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We’re looking for an experienced full-stack web developer to troubleshoot and fix bugs in an existing web project. Scope of work - Investigate and resolve reported bugs. - Fix layout, responsiveness, and functionality issues. - Test changes across major browsers and screen sizes. - Ensure fixes don’t disrupt existing features. - Provide a brief summary of the changes made. Requirements - Experience debugging and maintaining web applications. - Strong knowledge of HTML, CSS, JavaScript, PHP, Python, C#, Java, and relevant web frameworks. - Ability to work with an existing codebase. - Clear communication and attention to detail. We’ll share the project’s technology stack, bug list, and access details with the selected developer.
Project ID: 40743156
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Hi, your visitors need working pages on desktop and mobile, without bug fixes breaking features they already use. The first step is separating isolated layout problems from failures affecting a whole workflow. I’d reproduce the reported bugs, inspect the relevant HTML, CSS and JavaScript, then trace affected requests through the backend. Shared CSS rules can fix one page while breaking another, so changes would stay scoped, with related screens checked alongside each fix. Testing would cover agreed browsers and screen sizes, including existing workflows around the changed code. Before-and-after screenshots would make visual fixes easier for you to review without reading code. Delivery would include the tested patch and a brief change summary, with any unresolved issues clearly identified. I have two questions: Q1: Which frontend and backend frameworks does the project actually use? Q2: Can fixes be tested on a separate copy, or is the live site the only available environment?
$100 USD in 1 day
3.0
3.0
199 freelancers are bidding on average $134 USD for this job

Hello, With my vast experience in full-stack development, I am fully equipped to tackle the bug-fixing and troubleshooting tasks required for your web project. I’ve been developing a wide range of applications for over 10 years and have worked with numerous languages such as PHP, Python, HTML, CSS, and JavaScript - all of which feature in your project requirements. Having this familiarity will certainly allow me to swiftly dig into your existing codebase, identify potential issues and resolve them effectively. Throughout my journey as a developer, one motto has prevailed: quality matters. I value writing clean and robust code that not only fixes existing issues but also ensures smooth future functionality. Keeping this in mind, I will conduct comprehensive tests to ensure that all changes made address bugs without disrupting the current features. Lastly, communication is key to a successful project. I assure you that I will maintain clear and open communication throughout the course of our collaboration. I am available for any questions or concerns you might have and will keep you updated on all changes made with concise summaries. Let's get started today on fixing your web project and shaping it into something fantastic! Thanks!
$180 USD in 2 days
8.6
8.6

With a proven track record in troubleshooting and maintaining web applications, I am well-equipped to investigate and resolve bugs while ensuring the seamless functionality of your existing web project. My expertise spans HTML, CSS, JavaScript, and PHP, allowing me to navigate through diverse web frameworks effortlessly. How critical is the timeline for addressing the reported bugs in your project? Regards, Yogesh Kumar
$40 USD in 9 days
8.5
8.5

Hello, I’d be glad to troubleshoot and stabilize your existing web project. I can investigate reported bugs systematically, resolve layout, responsiveness, and functionality issues, and verify each fix across major browsers and screen sizes without disturbing existing features. I’m comfortable working within an established codebase and tracing issues across frontend and backend layers, including HTML, CSS, JavaScript, PHP, Python, C#, Java, and relevant frameworks. I will also provide a concise summary of completed changes, testing coverage, and any follow-up recommendations. As a useful improvement, I can help organize the bug list by severity and impact so the most important issues are addressed first. Regards Muhammad
$90 USD in 3 days
8.1
8.1

Hello, I’d be glad to troubleshoot and stabilize your existing web project. I can investigate reported bugs, resolve layout, responsiveness, and functionality issues, then test fixes across major browsers and screen sizes without disrupting current features. I’ll work carefully within the existing codebase and provide a concise summary of every change made. A useful improvement would be adding a focused regression checklist for recurring issues. Check out my portfolio here:- https://www.freelancer.com/u/installerpoint Best Regards, Muhammad Adeel
$80 USD in 2 days
8.1
8.1

The habit that makes bug-fixing on an existing codebase safe is reproducing each reported issue on staging before I change a line — a bug I can't reproduce isn't a bug I can confirm fixed, and guessing at a patch on a live app is how one fix quietly breaks two other things. So I'd work through your bug list one item at a time, reproduce it, find the actual root cause rather than patching the symptom, and fix it in its own commit with a short note on what changed and why — that keeps your summary clear and makes anything easy to roll back. For layout and responsiveness I test at real breakpoints across Chrome, Firefox and Safari rather than just resizing one window, since mobile Safari in particular behaves differently. Before handing back each fix I re-check the surrounding features so nothing regresses. I read an unfamiliar codebase first and match its existing conventions rather than imposing my own style. Send me the stack, bug list and access and I can start reproducing right away.
$30 USD in 1 day
8.2
8.2

Hi, I can build your Wix cleaning website with one clear goal: generating more quote requests and bookings. I have 7+ years of web development experience and can handle the complete Wix build, responsive design, Wix Bookings, lead forms, SEO and launch. I’ll take care of: • Complete Wix website with all requested pages and service subpages • Professional, trustworthy, conversion-focused design • Strong quote and booking CTAs throughout the site • Wix Bookings setup and end-to-end testing • Custom quote form with instant email notifications • Mobile, tablet and desktop optimisation • SEO-focused headings, titles and meta descriptions • Image compression, alt tags and internal linking • Schema where relevant • Basic speed optimisation • Final testing across devices • Simple handover instructions so you can edit content and pricing yourself I’ll make each service page focused on its specific “Cleaning Sydney” search intent while keeping visitors moving toward either a quote request or booking. I’m available to start immediately and can prioritise a fast launch without sacrificing the design, mobile experience or conversion flow. Best regards, Muhammad Rizwan Wix | WordPress | SEO | UI/UX | Lead Generation
$99 USD in 1 day
8.3
8.3

With over 6 years of solid experience in web development, I offer the skill set and expertise necessary to troubleshoot your existing project effectively. I have a deep understanding of HTML, CSS, Java, and PHP that allows me to quickly identify and resolve bugs without disrupting the functionality of your website. My proficiency in relevant web frameworks such as Django brings an added advantage as I approach problem-solving from multiple angles. One of my core strengths lies in my ability to work seamlessly with an existing codebase, ensuring a smooth transition throughout the whole debugging and fixing process. I prioritize clean codes and high coding standards, which means not only will your bugs be fixed but also your project will be optimized for better performance. Furthermore, as a freelancer who's accustomed to managing start-up businesses' websites while maintaining well-established enterprises on different platforms, I can confidently say that I'm capable of investigating diverse bugs effectively and providing transparent summaries of the changes made--a proficiency that aligns perfectly with your requirements! At the end of the day, my primary concern is bringing your vision to life in a functional and visually appealing manner. Let's get started on making your web project flawless today!
$60 USD in 2 days
8.0
8.0

Hi, I checked your "Full-Stack Web Developer Needed for Troubleshooting" project description, it looks like the focus is on delivering a clean, responsive website that works well across all devices. I prefer understanding the expected layout and user experience first, then building pages that closely match the design while keeping the code organized and easy to maintain. Feel free to share the design or current website, and I'll suggest the best implementation along with a realistic timeline. Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.
$150 USD in 6 days
7.7
7.7

Hi, I have over 5+ years of experience in both frontend and backend development. I will do the specified tasks. Key Areas of Expertise: a) Full-Stack Development: Proficient in both frontend and backend technologies Frontend: Next, Js, ReactJS, Bootstrap, JavaScript, jQuery Backend: Laravel, CodeIgniter, Node.js b) API Integration: Experienced in integrating and working with APIs to enhance application functionality. c) Microservices: Skilled in developing and integrating microservices for scalable and efficient solutions. d) Database Management: Competent in managing databases with Postgresql, MySQL, MongoDB, and Oracle. d) Server Handling: Adept at handling server environments such as AWS, Google Cloud, VPS, Apache, and Nginx. Lets connect in chat so that We discuss further. With Regards, Sai
$80 USD in 2 days
7.8
7.8

Hi, I’m interested in troubleshooting and stabilizing your existing web application. I have 11+ years of professional software development experience working with production applications, debugging full-stack issues, fixing APIs and database problems, and resolving frontend/responsiveness issues without disrupting existing functionality. I can help with: * Investigating and resolving reported bugs * Debugging **JavaScript, React, HTML and CSS** issues * Backend/API troubleshooting and error handling * Database/query investigation where required * Responsive layout and cross-browser issues * Identifying root causes rather than applying temporary fixes * Regression testing to ensure existing features continue working * Reviewing logs and production behavior when needed * Clean, minimal changes to the existing codebase * A clear summary of fixes and changes delivered My strongest production stack is Java/Spring Boot, React, JavaScript/TypeScript, REST APIs, SQL databases, Node.js and cloud-based applications**. I also have experience working with Python and PHP-based applications, but I would prefer to review the actual project stack before making any framework-specific claims. I’m comfortable taking over an existing codebase, understanding the current behavior first, and then fixing issues systematically.
$30 USD in 1 day
7.3
7.3

Hello I can quickly isolate and resolve your reported functional, layout, and responsiveness bugs without breaking existing features. Leveraging my strong full-stack background in HTML, CSS, JavaScript, and backend frameworks, I will thoroughly test every patch across modern browsers and screen sizes. Along with clean, reliable code, I will provide a clear summary of all modifications made. Could you share your bug list or staging access so I can diagnose the core issues right away? Best regards, Giáp Văn Hưng
$71 USD in 7 days
7.0
7.0

Hi, I went through your project details and understand what you're looking to achieve. I'd be interested in working with you on this. Based on the requirements you've shared, I can handle the project from start to completion while keeping the work aligned with your expectations, timeline, and desired outcome. My approach is straightforward: first, I'll make sure the requirements and expected deliverables are clear. Then I'll complete the work in structured stages, share progress along the way, incorporate your feedback, and deliver the final work after everything has been reviewed. Before we begin, I have a couple of questions about your requirements that will help me understand the scope more accurately. Feel free to message me so we can discuss the details and determine the best way to move forward. Best regards, Anum
$250 USD in 1 day
6.9
6.9

Hi there, I can efficiently troubleshoot the existing web project by investigating and resolving the reported bugs you've mentioned. My proficiency in HTML, CSS, PHP, and JavaScript will enable me to fix the layout and functionality issues across multiple browsers and screen sizes, ensuring that existing features remain unaffected. My experience includes working with complex codebases and providing detailed documentation of all changes made. I look forward to handling this project and ensuring a seamless user experience. Regards, Ali
$90 USD in 1 day
6.6
6.6

Hey Mate , 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 Java, HTML, CSS, Web Development, Python, PHP, Laravel, React.js, JavaScript and Django. 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.. A fast response is appreciated
$155 USD in 4 days
6.6
6.6

Hi, I'm Denis, a full-stack developer experienced in debugging production systems and working with existing codebases. I understand that fixing someone else's code requires careful investigation to resolve issues without breaking what's already working. From your description, you have a web application with layout, responsiveness, and functionality issues needing systematic resolution. The key is understanding your architecture, identifying root causes, and implementing fixes that don't introduce new problems. I've handled similar maintenance projects, diagnosing issues across browsers and devices, then implementing lasting solutions. I'm comfortable with PHP, JavaScript, React, Django, and other frameworks, and I can quickly navigate codebases to find root causes rather than applying surface-level patches. My approach is straightforward: First, I'll review your bug list and codebase to understand the structure and tech stack. Then I'll reproduce each issue, identify its cause, and implement the fix. I'll test across your target browsers and devices to ensure the fix works without creating new problems. Finally, I'll provide a clear summary of changes and their reasoning. Upfront, I'd like to clarify the bug priority order and which browsers and screen sizes matter most for your users. This helps me focus on what actually impacts your audience first. I'm ready to start immediately. Let's discuss the details. Thanks, Denis.
$30 USD in 3 days
6.7
6.7

I understand, we can troubleshoot your existing web project by tracing the reported issues through the frontend, backend, APIs, and existing codebase, then fix them without disrupting working features. We’ll test the fixes across major browsers and screen sizes, verify related functionality, and provide a clear summary of what was changed. We’re comfortable working with existing projects where the first step is understanding the current architecture rather than rebuilding unnecessarily. 1. Do you already have a list of reported bugs with reproduction steps? 2. What framework or stack is the current project using, and is the code hosted in GitHub or another repository? 3. Are there any bugs currently affecting production users that should be prioritized first? We can review the existing codebase and start with the highest priority issues.
$140 USD in 7 days
6.7
6.7

Hi, I can troubleshoot your existing web project, fix the reported bugs, and clean up layout, responsiveness, and functionality issues without affecting current features. I’m comfortable working in existing codebases and debugging across HTML, CSS, JavaScript, PHP, Python, C#, Java, and common frameworks. I’ll test the fixes across major browsers and screen sizes, then send you a brief summary of what was changed. Clear communication and careful debugging are priorities for me. Regards, Parvesh M.
$75 USD in 3 days
6.4
6.4

Hi there, Debugging an unfamiliar codebase often leads to cascading errors where fixing one UI or backend issue accidentally breaks another critical feature. I provide precise, systematic troubleshooting that isolates root causes in your stack, ensuring clean bug resolution across all browsers and screen sizes without disrupting your live functionality. Here are my questions: 1. What is the primary technology stack of the current web application? 2. Could you share the initial list of reported bugs to review? Drop me a message so we can get started right away.
$250 USD in 10 days
6.4
6.4

I can troubleshoot your existing web project, identify and fix bugs across frontend and backend, resolve responsive and functionality issues, and test everything across major browsers and screen sizes without affecting existing features. I’ll work carefully with the current codebase and provide a clear summary of all fixes completed. Best Regards, Muhammad
$30 USD in 1 day
6.5
6.5

Hi! It sounds like you need a reliable full-stack web developer to tackle some bugs in your existing project. I’ve got over 10 years of experience in both front-end and back-end development, with extensive skills in PHP, JavaScript, and Python. I’m confident I can help identify and resolve the issues efficiently. Let’s get your project back on track!
$200 USD in 2 days
6.6
6.6

Nigeria, Poland
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