Thank you for visiting my profile. I am a Japanese senior software engineer. I work across IoT, embedded systems, firmware, web, and mobile. I like simple plans, small milestones, and steady delivery. My style is calm and precise. I do not overpromise. I design and ship real products end-to-end ( IoT + Firmware + Apps. From sensor to dashboard, clean and reliable. ) : * Firmware – ESP32/STM32/Arduino, FreeRTOS, BLE/Wi-Fi, sensors, OTA * Embedded Linux – Raspberry Pi setup, services, device I/O * Electronics bring-up – pin assignment, drivers, test firmware, basic PCB tweaks * Web dashboards – React/Next.js, charts, auth, APIs * IoT backends – Node.js, MQTT, AWS IoT/Azure IoT, alerting * Mobile apps – React Native/Flutter with BLE/Wi-Fi device control * QA & Docs – test plans, acceptance criteria, handover training # Tech Stacks I will provide : * Firmware: C/C++, ESP-IDF, STM32 HAL/LL, FreeRTOS, OTA, drivers * Embedded Linux: Raspberry Pi, Python/C++, systemd, Bash * Protocols: BLE, Wi-Fi, MQTT, Modbus, CAN (basic), REST/WebSocket * Web: React, Next.js, TypeScript, Node.js, Express, PostgreSQL * Mobile: React Native, Flutter, Bluetooth integrations * Cloud/DevOps: AWS IoT, Azure IoT, GCP, Docker, GitHub Actions * Tools: Git, JIRA, Zephyr (basic), Altium/KiCad (review & handoff) I write clean, tested code and clear README. I document pins, protocols, and build steps. I share short demos often. Time zones: PST/UK friendly. Languages: Japanese (native), English (Fluent). If you have a device to connect, data to visualize, or a prototype to turn into a stable product, I will help. Please send a short brief. I will reply with a simple plan, estimate, and timeline.