Oleg B.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Full-stack JavaScript developer with 7+ years of experience. My core is Node.js and custom WordPress development — building things from scratch. I also work with React and have hands-on experience with Next.js (including a production full-stack platform on Next.js 14 + Supabase). Node.js / Backend — Express, Koa, Postgres, JWT auth, Bcrypt, Google Auth, Nodemailer, Socket io — Joi, Swagger, Jest, Supertest — Web scraping with Puppeteer — Telegram bots (node-telegram-bot-api), Telegram Mini Apps — Google APIs (Analytics, Speech, Auth) — File uploads, REST API design WordPress (custom development) — Theme and plugin development from scratch — Custom Post Types, taxonomies, ACF, Gutenberg custom blocks — WP REST API, React components inside WordPress — Performance optimization: caching, image compression, CSS/JS minification — Migrations, WPML / Polylang — Experience with: Contact Form 7, Yoast SEO, WP Rocket, W3 Total Cache, All-in-One WP Migration, Elementor, Gutenberg Frontend / JavaScript — Pure JS (ES6+), React, Next.js, TypeScript, Tailwind CSS — D3.js (data visualization), Chart.js — jQuery, Swiper.js, FullCalendar.js, Lightbox2 — Responsive design, cross-browser compatibility, SCSS/SASS Databases, Infrastructure & Tools — MySQL: tables, relations, queries, triggers — Postgres — Sequelize, Knex — cPanel, DigitalOcean, Git — Postman Other — Shopify (theme customization: CSS, JS, Liquid) — Moodle (frontend) Full portfolio with 50+ contracts available on my Upwork page. English: Intermediate (technical). I read documentation, write clearly. Timezone: UTC+3 (Ukraine). My working language is Russian or Ukrainian. For video calls, I use Google Meet with real-time translation subtitles enabled — you speak English, I speak Russian, and we both see translated subtitles instantly. This works smoothly with no third-party tools required.