Full-stack developer in Honolulu
Justin Sumiye
My interest in technology started at eight years old, experimenting with Scratch and programming LEGO robots.
What began as a hobby has grown into a passion for building software, solving problems, and exploring what’s possible with AI.
Things I've done
Experience
Practical Software · Full-stack software engineer
May 2025 – present
Remote
- Built and launched a client survey and reporting platform in 10 weeks; it now hosts 900+ surveys and 70,000+ responses. Writeup.
- Cut survey creation and reporting time by approximately 60% with reusable templates, question banks, automated legacy survey mapping, and a report builder.
- Added CORS controls, CSRF and XSS protections, and PDO prepared statements to PHP API endpoints backed by MySQL.
- Handled a production website migration from Plesk to cPanel, including the full MySQL database transfer.
- Converted web.config rules to Apache .htaccess and configured PHP settings and file permissions for the new hosting environment.
Korean Language Flagship Center · Web developer
Sep 2023 – present
University of Hawaiʻi at Mānoa · Honolulu, HI
- Built a PHP application to automate applicant decision letters and a React quiz used by 100+ students at Korean Culture Day.
- Improved page load speed by 50% through caching and file compression.
- Built application forms and a course simulation for a business-Korean class.
- Built and repaired PCs, replaced components, and diagnosed hardware and software issues.
Skills
Languages
JavaScript, TypeScript, PHP, Python, Java, C
Frameworks
React, Next.js, Flask
Libraries
Bootstrap, Material UI, jQuery, shadcn/ui
Databases
MySQL, SQL, Firebase
Servers
Vercel, Railway, Apache
Security
Linux CLI, Wireshark, Scapy, web application security
Tools
Git, GitHub, GitHub Actions, npm, Vite
Systems
Plesk, cPanel, web configs, PHP configuration, server logs, file permissions, WordPress, SFTP, PC repair
Honolulu