VR Education Platform

Led the refactor from a legacy ASP.NET + MagicOnion gRPC stack into a NestJS microservice architecture (7 domain services: auth, admin, world, MDM, public course, credit, model optimizer), and coordinated with the Unity client team on the gRPC → REST migration.

• Designed an AI Provider abstraction layer unifying OpenAI, Anthropic Claude, and Google Gemini behind a single interface for per-scenario switching.
• Used pgvector to embed curriculum content into PostgreSQL as the knowledge base for an AI teaching assistant, with streaming responses.
• Integrated Google Cloud Speech-to-Text and TTS for real-time voice interaction in VR classrooms.
• Integrated third-party 3D generation APIs to produce VR-ready scene assets on demand.
• Implemented a ring-buffered batch-write mechanism for high-frequency course events, avoiding memory overflow.
• Led migration of 70+ entities from MySQL to PostgreSQL (including RBAC, MFA, multi-tenancy).
• Managed the full GCP infrastructure (Cloud Run / Cloud SQL / Memorystore / GCS) entirely as OpenTofu IaC.
• Sized the cloud stack to workload (Cloud Run + Cloud SQL instead of managed Kubernetes) and applied committed-use discounts, reducing total cloud spend by ~20%.

MDM VR Management Platform

Built a device management console and on-device agent to manage thousands of Meta Quest / Pico / HTC Vive / Android education devices end-to-end — lifecycle, policy delivery, and remote monitoring.

• Device management: registration, grouping, status tracking (online / offline / disabled / retired), batch labeling, configurable sync intervals.
• Command dispatch: real-time delivery over MQTT (QoS=1) with batchId-scoped bulk operations and full lifecycle tracking (pending → delivered → in_progress → completed).
• Policy management: Kiosk mode, WiFi, system-update policies, USB / Bluetooth / screenshot restrictions, app allow/deny lists, pinned versions.
• App versioning: APK parsing and signature verification, GCS storage, versioned distribution.
• Health monitoring: auto-offline flagging after 3× sync-interval silence; expired-command cleanup.
• Data design: UUID v7 primary keys for native time ordering; JSONB storage for payload / deviceInfo for flexible extension.

ACG E-commerce Aggregation Platform

Consolidated the SSO hub and shared capabilities across 10+ products, managed as a pnpm workspace + Turborepo monorepo.

• Wrapped node-oidc-provider into an in-house OIDC Provider with React-side Silent Re-authentication.
• Separated the account domain into independent Profile / Phone / Password / TwoFactor modules.
• Built a Python risk / fraud service combining scikit-learn (RandomForest + GradientBoosting) with a rule engine, using SMOTE for class imbalance.

TPM Role

• Serve as the technical liaison with the education team — gathering requirements and consolidating compliance documentation.
• Rolled out an AI-assisted code review process into the development pipeline.

Education AI Application Platform (Langflow-based)

Built an enterprise AI application platform on Langflow, currently powering 20+ generative flows for subject content and exercise generation.

• Authored custom Python components: multimodal file parsing (PDF / Image → Gemini), EN/ZH bilingual prompt switching, JSONParser, DataFrameMerge.
• Designed Agent orchestration flows with SSE streaming and webhook callbacks.
• Deployment: Docker + PostgreSQL; GitHub Actions builds into AWS ECR and deploys to EKS.

Internal AI Gateway (Go + Gin)

Built a unified AI service gateway, fronting multiple AI and membership services behind a consistent interface.

• Solution Registry: syncs upstream flow definitions automatically and generates solution_id dynamically — adding a new flow requires no gateway change.
• Service Registry: centralized timeout / retry / rate-limit / health-check management for downstream services.
• Event-driven: four-state task model (started / progress / finished / error); Redis 24h TTL and proactive webhook callbacks.
• Two-layer cache (memory + Redis) to reduce redundant LLM calls.
• Deployed to AWS ECS with GitHub Actions blue-green deployment.

AI-Driven Recruiting & HR Policy Q&A Platform

Built an end-to-end HR workflow automation stack on the Claude Agent SDK.

• JD upload → Claude parses into structured role requirements and must-have / nice-to-have criteria.
• Playwright MCP automates candidate search and scraping on the job board.
• Claude scores each résumé against the JD with weighted criteria, producing a shortlist and screening report.
• A second app handles HR policy Q&A by reading local Markdown / PDF and returning answers with source citations.

OIDC / Federation Identity Hub

• Designed and implemented the OIDC Provider from scratch as the unified login hub for all internal clients.
• Integrated 6 enterprise and social SSO strategies (education-institution federation and mainstream social logins).
• Designed MFA sign-in state flow, CSP / CORS cross-origin OIDC compatibility, and logic for forced SSO and inactive-account auto-provisioning.

Next-Generation Account & Organization Services (greenfield)

• Full account lifecycle (Create / Bind / Patch / Inspect / Bulk Create), SSO details encryption, and redact-log mechanism.
• Organization creation, member invitations, approval flow, role permissions, domain + wildcard verification (for legacy-system migration).
• Event-driven architecture emitting account.created, sso.bound, user.transferred to drive CDC synchronization.

Platform Shared Libraries

• Webhook framework: generation, async delivery, broadcast retry — reused across services.
• Event Store library: Event ID, revision management, multi-host resolution, reconnection.
• CQRS framework: automatic revision progression for Aggregate Roots.
• Multi-vendor SSO strategy library: supports Azure v2.0, Google SAML, and OIDC.

Architecture & Infrastructure as Code

• Applied Event Sourcing + CQRS + DDD; led migration of 6 core services into a unified monorepo with no business disruption.
• Customized Directus as the backend storage solution for various provisioning specs.
• Managed multi-environment resources with Terraform + Terragrunt (production tasks / webhook sidecars / OPA / CDC Lambda + SQS / mailer queues).
• Operated across AWS (ECS / Lambda / SQS / ECR / Athena / CloudWatch) + Azure DevOps + GCP (Cloud Functions) in a multi-cloud environment.
• Handled multiple P0 incidents during 24/7 on-call rotations — including site-wide login outages, multi-AWS-service disruptions, and domain disruptions.

Team & Culture

• Served as mentor, led PR reviews, drove knowledge sharing.
• Helped establish technical best practices and development standards; shared practitioner insights regularly at engineering meetings.
• Authored RFCs, ARDs, and SAs as team-level technical decision records.

Creator Commission Platform (core developer, 880+ commits)

Independently built a commission platform for doujin creators — covering the full trade loop from commission listings, orders, multi-stage payments, to real-time communication.

• Product evolution: shipped initially as a Laravel monolith for fast market validation; as complexity grew, led the refactor into a NestJS + Next.js monorepo with DDD-driven domain separation and SoC.
• Built a cacheable / resizable assets mechanism; multi-provider payment collection (credit card, bank transfer, MyPay, etc.).
• Built a real-time communication system with Socket.io + Redis pub/sub.
• Built a diversified notification stack (in-app, email, Firebase Web Push).
• Implemented a weighted-scoring personalized recommendation algorithm.
• Profanity filtering, identity verification, content moderation; Elasticsearch tuning; dynamic SEO / Open Graph.

Web3 / Blockchain

• Wrote gas-efficient, zero-pitfall, readable ERC-721 contracts.
• Built an EVM-interactive frontend with Nuxt 3 + Ethers.js.
• Implemented an NFT rarity-weighting and image-composition pipeline in Python.
• Integrated decentralized storage; achieved full audit coverage on contracts.

Shared Modules & E-commerce Ops

• Extracted cross-product shared modules (SMS verification, OTP) into an internal API.
• Set up an in-house private VPN to isolate the testing environment.
• Maintained the Magento 1.9 storefront.

Non-technical Tech Lead Responsibilities

• Project communication and requirements analysis; emergency handling and cross-team coordination.
• Third-party vendor negotiation on contracts and integration specs — e.g. negotiated payment-processor fees to ~20% below market.
• Remote-work environment setup and operations cost control; engineering interviewing.

Achievement System (built from scratch)

• Designed a library to interface with ML Team data and normalized the data format.
• Exposed client endpoints for data retrieval; designed corresponding APIs per requirements.
• Refactored portions of legacy code.

Internal Systems & Infrastructure

• Maintained and extended CMS / CRM / internal APIs.
• Used the existing Terraform stack for automated deployment; authored IaC to manage infrastructure.
• Handled system tuning and failover design under high-traffic scenarios.

Top-30 Site CMS Development

• RBAC design: hybrid-level organizational permissions.
• Content management UI; AI tagging UI producing to Kafka for downstream pipelines.
• Reporting and GA statistics integration with D3.js visualizations.

0 → 1 Independent Projects

• Worked with designers to independently build and operate multiple 0→1 small projects.
• Built a cloneable, independently deployable content-site template on a monolithic architecture.
• Maintained legacy code.