Design • Firmware • RF • Production-Ready Hardware ] I help startups, individuals and product teams turn electronic product ideas into reliable, production-ready hardware. Most projects don’t start with a clean spec. There is usually a rough concept, an early prototype, or a design that is not behaving as expected. That’s typically where I come in. I work across the full development process, from system architecture and component selection through schematic design, PCB layout, firmware, bring-up, testing, and manufacturing handoff. The goal is not just to make something that works, but to build hardware that remains stable, repeatable, and manufacturable. A big part of my work is preventing problems early. Poor power design, RF issues, EMI, or layout decisions that cause instability later are common failure points. Fixing these after prototyping is costly, so I focus on getting the fundamentals right from the start. My work includes: * Schematic design and multi-layer PCB design (Altium Designer) * Embedded systems and firmware (C, C++, Rust, Embedded Linux) * Hardware debugging and root-cause analysis * RF design (BLE, Wi-Fi, LTE, GNSS, Sub-GHz) and antenna integration * Power electronics (DC/DC, battery systems, charging, PoE) * In-house validation, testing, and pre-compliance checks * DFM/DFT and manufacturing handoff (BOM, Gerbers, assembly documentation) I maintain a fully equipped lab for bring-up and testing, which allows issues to be identified and resolved early, before they reach production. I’ve worked on IoT devices, wearables, and industrial systems using platforms such as STM32, ESP32, nRF52/nRF53, and i.MX. I work directly with clients, keep communication clear, and stay involved until the design is stable. No handoffs, no guesswork, and no disappearing after the first prototype. If you’re building a hardware product and want it done properly from the start, or need to stabilize an existing design, feel free to get in touch.

I am a professional embedded software engineer with more than ten years of experience. My current areas of expertise are IoT Applications & Embedded Systems Design, including embedded hardware/software. - Connectivity Domain Ethernet 802.3, WLAN (Wireless 802.11), Bluetooth Low Energy protocol stack, and low layer I2C, SPI, UART, RS485, etc. technologies. - Good exposure and worked with various protocols likes I2C, SPI, UART, CAN. - Proficient with ESP32, Raspberry Pi, Atmel, ARM, PIC32, Renesas boards, and communication with various sensors. - Experienced in Android framework & HAL layer exploration, development, Customization and bug fixing on Qualcomm development boards. - Have experience using debugging tools such as Segger Jlink, CAN bus analyzer (CL3000), Logic analyzer. - IoT devices with wireless connectivity such as LTE, CAT-M1, NB-IoT, LoRa/LoRaWAN, BLE, WIFI, ZigBee, NFC - Experienced in AWS Service, AWS IoT. 🔑𝐊𝐄𝐘𝐖𝐎𝐑𝐃𝐒: Embedded Design, Hardware Design, Firmware Development, Mobile App Integration, IoT Device, Medical Device Design, Embedded Systems, Real-time Operating Systems (RTOS), Microcontroller Programming, Sensor Integration, Wireless Communication (Bluetooth, Wi-Fi), Low Power Design, Wearable Devices, Firmware Architecture, Embedded Software, Device Drivers, System-on-Chip (SoC), PCB Design, Signal Processing, IoT Platforms, Cloud Integration, Mobile App Development, Web Portal Design, Healthcare Technology, Remote Monitoring, Data Security, Telemetry, ARM Cortex, ESP32, Device Connectivity, Embedded Prototyping, Human-Machine Interface (HMI), Medical Device Compliance, Mobile-Connected Devices, IoT Security, BLE, Firmware Debugging, Connectivity Solutions, Edge Computing, Smart Devices, Industrial IoT.

I'm an independent freelancer and a results-focused Chartered IT Professional (UK) with over 20 years of experience in technical projects, including Industrial and Home Automation Systems, Embedded Systems, product prototyping, and firmware development. My expertise includes: ✅ Development and prototyping with Raspberry Pi, Banana Pi, and NanoPi NEO2 ✅ Microcontroller programming using ESP32/ESP8266, STM32, Arduino, and integration with BLE/Bluetooth, WiFi, Ethernet, Zigbee, GSM/GPS/GPRS, and Z-Wave ✅ Working with various LCDs & sensors, interfacing through I2C/I2S/SPI, RS232/485, Modbus, LoRa, NFC/RFID ✅ Designing HMI systems and building custom IoT SCADA solutions using Node-RED or bespoke platforms ✅ Advanced motor and servo control systems ✅ Mobile app development tailored for IoT and hardware integration ✅ Object detection and training using YOLOv8 and Python ✅ VIOP solution and configuration (VICIdial) Technologies; ✅ Python ✅ C ✅ C++ ✅ MySQL ✅ PHP ✅ Flutter ✅ VOIP (VICIdial) ✅ Node-RED ✅ MQTT 100% Satisfaction Guarantee: If you're not completely satisfied with my service, I offer a full money-back guarantee. It's a pleasure to have you visit my profile.

My name is Ruhul Amin. I am presently employed as a Senior embedded engineer and Tech Lead at BJIT Ltd. Software Company. Throughout my career, I have undertaken various projects involving microcontrollers, microprocessors, SoCs, and more. With a focus on embedded systems, I’m a software engineer. Thanks to my passion and hard work, throughout of my career I’ve developed a strong foundation in Embedded, IoT, FPGA, DSP, Machine Learning, and Desktop Applications. With years of expertise, quick learning and analytic skills, and an enthusiasm for new technologies and challenges, I can provide the best system architectural design and efficient market implementation in a short amount of time. Specialized Skills: C, C++, Python, Verilog, Arduino, ESP32, STM32, nRF52, MSP430, ARM, FPGA, DSP, SoC, RTOS, Embedded Linux, Yocto, UART, SPI, I2C, CAN2.0B, Bluetooth, IoT, MQTT, TCP-IP, Wireshark, Audio-Video Signal Processing, Xilinx ISE, Code Composer Studio, Visual Studio, Oscilloscope, Git, Jira, Confluence, etc.

I build production-ready IoT systems using ESP32, STM32, PCB Design, Modbus RTU/TCP, MQTT, and FreeRTOS—covering everything from bare-metal firmware to cloud integration with AWS IoT Core and Azure IoT Hub, plus Flutter mobile apps and real-time dashboards when needed. My solutions are built for real-world industrial and commercial deployments, not just prototypes or breadboards. If you need embedded firmware that is stable, connected, scalable, and maintainable—let’s talk. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHAT I BUILD FOR CLIENTS ✅ IoT Firmware Development End-to-end IoT firmware on ESP32, STM32, and ATSAM microcontrollers. MQTT over TLS, secure boot, OTA firmware updates, and low-power wireless design for battery-operated devices. I write firmware that runs in production — not just demos. ✅ Industrial Automation & Modbus Integration Modbus RTU and Modbus TCP firmware for industrial sensors, VFDs, PLCs, and energy meters over RS-485. FreeRTOS multitasking with concurrent Modbus polling, PID control loops, and cloud data publishing. Built for 24/7 uptime. ✅ Cloud-Connected Embedded Systems Full IoT pipeline: device firmware → MQTT broker → AWS IoT Core / Azure IoT Hub → time-series database → Grafana or custom dashboard. Experience with EMQX, Mosquitto, Firebase, and Docker-based deployments on Raspberry Pi. ✅ BLE & Wi-Fi Device Development Bluetooth Low Energy (BLE) firmware for sensor devices, wearables, and gateways. BLE GATT profiles, custom services, DFU (Device Firmware Update) over BLE. Wi-Fi provisioning, WPA2 enterprise, and mesh networking on ESP32. ✅ Flutter Mobile Apps for IoT Cross-platform iOS and Android apps that connect to your hardware via BLE, MQTT, or REST API. Real-time sensor dashboards, device configuration screens, push alerts, and OTA trigger from mobile. Flutter + Firebase or Flutter + custom backend. ✅ PCB Design for Embedded Systems Schematic capture and PCB layout in KiCad, EasyEDA, and Altium Designer. ESP32 and STM32 custom boards, power supply design, EMC considerations, and Gerber files ready for manufacture. DFM-reviewed layouts for production. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ TECHNICAL STACK Microcontrollers: ESP32, ESP32-S3, STM32F1/F4, ATSAM, Arduino RTOS: FreeRTOS (tasks, queues, semaphores, timers, interrupts) Protocols: MQTT, Modbus RTU/TCP, BLE GATT, I2C, SPI, UART, RS-485, CAN, HTTP/HTTPS Cloud: AWS IoT Core, Azure IoT Hub, Firebase, Google Cloud IoT, EMQX Languages: C, C++, Python, Dart (Flutter) PCB: KiCad, EasyEDA, Altium Designer, Proteus, EasyPCB Tools: Docker, Git, VS Code + PlatformIO, STM32CubeIDE, ESP-IDF, FreeRTOS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ INDUSTRY EXPERIENCE HVAC Control Systems Multi-zone HVAC automation with STM32, Modbus RTU sensors, FreeRTOS PID control, and remote monitoring via Azure IoT Hub. Designed for commercial buildings with 24/7 reliability requirements. Energy Monitoring Three-phase energy monitoring sensors, ESP32 firmware, MQTT data pipeline, and real-time dashboards showing voltage, current, power factor, and kWh consumption per circuit. Industrial IoT Modbus-based data acquisition from industrial sensors and meters. RS-485 networks with multiple slave devices, data aggregation, cloud upload, and alarm management. Multi-Sensor Integration Environmental monitoring systems combining temperature, humidity, pressure, CO2, and motion sensors. Wireless sensor nodes with BLE or Wi-Fi, gateway aggregation, and cloud storage. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ HOW TO GET STARTED Message me with a brief description of your project. I respond within hours and can usually schedule a discovery call within 24 hours. For fixed-price projects, I provide a detailed scope document before any work begins — no surprises. Shakaib Naqvi IoT Firmware Engineer · ESP32 · STM32 · FreeRTOS · AWS IoT · Azure IoT · Flutter · Modbus · PCB Design

🔌 Powering 3.5M+ connected devices worldwide. I deliver end-to-end IoT and AI-powered solutions from firmware to cloud for Smart Home, Automotive, Energy, and Healthcare industries. 📊 WHY CLIENTS CHOOSE ME: • 3.5M+ IoT devices connected in production (Geeni smart home ecosystem) • 10+ years building IoT products, from PoC to mass production • 599+ hours on active firmware contract (Zephyr RTOS, Nordic, BLE) • AI-powered development: agentic pipelines, intelligent automation, ML integration for IoT • HIPAA-certified team for medical IoT projects • Top Rated Plus, 100% Job Success Score 🔧 WHAT I BUILD: → Firmware Development: Zephyr RTOS, FreeRTOS, ESP32, STM32, NRF, ARM Cortex. SPI, UART, I2C, Modbus, GPIO → Wireless Connectivity: BLE 5.3, Matter, Thread, Zigbee, LoRa, MQTT, LTE-M, NB-IoT, WiFi → IoT Cloud Platforms: AWS IoT Core, Azure IoT Hub, Google Cloud IoT, Firebase, InfluxDB → AI & ML for IoT: predictive maintenance models, anomaly detection, sensor data pipelines, edge AI, agentic workflows → Mobile IoT Apps: React Native, Flutter, Swift, Kotlin — companion apps for connected devices → Security & Compliance: TLS, OAuth2, JWT, Secure Boot, OTA updates, HIPAA compliance 🤖 AI ENGINEERING: I integrate AI across the full IoT stack from edge inference on embedded devices to cloud-based ML pipelines. I build agentic AI systems, intelligent automation workflows, and enterprise-grade AI pipelines that go beyond simple chatbots into production-ready infrastructure. 🏗 INDUSTRIES WE SERVE: • Smart Home — built app ecosystem for 3M+ devices (smart bulbs, cameras, sensors, switches) • Automotive — OBD-II fleet management, connected car platforms, predictive maintenance • Energy — Smart Grid management, EV charging, HVAC telematics with cellular IoT • Healthcare IoT — ECG monitoring wearables, Remote Patient Monitoring (RPM), HIPAA-compliant platforms 👥 TEAM: I also lead a dedicated team of 20+ engineers: embedded/firmware, AI/ML, mobile (iOS + Android), backend, QA, DevOps, and project management. We can work as your extended engineering team — same timezone overlap, daily standups, transparent communication. 💬 MESSAGE ME with your IoT or AI project details — I'll respond with relevant case studies and a preliminary architecture within 24 hours.

I have enjoyed my career as an Embedded Engineer since 2016. My passion for the same made the career joyful. My inquiring nature and affinity to conviction helped in improving many areas of the field. Here are the few things I bring to Table * C/ C++ / Embedded C Knowledge * Experience with various 8/16/32 bit microcontrollers. * OS Concepts (With hands own experience in FreeRTOS and ThreadX) * Debugging Skills * Experience in Board Bring up. * Bootloaders * Industrial protocols: Modbus * IoT: MQTT, HTTP, TCP/IP. UDP * Ability to understand, analyze and design electronics hardware. * Experience in various modules like - I2C - SPI - UART - One wire - DMA - Interrupt - EEPROM - FLASH - LCD - HMI *Custom product design and development. * Experience in product development in medical and industrial domains. Here are some major products I have worked on - Chemistry analyzers - ECG simulators - ECG machines - PLC development - Immunochemistry analyzers - Biosafety cabinet