Thai NgocQuyen

Architected a robust Modular Monolith backend using Spring Boot 3.3.5 and Java 21, cleanly structured for seamless transition to microservices.

Implemented high-performance proximity search utilizing PostgreSQL (PostGIS) spatial functions and Redis GEO queries to calculate and filter local pitches within a dynamic radius.

Engineered collaborative chat rooms with automatic pitch voting countdown queues powered by Redis Streams and WebSockets, automating match 'chốt kèo' upon timer expiration.

Constructed an internal economy ledger module utilizing Redis Distributed Locks with database-level idempotency filters, guaranteeing absolute transaction safety during high-concurrency wallet updates.

Devised an anonymizing soft-delete mechanism that strips PII data while preserving ledger auditability, alongside a strict blocking engine filtering chat, comment, and feed visibility.

Orchestrated the Loki + Promtail + Grafana + Prometheus stack for comprehensive observability, visualizing live operations and query performance metrics.

Engineered a 100% automated Triple-Layer Backup architecture featuring a Docker sidecar PostgreSQL service, GitHub Actions SSH pre-deploy snapshots, and OS-level cron compression scripts.

Designed a 10+ microservices ecosystem (identity, customer, sales, invoice, product, AI, file, notification, analytics, backup) orchestrated via Kong API Gateway in declarative DB-less mode.

Built an AI service using Python FastAPI + Celery workers to asynchronously generate customer churn predictions and behavioral insights backed by HuggingFace models.

Implemented automated Google Drive backup service with scheduled PostgreSQL dumps and secure service-account credential injection via Docker volume mounts.

Architected a monorepo React Native Expo frontend using a custom internal package system (@crm/ui-kit, @crm/auth-module, @crm/network-client) enabling rapid white-label deployment.

Secured all inter-service communication with RSA public/private key pairs and enforced JWT token validation at the gateway layer with rate-limiting and CORS policies.

Configured multi-environment deployments (development, staging, UAT, production) with isolated .env files and Docker Compose profiles per environment.

Architected a custom course collaboration engine implementing Git-like decentralized version control (fork, pull-request, merge) for peer-curated language content.

Designed low-latency P2P audio/video transmission channels via WebRTC mesh topology, optimized for interactive virtual language classrooms.

Integrated Azure Cognitive Services neural voice models for real-time text-to-speech and structural pronunciation evaluation with scoring feedback.

Secured all private messaging with End-to-End Encryption (E2EE) using hybrid RSA + AES-256 protocol, zero-knowledge message design.

Developed a distributed real-time translation engine using Facebook Lexicon for non-blocking concurrent stream processing without interrupting the video feed.

Deployed highly scalable microservices in a Dockerized architecture with Kong API Gateway and gRPC inter-service communication.

Designed a full microservices architecture with 5 independent Spring Boot services: Auth, Patient, Billing, Analytics, and API Gateway — each with its own PostgreSQL schema and Docker container.

Implemented high-performance inter-service communication using gRPC (synchronous calls) and Apache Kafka (asynchronous event streaming) for billing and analytics pipelines.

Built a real-time Analytics Service that consumes Kafka event streams to generate patient data insights without impacting transactional services.

Secured the entire platform with a dedicated Auth Service issuing and validating JWTs, enforcing RBAC policies across all microservice endpoints via API Gateway routing.

Architected the system for AWS deployment: ECS for container orchestration, RDS for managed PostgreSQL, and MSK (Managed Kafka) for fully managed event streaming at scale.

Delivered comprehensive integration test suites covering cross-service communication flows, alongside Swagger-documented REST APIs for every service endpoint.

Orchestrated 8+ microservices in a containerized Docker ecosystem with seamless API Gateway routing and Eureka service discovery.

Implemented asynchronous event streaming using Apache Kafka to manage orders, inventory state updates, and billing operations without blocking the request chain.

Integrated a multi-level Redis caching system reducing database read operations by 60% and significantly improving menu and order lookup response times.

Established real-time dining table and kitchen communication nodes using secure STOMP WebSocket protocols for live order-status broadcasting.

Integrated VNPay QR sandbox payment gateway supporting instant digital transaction settlement with webhook-based order confirmation.

Enabled full-text menu search using Elasticsearch with tokenized Vietnamese language support.

Built a complete product catalog with category filtering, image management, and stock tracking using Entity Framework Code-First migrations.

Implemented a stateful shopping cart and checkout flow with order summary, address management, and multi-item quantity control.

Integrated VNPay QR (Sandbox) payment gateway with return URL verification and transaction status reconciliation on the server side.

Developed a full admin area for CRUD management of products, categories, users, and order fulfillment workflows.

Applied Role-Based Access Control (RBAC) using ASP.NET Identity, separating customer and admin permission scopes.

Designed responsive, mobile-friendly UI using Bootstrap 5 with jQuery-enhanced dynamic interactions for a smooth shopping experience.