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Yena830/README.md

πŸ‘‹ Hi, I’m Yueyue (Joy) Lin

πŸŽ“ M.S. in Computer & Information Science @ UIUC (2026)
πŸ’» Software Engineer | Backend Systems Β· AI Applications Β· Scalable Infrastructure

I build production-ready systems that combine LLMs, distributed backend services, and cloud-native deployment.

πŸš€ Portfolio:
πŸ‘‰ https://yena830.vercel.app/

🧠 What I Do

  • Build AI-powered applications with real-time interaction and RAG pipelines
  • Design high-concurrency backend systems and microservices
  • Deploy scalable cloud-native architectures on AWS
  • Optimize latency, reliability, and system performance

πŸ›  Tech Stack

Languages

Python Β· Java Β· JavaScript Β· TypeScript Β· Go Β· C++ Β· C

Backend & Architecture

FastAPI Β· Spring Boot Β· Flask
RESTful APIs Β· Microservices Β· Distributed Systems
Async workflows Β· System Design Β· CI/CD Β· TDD

Databases & Caching

PostgreSQL Β· MySQL Β· MongoDB Β· DynamoDB
Redis Β· ElastiCache Β· Elasticsearch Β· Pinecone (Vector DB)

AI / LLM

LangChain Β· OpenAI Β· Google Gemini
RAG Pipelines Β· Prompt Engineering
LangSmith (LLM evaluation & benchmarking)
ASR / TTS real-time voice interaction

Cloud & DevOps

AWS (EC2 Β· Lambda Β· API Gateway Β· S3 Β· SQS Β· SNS Β· ECS Β· RDS)
Docker Β· Kubernetes Β· Terraform
GCP Β· Firebase

Frontend

React Β· Next.js Β· TypeScript Β· TailwindCSS

✨ Featured Projects

🎀 AI Mock Interview Platform

LLM-powered system supporting multi-round voice interviews with scoring & personalized feedback

  • Modular LangChain pipelines with OpenAI & Gemini
  • Resume-augmented RAG (Pinecone) β†’ πŸ“ˆ +30% question relevance
  • Real-time ASR/TTS voice interaction β†’ πŸ“ˆ +20% session completion
  • FastAPI + PostgreSQL backend for interview workflows
  • Dockerized & deployed on AWS EC2

πŸ‘₯ Used by 50+ users Β· 200+ interview sessions

⚑ High-Concurrency Restaurant Ordering Platform

Spring Boot microservices handling 500+ QPS

  • API Gateway with custom routing
  • Redis session management + SMS login + JWT auth
  • ElastiCache query optimization β†’ πŸš€ 79% faster load time
  • Flash sale system with distributed locks + SQS async processing

🌍 LLM Travel Planner Agent

Serverless AI travel assistant

  • Firebase Auth + Cloud Functions backend
  • Redis caching β†’ πŸ“‰ 37% fewer external API calls
  • Structured prompting to reduce hallucination

πŸ“« Contact

πŸ“§ yueyue0256@outlook.com
πŸ’Ό https://linkedin.com/in/yena830

🐱 Fun fact: My cat Luna reviews my pull requests.

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