I have built front ends, back ends and deployments, and I am extending that experience into networking and security.
Service developmentJava · Spring Boot · React · TypeScript · Flask · MySQL · PostgreSQL · REST API
Authentication & securityJWT · OAuth · Argon2id · WebAuthn passkeys · Graylog · n8n alerts
NetworkingVLAN · Routing · ACL · pfSense
Research & dataPython · scikit-learn · XGBoost · SHAP
Testing & deliveryPlaywright · Vitest · GitHub Actions · Docker · Nginx · Ubuntu
RolePlanning · Front-end implementation · User observation · Validation · Deployment
Scope15 reading rules, conclusion card, paper lab, six user sessions, reproducible ZIP, GitHub Pages
ResultA fellow trainee reached the vendor questions on a phone unaided; 187 tests gate every deploy.
StackReact 19 · TypeScript · Vite 8 · Vitest · Playwright
RoleTeam lead · Full-stack developer · Team of four
ScopeService architecture, React UI and Spring Boot API, deployment on Ubuntu, Docker, Nginx and HTTPS, issue tracking and code review
ResultBy August 4, 2026 the team logged 152 issues and 266 pull requests (72 reviewed by me) and served the app over HTTPS.
StackReact · Spring Boot · Docker · Nginx · OAuth
RoleResearch design · Implementation · Validation · Paper writing
ScopeResearch design, data audit, three-model comparison, SHAP stability checks, paper and reproducible materials
ResultSubmitted a paper with reproducible materials: XGBoost Macro F1 fell from 0.9979 to 0.3871.
StackPython · scikit-learn · XGBoost · SHAP
RoleWebAuthn authentication design · Implementation · Validation · Deployment
ScopeWebAuthn registration and sign-in, session, Origin and CSRF checks, database, public deployment
ResultMet all 47 acceptance criteria and passed 50 tests; zero password fields on public pages, 401 for private requests without a session.
StackJava 25 · Spring Boot · WebAuthn4J · PostgreSQL · Vercel
ResultPassed 319 back-end and 76 front-end tests, with request/response evidence that access to other accounts' data and reused tokens are rejected.
Try the service (slow first load)Authentication guidePublic repository
ResultPassed 45 tests; a 35,033-packet SYN flood from Kali reached Graylog, n8n, three messengers and the board log.
ResultServerless build that passed 291 tests; playable from a link with no install or sign-in.
InstitutionKorea AI Academy, Busan
DetailsJava, Spring Boot and React full-stack development and applied generative AI, with a team project using MySQL, REST APIs, JWT/OAuth2, Git/GitHub, Docker and Nginx.