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Antonio K.

Antonio K.

Web Development | Node.js, TypeScript, NodeJS Framework, Next.js

I am a Senior Software Engineer with experience in building scalable SaaS applications across various domains including security and marketplace. My expertise lies in frontend technologies, particularly React and TypeScript, complemented by full-stack abilities in backend services and APIs using Node.js and Go. I excel at enhancing system performance, optimizing operational costs, and partnering closely with product and design teams to create reliable, production-ready solutions. As a Frontend Team Lead, I focus on driving innovation and fostering collaboration within my team. If you're seeking a skilled professional who can translate your vision into effective software solutions while ensuring the highest quality standards, let's connect and discuss how I can contribute to your project.

🇭🇷Pula, Croatia$80/hr40% JSSSince Feb 2026

Earnings and projects

MRR
$22k

Last 6 months ÷ 6

World#150 / 412k
🇭🇷Country#2 / 807
Revenue, last 30 days
$22k

Last 6 months: $134k

World#197 / 412k
🇭🇷Country#2 / 807
Total earnings
$157k

Billed in all: $169k

World#22,002 / 412k
🇭🇷Country#58 / 807
Per project
$157k
World#65 / 412k
🇭🇷Country#1 / 807
Projects, last 6 months
0
World#209,850 / 412k
🇭🇷Country#357 / 807
Projects in all
1
0% fixed100% hourly
World#360,671 / 412k
🇭🇷Country#731 / 807

Earnings, last 30 days

$169k+$22.5k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$140k$160k$180kOct 8Oct 23Nov 7

Skill rankings: Top 0.12% in App Development

Top 1% in 2 of 2 skills, ranked by MRR among everyone on Upwork with the skill.

  1. 2Software Architecture964 freelancers · 🇭🇷 #1Top 0.21%
  2. 3App Development2,592 freelancers · 🇭🇷 #1Top 0.12%