Jason G.
Lead Full-Stack Engineer | Startups, SaaS & Finishing AI-Built Apps
Hi, I'm Jason, a senior full-stack engineer who becomes the technical lead for your product. I take over web apps, SaaS platforms and sites that are stuck, half-finished, or built fast with AI tools like Lovable, Bolt, Replit or Cursor, and make them production-ready: secure, fast, maintainable, and shipping. I'm a Top Rated Plus freelancer with $500K+ earned on Upwork and over 15 years of experience. I hold a Ph.D. in Computer Science focused on cybersecurity, have taught software engineering, and have led development teams on large-scale projects for established software companies. I build with AI coding agents every day. That makes me fast, and it means I know exactly where AI-generated code cuts corners: security holes, missing error handling, brittle data models, and code nobody can maintain. How we usually start ✓ A fixed-price code and architecture review: what's broken, what's risky, and what to fix first ✓ Then ongoing ownership: fixes, new features and releases from one senior developer who knows your system end to end What I take on ✓ Taking over and stabilizing existing apps and codebases ✓ Finishing MVPs and AI-built prototypes for launch ✓ Custom web applications, client portals and dashboards ✓ Payments, subscriptions and checkout logic (Stripe, PayPal, custom gateways) ✓ API integrations and automation between business systems ✓ AI features built into real products and workflows ✓ Security hardening, performance and Core Web Vitals ✓ WordPress and WooCommerce, when they're the right tool Technologies ✓ PHP, JavaScript / TypeScript, HTML, CSS ✓ MySQL, PostgreSQL ✓ Stripe, PayPal, REST APIs ✓ WordPress, WooCommerce ✓ Cloudflare, VPS & managed hosting Tell me what you're building and where it's stuck, and I'll tell you where I'd start.
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $164k
$12k in the last 6 months
Across 44 contracts
Earnings, last 30 days
Skill rankings: 🇺🇸#1 in 3 skills of 19 in United States
Rarest: top 0.13% in JavaScript, of 3,807. Ranked by MRR among everyone in United States with the skill.
- Page Speed Optimization210 freelancersTop 0.48%
- Payment Gateway Integration83 freelancersTop 1%
- Bug Fix60 freelancersTop 2%
- Web Application923 freelancersTop 0.22%
- WooCommerce860 freelancersTop 0.23%
- MySQL856 freelancersTop 0.23%
- PostgreSQL807 freelancersTop 0.25%
- WordPress Plugin408 freelancersTop 0.49%