Artem Tatur

Implemented the CoinMarketCap platform: collecting quotes from exchanges, coin and exchange ratings, market analytics, a public API, admin panel, and SEO.

Data Collection and Processing

— Configured price collection from crypto exchanges (Binance, Coinbase, OKX, etc.) via REST and WebSocket: failure retry, API overload protection

— ​​Unified ticker appearance (BTC, BTCUSDT, XBT — one coin), pair whitelists and blacklists

— Chain: message queue → background workers → PostgreSQL + Redis cache

— Calculated average price, market cap, total market cap, and supply volumes

— Stored candlestick history and downloaded additional data when adding a new pair

Cryptocurrencies — Coin Rating

— Main table: position, price, 1h/24h/7d/30d change, market cap, daily volume, 7-day mini-chart

— Sections: "Trending," "Rise/Low," "Recently Added," categories, blockchain filter

— Coin Page: Description, contracts, trading links, price charts — Favorites and price notifications (email, Telegram)

— Spot exchange rankings: 24h volume, liquidity, traffic, number of markets and coins, fiat, 7-day chart

— Separate tables: spot, derivatives, DEX

— Volume reliability assessment, fraud prevention

— ​​Exchange page with a list of pairs and liquidity

— Market and indicators

— Market overview: total capitalization, daily volume, Bitcoin and Ethereum share

— Fear and Greed indices, altcoin season

— Derivatives: funding rates, liquidations

— Crypto-fiat converter

API and widgets

— Public API (FastAPI): coin lists, quotes, candlesticks, exchange rankings

— API keys, rates, request limits, usage tracking

— Swagger, test circuit, webhooks for partners

— Embeddable widgets for other sites

Interface

— Live update of the top 100 via WebSocket without Reloads

— Alerts for outdated quotes

— SEO, sitemap, Docker, CI/CD, nightly rating recalculations, S3/CDN

Stack: Python, FastAPI, Celery, PostgreSQL, Redis, Kafka, WebSocket, Next.js, React, Docker, Nginx, Prometheus, Sentry

Modern tools for creating and supporting mass formats for learning and development in the fields of modern science and technology

— Implemented a page builder (TiptapEditor) for dynamic website construction within the platform (implemented using Tiptap, which allowed for integration with external styles, table construction, and code highlighting)

— Rewrote legacy work left by a full-stack developer

— Wrote a custom UI

— Implemented a feature within the platform that allows changing Open Grath tags and immediately seeing how they will appear in messengers

— Implemented a major rework of the module builder, which accelerated and simplified the assembly of training materials by 3.5 times

— Developed an admin panel where the super admin can configure domains

— Implemented a window that monitors farm metrics in real time and displays them in graphs.

— LLM API integration: checking test and homework responses, providing feedback.

— Coordinated the creation of a new content block where users could select "multypart-content" or "test." When selecting a test admin, they filled out questions and provided the correct answers for the test.

— Assembled a CRUD API for learning entities (modules, lessons, content blocks, tests).

— Moved frequently accessed data (pages/modules/domain settings) to Redis.

— Implemented a real-time "farm" metrics stream (WebSocket/SSE + aggregation).

— Configured background Cron tasks (reminders, statistics recalculation, cache cleaning).

— Added centralized error handling and admin action auditing.

— Containerized the backend and environments (Docker + Portainer + Ubuntu).

— Wrote documentation for the entire project.

— Worked closely with Pixi.js to implement game-based learning. Form

— Backend and integrations (including by area of ​​responsibility): Express, PostgreSQL, Sequelize, REST, JWT, Redis—standard training entities, authorization, cache; Node.js in conjunction with the frontend.

— Infrastructure: Docker, Cron, Portainer, Ubuntu.

CRM development from scratch: funnels, deals, contacts, tasks, automation, reports, multi-tenancy.

— Designed the CRM architecture: leads, deals, contacts, companies, tasks, pipelines, activities, custom fields

— Implemented sales funnels: stages, drag-and-drop Kanban, mandatory fields in status, rejection reasons, tags

— Created a deal card: contact, company, budget, responsible person, activity history, attachments, comments

— Contacts and companies module: email/phone deduplication, CSV/Excel import, bulk operations

— Tasks and calendar: deadlines, reminders, deal linking, SLA, and overdue reports

— Automation (rules engine): stage change → task, notification, responsible person change, webhook

— Website lead acquisition: forms, UTM, funnel distribution, duplicate protection

— ​​Payments: invoice + webhook → deal stage → timeline → manager notification

— ​​Telephony and email: events in the activity feed Cards

— RBAC: owner / admin / manager / viewer, access by pipeline, "only your deals" — Custom field builder (text, select, date, money) for deals and contacts

— Analytics: conversion, revenue by manager, deal cycle, pipeline (Chart.js + ETL in PostgreSQL)

— Queues and Cron: bulk import, nightly reports, reminders, newsletters

— REST API + Swagger for external integrations