# Ruimin(Sara) L.

> Full Stack Software Engineer | Java | JavaScript | React | Express | PostgreSQL | MongoDB

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/ruiminsara

Hello! 👋
I am a full stack software engineer with a passion for lifelong learning, problem solving and always improving oneself 👩‍💻

Feel free to send me a message if you would like to know more about me. I am always eager to hear from others and expand my network on LinkedIn.


TECHNICAL SKILLS:
Front-End | JavaScript, JQuery, React, Redux, HTML5, CSS3
Back-End | Java, Node.js, Express, PostgreSQL, MongoDB, MySQL, RESTful API
Testing/Deployment | Jest, Mocha, Chai, Supertest, k6, AWS EC2, Docker, Loader.io, Nginx
Developer Tools | Git, Vim, Linux, Agile Methodology

## Work Experience
### Software Engineer @ Personal Projects
Jan 2023 – Present | San Francisco Bay Area

### LeetNote - Track your LeetCode | Full-Stack Engineer @ Personal Projects
Jan 2023 – Jan 2023 | Burlingame, California, United States
A LeetCode tracker to manage your LeetCode progress, including advanced features such as search, the ability to add personal notes, and the convenience of storing code snippets for enhanced productivity.

Tech Stack: React, Redux, Node.js, Express, Material UI, MongoDB, JWT, Heroku

• Designed a full stack project using MERN and Redux for users to track their LeetCode progress, and Material UI for a visually appealing and responsive user interface.
• Constructed a robust token-based authentication system using MongoDB for data storage, bcrypt for password hashing, JWT (JSON Web Tokens) and localStorage for storing the authentication token on the client-side.
• Improved Lighthouse performance from 52 to 99 by implementing optimization techniques, including lazy load, text compression and minification of JavaScript files.

### Bounty Marketplace | Full-Stack Engineer @ Personal Projects
Jan 2023 – Jan 2023
A Cowboy Bebop theme e-commerce website design for buyers to request items matching their described criteria.

Tech Stack: React, Redux, PostgreSQL, Firebase, Firestore, Bootstrap, Docker

· Developed a fully functional e-commerce website utilizing the PERN stack and Redux, and implemented Bootstrap and Styled Components to design an aesthetically appealing user interface.
· Implemented advanced features, including Firebase authentication, a real-time live chat system built with Firestore, seamless dark mode functionality, and automated email notifications, enhancing the user experience.

### Atelier | Back-End Engineer @ Personal Projects
Jan 2023 – Jan 2023 | Burlingame, California, United States
A back-end solution for an e-commerce platform with stress-tested improvements.
Tech Stack: PostgreSQL | Node.js | AWS | K6 | Docker | Loader.io | Nginx

• Implemented an existing API into multiple RESTful micro servers and used PostgreSQL to store millions of product information with ETL process.
• Reduced response time from 2000 ms to 2 ms through adding indexes and improving queries, and handled local stress tests using K6 under 1000 requests per second, significantly minimizing the latency.
• Deployed server and database with Docker on AWS EC2 instance, and scaled the application with Nginx and loader.io to handle over 2000 requests per second under 1% error rate.

### E-commerce Platform | Front-End Engineer @ Personal Projects
Jan 2023 – Jan 2023 | Burlingame, California, United States
An modern e-commerce product page with optimized functionalities and enhanced user experience.

Tech Stack: React | Node.js | Express | Jest | React Testing Library

• Built a functional e-commerce product page (overview and product details) with React and raw CSS, and over 80% Jest and React Testing Library coverage.
• Deployed on AWS EC2 instance and tested performance with Google Lighthouse.
• Implemented Agile methodology with Trello tickets, standups, retrospectives and git workflow.

### Research Assistant @ Guangdong Institute of Microbiology
Jan 2016 – Jan 2019 | Guangzhou, Guangdong, China


## Education
### Advanced Software Engineering Immersive in Computer Software Engineering
Hack Reactor
Jan 2023 – Jan 2023

### Open University Program in Computer Software Engineering
San José State University
Jan 2021 – Jan 2022

### Bachelor of Science - BS in Applied Chemistry
South China Agricultural University
Jan 2012 – Jan 2016


## Contact & Social
- LinkedIn: https://linkedin.com/in/ruimin-li

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Source: https://flows.cv/ruiminsara
JSON Resume: https://flows.cv/ruiminsara/resume.json
Last updated: 2026-03-20