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in India

Firmware, Embedded systems software, C/C++/Assembly, BLE, Sub-GHz, LoRA, Wi-Fi, Thread, Matter, Zigbee, IoT, BLE Mesh network, various MCU's, Zephyr nrf connect sdk, stm32 sdk, various ble sdk

** I am what I am because of what we all are. ** I am a self-motivated, hard-working, and open-source contributor. I am also an Android Enterprise Certified Professional. My GitHub handle is *amsurana* Mobile experience [since 2009] * Worked on Qualcomm, Mediatek, Amlogic, Rockchip based devices. * Porting and Writing Device Drivers * Customizing Android Kernel * Android Automotive OS Expert - Projects and Consulting. Ported Automotive OS to RPI. * Android Firmware development for all kind of Devices [PCBA, Phones, Tablet, TV, Accessories] * Android SDK/NDK * Android Wearable * Custom ROM - I have deep experience in customizing Android and modifying the entire OS experience as per the requirements. Some of the customizations I have done - changing boot animations, modifying shutdown screen, removing bloatware, developing system-level apps, making a tablet a Kiosk (without permissions), Bluetooth stack modification, Carrier config updates, and many more. * Secure OS - Make your Android ultra-secure. * OTA for A/B Seamless or Non-AB devices * Secure Android OS using AVB Tool * MDM, EMM, Mobile Device Management - If you plan to use MDM or develop your MDM, do reach out to me. I have experience in Airwatch, SOTI, ScaleFusion, Gears42, and FieldX. Special Skills: Z-wave, Zigbee, IoT, Amazon Alexa, Google Home Assistant, Smarthome, IFTTT Keywords - Android, Web, Social Media Integration, Java, J2EE, Bluetooth, BlueZ, DBus, AOSP, Custom ROM, Docker, Play Framework, Linux, AWS, EC2, MongoDB, Eclipse, Cyanogen mod, LineageOS Android TV, Android OS, Custom ROM, Tizen, LinegaeOS, RaspberryPi, OrangePi, Khadas VIM, HiKey, Amlogic, Rockchip, Airwatch, SOTI, MDM, EMM, Pentest, Penetration Testing, Qualcomm, Mediatek

Principal Embedded Firmware Engineer specializing in nRF91 (nRF9160), nRF52, nRF70, STM32,ESP32 & Zephyr RTOS for low-power IoT devices. I help companies design and build reliable, production-ready connected devices — from prototype to mass deployment — with a strong focus on power optimization, connectivity, and scalability. ✔ Low power IoT device development ✔ Experience in Embedded Firmware design and architecture (design patterns, reliability and multithread) ✔ CE,FCC certification ✔End-to-end product development (Architecture → Firmware → Cloud → Production) ✔100% Client Recommendation 10+ years of full embedded development life cycle, including coding/standards, code reviews, source control management, build processes, testing, and operations experience. Experience in leading an engineering team. Core Expertise: • Embedded C, C++, Python • Zephyr RTOS, Matter (ConnectedHomeIP) • LTE-M, NB-IoT, 4G/5G • Power profiling, debugging (logic analyzer, oscilloscopes) • Secure firmware & cybersecurity analysis Hardware & Technologies: • Nordic SoCs: nRF9160, nRF52840, nRF52833, nRF5340, nRF70, nRF54 series • Cellular modules: Quectel, SIMCom • UWB (Decawave), GPS, Cell-based positioning • ESP32, Raspberry Pi, ARM Cortex-M systems 💡 What I deliver: • Ultra-low power device optimization & battery life tuning • Secure IoT connectivity (MQTT, HTTP, TLS, mutual authentication) • Zephyr RTOS & nRF Connect SDK based development • Sensor integration (I2C, SPI, UART, ADC, CAN, RS485) • OTA / FOTA firmware update systems • AWS IoT Core (Device provisioning, Shadow, OTA Jobs, Lambda, DynamoDB) • Board bring-up, debugging & production support 🚀 Selected Projects: • Medical wearable device (BLE + IoT gateway + ultra-low power) • NB-IoT / LTE-M asset tracking system with GPS & cloud integration • Smart sensor platform for environmental & industrial monitoring • AI/ML edge device (YOLOv5, MediaPipe, Edge Impulse) • Sound pressure level (SPL) monitoring device • Production test fixtures for firmware flashing & validation OBD-II and Automotive CAN Bus Experience: • OBD-II protocol development • Automotive CAN bus communication • CAN message transmission and reception • DBC file parsing and signal decoding • OBD PID data handling • Vehicle speed, VIN, mileage, and DTC decoding • MCP2515 CAN controller integration • CAN transceiver integration • CAN and OBD simulator development • Bench testing without a physical vehicle • CAN debugging using PCAN and CAN analyzers • Experience with Nordic nRF91, nRF52, ESP32, and embedded C/C++ ⚡ Why clients work with me: • Strong architecture & problem-solving skills • Experience leading engineering teams • Focus on real-world deployment (not just prototypes) • Clean, maintainable, and scalable firmware design

I build firmware that works — reliably, efficiently, and at scale. I'm the founder of Adben Industries Pvt. Ltd., a Kolkata-based embedded systems company with a dedicated team of hardware and firmware engineers. We've delivered production-grade embedded solutions to clients across the globe — spanning medical devices, industrial IoT, and wireless products. Microcontroller Platforms: STM32 (H/F/G/L), Nordic nRF51/52/54/9160, Silicon Labs EFR32, ESP32, NXP LPC & Kinetis, Microchip PIC16/dsPIC33/PIC32, TI Tiva C & SimpleLink, Dialog DA16200 — bare-metal and RTOS (FreeRTOS, ThreadX, Zephyr). Embedded Linux on Raspberry Pi, STM32MP1, i.MX6/7/8. What makes us different: 🔬 Deep debugging — J-Link, J-Trace, IAR I-jet, SystemView, Ozone, ITM, CoreSight. We trace, not guess. ⚡ Ultra-low-power expertise — including Silicon Labs SiWx917, a Wi-Fi SoC maintaining live connectivity at ~25 µA. A genuine game-changer for battery-powered IoT. 📡 Full wireless stack — BLE, Wi-Fi, LoRaWAN, NB-IoT, Zigbee, Sub-GHz RF, GPS, 3G/4G LTE. 🔌 Peripheral drivers — UART, SPI, I2C, I3C, I2S (audio), CAN, DMA, ADC, DCMI, parallel display, and more. 🖥️ FPGA development — high-performance data acquisition systems for deterministic, high-speed parallel data capture. 🧠 On-device AI/ML — CNN deployment using NXP eIQ Neutron and Arm Ethos-U55. 🏥 Medical device firmware — safety, reliability, and compliance are non-negotiable. 🛠️ Sensor integration — SpO2, PPG heart rate, IMU, LiDAR, radar, CO/CO2, environmental, and more. In-House Electronics Lab: 500 MHz oscilloscope, 7.5 GHz spectrum analyzer, VNA, SMU, bidirectional power supplies, load testers, professional rework stations, and a full suite of hardware debuggers. We validate on real hardware — every time. If you need an embedded engineering team that can own a project from architecture to production, let's talk.

🚀 Top Rated Plus | Embedded Systems & IoT Firmware Expert | Hardware Designer | 6+ Years of Experience As a Top Rated Plus Embedded Firmware & Systems Engineer, I help global clients transform ideas into production-ready embedded solutions. With 6+ years of hands-on experience across embedded firmware, hardware design, PCB development, IoT product engineering, connectivity stacks, and GUI development, I deliver solutions that are robust, scalable, and ready for the market. I have a strong track record of working with startups, SMBs, and enterprise clients in electronics manufacturing, industrial automation, consumer electronics, medical devices, EV/automotive systems, and IoT product development. If you’re looking for engineering excellence with consistent delivery and top-tier expertise, you’re in the right place. Why Clients Prefer Working With Me ✔ Top Rated Plus – meaning I deliver exceptional results on high-value, long-term projects ✔ End-to-End capability – hardware, firmware, cloud, and UI for a complete product ✔ Fast, proactive communication with detailed progress reports ✔ Highly reliable & deadline-driven ✔ Clean, maintainable, production-grade code ✔ Competitive rates with premium-quality engineering 🔧 Core Technical Expertise Firmware Development C | C++ | Python Experienced across MCU/MPU platforms, real-time systems, driver development, communication stacks, bootloaders, OTA, and memory/peripheral management. Hardware & PCB Design Altium Designer | KiCad Complete lifecycle: schematic → PCB layout → DFM → prototype testing. RTOS & Frameworks FreeRTOS | Zephyr | STM32Cube | ESP-IDF | Arduino | PlatformIO | Mbed OS Peripherals & Protocols USART · SPI · I2C · I2S · CANBus · OneWire · USB (HID, CDC, MSD, DFU) · Ethernet · Modbus · ADC · DAC · SD/MMC Connectivity & Wireless Technologies BLE: nRF52, ESP32 WiFi: ESP32, ESP8266 Cellular: SIM7600, EC25, EC200U, A7672x, etc. LoRaWAN, Zigbee, Z-Wave Cloud & IoT AWS | Google Cloud | MQTT | HTTPS | WebSockets 📡 OTA Update Specialist (Multi-Protocol) I design and implement **robust, fault-tolerant OTA update systems** over: WiFi · BLE · CAN · Ethernet · LoRa · Cellular (4G/5G) · Zigbee · Z-Wave Ideal for consumer IoT, automotive, industrial automation & remote deployments. 🖥 GUI & HMI Development for MCUs Advanced UI development using: LVGL | TouchGFX | Qt for MCUs Key strengths: ✔ Smooth animations & real-time dashboards ✔ Efficient memory usage on low-power MCUs ✔ Touchscreen integration (Capacitive & Resistive) ✔ Multi-display support: TFT, OLED, E-Ink 🧩 Microcontroller Experience Microchip: PIC12/16/18/24, dsPIC30/33, PIC32MX/MK/MZ STM32: F0/F1/F3/F4/H7/WB/U5 series Nordic: nRF51/52 Espressif: ESP32, ESP32-S2/S3, ESP8266 …and many SoCs/SoMs across industrial and consumer-grade devices. 💼 What I Can Do for Your Project Full embedded product development PCB + firmware + cloud integration Bootloaders & secure OTA Sensor/device driver development Industrial & IoT communication protocols Human–machine interface (HMI) design Optimization & bug fixing of legacy systems Prototyping, testing & production support Let’s Build Your Next Product If you want world-class embedded engineering, reliable delivery, and a partner who treats your project like their own—send me a message. Looking forward to contributing to your success. Best Regards, Haresh | Embedded Systems & IoT Engineer

I build firmware that runs for years, not months - my HVAC sensor node ships with 5-year battery life on 3×AAA cells. I'm a Zephyr Technical Contributor (Linux Foundation) and Nordic-certified in BLE, Wi-Fi, and cellular IoT, with 7+ years shipping ultra-low-power wireless IoT and wearable products from board bring-up to production OTA. If your product runs on Nordic nRF52, nRF53, nRF54, or nRF91 silicon with Zephyr RTOS and nRF Connect SDK, this is my home turf - not a secondary skill. 🛠️ SERVICES I DELIVER ✅ End-to-end product firmware - architecture, custom Zephyr BSP & drivers, application firmware, DFU/OTA, production release ✅ Board bring-up & BSP development - devicetree, Kconfig, custom board ports, driver development for new silicon and sensors ✅ Power optimization & battery-life audits - Power Profiling, sleep/wake architecture, radio duty-cycle tuning that turns "lasts days" into "lasts years" ✅ BLE firmware - central/peripheral, multi-connection (16+ clients), GATT design, bonding & security, Channel Sounding, BLE DFU ✅ Cellular IoT - NB-IoT/LTE-M on nRF9160/nRF9151, PSM/eDRX tuning, A-GNSS, device-to-cloud pipelines ✅ Migration & rescue - bare-metal/FreeRTOS → Zephyr ports, NCS upgrades, stalled or inherited codebases ✅ Production readiness - MCUboot secure boot, fleet OTA, CI/CD (GitHub Actions + Release Plan), factory test firmware 🏆 SHIPPED RESULTS 5-year battery life on 3×AAA - commercial HVAC zone sensor (nRF52840/nRF54L15, Zephyr) Dual-MCU BLE + NB-IoT/LTE-M global asset tracker (nRF52832 + nRF9160, nPM1300) - A-GNSS cut time-to-first-fix 50%, 3-month battery per charge 200 Hz real-time 6-axis BLE motion-capture wearable - 24 h runtime on 800 mAh 1 controller managing 16 BLE sensor nodes with Modbus RTU bridge and fleet-wide OTA and many more 📟 MCUs & SoCs nRF52832 · nRF52840 · nRF5340 · nRF54L15 · nRF54LM20 · nRF9160 · nRF9151 · ESP32 · ESP32-S3 · STM32 (F/L) · TI · ARM Cortex-M0+/M4/M33 · dual-MCU & multicore IPC · nPM1300 PMICs 📡 WIRELESS BLE 5.x (GATT, GAP, Channel Sounding, PAwR, BLE Mesh-ready) · NB-IoT · LTE-M · Wi-Fi · LoRa · GNSS/A-GNSS · Thread-capable multiprotocol designs 🔌 PERIPHERALS & INTERFACES I2C · SPI · UART · ADC/SAADC · PWM · QSPI flash · IMUs (200 Hz real-time) · SpO₂/optical & environmental sensors · thermopiles · e-paper · wireless charging · Modbus RTU · LED/buzzer/button UX ☁️ CLOUD AWS IoT Core (MQTT, Jobs, shadows, fleet OTA) · nRF Cloud · CoAP/LwM2M · TLS/DTLS provisioning ⚙️ STACK & PROCESS Zephyr RTOS · nRF Connect SDK · FreeRTOS · ESP-IDF · STM32 Cube MX/IDE · Embedded C · devicetree/Kconfig · MCUboot · CMake/west · Git · CI/CD · logic analyzers, RF sniffers, power profilers Send me your product brief or schematic — I'll come back with a concrete technical approach, risks, and milestones within 24 hours.