Akbar S.

I write the firmware your product ships with: BLE and cellular IoT devices that run for months on a battery, update themselves remotely, and have never bricked in the field. Shipped work includes a cellular GPS tracking fleet, BLE HID devices, IMU-driven wearables, and smart lock systems — all running in production today. I'm Akbar, an Embedded Firmware Engineer with three years of production experience across asset trackers, smart locks, BLE wearables, and connected home platforms. Core specialty: Nordic nRF with Zephyr RTOS. WHAT I DELIVER Nordic nRF (nRF52840, nRF5340, nRF9160) on Zephyr and nRF Connect SDK — Devicetree, Kconfig, MCUboot secure bootloader, field-safe FOTA, nRF5 SDK to NCS migration BLE firmware — full GATT profile design, HID, telemetry streaming at 25 Hz without packet loss, IMU-driven wake, sub-10uA standby on production hardware Cellular IoT — MQTT over LTE-M/NB-IoT, GNSS positioning, geofencing, eSIM with physical SIM fallback, remote FOTA via nRF Cloud ESP32-S3 on ESP-IDF — BLE provisioning, AWS IoT Core integration, scheduling, OTA, command latency under 100ms on a commercial smart home platform Low-power design, watchdogs, fallback and recovery paths engineered before shipping — not after field failures HOW I WORK I ask the hard questions before writing code: power budget, update strategy, production volume, regulatory constraints Every delivery includes documented source, build and flash instructions, hardware test notes, and architecture rationale You own a codebase your team can maintain — not a black box TECH STACK MCUs: nRF52840, nRF5340, nRF9160, ESP32-S3, STM32L4/F4, NXP RT1180, i.MX91 RTOS: Zephyr, nRF Connect SDK, FreeRTOS, ESP-IDF, Embedded Linux, Yocto Wireless: BLE 5.x, GATT, HID, LTE-M, NB-IoT, Wi-Fi, GNSS, Thread, Zigbee Cloud: AWS IoT Core, nRF Cloud, MQTT, MCUboot, FOTA/OTA Interfaces: I2C, SPI, UART, CAN, USB, PWM, ADC, I2S, PDM Languages: C, C++, Rust, Python Send your specification or project description and you'll have a technical approach and timeline within 24 hours.