Hi, I'm Antonius Sebastian
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I craft clean, modern web applications using JavaScript, TypeScript, and open-source technologies. I'm passionate about learning, building, and solving real-world problems through code.
Who I Am
A Passionate Developer
I'm a passionate software developer with strong foundations in web technologies, algorithms, and clean coding practices. My journey started with online courses like Angela Yu's Web Development Bootcamp and Harvard's CS50, which ignited my passion for creating impactful software.
I proudly represented Universitas Indonesia in the Huawei ICT Competition and won 2nd place at the national level. Beyond competitions, I stay active in tech communities such as Komandro CCIT FTUI, CSS, GDGoC UI, and have volunteered at AWS Community Day.
I enjoy building things that matter, whether it's personal projects, organizational tools, or collaborative web applications. I'm always seeking to improve my craft and contribute to something meaningful.
Problem Solver
I enjoy breaking down complex problems and building clean, scalable solutions.
Team-Oriented
I thrive in collaborative environments through experience in organizations and tech events.
Continuous Learner
Always expanding my skill set through courses, projects, and community involvement.
Technical Expertise
Programming Languages
Languages I've used for software development and problem solving
Engineering Concepts
Foundational knowledge from coursework and competitive programming
Frontend Development
Tools and frameworks for creating interactive, responsive UI
Backend Development
Building robust APIs and server-side applications
Database Systems
Experience with relational and NoSQL databases
Development Tools
Tools I use for development, collaboration, and deployment
I work primarily with modern web development stacks and have experience with backend systems, databases, and foundational computer science concepts.
Featured Projects

Store API
A RESTful API for managing products, users, authentication, and orders in an e-commerce system.

Blog-Hub
A modern blog platform with user authentication and content management features.

Attendance Management System
An Android-based QR code attendance tracking system for events.

Euphoria - E-commerce UI/UX
A fully responsive UI/UX design for a clothing store website built with React.

Subscription Management API
A production-ready API handling users, payments, and business logic for subscription services.

Apple iPhone 15 Pro Clone
A high-fidelity Apple iPhone 15 Pro clone with 3D animations and interactive elements.
Certificates

Harvard CS50x
Completed CS50x, including ten problem sets and one final project. Awarded from Cambridge, Massachusetts.

Huawei ICT Competition
2nd Winner in Computing Track at Huawei ICT Competition 2024-2025 National Final.

COMPFEST 16
Participant of Senior Competitive Programming Contest at COMPFEST 16.

AWS Community Day Indonesia
Volunteer at AWS Community Day Indonesia 2024, contributing to uniting developers and elevating innovation with AWS.

Komandro CCIT FTUI
3rd place winner in the Database competition at Komandro Brilliant Youthful Tech-Savvy Enthusiastic event.

Web Development Bootcamp
Completed The Complete 2024 Web Development Bootcamp by Dr. Angela Yu (61.5 total hours).