Tohid F.

Hi, I’m an **Electronics and Embedded Systems Engineer with 15+ years of experience** developing reliable, scalable, and production-ready electronic products. I help startups, inventors, and established companies turn product ideas into complete working solutions—from feasibility analysis and circuit design to embedded firmware, connected software, prototyping, testing, and manufacturing preparation. 🔷 **ELECTRONICS & PCB DESIGN** • Schematic design and electronic circuit development • Multilayer, low-power, mixed-signal, analog, and high-speed PCB design • Component selection, lifecycle review, and BOM cost optimization • Analog and digital sensor interfaces • Signal conditioning, ADC interfaces, and precision measurement circuits • Power supplies, battery charging, battery management, and low-power design • RF integration, including BLE, Wi-Fi, LoRa, GSM, LTE, and NB-IoT • EMC-, ESD-, grounding-, and manufacturability-aware design • Design-for-Manufacturing and complete production documentation 🟢 **EMBEDDED FIRMWARE DEVELOPMENT** • Embedded C and C++ development • STM32, ESP32, AVR, PIC, Arduino, and Nordic nRF52, nRF53, and nRF91 • FreeRTOS, Zephyr, ESP-IDF, and nRF Connect SDK • Bare-metal and RTOS-based firmware architecture • Peripheral drivers, hardware abstraction layers, and board-support packages • Bootloaders, secure firmware updates, and OTA update systems • Low-power firmware, sleep modes, battery optimization, and watchdog handling • UART, SPI, I²C, CAN, USB, Modbus, Ethernet, TCP/IP, and MQTT • Firmware debugging, validation, profiling, and performance optimization 🟠 **COMPLETE IoT PRODUCT & SOFTWARE DEVELOPMENT** • End-to-end IoT architecture covering devices, connectivity, backend, desktop, mobile, and cloud systems • Embedded-to-cloud communication using MQTT, HTTP/HTTPS, REST APIs, WebSockets, TCP/IP, and custom binary protocols • Device provisioning, authentication, configuration management, and fleet management • Telemetry ingestion, alarms, event logging, remote diagnostics, and device-health monitoring • Backend development using ASP.NET Core, REST APIs, SQL databases, and real-time communication services • Windows desktop application development using **C#, .NET, WPF, and MVVM architecture** • Configuration tools, calibration software, production-test applications, monitoring dashboards, and service utilities • Serial, USB, BLE, Ethernet, Modbus, CAN, and TCP communication between hardware and Windows applications • Real-time data acquisition, visualization, logging, report generation, and database integration • Data export to CSV, Excel, and custom reporting formats • Mobile application integration for device setup, control, monitoring, notifications, and firmware updates • Remote configuration, OTA workflows, fault reporting, and field-support tools • Sensor calibration, signal processing, system validation, and hardware–firmware–software integration • Functional prototype development through design verification, manufacturing preparation, and production release 📦 **WHAT I CAN DELIVER** • Product architecture and technical feasibility analysis • Complete schematics and PCB layouts • Gerber files, drill files, BOMs, pick-and-place files, and assembly drawings • Embedded firmware and communication protocols • Windows configuration, calibration, monitoring, and production-test software • Backend, cloud, and mobile integration • Prototype bring-up, testing, debugging, and design verification • Existing product redesign, performance improvement, and cost reduction • Production-ready technical documentation ⭐ **WHY CLIENTS WORK WITH ME** • 15+ years of multidisciplinary product-development experience • One engineering partner covering hardware, firmware, connectivity, desktop software, and cloud integration • Practical designs focused on reliability, manufacturability, scalability, and long-term support • Clear communication, structured documentation, and transparent technical decisions • Experience taking products from initial concept to tested, production-ready hardware • Strong troubleshooting capability across electronics, embedded software, communications, and system integration I do not just design circuits or write firmware. I build complete products that are engineered to work reliably, scale effectively, and move successfully toward manufacturing. 👥 **WHO I WORK WITH** • Startups developing new IoT or embedded products • Companies redesigning, improving, or reducing the cost of existing devices • Inventors who need support from concept through working prototype • Product teams requiring specialized electronics, firmware, PCB, connectivity, or software expertise • Businesses developing industrial monitoring, sensing, automation, data-logging, or connected-device solutions Share your product idea, existing design, or technical challenge, and I will help you define the most practical path from concept to a reliable, working product.