William Sebastian

An admin page designed to manage day-to-day operational of my startup, Aksara Singularity Indonesia.

A hospitality and lifestyle site showcasing Candhari Heaven in Yogyakarta, Indonesia. It highlights its restaurant, villa accommodations, and event spaces, while providing visitors with galleries, promotions, and contact information. Designed to convey serenity and scenic beauty, it positions Candhari Heaven as a destination for dining, retreats, and celebrations.

Full-fledged Enterprise Resource Planning system that supports managing supplier & customer relationship, purchasing and invoicing, a thorough search, filter, and sorting feature, to a thorough reporting feature.

A stock control and portal management page for IRONFIT INDONESIA that centralizes operational and financial data. Designed for clarity and efficiency, it enables administrators to monitor transactions and manage operations in a streamlined system.

Customized Enterprise Resource Planning system for IRONFIT INDONESIA that manages supplier & customer relationship, purchasing and invoicing, and thorough inventory management features.

An e‑commerce platform tailored for fitness business, showcasing professional gym equipment with dynamic pricing and promotional offers. It is designed for resellers and partners to easily place orders through a modern, user-friendly catalog.

Made for Information Technology Creative Competition (ITCC). It is the largest competition in the field of Information Technology in Bali, which is organized by the Information Technology Student Association (HMTI) of Udayana University. KelasCoding is a structured e‑learning platform designed to provide accessible, self‑paced courses in web development and programming. The site features clear navigation, subscription options, and dedicated class pages covering topics such as HTML/CSS, PHP, and C++. It emphasizes usability and scalability, offering learners a straightforward way to explore, purchase, and engage with technical content online.

An AI‑driven travel booking platform that replaces traditional price comparison with a conversational interface. Instead of browsing endless hotel or flight listings, users interact through a chat system where the AI suggests curated options based on availability and preferences. This design streamlines decision‑making, offering a modern, intuitive alternative to conventional booking experiences.

A corporate site for Maguro Machinery Indonesia, presenting industrial equipment solutions and company information. The platform highlights product categories, technical specifications, and service offerings, while providing clear navigation to company background, contact details, and client resources. Designed for business accessibility, it functions as both a product showcase and a professional information hub for industrial clients.

A podcast platform designed to host and stream audio episodes with a clean, user‑friendly interface. Highlights individual shows with clear playback controls and episode details, offering listeners an accessible way to discover and engage with content. This site was made for a university course project, and I thought, why not make my website accessible via its own platform?

A boutique hotel management platform that centralizes guest, room, and asset data in a streamlined dashboard. The interface provides quick access to key metrics such as total guests, available rooms, and property assets, while integrating links to social media and the hotel’s official website. Designed for clarity and efficiency, it supports administrators in monitoring operations and maintaining a professional digital presence.

An app to randomize student seats in class. With modifiable tables and student count. Made when I was a freshman back in highschool.

Autonomous restaurant waiter with RAG capability that is tuned to make it accurate and fast. For the showcase, please watch the video above.

Philipiness' GQ Shop Shift Management System.

Online Sales Catalogue for PT. ASTRA INTERNATIONAL Tbk. - Toyota Sales Operation Pasar Kemis branch.

Made with Adobe Animate, this is a final project for my Traditional Chinese Medicine course at NTUST. I decided to make an interactive report to stand out.

Initially built for a course in NTUST, this WebRTC-based Streaming Platform is designed for simple and fast streaming. It is Intuitive and easy to use without any cluttering features and a built-in LLM-powered chat moderation ensures your stream stays positive.

WXST is developed during my part-time job in CATCHPLAY to help me work faster. It is a subtitle processing tool that allows users to upload .srt or .vtt files and apply automated text cleanup. Features include capitalization fixes, removal of sound effect tags, stripping of HTML markup, and replacement of forbidden symbols. Designed for efficiency, this platform does its job and nothing else.