Artem

ABOUT ME
I am a Senior Software Engineer with 15+ years of experience building APIs, real-time services, and high-load systems. I work across the full stack: backend (Node.js / Nest.js, Python, PHP), frontend (Next.js, Svelte, React, Vue.js, Angular), and Web3 (Solidity, EVM). I have experience designing REST and WebSocket APIs, event-driven architecture with BullMQ and RabbitMQ, and working with PostgreSQL, MySQL, and Redis. I develop Solidity smart contracts, trading bots, and automated market-making systems, and build Telegram bots, scrapers, and AI agents. I also orchestrate purpose-built AI agents (Claude, GitHub Copilot) as part of my development workflow to speed up delivery, as I did while building LandingCreator.
TECHNICAL SKILLS

Languages
Node.js / TypeScript, Python, JavaScript, PHP, Solidity
Backend
Nest.js, REST API, WebSockets, BullMQ, RabbitMQ, Symfony, Laravel, Yii
Frontend
Next.js, Svelte, React, Vue.js, Angular, TypeScript, HTML5, CSS3
Databases
PostgreSQL, MySQL, Redis, SQL
Web3 / Blockchain
Solidity, EVM, JSON-RPC, Smart Contracts, Automated Market Making
CMS / E-commerce
WordPress, 1C-Bitrix, OpenCart, PrestaShop
Infrastructure
Docker, Docker Compose, Git / GitHub, CI/CD, Unix/Linux
AI / Automation
Claude API, ChatGPT, GitHub Copilot, AI Agents, Telegram Bots, Web Scraping
WORK EXPERIENCE
Software Engineer | Freelance — RemoteMay 2023 — Present
• Built full-stack applications end to end: backend in Node.js / Nest.js and PHP / Laravel, frontend in React, Next.js, Vue.js, Angular, and Svelte, with real-time data delivery over WebSockets, and designed parallel background services and task queues to handle real-time data ingestion, idempotent event processing, and high-load traffic across independently scalable workers.
• Developed Solidity smart contracts for EVM networks: ERC-20 token with a 7-level referral system, casino bank contract, and bonus payout contract.
• Built automated trading / market-making software for EVM networks: continuous on-chain data ingestion, order execution, and volume support in real-time.
• Developed an AI sales agent for a travel business that automatically detects customer intent and recommends relevant tours and services.
• Optimized page load speed on legacy systems to a 95+ Google PageSpeed score, plus horizontal scaling and Redis caching to improve throughput. PageSpeed report

Backend Developer (PHP) | Evogence — Kyiv, UkraineJul 2021 — May 2023
• Developed and maintained backend applications and APIs for terminal systems serving US-based clients.
• Worked in a team using a Git pull-request workflow with code review and branching strategy.

Full-Stack Developer | Freelance — RemoteJul 2016 — Jul 2021
• Built backend logic and APIs in PHP and Node.js with MySQL, implemented real-time features via WebSockets.
• Managed diverse client projects independently: from data modeling and API design to frontend integration.

Web Developer | Genius Marketing — Kyiv, UkraineOct 2015 — Jul 2016
• Built landing pages and blogs, integrated WordPress sites.

Web Developer | Bitrix — UkraineSummer 2012
• Developed websites based on the 1C-Bitrix CMS.

Web Developer | R25 Studio — UkraineSummer 2011
• Built website markup/layout and deployed sites on the DLE CMS.

Web Developer | Freelance — Remote2010 — 2015
• Worked continuously on a freelance basis (aside from the full-time roles above), mainly doing website markup/layout and small PHP scripts.
PORTFOLIO
Automated Market-Making Bot for EVM Networks Blockchain / Web3
Built a complete software solution for automated token buying/selling and trading volume support. Implemented wallet creation, fund distribution, and custom trading rules. Compatible with all EVM networks (Ethereum, BNB, Polygon, Arbitrum). The system processes streaming market data in real time.
Referral EVM Smart Contract Blockchain / Solidity
Wrote a fully functional token contract for any EVM network with nickname-based referral registration. Implemented percentage accruals on every buy/sell by referrals across 7 levels with a claim mechanism. Two access tiers: Premium (7 levels) and Standard (3 levels). Fully tested.
Friends of Fashion — Highload Web Application Web Development / Angular + Laravel friendsoffashion.com.ua
Worked on a project built on Angular + Laravel stack. Prepared the system for high load by scaling to 5 replicas for traffic distribution, plus Redis caching. Full cycle: architecture, backend API, frontend integration, and deployment.
LandingCreator.ai SaaS / TypeScript Monorepo / Web3 github.com/mevdad/landing-creator
SaaS platform for publishing token landing pages on custom domains with live on-chain market data (SSE price/candle/trade feeds), in-page swaps (PancakeSwap V2 on EVM, Raydium CPMM on Solana), and cross-chain payments via Heleket with automated treasury distribution. Built as a TypeScript monorepo: Next.js frontend, NestJS/Fastify API, and eight independently scalable background workers sharing a framework-free domain layer, with server-side-only transaction signing and idempotent event handling throughout.
Giveaway Bot — @wizard_giveaway_bot Telegram Bot / Python github.com/mevdad/giveaway_bot
Built a full-featured Telegram giveaway bot in Python (aiogram) with PostgreSQL storage, deployed as a systemd service. Features: configurable giveaway creation, two participation modes (button-click with anti-bot captcha, or keyword in comments), animated live winner draw, end-of-contest notifications, and public result verification.
LANGUAGES
Ukrainian — Native English — Intermediate (strong written)
CONTACTS
Email
[open contact info](look above in the "contact info" section)
Phone
[open contact info](look above in the "contact info" section)
Freelancehunt
freelancehunt.com/freelancer/artemkalinichenko.html