Portfolio · Vietnam
Informatics student interested in algorithms and computer systems.
I enjoy competitive programming and build tools that help students learn and practise Informatics.
Informatics specialization · Quang Nam · 2024–2027
Founded and operate K23OJ, a customized online judge built on the VNOJ/DMOJ ecosystem to help students practice Competitive Programming. It supports 60+ students and has processed 2,600+ submissions across a collection of 2,000+ problems.
Led technical operations for 60 contestants, increased each lab’s capacity by 50%, and recovered all contestant source code during a malware incident.
Authored algorithmic problems, test cases, and editorials for the online edition of the competition.
Maintained 500+ C++ solutions covering graph theory, dynamic programming, and advanced data structures.
View repository ↗Additional systems project: I also host and maintain a public Ookla Speedtest server, supporting 8,000+ network tests each month.
Observed enterprise network and server infrastructure during a month-long placement, studying network topology, high-availability and backup systems, VMware ESXi virtualization, and infrastructure monitoring.
Identified and responsibly reported a client-side data exposure issue that revealed exam content and Listening transcripts at match start. Proposed server-side state management, data minimization, and submission validation; the report was acknowledged by the product’s technical lead.
Additional honors: Honorable Mentions at the Hue-ICT Challenge and Quang Nam Provincial Informatics Olympiad; ranked 31 / 148 at the Da Nang City Informatics Olympiad.
Academic interests