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You will get a full audit and fix of your web app — production-ready, no patches
Rising Talent
Rising Talent
Project details
Most web apps look fine on demo day — and start showing cracks the moment real users hit them. Slow load times, insecure sessions, exposed endpoints, and access rules that were never enforced.
This is a full engineering audit of your web app: I review your codebase for security vulnerabilities, performance bottlenecks, and code quality issues — then deliver a prioritized written report with concrete fixes.
WHAT'S COVERED:
• Auth & session security (cookies, tokens, expiration, refresh)
• Data exposure and access control enforcement
• Frontend performance (load times, render path, bundle weight)
• Backend reliability (error handling, edge cases)
• Code quality and maintainability red flags
WHAT YOU GET:
• Starter: Full written audit report with severity ratings and action plan
• Standard: Audit + fixes for up to 3 critical issues
• Advanced: Audit + fixes for all critical issues + 30-day support
Built across fintech, regulated SaaS, and e-commerce. I fix problems properly — not with patches.
This is a full engineering audit of your web app: I review your codebase for security vulnerabilities, performance bottlenecks, and code quality issues — then deliver a prioritized written report with concrete fixes.
WHAT'S COVERED:
• Auth & session security (cookies, tokens, expiration, refresh)
• Data exposure and access control enforcement
• Frontend performance (load times, render path, bundle weight)
• Backend reliability (error handling, edge cases)
• Code quality and maintainability red flags
WHAT YOU GET:
• Starter: Full written audit report with severity ratings and action plan
• Standard: Audit + fixes for up to 3 critical issues
• Advanced: Audit + fixes for all critical issues + 30-day support
Built across fintech, regulated SaaS, and e-commerce. I fix problems properly — not with patches.
Programming Languages
JavaScript, TypeScript, C#Coding Expertise
PSD to HTML, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$400
|
Advanced
$750
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
About Javier Fernando
Full-Stack Engineer | Nest.js Next.js, TypeScript | SaaS in Production
Merida, Mexico - 11:10 pm local time
Most apps look fine in a demo and start cracking the moment real traffic arrives. Slow pages, shaky security, data that breaks mid migration. That is not a maintenance problem, it is an engineering one, and it is what I solve.
The clearest proof is my own product. Lab2Next is a clinical lab platform I designed, built, and still maintain for real users today: patient registration, quality control workflows, digital results, and role based access. Carrying a product all the way to production and keeping it alive taught me to prevent problems instead of patching them.
How I can help you:
✓ Build a complete product from idea to launch, from the architecture to the interface to getting it live.
✓ Build security into the foundation instead of bolting it on later.
✓ Automate the manual work that slows your team down, so repetitive processes run on their own.
✓ Migrate data and modernize old systems cleanly, with no downtime and nothing broken along the way.
I've worked across fintech, regulated lending, enterprise data, e commerce, and healthcare. Different industries, same instinct: find the weak point first, then build something that holds. I own the work from the first conversation to long after launch, and I keep a high bar the whole way.
Based in Mérida, working remote only.
If you're building something that has to ship and keep working, send me a message and tell me what you're building.
Steps for completing your project
After purchasing the project, send requirements so Javier Fernando can start the project.
Delivery time starts when Javier Fernando receives requirements from you.
Javier Fernando works on your project following the steps below.
Revisions may occur after the delivery date.
Full audit of your codebase
I review your codebase end-to-end: security posture, authentication flows, data exposure, performance bottlenecks, and code quality. I document every finding with severity and recommended fix.
Deliver written report + action plan
You receive a detailed written report: every issue found, severity level, and a clear action plan prioritized by impact. For Standard and Advanced tiers, I then implement the fixes directly.