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Sun Xinshan

@sunxinshan

Solutions architect at Weizhi Technology who shipped a family learning AI agent and designed high-traffic risk-control platforms.

China

Message

I designed and shipped Family Learning Assistant, an AI agent product that turns parents’ natural-language requests into learning-material workflows, vocabulary organization, exercises, and study-task tracking. I kept intent understanding and tool selection in the LLM while business validation and routing remained in deterministic code.

At Weizhi Technology, I owned core functionality of a financial risk-control feature platform, from feature design and development to production issue resolution. Earlier, at Ping An Financial Services, I owned risk-control systems including an LBS platform processing 200 million records daily, and at Airwallex I built China and Southeast Asia channel capabilities for cross-border payments.

Experience

Work history, roles, and key accomplishments

Current

Independent Developer

Current

Family Learning Assistant

Nov 2024 - Present (2 years)

Designed and shipped a family-facing AI agent product end to end, using a single agent with internal subgraphs and a unified Tool Registry. Implemented human-in-the-loop with LangGraph Checkpointer and split the backend into 11 domain modules.

Python fastAPI LangGraph React TypeScript MySQL SSE Langsmith Deep Seek AI Agents Tool Registry Human In The Loop

Senior System Architect

Weizhi Technology (Beijing) Co., Ltd.

Mar 2022 - Oct 2024 (2 years 7 months)

Owned core functionality of the risk-control feature platform, including feature design, development, and production issue resolution. Delivered design for replay, backfill, high-availability, graph features, ClickHouse integration, and multi-tenancy.

Feature Engineering Risk Control Clickhouse Multi tenancy High Availability Design Reviews Mentorship

Engineering Manager

Ximalaya Inc.

Jul 2021 - Mar 2022 (8 months)

Led the Precision Marketing Platform portfolio, including tag/profile system, resource-slot advertising, A/B testing, event center, and campaign delivery, with a team of 10+. Managed technical design and roadmap with product owners.

Precision Marketing Tags Event Center A B Testing Elasticsearch Kafka RocketMQ Team Management Roadmapping

Engineering Manager

Ping An Financial Services Co., Ltd.

Sep 2018 - Jun 2021 (2 years 9 months)

Owned the risk-control system portfolio including real-time geospatial (LBS) system, external-connectivity platform, risk-control middle platform, and API gateway. Led 8+ engineers and served as tribe architect for 50+ engineers.

Risk Control LBS API Gateway Spring Cloud Dubbo Kafka RocketMQ Redis MySQL Elasticsearch Sentinel Cat² Apollo Team Leadership

Senior Software Architect

Airwallex

Jun 2017 - Sep 2018 (1 year 3 months)

Built China and Southeast Asia channel capabilities for cross-border payments, including an FX distribution system. Owned system architecture and implementation, and led engineers to deliver on schedule.

Cross Border Payments FX Distribution Spring Cloud Cassandra Redis Docker Architecture Leadership

Software Designer

Hewlett Packard Enterprise

Sep 2011 - Jun 2017 (5 years 9 months)

Designed and developed the Service Manager product and its containerized deployment tooling. Built installation and configuration components for ITSMA on Kubernetes and Docker, and developed a log analysis tool.