# ADED

Portfolio record by Eugene Livschitz

Canonical page: https://livytech.space/projects/aded/

AI-assisted social marketplace

Full-stack social marketplace built around a simple user flow: create an advertisement from a photo or text and make it discoverable across languages.

## My contribution

Built marketplace workflows across React, Node.js, Express, MongoDB, identity, media, search, real-time messaging, seller tools, social features, and moderation operations.

## The hard part

Preserving a low-friction listing and discovery experience while handling multilingual intent, structured filters, embeddings, media uploads, guest continuity, and real-time seller communication.

## What shipped

- Built AI-assisted listing creation with structured suggestions, dynamic follow-up questions, media handling, and guest-to-authenticated continuity.
- Implemented multilingual hybrid discovery using query translation, intent analysis, structured filtering, embeddings, and MongoDB Atlas Vector Search.
- Built seller shopfronts, saved items, history, follows, subscriptions, notifications, moderation, and persistent translated buyer/seller chat.

## Technical details

- Socket.IO supports persistent conversations, unread state, delivery events, and translation preferences.
- Cognito and Amplify provide identity integration while S3 presigned flows handle marketplace media without routing large files through the application server.
- Product models support listings, shops, categories, discovery history, social relationships, notification state, reports, and moderation actions.

## Technology

React, TanStack Router, Node.js, Express, MongoDB, Socket.IO, OpenAI, Atlas Vector Search, Cognito, S3

[Visit ADED](https://www.aded.app)