Bala K.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Principal Embedded 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 • RF sensing technologies, including mmWave radar, UWB, and Wi-Fi CSI. 💡 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 • Patient activity-monitoring solution using mmWave radar 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