Lelin's Portfolio

About Me

Who Am I?

Hi, I'm Lelin Zheng (she/her, pronounced Luh-Lin). I am an M.S. Computer Science student at Northeastern University (GPA 4.0) with a passion for backend, full-stack, and cloud-native development. I build scalable, resilient systems using Java (Spring Boot 3, Spring Cloud), JavaScript (Node.js, Express.js, React, Angular), and Python — backed by PostgreSQL, MySQL, and MongoDB, with messaging via RabbitMQ and Redis Pub/Sub, deployed on AWS, Kubernetes, and Docker.

As a previous Software Engineer Intern at Jetsweat, I:

Developed 10+ RESTful analytics APIs for 50+ corporate partners, optimizing query performance and reducing response latency by 40%.
Strengthened data security by redesigning the MySQL schema with role-based access controls to ensure full restriction of unauthorized admin access.
Upgraded the admin dashboard (JavaScript, Node.js, EJS, Bootstrap) with real-time user-level analytics and accurate data integration, driving a 30% increase in active admin engagement through meaningful insights.

Before transitioning into software engineering, I worked as a high school computer science teacher. That experience honed my ability to communicate complex ideas clearly, mentor others, and lead with empathy — strengths I bring to every engineering challenge I take on.

Innovative Ideas

Generating solutions that drive progress.

Team Player

Actively contributing to shared goals.

Software

Crafting high-quality, user-centric applications.

My Specialty

My Skills

My focus in software development lies in designing clear, maintainable code through object-oriented programming principles. Proficient in Python and Java, I have developed a strong foundation in data structures and algorithms, with a keen interest in creating structured and efficient solutions. My experience so far has emphasized clean, modular code, allowing for scalability and adaptability in real-world applications.

As a Master's student, I also bring a working knowledge of full-stack fundamentals, and I enjoy learning about the full lifecycle of software development. I’m committed to building on these skills through hands-on projects and collaborative work, with a focus on continuously improving both my technical and problem-solving abilities.

Python

90%

MySQL

85%

Java

90%

JavaScript

85%

HTML

80%

NodeJS

80%

CSS

80%

Bootstrap

80%

C

70%

TypeScript

70%

Education

MS in Computer Science, Northeastern University, 2024 - 2027 (expected)

GPA: 4.0/4.0
Courses:
- CS 5004 Object-Oriented Design
- CS 5008 Data Structures, Algorithms, and Their Applications within Computer Systems
- CS 5200 Database Management Systems
- CS 6620 Fundamentals of Cloud Computing
- CS 6650 Distributed Systems
- CS 7580 Special Topics in Software Engineering: DevOps

Bachelor of Education - After Degree, University of Alberta, 2020 - 2022

GPA: 3.8/4.0
Enhanced time management and adaptability to essential for engaging and addressing diverse learning needs.
Developed strong communication and instructional skills, effectively convey complex ideas and foster engaging classroom environments.

MSc in Materials Engineering, University of Alberta, 2017 - 2019

GPA: 4.0/4.0
Published three peer-reviewed articles in renowned journals, highlighting research capabilities and dedication to academic excellence.
Delivered impactful presentations at international conferences, demonstrating effective communication and presentation skills.

Experience

Work Experience

Software Engineer Intern May 2025 - Aug 2025

-Jetsweat Inc., New York City, NY

Built 10+ RESTful APIs to surface user-level analytics and power a white-label admin toggle, enabling 50+ corporate partners to gain insights while reducing response latency by 40% through optimized queries and connection pooling.
Redesigned MySQL schema by adding an access-control column and enforcing role-based SQL queries to ensure 100% restriction of unauthorized admin access to individual video engagement data, aligning with security best practices.
Revamped the onboarding modal with React, using useState for step control and Redux to persist authenticated user context across views, improving recommendation personalization and driving a 25% increase in content engagement.
Enhanced the admin dashboard (JavaScript, Node.js, EJS, Bootstrap) with real-time engagement tracking and error surfacing, resolving 10+ production issues and increasing active dashboard usage by 30%.

High School Computer Science and Science Teacher Sep 2022 - Jun 2024

-Calgary Board of Education, Calgary, Alberta

Taught Computer Science to 100+ students in grades 10 and 11, covering programming fundamentals, algorithms, procedural and functional programming, OOP in Python, and HTML/CSS for web development.
Developed a Python-based scheduling application that efficiently organized a 10-team inter-school badminton tournament, reducing manual coordination time by over 80% and ensuring conflict-free match scheduling.