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Mateja I.
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Mateja I.

Full Stack Developer | React/Next.js, Node.js & Supabase Specialist

Need a production-ready SaaS or MVP built fast and without technical debt? With 7+ years of Full Stack experience, I specialize in building scalable SaaS products and MVPs. My expertise is built on a strong Node.js foundation and extensive experience with Headless CMS architectures, allowing me to bridge the gap between complex backend logic and modern frontend performance. What I Can Do For You • Build or improve your web app (React / Next.js) • Create or improve responsive interface • Set up or optimize your backend (Node.js / Supabase / PostgreSQL) • Fix bugs, optimize performance, or refactor code • Develop MVPs and prototypes quickly • Integrate external APIs or third-party services • Deploy apps to Vercel, Netlify, or custom hosting Why Clients Work With Me • Clear, simple communication • Predictable, organized workflow • Fast delivery and frequent updates • Clean, maintainable code that’s easy to continue building on Recent Work • Built and launched a production-ready nutrition tracking app (similar to MyFitnessPal) using React Native, Node.js, Supabase, and PostgreSQL • Developed multiple admin dashboards and internal tools (React, Next.js, Tailwind) • Created custom APIs and backend services (Node.js, REST, GraphQL) If you want a reliable developer who delivers results without drama, let’s talk.

🇷🇸Novi Sad, Serbia$30/hr100% JSS5.00 (6)Since Feb 2025
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Earnings and projects

MRR
$3.2k

Last 6 months ÷ 6

World#11,357 / 412k
🇷🇸Country#116 / 4,015
Revenue, last 30 days
$3.1k

Last 6 months: $19k

World#12,100 / 412k
🇷🇸Country#126 / 4,015
Total earnings
$23k

Billed in all: $25k

World#129,521 / 412k
🇷🇸Country#1,710 / 4,015
Per project
$1.8k

$3.2k in the last 6 months

World#84,070 / 412k
🇷🇸Country#945 / 4,015
Projects, last 6 months
6
33% fixed67% hourly
World#34,405 / 412k
🇷🇸Country#266 / 4,015
Projects in all
13
69% fixed31% hourly
World#175,712 / 412k
🇷🇸Country#2,129 / 4,015

Earnings, last 30 days

$24.7k+$3.1k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$20k$22k$24k$26kOct 8Oct 23Nov 7

Skill rankings: Top 3% in HTML

Ranked by MRR among everyone on Upwork with the skill.

  1. #14Strapi205 freelancers · 🇷🇸 #1Top 7%
  2. #110CMS Development2,787 freelancers · 🇷🇸 #6Top 4%
  3. #125Redux3,245 freelancers · 🇷🇸 #2Top 4%
  4. #231REST API5,062 freelancers · 🇷🇸 #6Top 5%
  5. #248Tailwind CSS6,978 freelancers · 🇷🇸 #7Top 4%
  6. #308Supabase4,116 freelancers · 🇷🇸 #6Top 7%
  7. #586HTML18,716 freelancers · 🇷🇸 #8Top 3%
  8. #636SQL12,903 freelancers · 🇷🇸 #16Top 5%