zhen LI

@bulubulu_li

IoT Embedded Systems Engineer STM32 ESP32 nRF52

China
About me
11-year embedded engineer, products shipping 50K+ units/year (temperature loggers, smart switches, gas alarms, BMS). Four bench product lines, all with demo videos: (1) HMI & motion control — LVGL panels with step/dir motor control; (2) offline voice — wake word + swappable language packs; (3) cameras — PIR trigger, Telegram alerts, OTA; (4) BLE wearables — nRF52840, 89 µA sleep. Production-grade OTA (4 partitions, rollback) on a 50K/yr fleet; MQTT with offline caching at 99.5% delivery. Matter/MQTT/Home Assistant. Deliverables: source, wiring, docs, demo video. Based in Yunnan, China.... Read more

Skills

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bulubulu_li
zhen LI
Offline • 
Average response time: 1 hour

See my services

Embedded Systems & IoT
I will develop stm32 firmware and hal drivers
From$15 / projectMore details
Embedded Systems & IoT
I will build esp32 matter firmware for smart home devices
From$15 / projectMore details

Portfolio

Work experience

Shenzhen_MeiLian Technology Co., LTD

Embedded Software Engineer Shenzhen Yidian Technology

Shenzhen MeiLian Technology Co., LTD • Full-time

Jun 2025 - Aug 2026 • 1 yr 2 mos

Designed and developed RTOS-based firmware for STM32 and ESP32 platforms. Implemented OTA updates and optimized system performance. Core expertise includes: - Firmware Development: Proficient in C and RTOS. - IoT Connectivity: WiFi, 4G, BLE, LoRa, NB-IoT, and MQTT protocols. - Hardware & Debugging: PCB design and hardware debugging. - Advanced Features: Low power design and OTA implementation. Achieved 0.7µA standby power consumption and 99.5% MQTT reliability. Developed cold-chain devices for -40°C environments. Enabled 50,000+ annual shipments and secured a 100,000-unit order.