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qingfan007/README.md

Hi there 👋

I'm Crystal, a backend engineer focused on API integrations, workflow-heavy backend systems, and data reliability.

Here are some places to find me:

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  1. payment-lifecycle-integration payment-lifecycle-integration Public

    Reliable payment lifecycle backend with state transitions, idempotency, webhook handling, audit logs, and reconciliation.

    Java 1 1

  2. rules-scoring-engine rules-scoring-engine Public

    Deterministic rules-based scoring backend with explainable outputs, versioned rule configuration, idempotent processing, and audit-friendly design.

    Java

  3. ai-assisted-decision-workflow ai-assisted-decision-workflow Public

    AI-assisted decision workflow backend with deterministic rules, explainable scoring, idempotent processing, and audit-friendly routing.

    Java

  4. ecommerce-system ecommerce-system Public

    Modular e-commerce backend system with authentication, order workflows, coupon service integration, and service-oriented design.

  5. ticketing-service ticketing-service Public

    Event-driven ticketing backend with order processing, ticket generation, pricing logic, and Kafka-based workflow handling.

    Java

  6. fastapi-docs-rag-assistant fastapi-docs-rag-assistant Public

    A RAG assistant for answering questions about the FastAPI documentation.

    Python