CHANG JUI-HSUAN (張睿玹)

With 4+ years of full-stack development and operations experience, I specialize in React and Laravel, with a strong background in website maintenance and cybersecurity.

I have participated in numerous projects and frequently work on side projects, building robust infrastructures and secure servers.

I also founded and led tech clubs, organizing workshops to enhance technical skills. Passionate about new technologies, I focus on network and information security to ensure stable and secure deployments.


  HsinChu, Taiwan  https://hsuan.app          [email protected] / 0905413295

Education

2023/09 - 2026/06

National Tsing Hua University

Department of Computer Science

2020 - 2022

National Tainan First Senior High School

High School

Working Experience

Full-Stack, App, and Server Operations Chief Engineer  •  AllRoundTW LLC (台灣全方位國際科技)

Oct 2023 - Jul 2024

  • Developed AllRound CourseWeb (全方位課程平台): Built a course platform using Next.js, Laravel, and Firebase for long-term care staff to earn certifications, serving over 500 users. Integrated a Docker-based sandbox for secure, interactive training. Enhanced system performance with job queueing and multiprocess execution for efficient concurrent evaluations.

  • Developed AllRound CarePro App (全方位照護): Created a cross-platform app with React Native (Expo) and Laravel, linking caregivers and clients in long-term care. Overcame challenges in matching algorithm optimization for effective pairings. The app serves over 100 users, ensuring secure, seamless interactions.

  • Established Comprehensive Network Environment: Deployed web services using Windows AD, DNS, DHCP, and Ubuntu with Docker. Streamlined remote operations with iDRAC. Implemented HA strategies with DNS and VM failover. Managed VPN setups and oversaw Cisco  and VyOS routers for reliable network performance. Integrated NAS with Active Directory and deployed Minio for S3 storage, supporting internal projects.

  • Utilized Colo and IP Transit Providers for BGP Connection: Successfully deployed the company’s ASN and /23 public IP range, ensuring an extensive IP allocation that eliminated the need for multi-port NAT on individual VMs, thereby streamlining traffic management and resource allocation.

Final Project Planning Teaching Assistant  •  NTHU Department of Computer Science Introduction to Programming (II) Course

Feb 2024 - Jun 2024

Assisted in planning and constructing the final project for the freshman mandatory programming course in the Department of Computer Science.

Chief Technology Officer  •  FillCast

Nov 2022 - May 2024

FillCast is an award-winning team from NTHU Garage. Within the team, I have assisted in building a complete infrastructure and backend applications.

Skill

  • Full-stack development (React, Laravel, Next.js)
  • Mobile app development (React Native, Expo)
  • Containerization and orchestration (Docker)
  • Server and infrastructure setup (iDRAC, Virtualization)
  • Network management (Cisco, Windows AD)
  • Cybersecurity (CVE reporting, participated in AIS3 for 3 times, AIS3 refers to the Advanced Information Security Summer School in Taiwan)
  • Database management (MySQL, Firebase)

Research

  • A Study on Enhancing Database Security through Cryptography (以密碼學增強資料庫安全性之研究) @ TANET 2021, TW, ROC

  • Design of a Course System with Multi-File Assessment and Virtual Machine Setup for Target Practice (具有多檔案評測及虛擬靶機建置之課程系統) @ TANET 2023, TW, ROC

Other Experiences

National TsingHua University Tech Society (資訊科學研習社)  •  Founder & Vice President

  • Established the first information technology-focused club in the school.
  • Organized over 10 lectures/workshops, with a total membership of nearly 150 members.

National TsingHua University BlockChain Club  •  Founder & President

  • Pioneered the first blockchain club in the school, leading the trend in blockchain and quantitative trading research on campus.
  • Organized over 8 lectures/workshops, with a total membership of nearly 50 members.

NTHU GDSC (Google Developer Group On Campus) 2024' - 2025'  •  Lead

  • Guided school’s GDSC members in project-based learning, covering interdisciplinary knowledge such as web development, blockchain, and rendering.

Student Association, Department of Computer Science, National Tsing Hua University  •  Teaching Division, CSST 

  • Organized multiple foundational knowledge lectures for students, also served as a speaker for two of these lectures.

2023 IONCamp (清大暑期程式競賽集訓營)  •  Deputy Coordinator

  • Coordinated a five-day camp providing competitive programming instruction to over 80 participants.

2022-2025 WebCamp (清大網站維運實務集訓營)  •  Permanent Chief Coordinator

  • Organized the camp for four consecutive times, offering participants professional training from frontend to backend development and server maintenance.

2023 Ministry of Education AIS3 Club (資安幹部訓練營)  •  Chief Coordinator

  • A sub-project under the Ministry of Education's AIS3 Cybersecurity Talent Cultivation Program, aimed at promoting exchanges among cybersecurity clubs across Taiwan.

Reported CVE (Common Vulnerabilities and Exposures)

  • 9.8 (Critical) CVE-2021-41566 Tad TadTools - Arbitrary File Upload
  • 9.1 (Critical) CVE-2021-41974 TadBook3 - Improper Authorization
  • 7.5 (High) CVE-2021-41975 TadTools - Improper Authorization
  • 6.1 (Medium) CVE-2021-41563 Tad Book3 - Stored XSS
  • 6.1 (Medium) CVE-2021-41565 Tad TadTools - Reflected XSS
  • 6.1 (Medium) CVE-2021-41567 Tad Uploader - Stored XSS
  • 5.3 (Medium) CVE-2021-41564 Tad Honor - Improper Authorization
  • 5.3 (Medium) CVE-2021-41568 Tad Web - Improper Authorization
  • 5.3 (Medium) CVE-2021-41976 Tad Uploader - Improper Authorization

Projects

Tainan First High School Online Ordering System 

Full Stack Web Project  •  2021 - 2022

AllRound CourseWeb (全方位課程平台)

Full Stack Web Project  •  2023 - 2024

  • Initially developed as a side project, later adapted and expanded to become a core platform at AllRoundTW LLC as the company ventured into the long-term care education industry.
  • Enhanced the platform to enable caregivers to watch instructional videos online and earn government-recognized long-term care credits.
  • Implemented Job Queue and multiprocess execution to handle high volumes of concurrent evaluations, optimizing system performance and preventing bottlenecks.
  • Utilized Docker to run the judging environment, providing lightweight, isolated containers for each submitter to enhance security and support diverse training scenarios. Users could interact in the container environment and execute scripts for automated evaluation.
  • Implemented CI/CD pipelines to streamline deployment, ensuring updates were automatically applied with each git push, facilitating continuous delivery and maintenance.
  • Used in courses and workshops such as CSST Linux training, NTHU GDSC, the IT club I founded (清資社), and web development camps I organized. The platform allowed students to review class videos, submit assignments, and served as a comprehensive evaluation tool for programming, cybersecurity, and network management training.
  • Employed Next.js, Laravel, and Firebase for the development of a robust and scalable system, including SSO integration for seamless user data synchronization across related platforms.


College Admission Analysis Platform 

Full Stack Web Project  •  2021 - 2022

  • Created as a side project after being admitted to college through a special admissions process （特殊選材）, aimed at assisting classmates with university placement analysis during entrance exam season.
  • Utilized previous years’ data and web scraping techniques to compile and transform data for comparison.
  • Developed a system to map current exam scores against past results, predicting university admission possibilities.
  • Attracted over 1,000 users within a single month during peak traffic, providing valuable insights for students' decision-making.


Blockchain Club Administrative System

Full Stack Web Project  •  2024 - Present

  • Developed during my tenure as the founder of NTHU Blockchain Club and as the lead of NTHU GDSC.

  • Built a comprehensive platform to support club operations and member management.

  • Assisted in organizing over 8 major events and managed data for over 100 members, including partner societies.

  • Developed and maintained systems for:

    • Mailing: Automated communication with club members.
    • Document Workflow: Streamlined internal document handling.
    • Event Registration: Simplified event sign-ups.
    • Check-in/Check-out: Tracked attendance efficiently.
  • Enhanced the club's administrative efficiency and member engagement through robust web solutions.


Established the Company’s Comprehensive Network Environment

Infrastructure Project at AllRoundTW LLC  •  2023 - 2024

  • Virtualization Deployment: Leveraged Windows AD, DNS Server, DHCP, and Ubuntu to deploy and maintain web services and containerized applications.
  • Containerization: Utilized Docker for running containerized applications, ensuring efficient resource management and consistent environments.
  • Remote Operations: Employed iDRAC for remote monitoring and deployment, streamlining server management tasks.
  • High Availability (HA): Implemented HA strategies with failover mechanisms in DNS and virtual machines to enhance system resilience and minimize downtime.
  • VPN and Network Management: Managed and optimized VPN configurations using WireGuard and Fortinet IPSec/SSL VPN to ensure secure remote access and communication. Oversaw enterprise network infrastructure using Cisco and VyOS routers, boosting network reliability and security. Configured source and destination NAT to facilitate efficient routing and address translation, enhancing network flexibility and resource management.
  • Data Storage Integration: Integrated NAS with Active Directory for seamless user authentication and data access, and deployed Minio for S3-compatible storage solutions.
  • Server and Storage Procurement: Assisted in procuring DELL PowerEdge servers and MD1400 DAS (Direct-Attached Storage) units, enhancing the company’s infrastructure capabilities.
  • Network Expansion: Utilized Colo and IP Transit Providers for BGP connection, successfully deploying the company’s ASN and /23 public IP range, ensuring extensive IP allocation. This setup eliminated the need for multi-port NAT on individual VMs, streamlining traffic management and optimizing resource allocation.
  • Infrastructure Support: Provided robust support for internal projects through efficient server and storage configurations, ensuring scalable and secure operations.


AllRound CarePro App (全方位照護)

Full Stack App Project  •  2024 - Present

  • Developed as an engineer at AllRoundTW LLC, contributing to the company's caregiving service platform.
  • Developed a cross-platform app using React Native with Expo and Laravel for the backend.
  • Integrated Firebase SSO to connect with the AllRound CourseWeb platform, enabling seamless user data synchronization and eliminating duplicate profile creation.
  • Implemented Google OAuth and gained experience in advanced Firebase integration.
  • Designed and optimized a backend matching algorithm to pair users based on attributes and overlapping availability, ensuring efficient caregiver-client connections.
  • Overcame challenges in algorithm optimization to enhance match accuracy and system reliability.
  • Launched on the Appstore, supporting over 100 users and improving service accessibility.


Remote-controlled car with Xilinx Basys3

Verilog + ESP32 + App Project  •  2023 Hardware Design

  • Developed a remote-controlled car platform on Xilinx Basys3 using a MicroBlaze soft processor, Verilog logic, and integrated Pmod ESP32 module for wireless communication.
  • Implemented mobile app-based command input via a dedicated C2 server, enabling real-time remote operation through Wi-Fi.
  • Designed the FPGA system using AXI Interconnect, GPIO for motor/LED control, and UART for debugging, ensuring a clean, modular hardware-software integration.
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