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Freelance Backend Engineer
- in/crystal-zhu-640230281
- https://contra.com/crystal_zhu_cd4ixbbq
- https://medium.com/@crystalhyomin
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payment-lifecycle-integration
payment-lifecycle-integration PublicReliable payment lifecycle backend with state transitions, idempotency, webhook handling, audit logs, and reconciliation.
Java
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rules-scoring-engine
rules-scoring-engine PublicDeterministic rules-based scoring backend with explainable outputs, versioned rule configuration, idempotent processing, and audit-friendly design.
Java
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document-workflow-core
document-workflow-core PublicDocument-centric workflow backend with explicit state transitions, role-bound permissions, and audit-friendly lifecycle control.
Java
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ai-assisted-decision-workflow
ai-assisted-decision-workflow PublicAI-assisted decision workflow backend with deterministic rules, explainable scoring, idempotent processing, and audit-friendly routing.
Java
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ecommerce-system
ecommerce-system PublicModular e-commerce backend system with authentication, order workflows, coupon service integration, and service-oriented design.
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ticketing-service
ticketing-service PublicEvent-driven ticketing backend with order processing, ticket generation, pricing logic, and Kafka-based workflow handling.
Java
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