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Jair S.

Jair S.

Angular | React | Senior Frontend Engineer

Senior Systems Engineer with 8+ years of experience in high-performance web application architecture, specializing in component-driven UI systems, declarative view rendering, and modern virtual-DOM patterns. Proven track record leading UI migrations, framework upgrades, and WCAG accessibility optimizations for global platforms while maintaining high code quality. Skilled in translating complex designs into scalable UI components, optimizing unidirectional data management, and leveraging AI-assisted tools like Claude Code to accelerate engineering workflows.

🇨🇴Cartagena, Colombia$20/hr100% JSSSince May 2026
GlobeUpwork

Earnings and projects

MRR
$1.5k

Last 6 months ÷ 2, the fewest it counts (since Oct 2026)

World#30,959 / 412k
🇨🇴Country#418 / 4,578
Revenue, last 30 days
—

Read daily since Oct 27, under 30 days

Total earnings
$3.1k

Billed in all: $3.4k

World#294,603 / 412k
🇨🇴Country#3,434 / 4,578
Per project
$3.1k

$3.1k in the last 6 months

World#53,562 / 412k
🇨🇴Country#624 / 4,578
Projects, last 6 months
1
0% fixed100% hourly
World#128,092 / 412k
🇨🇴Country#1,261 / 4,578
Projects in all
1
0% fixed100% hourly
World#360,671 / 412k
🇨🇴Country#3,327 / 4,578

Earnings, last 30 days

$3.4k+$1.2k earned since Oct 27Billed in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$2k$3k$4kOct 27Nov 2Nov 7

Tracked from Oct 27, 2026.

Skill rankings: Top 6% in SCSS

Ranked by MRR among everyone on Upwork with the skill.

  1. #32RxJS296 freelancers · 🇨🇴 #1Top 11%
  2. #75Ionic Framework1,184 freelancers · 🇨🇴 #1Top 6%
  3. #87SCSS1,459 freelancers · 🇨🇴 #1Top 6%
  4. #353Jira3,199 freelancers · 🇨🇴 #5Top 11%
  5. #463Git5,766 freelancers · 🇨🇴 #5Top 8%
  6. #638Angular6,816 freelancers · 🇨🇴 #5Top 9%
  7. #870Claude5,112 freelancers · 🇨🇴 #5Top 17%
  8. #1,394HTML18,716 freelancers · 🇨🇴 #12Top 7%