👋 Hi, I'm Alejandro Ramirez — a firmware developer specializing in ESP32 microcontroller development and embedded systems design.

I focus on building production-ready firmware using C/C++ and the ESP-IDF framework, with expertise in FreeRTOS-based architectures, custom communication protocols, and hardware-software integration. My work emphasizes clean code architecture, comprehensive error handling, and optimized embedded systems for performance and power efficiency.

• ⚙️ ESP32 Firmware: Modular, FreeRTOS-based applications with custom graphics engines and UI frameworks
• 📡 Communication Protocols: Binary UART protocols, WiFi, MQTT, ESP-NOW, and OTA update systems
• 🎨 Real-Time Graphics: Double-buffered OLED rendering with efficient memory management
• 🔌 Hardware Integration: Sensor interfacing, peripheral drivers, and low-level hardware control
• 🌐 IoT Solutions: Full-stack IoT platforms connecting embedded devices with cloud services

Proprietary firmware project featuring modular FreeRTOS architecture

• Custom double-buffered OLED graphics engine (pivotGraphics)
• Wi-Fi and ESP-NOW networking with peer discovery
• Integrated audio output and NVS persistent storage
• Modular app/game loader with safe concurrency patterns

Fixed 4-byte binary communication protocol for ESP32

• Designed for speed and simplicity in embedded environments
• Bi-directional and master-slave communication modes
• 60% memory reduction compared to JSON-based protocols
• Comprehensive validation and error recovery system

Full-stack IoT platform with ESP32, Raspberry Pi, Python, and React

• Secure Over-The-Air (OTA) firmware update system
• Real-time MQTT messaging architecture
• Python Flask backend for device coordination
• React + Vite responsive frontend interface

• Building modular firmware architectures for ESP32 platforms
• Implementing subsystem-safe routines for memory and time efficiency
• Developing diagnostic tools and performance benchmarking systems
• Creating clean abstractions and reusable scaffolds for embedded development
• Optimizing power consumption and real-time performance

Embedded Systems:

• ESP32 / ESP32-S3 firmware development
• FreeRTOS task scheduling and memory management
• Low-level driver development (I2C, SPI, UART, ADC)
• Power optimization and low-power modes

Programming & Tools:

• C/C++ (ESP-IDF, Arduino)
• Python (MicroPython, Flask)
• JavaScript/React (IoT dashboards)
• Git, PlatformIO, CMake

Communication Protocols:

• WiFi, Bluetooth (BLE), ESP-NOW
• MQTT, HTTP, WebSockets
• Custom binary protocols

💼 Open to firmware development internships and collaboration opportunities

📫 Reach me at: [email protected] | Visit my portfolio: repvi.github.io