Embedded & IoT engineer — I take connected products from schematic to app store: firmware, companion apps, and hardware, including FCC-certified medical and safety-critical devices. 10 years · Zephyr / Nordic / BLE · low-power · test-driven. Recently AI-accelerated.
| What | Where |
|---|---|
| Resume | resume/resume.md |
| CV (full record) | cv/cv.md |
| Case studies | portfolio/ |
| Hire me | Upwork ↗ · LinkedIn ↗ |
| Consultancy | BIII TECH ↗ · case studies ↗ |
- MCUs: ARM Cortex M0–M33 · Nordic nRF51/52/53/54/91 · STM32 F0–L4 · ESP32 family · PSoC 4/5/6 · SAMD21 · EFR32BG22 · DA14531 · low-cost Chinese MCUs
- Connectivity: BLE, WiFi, LoRa, Sub-GHz, Thread/OpenThread, Matter, Wirepas mesh
- RTOS: Zephyr (since 2020 — upstream contributor, 8 PRs merged into mainline) · FreeRTOS (since 2016) · ThreadX
- Firmware: bootloaders, OTA, low-power design, DAQ, drivers, kernel work
- Protocols & buses: SPI, I2C, UART, USB, RS485, CAN, I2S, MQTT, ZeroMQ, WebRTC
- Languages & tools: Embedded C, Python, Flutter, NodeJS, Java · CMake, OpenOCD, GDB, STM32Cube, Git
- Practice: TDD — automated SIL/HIL + interactive HIL & integration testing (ztest, Twister, Unity, CMock, FFF) · GitHub Actions CI/CD · AI-assisted development (Claude, Copilot, Gemini — daily over the last ~1.5 years)
- Hardware design: KiCad (PCB) · FreeCAD (enclosures)
| Project | What I did | Outcome |
|---|---|---|
| Clinical health wearable | Dual-core nRF5340 multi-sensor firmware + C#/MAUI companion app | FCC-certified medical product: 30-day battery, 4× BLE throughput, full CI/CD |
| CargoBeacon asset tracking | Wirepas mesh firmware (nRF52840) + EFR32 tracker + cross-platform apps | 5+ years battery life; multi-year Wirepas specialization |
| A21 firmware library | Code-protected binary library with a syscall-style ABI (SVC + vector table) | One board ships as multiple products — in commercial production |
| Gyani — robotics learning platform | Bytecode-interpreting embedded OS + flowchart IDE + PCBs, solo | Watch it run: product demo ↗, RC car ↗ |
| GoGoPowerJuice rental system | USB-C PD multi-charger hardware + full software stack (kiosk → rental app) | Live product ↗ — deployed at 12+ partner venues, apps on both stores |
| GPS hazard-warning system (Sunvis) | Dual-MCU safety device: GPS hazard detection + voice warnings + app w/ OTA | Complete safety product — hardware, firmware, app — solo |
| Project | Highlights |
|---|---|
| OpenThread marine control | Replaced a collision-prone mesh; Thread+BLE on one nRF52840; ThingsBoard + Alexa; demoed in 4 months |
| Lift monitoring system | CircuitPython→Zephyr productionization; replay-real-data algorithm harness cut testing by months |
| Environmental monitoring node | LoRaWAN + BLE node — 3+ years on 2× AA lithium, MCUboot OTA |
| Locomotive controller migration | Legacy CAN controller, feature-identical on nRF5340 incl. man-down auto-stop; BLE diagnostics |
| Protein filtration control (TFF) | 50+ params real-time; PID rewrite: 3× faster steady state — line later used in COVID testing |
| Blood slide heater | Hand-tuned PID thermal profiling; delivered in 3 months, in production at labs |
| Access control system | Multi-credential (RFID/Wiegand/HID/OSDP) controller — man-trap, tamper, RS485; 2× faster reaction, 5× faster OTA — in production |
| Connected access control board | STM32F4 + ESP32 dual-processor; OTA over both MQTT and BLE |
| Connected vending kiosk | Flutter kiosk on Raspberry Pi + C/Python hardware control + cloud inventory sync |
| BLE mesh home automation | Custom BLE beacon mesh + retrofit switchboard hardware; 2+ years running a real home |
| MOSIP identity platform (PoC) | Biometric capture (fingerprint/iris/face) on RPi4 + PKI certificate-chain trust + Spring Boot backend |
| Long-range DAQ system (freelance) | BLE 5 Coded PHY sensor nodes at 16 µA (~1.5 yr on CR2032) + ESP32-C3 gateway |
Full project list in cv/cv.md.
Verifiable reviews & ratings on my platform profiles:
- Upwork: $20K+ earned · 920 hours · 7 jobs ↗ · client-endorsed: Committed to Quality, Detail Oriented, Collaborative
- Freelancer: 4.9 / 5 across 20 reviews ↗ · member since 2019
"Amazing work with dedication to detail to make the project a success. I've worked multiple projects and very happy with the work and outcome. Would highly recommend and will continue to work on future projects and endeavors." — 5.0★ on Upwork · GoGoPowerJuice Stage 1 (10-slot charging dock) — Stage 3 is in progress today
"It was an amazing experience working with BIII TECH LLP. Goes above and beyond to get the project completed. Communication was concise and prompt, and there was a sense of accountability to help achieve the goals of the project. This was the first time working with BIII TECH LLP, and it won't be my last. Highly recommend!" — 5.0★ on Freelancer · the first GoGoPowerJuice USB-C PD board
"Great freelancer with expert skills, will hire him again in future." — German client, 5.0★
- Website: https://biii.in
- Email: iamanujpathak@gmail.com · anuj@biii.in
- Upwork: https://www.upwork.com/freelancers/~01a418fb5c16816290
- LinkedIn: https://www.linkedin.com/in/anuj-pathak-b63076119/