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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 system efficiency (C/C++) and high-level full-stack delivery (Node.js/React/Java). Passionate about writing clean, testable code and architecting scalable backend systems.

Featured Projects

1. Academic Marker Moderation System React Node.js PostgreSQL

A commercial-grade grading platform used by university staff (University Capstone / Team Repo).

  • Role: Full-Stack Developer (Client Project).
  • Highlight: Migrated full-stack to AWS — provisioning RDS, S3, SES (DKIM/DMARC via Route 53), Amplify with CI/CD, and EC2 with PM2. Engineered secure RESTful APIs with JWT-based RBAC and bcrypt password hashing.
  • View Repository

2. Autonomous Drone Delivery Simulation Engine Java Gradle Simulation

A cloud-native simulation engine deployed on AWS ECS Fargate, featuring an Apache Kafka event-driven telemetry pipeline, OpenAI GPT-4o-mini business insights integration, and a React/TypeScript dashboard with real-time SSE visualisation.

  • Key Tech: Java, Spring Boot, Apache Kafka, AWS ECS Fargate, Docker, OpenAI API, React, TypeScript
  • Highlight: Replaced in-memory telemetry with Kafka (Amazon MSK in production) via pluggable @Profile-activated implementations; deployed with multi-stage Docker build, ECR, and CloudWatch logging.
  • View Repository

3. HTTP Caching Proxy Service C Network

A HTTP/1.1 caching proxy server implemented in C with manual header parsing and dual-stack networking support.

  • Key Tech: C (C99), BSD Sockets, Manual Memory Management, Dual-stack (IPv4/IPv6).
  • Highlight: Engineered a custom LRU caching engine to cache HTTP responses under strict memory limits, respecting complex Cache-Control directives.
  • View Repository

4. Bitboard-Optimized Adversarial AI Engine Python Algorithms Optimization

An autonomous agent optimized for strict memory and time constraints.

  • Key Tech: Python, Bitwise Operations, IDDFS, Alpha-Beta Pruning.
  • Highlight: Engineered Bitboard representation and Zobrist Hashing for $O(1)$ state lookups, achieving highly efficient adaptive time management.
  • View Repository

5. Virtual Memory Management Simulator C Systems

A hardware-level simulation of a Memory Management Unit (MMU).

  • Key Tech: C, Operating Systems Concepts, Memory Management.
  • Highlight: Implemented Hierarchical Page Tables and a Translation Lookaside Buffer (TLB) with custom LRU eviction policies.
  • View Repository

6. Shadow Mario: 2D Platformer Engine Java Game Dev OOD

A feature-rich game engine built from scratch on top of the Bagel framework.

  • Key Tech: Java, Object-Oriented Design (OOD), CSV Parsing.
  • Highlight: Implemented AABB collision detection, projectile physics, and a polymorphic entity system featuring complex Boss AI logic.
  • 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. Ricky042/MarkingApp Ricky042/MarkingApp Public

    A production-deployed full-stack web application for managing university marking workflows. Built to handle the coordination overhead between markers, subject coordinators, and students — rubric co…

    JavaScript 1 1

  2. 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

  3. 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

  4. Bitboard-Optimized-Adversarial-AI-Engine Bitboard-Optimized-Adversarial-AI-Engine Public

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

    Python

  5. 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

  6. 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