You will get Expert Bug Fixing, API Debugging, and MERN Optimization
Project details
A single hidden bug is like a leak in a structural beam—it might seem small, but it can bring down the entire system. Are you tired of 'temporary fixes' that break something else the next day?
I provide professional debugging and optimization services for your MERN stack applications. I don't just patch the holes; I perform a deep structural audit to find the root cause, ensuring your app remains stable, secure, and fast.
What i will solve:
1. Logic Errors: Fixing broken features and unexpected app behavior.
2. API & Integration Issues: Debugging failed requests and 3rd party API connections.
3. Auth & Security: Patching vulnerabilities and fixing login/signup flows.
4. Database Optimization: Resolving slow queries and data sync issues in MongoDB.
5. Deployment Errors: Fixing crashes on Vercel, Heroku, Digital Ocean Droplets or AWS.
I prioritize clean, maintainable code so that once a bug is fixed, it stays fixed.
I provide professional debugging and optimization services for your MERN stack applications. I don't just patch the holes; I perform a deep structural audit to find the root cause, ensuring your app remains stable, secure, and fast.
What i will solve:
1. Logic Errors: Fixing broken features and unexpected app behavior.
2. API & Integration Issues: Debugging failed requests and 3rd party API connections.
3. Auth & Security: Patching vulnerabilities and fixing login/signup flows.
4. Database Optimization: Resolving slow queries and data sync issues in MongoDB.
5. Deployment Errors: Fixing crashes on Vercel, Heroku, Digital Ocean Droplets or AWS.
I prioritize clean, maintainable code so that once a bug is fixed, it stays fixed.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$50
|
Standard
$150
|
Advanced
$200
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 4 days |
Number of Revisions | 2 | 5 | Unlimited |
Bug Investigation | - | - | |
Fix Documentation | - | - | |
Detailed Code Comments | - | - |
1 review
(1)
(0)
(0)
(0)
(0)
This project doesn't have any reviews.
FV
Fannie V.
Jan 31, 2026
MERN Stack (NestJS) Developer Needed – Crypto Swap Bug Fix & Chat Module Implementation
Great experience working with Azhar. He fixed the swap module bug efficiently and implemented the chat module exactly as required. Very professional, good communication, and clean code. Highly recommended and happy to work together again.
About Azhar
MERN Stack Developer | SaaS & Fintech Web Apps | React + Node.js
50%
Job Success
Islamabad, Pakistan - 4:28 am local time
Imagine your platform scaling to 10X users without a single crash.
Here's what I've seen kill promising SaaS products — not bad marketing, not wrong pricing. Bad architecture:
🔴 Spaghetti code that breaks with every update
🔴 Slow database queries — the silent conversion killer
🔴 Ignoring mobile-first responsiveness
🔴 Weak security protocols on sensitive data
Each of these is a leak in your bucket. Every leak is lost revenue.
I'm Azhar — a Full Stack MERN Developer. I don't just write code. I architect systems. That's why I go by one name — The Architect.
Most developers build features. I build foundations. Because a robust codebase is worth more than a thousand features that crash under pressure.
Here's what I did instead:
At Extsy, a Fintech Crypto Exchange, I built a React & Next.js powered trading dashboard and replaced sluggish database calls with optimized MongoDB indexing and Redis caching — reducing average API response time from 1.8s to 340ms, handling thousands of concurrent trading requests without a single crash.
At Finzone (ERP System), I architected a modular Full Stack codebase with NestJS and TypeScript — so clean that the next developer who touched it said "this is the first codebase I've actually enjoyed working in."
A Scalable Architecture is the spine of your business.
It's the structure that holds every single dollar of your revenue together. For 5 years, I've architected React & Next.js frontends and Node.js backends for crypto exchanges, ERP platforms, and SaaS products — always optimizing for the moment traffic spikes and lesser developers' code breaks.
Your app will be fast. Secure. Stable when it matters most.
My Promise:
I won't promise your app becomes a unicorn overnight — that's what marketing gurus sell. What I promise as a Senior Full Stack MERN Developer is a technical foundation so solid, your CTO will sleep at night.
Don't judge me on easy projects. Judge me on the complex, high-traffic challenges in my portfolio — because I thrive where others fail.
If that's what your business needs — MESSAGE ME.
Your Architect,
Azhar Qureshi
FAQ:
Q: Can you handle both Frontend and Backend for my MVP?
A: Yes — I build end-to-end Full Stack applications using React, Next.js, and NestJS, taking your project from a Figma design to a fully deployed product — including REST API development and third-party API integrations.
Q: What's your typical timeline for an MVP?
A: Most MVPs take 4–8 weeks depending on scope. I provide a detailed breakdown before starting so there are zero surprises on either side.
Q: Will the code be easy for another developer to manage later?
A: Definitely. I write clean, modular code with TypeScript and full documentation — so any Full Stack developer can scale or maintain it without a headache.
Q: Do you provide support after the project is completed?
A: I believe in long-term relationships. Every project includes a post-launch support window to fix any issues and ensure everything runs smoothly for your users.
Q: How do you ensure the security of my application and data?
A: I use industry standards — JWT for authentication, Zod for input validation — to keep sensitive data protected, especially on high-stakes Fintech and trading platforms.
Steps for completing your project
After purchasing the project, send requirements so Azhar can start the project.
Delivery time starts when Azhar receives requirements from you.
Azhar works on your project following the steps below.
Revisions may occur after the delivery date.
Bug Diagnosis & Environment Setup
I will analyze the reported issue, reproduce the error in a local environment, and identify the root cause in the code or architecture.
Final Review & Delivery
I will provide a summary of the fix, share the updated code, and guide you on how to prevent similar issues in the future.