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Urban Lens
A location-based urban analysis app for understanding everyday access and nearby nature.
View live project ↗ReactMapLibreCloudflare
BACKEND / PRODUCT ENGINEER
Technical depth,
thoughtful products.
I care about the systems underneath and the experience on top — turning complex problems into clear, useful products.
~/xiaoxiang/portfolio⌁
const engineer = {
stack: ["Python", "AWS"],
focus: "backend × product",
status: "shipping"
};
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01BUILD
WITH
PURPOSE
WITH
PURPOSE
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PROFILE
Backend / Product
Engineer.
Backend / Product Engineer building and improving an electricity retail customer information system across backend, frontend, AWS infrastructure, testing, and production operations.
Currently based in Fukuoka, Japan.
BACKEND / DATAPython · FastAPI · Pydantic · SQLAlchemy · PostgreSQL · DynamoDB · REST · OpenAPI
CLOUD / DELIVERYAWS Lambda · API Gateway · SQS · EventBridge · Cognito · S3 · ECS · IoT Core · CDK · CI/CD · CloudWatch
PRODUCT / QUALITYReact · TypeScript · Material UI · pytest · Vitest · Playwright · TDD · E2E
EXPERIENCE
APR 2026 — PRESENTElectricity retail customer information system
System delivery, billing workflows, integrations, migration, and production improvement.
NOV 2025 — FEB 2026Residential energy management application
IoT integration testing and a reviewed BFF / microservices prototype.
APR 2025 — NOV 2025EV charging and energy management platform
OCPP 2.0.1, MQTT recovery, reliability, testing, and launch support.
MAR 2025Kyoto University — Graduate School of Agriculture
Master of Agricultural Science · English-taught program and thesis.
SIDE PROJECTS
Small ideas,
in progress.
Personal projects.
More details soon.
SIDE PROJECT / 02MORE
SOON.
SOON.
IDEABUILD
SIDE PROJECT / 03CLIP
BROAD.private transfer · no cloud relay
BROAD.private transfer · no cloud relay