
Closed
Posted
The application already runs on a full MERN and next js. A full stack—frontend, backend, and database(Mongo DB) developer is needed to work on an existing project to patch existing features or develop new ones. The candidate must be able dive into this mixed code, understand it, and then push the project forward with fresh features. You will: • Review and refactor the current frontend, backend, and MongoDB layers so everything follows modern best practices. • Build any new React components, Node/Express endpoints, or database schemas we agree on. • Write unit / integration tests and update the README so another developer can spin the app up without guesswork. • Commit through Git with clear messages and create pull requests for each milestone so I can track progress. The candidate will be on boarded only if proves experience and skills.
Project ID: 40369856
217 proposals
Remote project
Active 1 day ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
217 freelancers are bidding on average $10 USD/hour for this job

As an accomplished professional with a rich and diverse skill set I can assert confidently that my experience aligns perfectly with the demands of your project. Having worked on numerous major and minor projects throughout my twelve-year tenure, including several using the MERN stack, I am intimately familiar with the task at hand. Not only will I be able to dive deep into your codebase, but I'll be able to improve and patch the existing features while also developing new ones in line with the modern best practices. I offer more than just proficiency with React, Node.js, and MongoDB—my ability to write clear, maintainable code and thoroughly document my work ensures that others can easily understand and build upon it. My fluency with Git for version control also means you can rely on meticulous change tracking. My client satisfaction record speaks volumes about my passion for delivering above-the-bar results within agreed timelines. I'm not just a coder - I'm committed to collaborating openly and transparently throughout the project lifecycle. Regular updates will keep you informed about every milestone, correspondence through Git would enable better coordination. To cut it short, I not only bring technical prowess but also an attitude of devotion towards your success Let's set sail together toward striking off every item on your project's to-do list!
$8 USD in 40 days
5.3
5.3

⭐ Hello there, My availability is immediate. I read your project post on MERN Full Stack Development. I have extensive knowledge in MERN Stack (MongoDB/MySQL, Express JS, React, and NodeJS), as well as RESTful API integration. I am an experience full-stack developers with skill sets in - React, JavaScript, jQuery, TypeScript, NextJS, React Native - NodeJS, ExpressJS - MongoDB, MySQL, PostgreSQL, SQLServer, SQLite - Redux, Thunk, GIT - JavaScript, HTML, CSS, Tailwind CSS - AWS, Azure, Digital Ocean, GoDaddy, Web Server Hosting Please send a message So we can quickly discuss your project and proceed further. I am looking forward to hearing from you. Thanks
$8 USD in 40 days
5.3
5.3

Hii, ___ The purpose of this project is to improve and expand an existing MERN stack application built with MongoDB, Express, React, Node.js, & Next.js. The developer will analyze the current codebase, refactor the frontend, backend, and database structure, & ensure the application follows modern development best practices for performance, scalability, & maintainability. Additionally, the project aims to introduce new features and improvements by building React components, creating Node/Express APIs, and updating MongoDB schemas as required. The developer will also implement testing, maintain proper Git version control with clear commits and pull requests, and update documentation so future developers can easily understand and run the application. Regards, Ravi s. -- { 12 yrs of Experinec }
$5 USD in 40 days
5.3
5.3

Hello, I hope you are doing well. I understand that you are looking to build a WEB APPLICATION, and I would be happy to help. I have extensive experience in designing and developing applications and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
$8 USD in 40 days
5.4
5.4

As an experienced tech enthusiast who has dedicated 7 years of his career to full-stack development, I am confident in my ability to meet and exceed your expectations for this project. My extensive expertise with languages and frameworks like Node.js and React.js make me uniquely qualified for this MERN full-stack role, allowing me to not only patch existing features but also build new ones from scratch. One particular strength that sets me apart is my adaptability and versatility to navigate and understand complex codes. In fact, I pride myself on being able to quickly dive into mixed code, comprehend it, and then utilize modern best practices to refactor and improve the overall structure of the application. As we progress through your app development, I ensure transparent communication through comprehensible Git commits and well-defined milestones that cater to your needs. Additionally, my broad range of skills encapsulates not just backend services with Node.js but also database management with detailed experience in MongoDB. This proficiency enables me to create efficient yet thorough database schemas that can be seamlessly integrated into the solution we're working on. Trust me to write unit/integration tests diligently and update the README for smooth transition during product deployment or knowledge transfer post development. Let's move forward strategically while creating fresh features! Looking forward to working together to enhance projet completions.
$2 USD in 40 days
5.2
5.2

I am a professional, experienced, and forward-thinking developer. I’ve solved similar challenges in many startups, so I’m confident I can help you too. Let’s connect and discuss the details. I’m sure we’ll find the right solution together.
$5 USD in 40 days
4.2
4.2

Hello. How are you? I have carefully reviewed your requirements I am a senior Mern Stack developer with over 7 years experience. I can perfectly implement your task. I am available to start immediately and can deliver high quality working. Please contact me. Thank you. Joizel Morojo
$6 USD in 40 days
4.7
4.7

✋ Hi There!!! ✋ The Goal of the project:- IMPROVE AND EXTEND EXISTING MERN AND NEXT JS FULL STACK APPLICATION WITH NEW FEATURES, REFACTORING AND PROPER TESTING I have carefully read your complete requirement and understand that you need a developer who can quickly dive into an existing mixed MERN and Next js codebase, improve structure, fix issues, and continue building new features smoothly. I believe I am the best fit for this project because I have strong experience working on complex existing full stack systems and improving them without breaking current functionality. 1. Refactoring frontend React and Next js components for better performance and structure 2. Building Node and Express APIs with proper MongoDB schema management 3. Writing unit and integration tests and improving overall code quality and documentation I provide full UI development, backend API development, database management, testing, and complete source code delivery after completion. I have 9+ years experience as a full stack developer working on MERN and Next js applications and have completed similar projects involving large scale refactoring and feature expansion. Looking forward to chat with you for make a deal Best Regards Elisha Mariam
$6 USD in 40 days
4.1
4.1

With over a half-decade’s experience in full stack development, I’m particularly adept at navigating complex codes and fully understanding them. I know how to work with existing projects, patching up features, and creating new ones. One of my strongest suits is my ability to write comprehensive, well-documented code while adhering to modern best practices. This ensures smooth onboarding for future developers and aids in effective time management. To this end, I'm well-versed with Git, committing with clear messages and leveraging pull requests per milestone for enhanced progress tracking. Moreover, my talents aren't confined to just the MERN stack. I boast an intimate knowledge of many more key technologies that may come in handy during the lifecycle of your project. This includes but isn’t limited to databases like MongoDB and also restful API design. Trust not just my experience alone but the proclivity for successful delivery showcased across multiple industries in previous work—the reasons why you should enthusiastically consider me for your project!
$12 USD in 40 days
2.8
2.8

With your MERN Full Stack Development project and need for a professional to dive into the existing code, refine features, and create new ones—I dare say your search ends here! Having walked clients through similar projects, I've effectively utilized modern best practices while reviewing and refactoring existing codes. This ensures that not only are new features we'll work on fully integrated but also seamlessly aligned with the pre-existing systems. The proof is in the portfolio: gathering user requirements like yours, translating them into clean designs (UI/UX), before deploying seamless web solutions that aren't just appealing but achieve real results for businesses. The cherry on top, deadlines mean everything to me you can trust that your project will be completed efficiently and on time.
$5 USD in 20 days
0.0
0.0

Hello, I understand your goals clearly and know how to turn them into results you’ll be satisfied with. When it comes to matching my skills to your project, nobody does it better—I’m the perfect fit for your needs. I will identify and resolve the bugs in your system efficiently, ensuring smooth functionality and optimal performance. By leveraging modern debugging techniques, I focus on improving security, scalability, and user experience. I’m committed to delivering high-quality, clean code and will maintain clear communication throughout the process, ensuring your issues are resolved in a timely manner.
$7 USD in 40 days
0.0
0.0

When it comes to your project, I bring a unique perspective as a Full Stack Developer with a deep understanding of all the moving pieces, and a talent for navigating complex systems. I will approach your existing MERN stack project with the same focused mindset and meticulous attention to detail that has earned me the reputation of being the 'fixer' in my field. With over 4 years of experience working on diverse projects with international teams, I have honed my ability to understand, refactor and enhance legacy codebases. This includes skills in working with MongoDB, Node.js, Express along with React and Next.js. Moreover, I am proficient in unit testing and I value clear communication which is reflected in my use of Git for tracking progress using PRs. The task ahead excites me - streamlining your application's components, implementing new features - all to create a more efficient user experience. I will bring not just my technical proficiency (with proven skills in CI/CD, Docker), but also my ability to harmonize different parts of a system to ensure it works together seamlessly. Your project deserves an expert who can optimize and push it forward using best practices - this is where my expertise shines. Let's build something exceptional together!
$5 USD in 40 days
0.0
0.0

Hi Tyler, Need a strong review to kickstart my Freelancer profile, happy to work at $30/hour for quality MERN + Next. js maintenance. I've shipped 28 React/Next. js projects in the last 2 years - including full-stack dashboards, APIs, and MongoDB integrations. I work extremely fast, features that take weeks elsewhere often take me hours thanks to advanced tooling and 15 years of full-stack experience. I can dive into your existing codebase immediately, patch features, build new ones, and keep everything clean and maintainable. MongoDB, Node. js, React, Next. js, all core stack for me. Relevant work: https://www.freelancer.com/portfolio-items/11324131 https://www.freelancer.com/portfolio-items/11324094 Ready to start today. Let's build something solid.
$30 USD in 40 days
0.0
0.0

I’m the right fit because I specialize in untangling mixed codebases and turning them into scalable, professional systems. I don't just add features I stabilize the core by refactoring the backend and frontend simultaneously, ensuring the database is optimized and the code follows modern best practices. I’m also big on reliability and transparency. You won’t have to guess where the project stands because I prioritize clean Git workflows, automated testing, and documentation that actually makes sense. My goal is to move the project forward with fresh features while leaving the foundation stronger and more maintainable than I found it.
$2.50 USD in 40 days
0.0
0.0

Dear, Thank you for your job post, I am fullstack developer, I have more than 10 years of experience working with ReactNative, ReactJS, NestJS, NodeJS, NextJS, Ruby on Rails and have strong knowledge of AWS, elasticsearch, postgresql, MySQL, MongoDB, docker, git, redis, sidekiq background job, Tailwind CSS, HTML, JavaScript, TypeScript, Redux, RESTful APIs, CSS, OAuth 2.0, API authentication flows, Heroku, GitHub, GitLab, etc, and have more than 3 years experience working with the Saas project. My experiences are: ReactJS: 5+ years building responsive, high-performance web applications using React, Redux, Hooks, and modern front-end tooling. React Native: 3+ years developing cross-platform mobile apps with native modules, navigation, animations, and RESTful API integration. Ruby on Rails and NodeJS: 10 years of experience developing robust backend services and APIs. Built and maintained scalable monolithic and modular Rails applications using ActiveRecord, Devise, Sidekiq, RSpec, and PostgreSQL. Integrated with front-end clients (React/React Native) via RESTful APIs and GraphQL. I can work more than 40 hours per week and am available to work now I hope can join this job and work for you Thank you
$20 USD in 40 days
0.0
0.0

Hi, I’m a MERN Stack Developer with experience in building scalable web applications using MongoDB, Express, React, and Node.js. I can deliver a responsive frontend, secure APIs, and optimized database structure. I ensure clean code, timely delivery, and clear communication. Let’s discuss your project in detail.
$4 USD in 40 days
0.0
0.0

Hi! I specialize in web and mobile app solutions tailored to client markets, with proven expertise in multilingual setups and seamless integrations. I would be happy to share some of my portfolio over the chat. I'd love to hop on chat here to dive deeper into your project needs, review specifics, and share a quick, tailored proposal to ensure we align perfectly on scope, timeline, and deliverables. Let's discuss! Regards, Zuraiz
$25 USD in 40 days
0.0
0.0

With 6+ years of experience as a full stack developer, I’ve worked extensively with MERN stack and Next js applications, so stepping into an existing codebase, understanding its structure, and improving it efficiently is something I’m very comfortable with. I can review your current frontend, backend and MongoDB layers, refactor them to follow modern best practices, and clean up any inconsistencies so the codebase becomes more stable and maintainable. I regularly build and extend React components, develop Node and Express APIs, and design scalable MongoDB schemas, so adding new features or improving existing ones will be a smooth process. I also place strong emphasis on writing unit and integration tests to ensure reliability, and I will update the README with clear setup instructions so any developer can get the project running without confusion. I follow clean Git workflows with meaningful commits and structured pull requests for each milestone, making it easy for you to track progress and review changes. I’ve handled similar ongoing projects where I had to quickly understand and enhance existing systems, and while I cannot share direct links due to NDA, I can walk you through my past work to demonstrate my experience and approach. Let me know a good time to connect with you ! Here's my Teams id: Lauren Parker
$8 USD in 120 days
0.0
0.0

As an experienced Full Stack Developer with a speciality in JavaScript and Node.js, I believe I have the skillset and expertise you need to successfully complete your MERN project. Over the years, I have dived into various complex codebases and quickly analyzed and understood them. By thoroughly reviewing and refactoring all components - frontend, backend, database - using modern best practices, we can effectively patch existing features or build entirely new ones together. I place great emphasis on clean, scalable solutions and documentation. This makes it easier for fellow developers to work with the codebase, reducing any guesswork and enabling seamless project progress tracking. Your request for clear communication aligns perfectly with my own work ethic, ensuring our collaboration will be transparent and productive. Moreover, integration and optimization are areas in which I excel - by bridging the gap between business needs and technical execution, together we can streamline your operations efficiently.
$6 USD in 40 days
0.0
0.0

Hello, I’m a full stack developer with extensive experience in the MERN stack and Next. I’ve successfully delivered several projects involving complex front-end and back-end integrations, including a recent AI SaaS knowledge base product for an Australian client. For your existing MERN and Next. js application, I will dive into the current codebase, review and refactor the frontend, backend, and MongoDB layers to align with best practices. I’ll build any required new React components, Node/Express endpoints, or database schemas. I’ll also set up or enhance unit/integration testing and update documentation so future developers can easily get started. I communicate clearly, commit code with meaningful messages, and provide pull requests for each milestone. I’m ready to start with a brief code audit or jump straight into refactoring and feature development. I look forward to collaborating and delivering high-quality results for your project. Regards CloudSolutionzhere
$25 USD in 40 days
0.0
0.0

Seoul, Korea, Republic of
Payment method verified
Member since Sep 30, 2025
$2-8 USD / hour
$30-250 USD
$10-30 USD
$30-250 USD
$10-30 USD
₹12500-37500 INR
$5000-10000 AUD
$30-250 AUD
€2-6 EUR / hour
₹1500-12500 INR
$250-750 USD
₹150000-250000 INR
$2-8 USD / hour
$250-750 USD
₹12500-37500 INR
₹1500-12500 INR
₹1500-12500 INR
₹75000-150000 INR
€8-30 EUR
€8-9 EUR
£10-25 GBP
₹75000-150000 INR
$750-1500 USD
$250-750 USD
$15-25 USD / hour