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Anton O.
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Anton O.

Senior Full Stack Developer | React, Node.js & AI Integrations

I’m a Senior Full-Stack Developer with 10+ years of experience building web and mobile products in the JavaScript and TypeScript ecosystem. My core technologies are React, Next.js, React Native, and Node.js, and I work confidently across both frontend and backend development. I turn product ideas and business requirements into working software end to end. I can take an application from Figma designs to a deployed production system, covering the complete development cycle: UI implementation, frontend logic, backend services, APIs, databases, testing, infrastructure, and CI/CD. Alongside hands-on development, I can take responsibility for architecture, technical decisions, task planning, code reviews, and delivery. I focus on practical solutions, maintainable code, and getting working features into production. I also implement AI-powered features and integrations with modern AI APIs and use AI-assisted development workflows to deliver faster without compromising production quality. 💻 Frontend: JavaScript, TypeScript, React, Next.js, React Native, Redux Toolkit, Zustand, TanStack Query, Tailwind CSS, Material UI, shadcn/ui, Storybook, Cypress, Vitest, Jest ⚙️ Backend: Node.js, Express, Fastify, NestJS, REST APIs, GraphQL, WebSockets, PostgreSQL, MySQL, MongoDB, Redis, Supabase, Prisma, Drizzle ORM, AWS, Azure, Docker, CI/CD, Sentry, Datadog, Grafana 🔌 Integrations: OpenAI API and AI integrations, Twilio, WebRTC, SMS, WhatsApp, Pusher, Ably, Mapbox, Google Maps, third-party APIs

🇧🇬Varna, Bulgaria$50/hr100% JSS5.00 (2)Since Jul 2016

Earnings and projects

MRR
$6k

Last 6 months ÷ 6

World#3,876 / 412k
🇧🇬Country#14 / 1,161
Revenue, last 30 days
$0

Last 6 months: $36k

Total earnings
$319k

Billed in all: $336k

World#6,875 / 412k
🇧🇬Country#32 / 1,161
Per project
$80k

$36k in the last 6 months

World#329 / 412k
🇧🇬Country#1 / 1,161
Projects, last 6 months
1
0% fixed100% hourly
World#128,092 / 412k
🇧🇬Country#308 / 1,161
Projects in all
4

Across 5 contracts

20% fixed80% hourly
World#283,741 / 412k
🇧🇬Country#877 / 1,161

Earnings, last 30 days

$336kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$330k$335k$340k$345kOct 8Oct 23Nov 7

Skill rankings: Top 0.85% in ExpressJS

Ranked by MRR among everyone on Upwork with the skill.

  1. #32Redis1,774 freelancers · 🇧🇬 #1Top 2%
  2. #48ExpressJS5,651 freelancers · 🇧🇬 #1Top 0.85%
  3. #53Redux3,245 freelancers · 🇧🇬 #1Top 2%
  4. #77Tailwind CSS6,978 freelancers · 🇧🇬 #1Top 1%
  5. #114Supabase4,116 freelancers · 🇧🇬 #1Top 3%
  6. #123SaaS6,440 freelancers · 🇧🇬 #1Top 2%
  7. #127Front-End Development8,892 freelancers · 🇧🇬 #2Top 1%
  8. #164MongoDB10,865 freelancers · 🇧🇬 #1Top 2%