You will get bug fixes for your web application
Rising Talent
Project details
Is your web app slow, broken, or not ranking on Google?
I'll diagnose and fix the issues quickly. I maintain many production apps with 90+ Lighthouse scores — I know exactly what to look for.
Common issues I fix:
• Slow page load / poor Core Web Vitals
• Broken responsive design (mobile issues)
• SEO problems (missing meta tags, poor indexing)
• Build errors and deployment failures
• API errors and data fetching issues
• Authentication bugs, TypeScript errors
• Hydration mismatches (Next.js)
• CSS/styling inconsistencies
What you get: root cause analysis (not just a quick patch), clean fix with proper testing, and documentation of what was changed and why.
Tech: Next.js, React, Angular, Vue, TypeScript, Tailwind CSS, Node.js, PostgreSQL, Supabase, Prisma, Vercel, AWS
I'll diagnose and fix the issues quickly. I maintain many production apps with 90+ Lighthouse scores — I know exactly what to look for.
Common issues I fix:
• Slow page load / poor Core Web Vitals
• Broken responsive design (mobile issues)
• SEO problems (missing meta tags, poor indexing)
• Build errors and deployment failures
• API errors and data fetching issues
• Authentication bugs, TypeScript errors
• Hydration mismatches (Next.js)
• CSS/styling inconsistencies
What you get: root cause analysis (not just a quick patch), clean fix with proper testing, and documentation of what was changed and why.
Tech: Next.js, React, Angular, Vue, TypeScript, Tailwind CSS, Node.js, PostgreSQL, Supabase, Prisma, Vercel, AWS
Programming Languages
HTML & CSS, JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$30
|
Standard
$100
|
Advanced
$300
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 1 | 5 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$30
Performance optimization (Lighthouse audit)
(+ 2 Days)
+$60
Additional bug fix (per bug)
(+ 1 Day)
+$20Frequently asked questions
About Duong
Next.js & Shopify Developer | React, TypeScript, Bug Fixes
Hanoi, Vietnam - 2:32 pm local time
I'm new on Upwork, but I've been building production apps and have real
shipped products you can check right now:
SEE MY LIVE WORK:
→ HVACJobsIO — Job board with 330+ listings, Stripe payments (Next.js, TypeScript)
→ PayoutMap — International payment comparison platform (Next.js, PostgreSQL)
→ Nextrient — Nutrition analysis tool with USDA data integration (Next.js)
I also have hands-on Shopify experience — I built and managed my own store
with custom Liquid theme work.
WHAT I OFFER:
- Fast turnaround (most bugs fixed within 24 hours)
- Competitive rates while I build my Upwork reputation
- Milestone payments — you approve before I get paid
- Daily progress updates with screenshots
Stack: Next.js, React, TypeScript, Node.js, Shopify/Liquid, PostgreSQL,
Stripe, Tailwind CSS, Vercel, REST API
I respond within 1 hour. Let's start with a small task so you can
see my work quality firsthand.
Steps for completing your project
After purchasing the project, send requirements so Duong can start the project.
Delivery time starts when Duong receives requirements from you.
Duong works on your project following the steps below.
Revisions may occur after the delivery date.
Diagnosis
Reproduce the bug. Identify root cause through code analysis and debugging.
Fix & test
Implement clean fix. Test across devices and browsers.