yarek chmielewski

Full-Stack Developer – Creation of the real-time chat system HTML5 (html5-chat.com)

Design and complete development of a real-time discussion platform, modern, scalable and full-HTML5, intended to be easily integrated into external websites.

I developed a real-time chat engine from A to Z based on Node.js, Socket.io, PHP (REST backend) and an optimized MySQL/MariaDB database for high-frequency polling. The objective was to offer a light, fast, cross-browser compatible system capable of handling thousands of simultaneous users.

On the server side, I designed a hybrid architecture:

Node.js real-time server for instant events (messages, statuses, online users).

PHP backend for administrative management, rooms, permissions, moderation, uploads, and WordPress integration.

Optimized MySQL (indexes, pagination, partitions) to support high read/write rates.

I developed a complete private messaging module, a multi-channel room system, an avatar engine (URL, base64), an intelligent anti-flood system, and fine-grained role management: guests, users, VIPs, moderators, and administrators. Everything is synchronized in real-time via Socket.io.

In parallel, I designed a responsive user interface in HTML5/CSS3/JS, with:

dynamic user list,

avatar display,

video panels/jsPanel,

emoji picker,

live notifications,

light/dark theme,

mobile optimization (iOS/Android).

I also developed a WordPress plugin to integrate the chat in a few clicks, with a complete administration interface: configuration, room management, bans, moderation, JSON translation, etc.

The entire project allowed me to acquire in-depth expertise in real-time chat systems, load management, SQL optimization, reactive HTML5 front-end, and multi-platform integration (SaaS + WordPress).

Full-Stack Developer – Specialization WebRTC & Real-Time Architectures

Complete development of a video conferencing solution for chat.com, including network engineering, real-time backend, and user interface.

I designed and developed a fully custom WebRTC architecture from scratch, enabling high-performance video and audio stream management. The system is based on Mediasoup, Node.js, and Socket.io, offering low-latency communication, optimized packet routing, and native scalability through a multi-core model.

I implemented an infrastructure capable of handling several thousand simultaneous connections, with advanced control over CPU workers, internal load balancing, and media pipelines (Simulcast, SVC, dynamic bandwidth management, real-time quality adaptation).

On the database side, I designed and administered an optimized MySQL environment, integrating indexing, stored procedures, replication, and data distribution to ensure maximum availability and perfect consistency under high load.

The backend is based on a custom-built event engine, managing all user interactions: rooms, permissions, messages, moderation, session states, WebRTC transitions, and global synchronization.

I also carried out the entire graphic design of the platform: webcam interfaces, responsive layouts, themes, animations, mobile/desktop ergonomics, as well as the overall visual identity of the site. Everything was designed to offer an immersive and fluid experience, even on low-power devices.

The entire project includes: advanced network management (TURN/STUN), real-time security (anti-flood, IP protection, permissions), live monitoring (latency, loss, CPU), stream optimization, and complete front-end integration.