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Achievement: Pull SharkAchievement: YOLO

Achievements

Achievement: Pull SharkAchievement: YOLO

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qllin2/README.md

Hi there, I'm Qi Lin

I am a Computer Science graduate from the University of Melbourne, specializing in High-Performance Systems, Software Architecture, and Algorithm Optimization.

I bridge the gap between low-level efficiency (C/C++) and high-level structural design (Java/Python).

Featured Projects

Architecture & Design

1. Java Architecture & Design Patterns Portfolio Java Design Patterns Refactoring A showcase of advanced OOD skills featuring Legacy System Refactoring (Pinochle) and Concurrent Simulation (Drone Delivery).

  • Key Tech: Strategy, Factory, Singleton patterns, GRASP Principles.
  • Highlight: Decoupled monolithic "God Classes" into modular, testable components using polymorphic interfaces.
  • View Repository

2. Shadow Mario: 2D Platformer Engine Java Game Dev OOD A feature-rich game engine built from scratch on top of the Bagel framework.

  • Highlight: Implemented AABB Collision Detection, Projectile Physics, and a polymorphic entity system.
  • Visuals: Features complex Boss AI logic and dynamic level parsing (CSV).
  • View Repository

Systems & High Performance

3. High-Performance Game AI Agent Python Algorithms Optimization An autonomous agent optimized for strict memory and time constraints.

  • Optimization: Engineered Bitboard representation (bitwise ops) and Zobrist Hashing ($O(1)$ lookup).
  • Algorithms: Implemented IDDFS, Alpha-Beta Pruning, and A Search* with a custom Backward-BFS heuristic.
  • View Repository

4. High-Performance HTTP Proxy C Network A multi-threaded HTTP/1.1 proxy server compliant with RFC 7230 standards.

  • Highlight: Engineered a custom LRU Caching Engine to cache web responses under strict memory constraints.
  • Features: Handles Dual-stack (IPv4/IPv6) networking and complex Cache-Control headers.
  • View Repository

5. Virtual Memory Management Simulator C Systems A hardware-level simulation of a Memory Management Unit (MMU).

  • Core: Implemented Hierarchical Page Tables and TLB with custom eviction policies.
  • View Repository

Full-Stack & Web

6. Academic Marker Moderation System React Node.js PostgreSQL A commercial-grade grading platform used by university staff.

  • Role: QA Lead & Full-Stack Developer.
  • Highlight: Designed the testing framework and engineered backend automation services.
  • View Repository

Technical Skills

  • Languages: Java (SE), C (C99), Python, JavaScript/TypeScript, SQL
  • Core Concepts: Design Patterns (GoF), Data Structures & Algorithms, OOD, Concurrency
  • Systems: Linux (Ubuntu), Docker, Git, TCP/IP, Valgrind, Bitwise Optimization
  • Web: React, Node.js, HTML5/CSS3

LinkedIn • Email

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  1. software-architecture-portfolio software-architecture-portfolio Public

    A showcase of advanced Object-Oriented Design (OOD) in Java. Demonstrates GoF Design Patterns (Strategy, Factory) and GRASP principles applied to legacy system refactoring and concurrent simulations.

    Java

  2. java-2d-platformer java-2d-platformer Public

    A modular 2D platformer game engine in Java. Features AABB collision detection, finite state machine AI, and entity polymorphism.

    Java

  3. high-perf-game-ai-agent high-perf-game-ai-agent Public

    High-performance autonomous game agent featuring Bitboard optimization, Zobrist Hashing, IDDFS, and A pathfinding

    Python

  4. virtual-memory-simulator virtual-memory-simulator Public

    A low-level MMU simulation in C, implementing hierarchical paging, demand paging, and a TLB with LRU eviction policy.

    C

  5. http-proxy-server-c http-proxy-server-c Public

    A robust HTTP/1.1 caching proxy server in C, implementing LRU eviction (Doubly Linked List), dual-stack sockets (IPv6/IPv4), and RFC-compliant header parsing.

    C

  6. Ricky042/MarkingApp Ricky042/MarkingApp Public

    a web application to allow for subject marker coordination

    JavaScript