Marcos C.
Full Stack Dev | PHP/Classic ASP & Legacy Systems
Full-stack developer specialized in maintaining, improving and modernizing existing PHP and Classic ASP systems — including MySQL and SQL Server backends. I help companies keep legacy platforms stable while adding features, fixing issues, integrating APIs (Stripe, PayPal, REST), improving performance, and modernizing step-by-step without breaking production. Specialties: Long-term maintenance (3–12+ months) PHP 5/7 & Classic ASP MySQL & SQL Server Stripe / PayPal / Webhooks Backend fixes & feature upgrades Cronjobs & automation React/Tailwind dashboards Languages: Spanish (native), English (professional), Portuguese (basic), Italian (basic) If your system is old, undocumented or difficult — I can maintain it and modernize it safely.
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $13k
Billed in all: $29,445$29k
$6.6k in the last 6 months
Across 20 contracts
Earnings, last 30 days
Skill rankings: Top 5% in MySQL
Ranked by MRR among everyone on Upwork with the skill.
- #11Code Refactoring118 freelancers · 🇦🇷 #1Top 9%🇦🇷#1 of 2
- #13ASP174 freelancers · 🇦🇷 #1Top 7%🇦🇷#1 of 2
- #30PayPal394 freelancers · 🇦🇷 #1Top 8%🇦🇷#1 of 2
- #109Troubleshooting1,460 freelancers · 🇦🇷 #4Top 7%🇦🇷#4 of 10
- #129Data Migration1,443 freelancers · 🇦🇷 #3Top 9%🇦🇷#3 of 10
- #249Microsoft SQL Server2,759 freelancers · 🇦🇷 #2Top 9%🇦🇷#2 of 27
- #347Stripe3,151 freelancers · 🇦🇷 #4Top 11%🇦🇷#4 of 20
- #364REST API5,062 freelancers · 🇦🇷 #8Top 7%🇦🇷#8 of 24