You will get Fix bugs and issues in your web app or SaaS quickly
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Project details
I will fix bugs and issues in your web app or SaaS, improving performance and reliability.
𝐒𝐭𝐚𝐫𝐭𝐞𝐫 : 𝐁𝐚𝐬𝐢𝐜 𝐁𝐮𝐠 𝐅𝐢𝐱
• Diagnose simple frontend or backend errors (JavaScript, UI glitches)
• Resolve minor bugs causing broken UI elements, broken links, or slow page loads
• Remove unnecessary code or fix minor syntax issues to ensure smoother functionality
𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝 : 𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 𝐁𝐮𝐠 𝐅𝐢𝐱
• Address both frontend and backend issues (JavaScript, Node.js, API errors)
• Resolve slow loading times, inefficient queries, and server-side issues
• Use tools like Chrome DevTools, log files, and error reporting systems to trace and resolve bugs
𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 : 𝐂𝐨𝐦𝐩𝐥𝐞𝐱 𝐈𝐬𝐬𝐮𝐞 𝐑𝐞𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧
• Troubleshoot and fix high-priority errors affecting core functionality (e.g., payment gateway failures, authentication issues)
• Address security vulnerabilities (XSS, SQL injection, API security)
• Debug and fix issues across multiple interconnected systems and integrations (APIs, databases, third-party services)
𝐒𝐭𝐚𝐫𝐭𝐞𝐫 : 𝐁𝐚𝐬𝐢𝐜 𝐁𝐮𝐠 𝐅𝐢𝐱
• Diagnose simple frontend or backend errors (JavaScript, UI glitches)
• Resolve minor bugs causing broken UI elements, broken links, or slow page loads
• Remove unnecessary code or fix minor syntax issues to ensure smoother functionality
𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝 : 𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 𝐁𝐮𝐠 𝐅𝐢𝐱
• Address both frontend and backend issues (JavaScript, Node.js, API errors)
• Resolve slow loading times, inefficient queries, and server-side issues
• Use tools like Chrome DevTools, log files, and error reporting systems to trace and resolve bugs
𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 : 𝐂𝐨𝐦𝐩𝐥𝐞𝐱 𝐈𝐬𝐬𝐮𝐞 𝐑𝐞𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧
• Troubleshoot and fix high-priority errors affecting core functionality (e.g., payment gateway failures, authentication issues)
• Address security vulnerabilities (XSS, SQL injection, API security)
• Debug and fix issues across multiple interconnected systems and integrations (APIs, databases, third-party services)
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$99
|
Standard
$199
|
Advanced
$299
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 4 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 2 | 0 |
Design Customization | |||
Content Upload | - | ||
Responsive Design | |||
Source Code |
37 reviews
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Rui D.
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I worked with this contractor on a comprehensive review and refactor of our backend project, (Node.js/TypeScript, Docker, Redis, AWS).
They delivered exactly what was needed:
• ✅ A detailed Phase 1 audit of the entire codebase, with a clear, prioritized report on bugs, inefficiencies, and security concerns.
• ✅ Refactoring and improvements that made the backend more reliable, secure, and maintainable.
• ✅ Updated Docker and deployment scripts that simplified our infrastructure setup.
• ✅ Expanded and clarified documentation, including Swagger/OpenAPI for all API endpoints.
• ✅ Strong communication — daily progress updates, proactive feedback, and quick turnaround on blockers.
The work was thorough, technically solid, and clearly documented. I would highly recommend this freelancer for any blockchain or backend infrastructure project.
They delivered exactly what was needed:
• ✅ A detailed Phase 1 audit of the entire codebase, with a clear, prioritized report on bugs, inefficiencies, and security concerns.
• ✅ Refactoring and improvements that made the backend more reliable, secure, and maintainable.
• ✅ Updated Docker and deployment scripts that simplified our infrastructure setup.
• ✅ Expanded and clarified documentation, including Swagger/OpenAPI for all API endpoints.
• ✅ Strong communication — daily progress updates, proactive feedback, and quick turnaround on blockers.
The work was thorough, technically solid, and clearly documented. I would highly recommend this freelancer for any blockchain or backend infrastructure project.
KC
Kris C.
Jun 26, 2025
Refinement of Links Analysis Program
Mandeep is very talented. We have been discussing projects, and I was able to hire him for a project that involved converting Python code to JavaScript and creating a script to run and collect data for display automatically. Every time, it's "yes we can do that," I understand," "we'll get it done." Then the quote shot from 8 hrs to this isn't possible to it's possible for 30+ hours. I wrote the programs I didn't have time to troubleshoot. No way it should take 30 hrs. After I said "no" he was able to complete an initial run for 8 hrs (I checked the timesheet, it was 10 hrs 20 min). While a section of the job was completed, some things were not, and they wanted 10+ hrs to fix. Again, I wrote the original code, no way it's going to take 10 hours for simple fixes, but he was backing into a number and finding every chance to do it. I'm not sure if this is Mandeep or Esferasoft Solutions Pvt Ltd. I won't be hiring either one of them again.
GW
Gina W.
Jun 6, 2025
Mean software Developer
About mandeep
AI MVP WebApp (Claude,Base44)|React|Nextjs|Nodejs|MERN Stack Developer
96%
Job Success
Chandigarh, India - 11:41 am local time
I specialize in modern JavaScript development using Next.js, React, Node.js, and TypeScript, focusing on building full stack applications that are fast, secure, and scalable. My expertise includes MERN stack development, SaaS architecture, REST APIs, and AI-powered web applications.
My goal is to turn ideas into real, working digital products by combining strong system design, clean coding practices, and modern cloud technologies.
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CORE EXPERTISE
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I focus on building systems that are scalable, maintainable, and optimized for real-world business use.
• Full Stack Next.js development (SSR, SSG, SEO optimized apps)
• React.js frontend development with modern architecture
• Node.js and Express.js backend systems
• MERN stack application development
• TypeScript-based scalable applications
• REST API and GraphQL API development
• SaaS application architecture and development
• AI-powered application development using OpenAI
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AI & OPENAI DEVELOPMENT
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I build AI-driven applications using OpenAI and modern LLM technologies. I help businesses integrate AI into real products, not just prototypes.
• ChatGPT integration into web applications
• AI SaaS platforms and automation tools
• AI chatbots and virtual assistants
• Workflow automation using AI models
• AI-powered dashboards and analytics systems
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FULL STACK DEVELOPMENT
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Frontend:
• Next.js
• React.js
• TypeScript
• Tailwind CSS
• Material UI
Backend:
• Node.js
• Express.js
• Authentication (JWT, OAuth)
• WebSockets for real-time apps
• API development and integration
Databases:
• MongoDB
• PostgreSQL
• Firebase
• Redis
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SAAS & PRODUCT DEVELOPMENT
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I build scalable SaaS platforms with multi-user architecture, subscription systems, and API-driven backend systems.
• SaaS application development
• Multi-tenant architecture design
• Subscription and payment integration
• Admin dashboards and analytics systems
• Cloud-based deployment systems
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CLOUD & DEPLOYMENT
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• AWS (EC2, S3, Lambda)
• Vercel deployment for Next.js
• Docker containerization
• CI/CD pipelines
• Linux server management
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PROJECT EXPERIENCE
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I have delivered a wide range of applications including:
• SaaS platforms
• AI-powered applications
• CRM and ERP systems
• E-commerce applications
• Healthcare systems
• Real estate platforms
• GPS tracking systems
• Job portals
• Analytics dashboards
• Custom enterprise systems
Each project is built with scalability, performance, and security as core principles.
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WHY CLIENTS WORK WITH ME
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• 9+ years of professional full stack experience
• Strong expertise in Next.js, React, Node.js, and MERN stack
• Deep understanding of SaaS and AI application architecture
• Clean, scalable, and production-ready code
• Strong communication and problem-solving ability
• Focus on business outcomes and product success
• Experience working with startups and enterprise teams
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WHAT I CAN HELP YOU BUILD
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• Full Stack Next.js applications
• MERN stack web applications
• SaaS platforms with scalable architecture
• AI-powered applications using OpenAI
• Custom dashboards and admin panels
• REST API and backend systems
• Real-time web applications
• Cloud-based scalable platforms
If you are looking for a Full Stack Next.js & AI Developer to build scalable SaaS applications and modern web platforms, feel free to connect.
Thanks
Mandeep
Steps for completing your project
After purchasing the project, send requirements so mandeep can start the project.
Delivery time starts when mandeep receives requirements from you.
mandeep works on your project following the steps below.
Revisions may occur after the delivery date.
Analyse and Gather Information
I'll begin by learning about your requirements, and then I'll develop a document for you that explains the modules that I'll offer.
As per the requirement, design, develop, and add features.
I'll use Invision to create the wireframes, and once you approve them, I'll start working on the module development.