Lu Xu — Software Engineer
I am a full‑stack software engineer with a passion for building production‑grade systems with scalable cloud infrastructure.
I am open to any new grad roles.
Experience
Terra Byte X
Software Engineer Intern
May 2025 – Aug 2025 • Remote, San Mateo, CA
- Built full-stack coding assistant leveraging OpenAI GPT-4o API with React frontend and Node.js backend, implementing real-time algorithmic problem-solving and Big O complexity analysis; increased user interview preparation efficiency by 40% across 2,500+ beta users
- Engineered scalable FastAPI REST backend with asynchronous processing, handling 12,000+ daily API requests with 99.5% uptime and sub-150ms P95 response time
- Implemented Redis caching layer and PostgreSQL query optimization reducing database latency by 65% and improving system throughput by 45%
- Architected containerized AWS cloud infrastructure using Docker, ECS Fargate, and Terraform IaC; implemented auto-scaling policies and resource optimization strategies reducing operational costs by 35% while supporting 3x traffic growth during peak usage periods
- Engineered CI/CD pipeline with GitHub Actions and automated testing (Jest, Pytest); maintained 92% test coverage across frontend and backend with comprehensive test suites
Projects
Campsite Monitor🔗
Python, FastAPI, React, TypeScript, PostgreSQL, AWS (ECS, Lambda, RDS), Docker, CI/CD
- Built production-ready platform serving 200+ active users, reduced manual campsite availability checking, and saved users 8+ hours weekly through automated email/SMS alerts using Python and JavaScript
- Developed FastAPI + SQLAlchemy REST API with asynchronous processing, achieving <300ms average response time; implemented robust notification pipeline processing 5,000+ daily checks with 98.5% system uptime
- Created React + TypeScript single-page application featuring user preference management, data visualization charts, and real-time campsite availability updates with mobile-responsive design
- Implemented intelligent caching system (65% hit rate) using Redis, exponential backoff retry logic, and rotating user agents to prevent IP blocking while maintaining 100% compliance with robots.txt protocols
- Leveraged ECS Fargate containers, Lambda functions, and RDS PostgreSQL database with auto-scaling configuration; reduced infrastructure costs by 30% and implemented CI/CD pipeline using GitHub Actions achieving zero-downtime deployments
Furever — iOS Pet Playdate Matching App
Swift (UIKit), Node.js, Firebase, GCP Compute Engine, Google Maps API
- Built with Swift and UIKit to help pet owners find and schedule playdates for their pets.
- Created a Node.js backend on GCP Compute Engine, integrating Firebase for real-time data synchronization.
- Integrated Google Maps API to provide pet playdate matching and navigation features based on location.
- Used Firestore to enable seamless 1:1 messaging between users before meetups, with real-time updates and an intuitive UI/UX for smooth scheduling and communication.
Skills
PythonJavaScriptTypeScriptC++SQLJavaFastAPIReactNode.jsFirebaseUIKitSQLAlchemyAWS ECSAWS LambdaAWS RDSAWS S3AWS EC2AWS Route53AWS IAMGCP GCEDockerPulumiCI/CDGitWebpackJestPytestPostgreSQL
Education
Northeastern University - Silicon Valley Campus
Master of Science in Computer Science
Contact
Based in San Francisco, CA