SANJO SUNNY

embedded engineer

AiZo TeQ

Jan 2025 - Present • 1 yr 4 mos

EV Charging & Smart IoT Solutions Led development and testing of RTOS-based embedded software for AC & DC EV chargers, covering firmware, hardware bring-up, and system integration. Integrated Wi-Fi, SIM, and Ethernet connectivity, improving device stability and uptime by 200%, and designed supporting PCB hardware. Configured DWIN HMI displays and implemented features including charging status, scheduling, energy metering, RFID authentication, and disconnect monitoring, increasing overall product capability by 50%. Decoded and adapted vendor-specific hardware communication protocols, ensuring firmware compatibility and aligning functionality with OCPP 1.6J-like architectures. Developed a Python-based MQTT automation framework for device testing, achieving a 100% increase in test throughput and improved validation coverage. Built a Smart QR-based Charging ATM, integrating backend services, payment systems, and security layers, enabling 3× faster user charging workflows. Implemented CAN communication with EVs to handle handshake, response analysis, fault detection, and safe disconnect scenarios. Designed and deployed WebSocket Client (C++) and Server (Node.js) for real-time charger-backend communication. Set up complete AC charger software and hardware stacks, including meter reading, vehicle communication, and backend integration. ESP32 IoT Switch Development & Optimization Designed and optimized ESP32-based IoT switch firmware with SQLite database integration, task scheduling, and control logic. Implemented AWS MQTT, mDNS, BLE, Wi-Fi, and UDP (offline communication), improving communication reliability by 50%. Delivered OTA updates, timers, schedules, and event-driven automation with 20% improved memory efficiency. Performed low-level software and hardware debugging, including Microchip firmware bug fixes, resulting in 2× performance and stability improvements.

embedded IOT developer

medicino • Freelance

Dec 2025 - Jan 2026 • 1 mo

Built both Hospital token device and token printing devices for a medical startup with display (UI), printer etc that save time by 50%; SPI, ethernet, GPIO, ethernet, C++, Node JS, REST

embedded engineer

V GUARD INDUSTRIES PVT LTD • Full-time

Nov 2023 - Dec 2024 • 1 yr 1 mo

Engineered TDS, turbidity, temperature monitoring systems which can analyse the working of water purifiers with embedded C++, MQTT, RTOS, REACT. Engineered the Working, consumption of Hot and cold-water models, SMPS adaptors, solenoid valves, motors Tested different water level monitoring systems using ultrasonic sensors, water level float etc using esp32.