Subhajit R.

Embedded Systems Architect | Firmware, IoT & Production Reliability

I help companies rescue failing IoT products and take prototypes to production. I work with founders, CTOs and engineering teams to turn embedded prototypes into reliable, production-ready products by identifying failures early, automating validation, and designing systems that survive real-world deployment. Since I am an entrepreneur with a team that developed our own products (RTLS, LMS platform), I approach embedded development with a product-owner mindset. Before adding a feature, I ask how it will be tested, how it can fail, how we will diagnose it remotely, what happens after power loss or communication failure, and how another engineer will maintain it two years from now. I have built intelligent products from sensors to the cloud: (covered in the case studies below) • Built a production scale Full Stack AI & IoT platform that scaled from 20 to 400+ installations in 3 years. • IoT solution developed to prevent custody Deaths in US federal prisons. - Deployed in 40 + prison agencies across USA. • LMS platform for corporate compliance training having 10 Lakh+ platform users. • Smart Home & Leakage Monitoring System - Deployed around 30K + units in buildings across USA and Canada. • Fleet Monitoring Solution - Deployed in old buses for Indian Government. • Hotspot Detection - Deployed in 3 planting plants and 2 material furnishing plants. I have an in-house team that consists of designers, AI fullstack engineers, and testers. We develop and debug prototype boards for your product. I may have all the skills and equipment that you are looking for. Where I create the most value: • Embedded product architecture and prototype-to-production engineering • Firmware architecture, RTOS and real-time systems • STM32, Nordic/nRF, ESP32 and ARM-based platforms • Embedded Linux, BSPs, drivers and edge computing • BLE, UWB, LoRa, Wi-Fi and connected-device systems • Firmware debugging, race conditions and difficult field failures • Automated hardware/firmware validation and regression testing • Fault injection, recovery design, watchdog strategy and diagnostics • OTA/update architecture and production support • Industrial IoT, gateways and device-to-cloud integration Specialization lies in Production Embedded Systems: STM32, Nordic, ESP32, UWB, RTLS, Linux, gateways, industrial IoT, hardware + firmware + cloud integration. I understand the complete product stack—from embedded hardware and firmware through connectivity, Linux gateways, cloud integration and deployment—so decisions in one layer don't create failures somewhere else. My Engineering Approach: I don't consider the job complete when the feature works on a developer's desk. I ask what happens after a power interruption, lost connectivity, memory corruption, unexpected user behavior, months of continuous operation, manufacturing variation and hundreds or thousands of deployed devices. I strongly favor repeatable automated validation over purely manual testing, and I design systems for observability, fault injection, diagnostics and recovery where the product justifies it. The goal isn't theoretical perfection. It is a maintainable product that behaves predictably in the real world. Core Technical Expertise: • Firmware & RTOS: Embedded C/C++, Zephyr, FreeRTOS, bare metal, bootloaders, OTA/FOTA, low-power design, drivers • MCUs: STM32, Nordic nRF52/nRF53, ESP32, NXP • Embedded Linux: Yocto, Buildroot, BSPs, kernel/device tree, U-Boot, secure boot, Mender, edge gateways • Wireless & IoT: BLE, UWB, LoRaWAN, LTE/Cat-M/NB-IoT, Wi-Fi, Matter/Thread, MQTT • Security & lifecycle: Secure boot, provisioning, device identity, certificates/TLS, encrypted storage, secure OTA I can also coordinate the surrounding cloud, dashboard and mobile layers when a product requires end-to-end delivery and help with Edge AI / on-device intelligence. (covered in portfolio/ case studies). Typical Products & Systems: • Industrial IoT devices and gateways • Wireless connected products • Asset tracking / UWB RTLS • Embedded Linux edge platforms • Device-to-cloud systems • Products requiring high reliability and long-term deployment Good Reasons to Contact Me: A good reason to contact me is if your embedded product is technically difficult, has to work reliably outside the lab, or needs someone who can take ownership beyond simply implementing tickets. If you're moving from prototype to production, dealing with a difficult field issue, or need an architecture/reliability review, send me the problem and I'll tell you how I'd approach it. I help companies build complete connected products that are scalable, secure, and production-ready. I focus on long-term product success, maintainable architecture, reliable engineering, and clear communication—not just delivering code.