Sijin Wu
software engineer
San Jose,CA
Summary
**Active Seeking 2026 NG positions | CS@USC**
Hi, my name is Sijin Wu, a Master of Science in Computer Science student at the University of Southern California, specializing in distributed systems, full-stack development, web technologies, and database systems. I had my Bachelor's degree in Applied Mathematics & Statistics, and Economics from Stony Brook University with a GPA 3.96/4.00.
I’ve experience in building scalable backend services with Next.js and Firebase, designed concurrency-safe payment workflows with Stripe, and developed secure data platforms using PostgreSQL, Flask, and React. I also built end-to-end applications using Spring Boot framework and am proficient in technologies such as Angular, Node.js, MongoDB, PostgreSQL, MySQL, and familiar with tools like Git, AWS, and VS Code. Driven by a passion for innovation, I constantly seek out opportunities to deepen my knowledge in software engineering, and I’m excited to make meaningful contributions to advancing technology for real-world impact.
Overview
1
1
years of professional experience
Work History
Software Engineer Intern
Hua Yuan Science & Tech Association
San Jose, CA
05.2025 - 08.2025
- Developed a distributed backend ticketing system in Next.js, integrating Firebase Firestore as the NoSQL distributed database, ensuring fault-tolerance and race-free, synchronized performance under 200K+ monthly visits.
- Built Firestore data flows to ensure atomic and consistent updates across registration, ticketing, and payment workflows, eliminating race conditions and maintaining data integrity under high-concurrency load.
- Designed and built an async Stripe checkout flow with TypeScript, applied reserve-and-rollback concurrency control to handle inventory updates, and ensured consistency and scalability without overbooking.
- Implemented automated cleanup for expired payment sessions, lowering query load and reducing system latency by 30%.
- Built CI/CD pipelines using GitHub Actions and Vercel to automate to automate unit testing, integration testing, and development, adopting Agile methodologies to deliver features iteratively and improve release reliability by 90%.
Research Assistant
Stony Brook University
New York, NY
05.2022 - 08.2022
- Developed a patient database access platform in React and Flask, integrating PostgreSQL as the relational database, and scaling to support 50K+ patient records with secure and efficient data access.
- Implemented an interactive UI with React Bootstrap, allowing doctors to do keyword-driven searches dynamically.
- Developed a query translation engine in Python that transformed JSON inputs into optimized PostgreSQL queries, supporting advanced filtering and cutting query execution time by 98%.
- Implemented RESTful API endpoints in Flask, integrating psycopg2 for PostgreSQL database access and enabling scalable CRUD operations with advanced filtering.
- Deployed and maintained the Query Builder platform on the Stony Brook University Hospital Linux Server.
Education
Master of Science - Computer Science
University of Southern California
Los Angeles, CA 08.2023 - 05.2026
Bachelor of Science - Applied Mathematics and Statistics & Economics
Stony Brook University
05.2023
Skills
- Java
- Python
- C/C
- JavaScript
- TypeScript
- HTML
- CSS
- SQL
- MySQL
- PostgreSQL
- Flask
- Spring Boot
- Expressjs
- Nodejs
- Angular
- React
- Nextjs
- Bootstrap
- AWS EC2
- AWS RDS
- Firebase
- MongoDB
- Azure
- Git
- GitHub
- Linux
- Android
- Redis
- CI/CD
- GitHub Actions
- Agile
- Software Development Lifecycle
- Debug & Troubleshoot
Personal Information
- Willing To Relocate
Android Stock-Trading Development
Full-Stack, TypeScript, and NodeJS
• Mobile App Demo: https://youtu.be/iVlHdPgo0nY
• Developed a full-stack stock trading application with a frontend built in Angular and Bootstrap, utilizing TypeScript as
the logic to enable real-time stock tracking and trading for 300+ USC students.
• Built the backend with Node.js and Express.js, integrating with MongoDB to build a flexible, high-performance backend.
• Deployed on AWS Elastic Beanstalk, providing a secure, automated, and auto-scaling solution for the server.
• Developed Android applications in Android Studio using Java, customizing classes such as models and adapters.
Travel Web App
Backend Java Spring Boot, MySQL, AWS
• Travel App Demo: https://youtu.be/S4WUz2YRdME
• Led development of a travel planning web app, enabling trip recording with scalable backend services built in Java Spring
Boot and REST APIs for token-based authentication and cookie handling to ensure secure data management and access.
• Designed and implemented MySQL relational database schema; utilized Spring Data JPA for entity mapping.
• Utilized Amazon RDS to deploy a highly available and distributed cloud relational database architecture.
• Deployed the application on AWS EC2, providing a scalable and secure backend infrastructure.
Languages
English
Full Professional
Chinese (Mandarin)
Native or Bilingual
Interests
Full-stack development
Web development
Database development
AI and ML development
Timeline
Software Engineer Intern
Hua Yuan Science & Tech Association
05.2025 - 08.2025
Master of Science - Computer Science
University of Southern California
08.2023 - 05.2026
Research Assistant
Stony Brook University
05.2022 - 08.2022
Bachelor of Science - Applied Mathematics and Statistics & Economics
Stony Brook University
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