f0lder

Full-Stack Developer & CTF Player

React.jsNext.jsPHPPythonRomania

About Me

Master's student in Computer Science with a passion for web development and cybersecurity. Specializing in creating modern web applications and participating in CTF competitions.

Experience in WordPress development, full-stack web applications, and security research. Active CTF player with notable achievements in CSCTF and USVCTF competitions.

Skills & Technologies

My technical toolkit and expertise

Languages

JavaScript/TypeScript

Python

PHP

C/C++

Development Frameworks

React/Next.js

Node.js/Express

WordPress

Infrastructure & Database

SQL/NoSQL Databases

Docker

Linux

Git

RESTful APIs

Cybersecurity

Web App Security

Penetration Testing

Reverse Engineering

Cryptography

Experience

Professional journey and work history

PHP Developer

DeosebIT Soft

2025 - Present

Bacau, Romania

Key Achievements:

• Creating custom WordPress themes and plugins

• Optimizing websites to reach 95+ on Google PageSpeed Insights

• Automated workflows using Python

• Interating APIs for e-invoicing, payment processing, and AWB generation

• Installing and configuring Linux servers for web hosting

• Extending CRM solutions to fit business needs

• Using Three.js for 3D product customization and visualization

Website Admin and Theme Developer

AR Medical Cosmetic

2022 - 2025

Remote

Key Achievements:

• Maintained and optimized website performance

• Created custom WordPress theme with WooCommerce integration

• Implemented Docker containers for deployment

Featured Projects

A selection of my recent work and contributions

Fuzzy Trafic Light Simulationhttps://github.com/f0lder/tk

Fuzzy Trafic Light Simulation

fuzzypython

WP storehttps://armedicalcosmetic.ro/

Woocommerce store with custom theme and plugins

Workshop management apphttps://www.mimesiss.ro/

Workshops management app with user registration and Stripe payments

Schedule Apphttps://orar.f0lder.xyz/

Schedule CRUD web app written in ExpressJS. Database is MonogDB (using mongoose package)

ExpressPug

Poo Project - DB Administration apphttps://github.com/f0lder/ProiectPOO

Database Administration App. Made in MFC

MFCC++

Guess the game clonehttps://guess.f0lder.xyz/

Guess the game clone written in NextJS. Using a public DataBase for fetching images of games. Live demo available at the link above. Slow loading due to free server.

ReactAPI

Portofoliohttps://f0lder.xyz/

This portofolio made using NextJS, React and DaisyUI

NextJSReact

Unity Simulation of a Robot that plays Tic Tac Toe

Computer vision system for playing Tic Tac Toe and sending information to Unity and RoboDK

UnityRoboDKOpenCV

Achievements

CTF competitions

USV-CTF 2025

The Codefathers

12th Place

CSCTF 2025

The Codefathers

6th Place

CSCTF 2024

The Codefathers

3rd Place

USV-CTF 2023

The Codefathers

6th Place

HackITAll

The Codefathers

Finals

USV-CTF 2024

The Codefathers

Participation

f0lder

About Me

Master's student in Computer Science with a passion for web development and cybersecurity. Specializing in creating modern web applications and participating in CTF competitions.

Experience in WordPress development, full-stack web applications, and security research. Active CTF player with notable achievements in CSCTF and USVCTF competitions.