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Rijyel Sevilleno

@rijyelsevilleno

Embedded systems engineer at Fujitsu Ten Solutions Philippines, Inc. who cut sensor current to 18 µA and deployed secure OTA updates to 60,000+ devices.

Philippines

Message

At Fujitsu Ten Solutions Philippines, Inc., I led hardware and firmware for battery-powered BLE and LTE-M sensors. I cut average current from 120 µA to 18 µA and built a secure OTA update system deployed to 60,000+ devices with zero bricked units.

At CHINT Electric Philippines Corporation, I developed PLC and motor-controller firmware, designed an isolated I/O board that passed CE/EMC on its first submission, and wrote a BLDC motor driver that improved efficiency by 12%. My work spans hardware design and embedded firmware, from board bring-up through production test.

Experience

Work history, roles, and key accomplishments

Senior Embedded Systems Engineer

Fujitsu Ten Solutions Philippines, Inc.

Jan 2023 - Dec 2025 (2 years 11 months)

Lead hardware and firmware for battery-powered BLE and LTE-M sensors, from requirements to production. Designed 6-layer boards around nRF52840 and STM32L4, cut average current from 120 µA to 18 µA, and built a secure OTA update system deployed to 60,000+ devices.

NRF52840 STM32 BLE LTE M OTA Dual Bank Firmware Updating CI CD Hardware In The Loop Testing Low Power Design PCB Layout

Embedded Firmware & Hardware Engineer

CHINT Electric Philippines Corporation

Mar 2020 - Dec 2022 (2 years 9 months)

Developed firmware for PLC I/O modules and motor controllers on STM32F4/H7 using FreeRTOS, CAN-FD and Modbus. Designed a 24 V isolated I/O board with surge protection and EMC filtering, and wrote a field-oriented control (FOC) driver for BLDC motors.

STM32 STM32H7 FreeRTOS CAN FD Modbus FOC BLDC Motor EMC Python Test Fixtures

Junior Embedded Engineer

Pythos Technology Philippines Inc.

Jul 2018 - Feb 2020 (1 year 7 months)

Wrote drivers for I2C sensors, SPI displays, and UART GPS for wearables and smart-home products on ESP32 and nRF52. Performed board bring-up and debugging for 5 prototype revisions and built a BLE companion protocol.

ESP32 NRF 52x I2C SPI UART BLE Board Bring Up Debugging