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Sergio K.
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Sergio K.

UI/UX designer. AI SaaS Web, Mobile App, Figma, Webflow

🥇 Expert-Vetted: top 1% of Upwork talent 🥇 4,700+ hours on Upwork, 100% Job Success 🎯 Worked with: Google, Formula 1, Logitech, Red Bull, Emirates, Tinder, NBA 🎓 Mentor: Stanford, 500 Global, King's College London, and startups from Y Combinator, 🎤 Recent talk (2026): We Make Future conference, alongside speakers from OpenAI & NVIDIA Last update: July 6th, 2026

🇨🇿Prague, Czech Republic$50/hr100% JSS4.90 (29)Since May 2018
GlobeUpwork

Earnings and projects

MRR
$240

Last 6 months ÷ 6

World#106,801 / 412k
🇨🇿Country#149 / 669
Revenue, last 30 days
$0

Last 6 months: $1.4k

Total earnings
$326k

Billed in all: $337k

World#6,607 / 412k
🇨🇿Country#23 / 669
Per project
$6.9k

$480 in the last 6 months

World#24,557 / 412k
🇨🇿Country#51 / 669
Projects, last 6 months
3
33% fixed67% hourly
World#66,479 / 412k
🇨🇿Country#88 / 669
Projects in all
47

Across 61 contracts

34% fixed66% hourly
World#65,007 / 412k
🇨🇿Country#127 / 669

Earnings, last 30 days

$337kNothing 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 22% in User Interface Design

Ranked by MRR among everyone on Upwork with the skill.

  1. #137Rapid Prototyping448 freelancers · 🇨🇿 #2Top 31%
  2. #256FinTech802 freelancers · 🇨🇿 #2Top 32%
  3. #357Mockup1,593 freelancers · 🇨🇿 #1Top 22%
  4. #436Concept Design1,824 freelancers · 🇨🇿 #1Top 24%
  5. #528Usability Testing1,980 freelancers · 🇨🇿 #3Top 27%
  6. #656UX Research2,772 freelancers · 🇨🇿 #5Top 24%
  7. #888Wireframing3,877 freelancers · 🇨🇿 #6Top 23%
  8. #917Mobile App3,535 freelancers · 🇨🇿 #3Top 26%