MERN App Bug Fixing

@WOFZahid

Hello, I am an experienced and professional MERN full-stack developer. I can stabilise your production MERN application end-to-end — diagnosing and fixing the performance slow-downs, functional flow breaks and security weak points across React frontend and Node/Express + MongoDB backend. I will start by reviewing the codebase in Git, reproducing each issue you outline, and using Chrome DevTools, React Profiler, Postman and MongoDB Compass to identify root causes. I will implement clean, test-covered fixes with passing unit/integration tests, ensuring no critical console or server errors on load and page interactions stay responsive under 200ms. I will close the OWASP-flagged vulnerabilities (e.g. input validation, XSS, NoSQL injection, auth hardening, secret management) and re-test them. I will push patches to a feature branch with clear Git commits so every change is traceable, and deliver an issue report with confirmed root causes plus a hand-off note summarising fixes, config changes and follow-up recommendations. I have stabilised similar MERN production applications in recent projects. Please click on my username to check my profile and past MERN work. Let's discuss in details via chat. Thanks

@santoshkumars17

As your passion-driven web and mobile app developer, I bring over 5 years of real-world experience that includes stabilising and optimizing MERN apps like yours. My full-stack expertise in React, Node, MongoDB along with my grooming with prominent debugging tools such as Chrome DevTools, React Profiler, Postman, and MongoDB Compass makes me the ideal candidate for sorting out every frontend and backend trouble. Something notable about my work is my commitment to clean, optimized, maintainable code - which is increasingly important in ensuring stability long after the fix is done. In addition to resolving the bugs highlighted in your project description, my meticulous approach will also cover verifying and fortifying the security of your MERN application—a crucial aspect that needs attention now more than ever. My solid technical grounding and ability to manage end-to-end development effectively align perfectly with your project requirements. You can rely on me not only to fix every bug but also to keep you updated through clear Git commits that document every change made for easy tracing. Let's have a conversation where we discuss your unique vision for this project and create something amazing together. Do reach out!

@ixorawebmob

Hello, I’ve gone through your project details and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, working with Flutter, Android, iOS, React, Node.js, and APIs. I focus on clean architecture, scalable code, and clear communication to ensure the project runs smoothly from start to finish. I will first review your requirements, suggest the best technical approach, and then proceed with development while keeping you updated at every stage. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify: 1. Do you need this for mobile, web, or both? 2. Do you already have UI/UX designs or should we create them? 3. Will there be any third-party API or payment gateway integration? 4. What is your expected timeline for completion? 5. Are there any reference apps or websites you like? Let’s discuss over chat! Regards, Arpit Jaiswal

@kishanbwts

I can start by running your app and reproducing the performance slowdowns and functional errors you’ve outlined. For the backend, I’ll review your Node/Express and MongoDB queries to identify bottlenecks or inefficient calls causing delays. On the frontend, I’ll use React Profiler and Chrome DevTools to spot rendering issues or unnecessary re-renders slowing key screens. For security, I’ll focus on the flagged OWASP points first, confirming root causes and closing vulnerabilities with best practices like input validation, secure headers, and safe database queries. I’ll write tests to cover all fixes for easier regression checking. To kick off, could you share sample traffic levels or test data so I can simulate typical load? Also, do you already have monitoring/logging tools in place? They can be helpful to watch real-time impact during fixes. Once I have access, my first step will be a clear issue report, then feature branch commits with clean, tested patches, and finally a concise hand-off summary. I’m ready to jump in and stabilize your MERN stack quickly.

@NehalSK

Hi I can help stabilize your MERN application and resolve the performance, functional, and security issues you are experiencing. Having extensive experience with React, Node.js, and MongoDB, I am well-equipped to handle full-stack debugging and optimization for your production app. My action plan involves using React Profiler and Chrome DevTools to isolate frontend slowdowns, auditing the Node/Express backend routes for security vulnerabilities, and optimizing MongoDB queries to ensure responsive page interactions under 200 milliseconds. I will review your codebase via Git, reproduce the bugs, and deliver clean, test-covered fixes on a separate feature branch along with a clear hand-off summary. I am available to start immediately. Please reach out so we can discuss the access details and get this sorted for you. cheers Nehal

@monicasynthesis

Hello, I’m interested in your project and can help diagnose, fix, and optimize your MERN application. I have experience with React, Node.js, Express, MongoDB, performance optimization, bug fixing, and security improvements. I can identify root causes, implement clean fixes, and provide clear documentation for all changes. • Full-stack debugging and optimization • Performance and security fixes • Clean Git workflow and test coverage • Detailed issue report and handoff notes • Clear communication and timely delivery I’d love to discuss the issues and get started right away. Warm Regards, Monica Bhatia

@gauravl3

Having spent several years working as a Full-Stack Developer, my skills and expertise align perfectly with your needs for bug fixing of your MERN app. What sets me apart is my ability to approach your project holistically, leveraging my knowledge in AngularJS, JavaScript, Node.js, NoSQL Couch & Mongo and React.js. With these tools at my disposal, I can effectively trace every issue in the codebase from the frontend to backend, and apply comprehensive fixes that ensure smooth performance across all functionalities. Furthermore, I understand the importance of adopting modern debugging practices to optimize the performance of your app. My command over tools like Chrome DevTools, React Profiler, Postman, MongoDB Compass along with efficient Git commit practices enables me to thoroughly analyze issues, apply tailor-made solutions and deliver clean-patched code promptly. In addition to my Full-stack development skills, I offer a deep understanding of cloud solutions such as AWS, Azure and Google Cloud which can be vital for your app's security and scalability. And talking specifically about security vulnerabilities flagged in your recent audit,I have experience with building secure cloud-native architectures that will align well with the OWASP-listed issues you're facing. In closing, what I bring to the table is not only a strong track record of delivering high-performance software but an unwavering dedication to making technology work for you.

@abhishek060

Hi, What caught my attention is that you're not looking for new features—you need a production MERN application stabilized properly. When performance issues, broken user flows, and security findings exist together, fixing symptoms isn't enough; the root causes need to be identified and addressed systematically. My approach would be to first reproduce each issue, profile both the React frontend and Node/Express backend, review the audit findings, and deliver a clear root-cause report before implementing fixes. I'll use tools such as React Profiler, Chrome DevTools, Postman, and MongoDB Compass to isolate bottlenecks, resolve functional issues, optimize queries/API responses, and close the flagged security vulnerabilities. I'll provide clean Git commits, a dedicated feature branch, test-covered fixes, and a concise handoff document outlining what was changed, why it was changed, and any recommendations for long-term stability. I've worked on React, Node.js, Express, and MongoDB applications where debugging, performance optimization, authentication, API reliability, and security hardening were critical to production readiness. Could you share the audit report and the list of known issues? I can review them and outline a clear remediation plan before we begin. Best regards, Abhishek

@nitinjohnson316

Hi, Full Stack Developer with 14+ years of experience building and maintaining scalable MERN applications. I can help with: • React and Node.js bug fixing • Performance optimization • API and database troubleshooting • MongoDB query optimization • Security issue fixes and validation • UI/UX issue resolution • Unit and integration testing • Clean Git workflow and documentation I have fixed similar issues in production applications and can quickly identify root causes and implement stable solutions.

@iimtpradeepdash

Hi! Your focus on fixing both performance drops and security gaps in a live MERN app is spot on—these usually show up together, and patching just one side never lasts. The need for root cause reports and proper Git hygiene is something I take seriously. I recently stabilized and debugged production MERN deployments for client-facing apps, pushing clean, reviewed code and documenting each step. My workflow always includes real measurement: React Profiler, server logs, and step-by-step breakdowns for audit trails. Any recent changes or traffic spikes right before the slowdowns started? Knowing your peak hours or user counts helps spot triggers faster. I can send a 1-page review plan outlining my diagnosis steps for both UI and backend. For more on my delivery style, you can check past work at work.techindika.com. — Pradeep

@wazeermohamed

As a seasoned full-stack developer with a vast array of experiences, your MERN App Bug Fixing project seems like an exciting challenge that I'm fully equipped to tackle. Having successfully developed and maintained numerous web and mobile solutions, I've honed my skills in React, Node.js, Express, and MongoDB to deliver performant, secure, and scalable applications - the three qualities your project needs most. I understand the intricacies of the Git workflow and the importance of clean code and structured commits when it comes to troubleshooting. My strong grasp on debugging using tools like Chrome DevTools, React Profiler, Postman, and MongoDB Compass will undoubtedly allow me to identify the root causes for each bug you've highlighted as well as address any unforeseen errors on-the-go. Most paramountly, I prioritize long-term maintainability which falls hand-in-hand with your expectation for brief hand-off notes summarizing fixes and any follow-up recommendations. I believe in not just fixing issues but analyzing underlying patterns and contributing towards architectural improvements that prevent future occurrences. With a consistently responsive approach and a strong sense of ownership for project success, I am confident that we can conquer these challenges together.

@anshumanvermaUK

Hi, I have experience debugging and stabilizing MERN applications, including performance optimization, security remediation, and fixing complex frontend/backend issues. I can investigate the reported problems, provide a root-cause analysis, and deliver tested fixes with clear Git commits and documentation. Thanks Anshuman

@murtuza90

Having extensively worked as a full-stack developer, your project aligns perfectly with my expertise. My 13+ years in this field has given me an unmatched understanding of web development trends and best practices. I have extensive experience working with the entire MERN stack that your application needs, from React to Node and MongoDB, and I am well-versed in modern debugging tools such as Chrome DevTools, React Profiler, Postman, and MongoDB Compass which are crucial for effective troubleshooting your app. Additionally, my solid experience of managing dev teams and maintaining a 100% Job Success Rate showcases my technical abilities and organizational skills – both of which will be imperative in thoroughly reviewing your codebase and fixing the issues. My solutions ensure not just immediate problem-solving but also long-term stability by eliminating technical debt. With a stress on clean, test-covered fixes in accordance with proven debugging practices, I will deliver everything you expect from this project—from patched codes pushed to git with clear commits to an issue report confirming root causes for each bug fixed. Let's ensure your MERN application is free of critical console or server errors on load, has consistently responsive page interactions, all while adhering to owasp security standards. Choose me for meticulous MERN app bug fixing that eradicates all pain points from your system.

@codingstriver

With over two decades of experience in full stack development, I have honed my skills in quickly diagnosing and fixing issues across the various layers of application architecture. Your MERN app's bug-fixing challenge falls well within my expertise as I have previously navigated complex debugging procedures on similar technology stacks. My proficiency with modern debugging practices including the use of Chrome DevTools, React Profiler, Postman, MongoDB Compass and my rigorous approach to testing fittingly aligns with your project’s requirements. My robust unit tests ensure not only the identification of root causes for detected issues but also guarantee their eradication. In addition to producing clean, test-covered fixes, I am highly committed to delivering exceptional value to my clients. I will provide you with a thorough issue report elucidating the reasons behind each performance, functional, and security problem. Furthermore, upon completion of the task at hand, rest assured that you will receive an exhaustive hand-off note summarising all the necessary fixes made, configurations changed and any pertinent follow-up suggestions critical to stabilizing your MERN app. There is no doubt in my mind that engaging me on this project is your best bet for achieving your desired acceptance criteria.

@DigitalNightOwl8

Hello there , Good afternoon! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in AngularJS, MERN, MongoDB, React.js, Full Stack Development, NoSQL Couch & Mongo, JavaScript and Node.js. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Feel free to contact us to discuss your project

@mike3608

I understand your MERN application requires expert full-stack handling to address performance, functionality, and security concerns. With extensive experience in React, Node.js, Express, and MongoDB, I am well-equipped to tackle each issue across your stack. I'll begin by thoroughly reviewing the codebase, identifying the problems using tools like Chrome DevTools and React Profiler, and implementing fixes with comprehensive test coverage. My commitment includes detailed issue reports, secure and efficient code updates in a feature branch, and a clear hand-off note. Eager to restore your application’s robustness and ensure it meets your stringent acceptance criteria.

@sameershukla1999

Hi, Your scope aligns well with the kind of full-stack stabilization work I’ve handled for production MERN applications. I can start by auditing the existing Git codebase, reproducing each reported issue, and documenting root causes across performance, functionality, and security. My approach is structured: profile React rendering and API bottlenecks, inspect MongoDB query performance, validate user flows end-to-end, and close security gaps with OWASP-focused remediation. Deliverables will include: • Root-cause issue report with findings and recommendations • Clean fixes committed to a dedicated feature branch with unit/integration test coverage • Handoff notes covering changes, configs, and follow-up actions I work with Git-based workflows and debugging tools including Chrome DevTools, React Profiler, Postman, and MongoDB Compass to keep fixes traceable and measurable. Happy to review access details and jump into the first round of investigation immediately. Thanks

@Anika1802

Hello, I have reviewed your requirements and understand that you need a full-stack MERN developer to debug and stabilize your production application, addressing performance issues, functional errors, and security vulnerabilities across both frontend and backend systems. I can help you systematically review the codebase, reproduce and identify root causes, and implement clean, test-covered fixes to improve performance, reliability, and security while ensuring all changes are properly version-controlled and documented. I would be happy to discuss access to your repository and current issue list so we can start with a structured debugging and optimization process. Looking forward to connecting with you. Thanks

@Saifkhan642

Hi, I can do this work. I've done similar work and can deliver fast. Let’s discuss the details further.