Harold Li

Hangjun (Harold) LIFull Stack Developer

Experienced in frontend, backend, cybersecurity, and machine learning technologies.

Email

contact@zttofficial.com

Phone

1-(226)501-6897

GitHub

@zttofficial

Location

Toronto, ON, Canada

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Work Experience

My professional journey in the tech industry.

Full Stack Engineer

Djade
Toronto, ON, Canada (Hybrid)
Mar 2025 - Present

Skills Used

Full Stack DevelopmentWeb TechnologiesTeam Collaboration

Adjunct Professor

Marquette University
Seasonal
Jan 2025 - Present

Skills Used

TeachingCurriculum DevelopmentMentoringComputer Science

Translation Consultant

Telegram Messenger
Remote
Nov 2022 - Present

Skills Used

TranslationTechnical TranslationBlockchainEditingEnglish TranslationProofreading

Linguistic Editor

DeepL
Remote (Freelance)
Jun 2023 - Present

Skills Used

TranslationEditingProofreadingAILinguisticsQuality Assurance

Senior Frontend Developer

Creative Catalyst CREA
Remote
Jul 2024 - Present

Skills Used

Vue.jsNext.jsTypeScriptReactTailwind CSSViteWeb3

Application Coordinator

Elite Alliance Services Inc.
Toronto, ON
Sep 2023 - Mar 2025

Skills Used

Zoom APISEOAI IntegrationZoho CRMData Privacy

Education

My academic background and qualifications.

Doctor of Philosophy - PhD

Universidad de San Miguel
Mexico
2023 - 2025

Graduate Diploma in Communications Engineering

Memorial University of Newfoundland
Canada
09/2023 - 08/2024

Master of Cybersecurity and Threat Intelligence

University of Guelph
Canada
09/2022 - 08/2023

Bachelor of Science in Computing (Enterprise Information Systems)

Macao Polytechnic University
Macao SAR
09/2017 - 06/2021

Publications

My research contributions and translation work.

Model Optimization for Stock Market Prediction using Multiple Labelling Techniques

H. Li, Y. Cao, X. Yang and Y. Wang

IEEE 13th International Conference on Software Engineering and Service Science (ICSESS), 2022

DOI: 10.1109/ICSESS54813.2022.9930328

View Publication

Projects & Practical Experience

A selection of my recent work and personal projects.

WearOS APP 'Classic Yellow Bear Watch Face'
WearOS APP 'Classic Yellow Bear Watch Face'
Published on Google Play, a custom watch face for WearOS devices featuring a cute yellow bear design.
July 2024
WearOS
Android
Kotlin
Google Play
Live Demo
Crack leaked password database Cybersecurity Program
Crack leaked password database Cybersecurity Program
Completed a cybersecurity program with Goldman Sachs on Forage, focusing on password security and database vulnerabilities.
January 2021
Cybersecurity
Password Cracking
Database Security
Python
Code
Szechwanese Lexicon APP
Szechwanese Lexicon APP
Pioneering design of an app for Szechwanese dialect, published on Google Play. Helps users learn and understand this regional Chinese dialect.
September 2020
Android
Java
Linguistics
Google Play
CodeLive Demo
Concise Translate APP
Concise Translate APP
Designed an Android Translation APP that has been published on Google Play. Offers a clean, minimalist interface for quick translations.
May 2019
Android
Java
Translation API
Google Play
CodeLive Demo
View All Projects

Activities & Certificates

Professional certifications and activities.

Agile Practitioner Certification

Agile Alliance

October 2023

ISC2 Candidate Certification

ISC2

October 2023

Institution of Engineering and Technology (IET) Chartered Engineer Candidate

IET

June 2021

Google Analytics Individual Qualification

Google

October 2020

Student Member in The Institution of Engineering and Technology (IET)

IET

October 2017 - August 2021

Organizations

Professional affiliations and leadership roles.

Macao Research Society of Dialect in Greater China

Co-Founder

May 2019 - Present

Zenith Talent Tenable

Chairperson

Jan 2005 - Present

Institution of Engineering and Technology

Student Member

Oct 2017 - Oct 2021

Macao Polytechnic University Mandarin Debating Team

Member

Associated with Macao Polytechnic University

Oct 2017 - Jan 2021

Volunteering

Community service and volunteer activities.

Volunteer

Amnesty International
2020 - Present
  • Supporting human rights campaigns and initiatives
  • Participating in awareness-raising activities

Volunteer

Associação de Juventude Voluntária de MacauSocial Services
2018 - 2021
  • Providing assistance to underprivileged communities
  • Organizing community service events

Volunteer Teacher

The Macao Association of Teachers VolunteersEducation
2019 - 2020
  • Teaching English to disadvantaged students
  • Developing educational materials and activities