Air Quality Monitor Product Development - Development and maintenance of air quality monitor firmware - Experience various technology stacks as an IOT product. - Experience in Cypress STM32 Chip Module (WiFi & BLE, WICED framework) - Experience in ESP32 (Ethernet, BACnet, Etc.) - Experience in various sensor (temp/humid, co2, tvoc, pm) - Develops the HTTP Route for local API. - Experience in RTOS, MQTT, HTTP Route, OTA, Uart, SPI, ETC.. - Main Development Language C Sub 1 ghz Mesh network Project - Development of a product that creates a mesh network using RF frequency of sub 1 ghz. - Firmware Structure Design - Firmware Function Development - NFC function implementation - Main Development Language C Embedded Software Engineering - Design OOP code in C language to reuse, remove the degree of coupling - Firmware design for Unit Test (Use cmock, Ceedling) - A study on Firmware Architecture suitable for small start-up - Review and test sensor modules and chips HW specs by manufacturer. - Various methods are tried with the firmware team for the development process suitable for the current organization. Development Culture - Experience Agile sprint under the leadership of Product Manager. - Issue & Ticket Management Using Jira - Release management using Git Flow and CI/CD - Coding Standard is defined and updated continuously. - Code Review & Unit Test

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Web application project - Development based on eGov framework. - RDB Structure Design and ERD Management - Back-end development (java, spring framework) IOT device development project - Prototype production using Arduino and Raspberry PI - Design and manufacture test PCBs - Experience of manufacturing a device with an AVR chip (ATtiny type) - Implement wireless communication using commercialized RF modules National research project - Design and development of wireless fire detectors for research purposes. - A wireless device is implemented using 447mhz RF module, which is a Korean safety frequency band. - After small mass production, experience of installing on testbeds. - IOT device planning, design, mass production, installation, management, all lifecycle experiences.

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