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We are seeking a highly experienced Senior Web Developer with strong expertise in both backend and frontend technologies to diagnose, troubleshoot, and resolve complex bugs across modern web applications. The ideal candidate combines deep technical knowledge with practical debugging skills, ensuring stable, performant, and maintainable software systems. In this role, you will primarily focus on identifying application issues, analyzing root causes, and implementing efficient fixes without disrupting existing workflows. You’ll work across full-stack environments including .NET/C#, Ruby-based systems, and modern JavaScript frameworks such as React and Next.js. Your ability to quickly understand legacy codebases, refactor problematic components, and improve code reliability will be critical. Key Responsibilities • Investigate, diagnose, and resolve bugs across full-stack web applications • Debug backend services built with .NET/C# and Ruby frameworks • Fix frontend UI/UX issues in React and [login to view URL] applications • Optimize performance, reduce technical debt, and improve system stability • Review existing architecture and suggest practical improvements • Maintain clean, maintainable, and well-documented code standards • Collaborate with product teams, designers, and other developers • Ensure responsive, cross-browser compatible interfaces • Implement logging, monitoring, and error tracking enhancements • Support ongoing maintenance, upgrades, and deployment fixes Required Technical Skills • Strong experience with .NET ecosystem, C#, ASP.NET Core • Proficiency in Ruby environments (Rails or similar frameworks) • Advanced React and [login to view URL] frontend development knowledge • Solid understanding of REST APIs, authentication, and data flow • Experience debugging production environments and live systems • Knowledge of SQL/NoSQL databases and performance optimization • Familiarity with Git workflows, CI/CD pipelines, and cloud deployment • Ability to analyze legacy systems and refactor safely Preferred Qualifications • Experience handling large-scale or enterprise web applications • Exposure to DevOps practices, containerization, or cloud platforms • Understanding of scalability, caching strategies, and security best practices • Strong documentation and communication skills What We Value We value developers who approach problems analytically, communicate clearly, and take ownership of delivering reliable solutions. Attention to detail, patience in debugging complex systems, and the ability to balance quick fixes with long-term improvements are essential qualities for this position. This role is ideal for a senior developer who enjoys solving challenging technical issues, stabilizing applications, and improving overall system quality while working with modern full-stack technologies.
Projekt-ID: 40217885
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Hi there, I’m a Senior Web Developer with extensive experience debugging and stabilizing complex full-stack applications across both backend and frontend environments. I’ve worked deeply with .NET/C# (ASP.NET Core), Ruby/Rails, and modern JavaScript frameworks including React and [login to view URL], often stepping into legacy codebases to identify root causes and implement safe, long-term fixes. My core strength is problem diagnosis — tracing issues from UI symptoms through API layers, business logic, and database interactions. I’ve resolved production bugs, performance bottlenecks, and architectural issues without disrupting existing workflows, while also reducing technical debt and improving maintainability. On the frontend, I fix UI/UX issues, optimize rendering performance, and ensure responsive, cross-browser compatibility. On the backend, I debug APIs, authentication flows, background jobs, and database performance issues. I’m comfortable working in live systems, adding logging and monitoring, and collaborating closely with product and design teams. I value clean code, clear communication, and ownership of results. If you’re looking for someone who can quickly understand your system, fix what’s broken, and leave the codebase healthier than before, I’d be happy to discuss how I can help. Best regards, Mikita
$30 USD in 7 Tagen
1,1
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119 Freelancer bieten im Durchschnitt $130 USD für diesen Auftrag

Hello, I came across your project and found it truly interesting. With over eight years of hands-on experience in this field, I have successfully delivered high-quality solutions to clients worldwide. My dedication to excellence is reflected in the 180+ positive reviews from satisfied clients. I’d love to bring this expertise to your project and ensure outstanding results. However, I do have a few important points I’d like to clarify to align perfectly with your vision. Let’s connect via chat, where I can also share relevant examples of my past work. I'm looking forward to hearing back from you! Best Regards, Divu.
$250 USD in 5 Tagen
8,2
8,2

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 .NET, Ruby, React, and Next.js. My focus is on identifying and resolving complex bugs quickly while ensuring system stability and performance. I adhere to clean architecture practices and maintain thorough documentation to enhance maintainability. My approach includes reviewing existing codebases, optimizing performance, and implementing efficient fixes without disrupting workflows. I understand the importance of collaboration and clear communication with product teams and other developers to ensure that all application components function seamlessly. 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. What specific technologies and frameworks are currently in use? What specific technologies and frameworks are currently in use? Let’s discuss over chat! Regards, Arpit Jaiswal
$155 USD in 25 Tagen
7,1
7,1

I'm offering a 25% discount on this project. As a full‑stack developer with extensive debugging experience, I will diagnose and fix bugs across your entire application stack—front‑end, back‑end, database, APIs, and deployment—restoring stability and performance. I'll start by reviewing error logs, user reports, and your codebase to identify the root cause of issues. I will then implement targeted fixes, test across environments, ensure compatibility with existing features, and provide a clear explanation of each resolution. Whether it's a UI glitch, broken API endpoint, data inconsistency, or performance bottleneck, I’ll handle it systematically. You’ll receive a fully debugged, stable application, a summary of the fixes applied, and recommendations to prevent similar issues in the future. Let’s squash those bugs and keep your application running smoothly. Best regards, Sohail
$30 USD in 1 Tag
6,5
6,5

Dear Aletta W., I am a seasoned Full-Stack Developer with expertise in PHP, JavaScript, .NET, Website Design, HTML, Ruby, and Next.js. I understand the importance of resolving complex bugs efficiently and maintaining stable web applications. My approach involves thorough investigation, efficient debugging, and implementing fixes seamlessly across full-stack environments, including .NET/C#, Ruby, and modern JavaScript frameworks like React and Next.js. I prioritize code reliability, performance optimization, and seamless collaboration with teams to deliver high-quality solutions. I am committed to clear communication, reliable delivery, and exceeding expectations. I would love to discuss how I can contribute to resolving bugs and enhancing your web applications further. Looking forward to discussing this opportunity with you. Warm regards,
$30 USD in 7 Tagen
5,9
5,9

Hello Greetings, After reviewing your project description, I am confident and excited to work on this project for you. However, I have some crucial points and questions to clarify. Please leave a message in the chat to discuss this, and I can share my recent work that is similar to your requirements. Thanks for your time! I am excited to hear from you soon. Best regards,
$250 USD in 7 Tagen
6,1
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Good Day Aletta, As a senior Full-Stack Web Developer with expertise in diagnosing and resolving complex bugs, I specialize in efficiently identifying and fixing issues in modern web applications. I will ensure stable, performant, and maintainable software systems for your project. I would like to connect with you in chat to discuss this exciting opportunity further, Aletta W. Why Choose me? - Unlimited Revisions: Ensuring perfection in bug resolution. - Unique Creations: Tailored solutions for your specific needs. - Money-Back Guarantee: Your satisfaction is my priority. - 24/7 Communication: Constant updates and collaboration. - Timely Delivery: Meeting deadlines consistently. Browse my portfolio for quality work samples: https://www.freelancer.com/u/leenadvnani6 Let's discuss your project further in the chat. Best regards, Leena Kumari :)
$60 USD in 2 Tagen
5,5
5,5

Hi I can step in as a senior full stack developer to diagnose and resolve complex bugs across both backend and frontend systems without disrupting your existing workflows. I have extensive experience debugging live production environments, working through legacy codebases, and stabilizing applications built with .NET and C#, Ruby based frameworks, and modern JavaScript stacks including React and Next.js. My approach is analytical and methodical. I focus on identifying root causes rather than surface level fixes, then implementing solutions that improve reliability, performance, and maintainability. On the backend, I am comfortable tracing issues through APIs, authentication flows, and database layers, and on the frontend I address UI and state issues while ensuring cross browser consistency and responsiveness. I also regularly add or improve logging and error tracking so future issues are easier to catch and resolve. Beyond fixing immediate problems, I can review architecture and highlight practical improvements that reduce technical debt and prevent recurring issues. My goal is to leave the system more stable, easier to maintain, and better documented than I found it. Best, Justin
$140 USD in 7 Tagen
5,4
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Hello, I have thoroughly reviewed your project requirement for a Senior Web Developer to resolve complex bugs in full-stack systems involving .NET/C#, Ruby, React, and Next.js. With extensive experience in both backend and frontend development, I specialize in pinpointing application issues swiftly, refactoring legacy codebases, and reinforcing system stability without disrupting workflows. I am proficient in debugging live production environments, enhancing performance, and maintaining clean, documented code standards, ensuring your web applications remain robust and maintainable. My approach involves detailed root cause analysis, effective communication with your product and design teams, and careful implementation of improvements to optimize user experience and backend efficiency. I propose completing an initial diagnosis and bug-fix sprint within 7 days, providing you continuous updates throughout the process Could you specify which current bugs or performance issues are the highest priority for resolution? Best regards,
$155 USD in 28 Tagen
5,4
5,4

I can fix this for you. Your project needs a senior developer skilled in debugging full-stack applications across diverse technologies including .NET, Ruby, and JavaScript frameworks like React and Next.js. I specialize in quickly understanding complex legacy codebases and resolving bugs without disrupting current workflows. I will methodically diagnose backend issues in .NET/C# and Ruby services, then smooth out frontend UI glitches, ensuring a stable, high-performance user experience. My approach emphasizes clean, maintainable code that improves reliability and scalability. Should I prepare a brief plan outlining the debugging steps before we start?
$125 USD in 7 Tagen
5,5
5,5

I hope you're doing well! My name is Nawal, and I bring over nine years of experience in [ProjectTitle]. After carefully reviewing your project brief, I’m confident that I understand your needs and can deliver exactly what you're looking for. Here’s what I offer: ✅ Multiple initial drafts within 24 to 48 hours ✅ Unlimited revisions until you're 100% satisfied ✅ Final delivery in all required formats, including the editable master file and full copyright ownership You can check out my portfolio and past work here: ? Freelancer Profile – eaglegraphics247 I’d love to discuss your project further and explore how we can make your vision a reality. Let me know a convenient time for a quick chat! Looking forward to working together. Best regards, Nawal
$70 USD in 1 Tag
5,0
5,0

Warm greetings! I understand you need a senior full-stack developer to quickly diagnose, debug, and stabilize your complex web applications across .NET, Ruby, and modern JavaScript frameworks. I can approach this by systematically reviewing your codebase, pinpointing root causes, and implementing clean, efficient fixes on both backend and frontend while improving performance and maintainability—the most important tip is ensuring all changes are fully tested in production-like environments to prevent regressions. Best regards, Muamer Kaukovic
$100 USD in 3 Tagen
5,2
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Hi, I am excited about the opportunity to resolve bugs across your full-stack web applications. Your need for a Senior Web Developer with expertise in both backend and frontend technologies aligns perfectly with my skill set. With over 7 years of experience in .NET, C#, React, and Ruby, I can quickly diagnose and fix complex issues to ensure a stable, performant application. My strong background in debugging production environments and ability to refactor legacy codebases will help improve reliability and reduce technical debt. I am committed to maintaining clean code standards and collaborating effectively with your team. Let's work together to enhance your applications while implementing efficient fixes and maintaining existing workflows. Best, Andrii
$200 USD in 1 Tag
4,6
4,6

Are you in need of a seasoned Senior Web Developer to streamline your web applications and enhance their stability and performance? As a seasoned developer with over 5 years of experience, I specialize in diagnosing and resolving complex bugs, ensuring seamless, user-friendly, and efficient systems. I have successfully worked on similar projects offsite and have expertise in backend technologies like .NET/C#, Ruby, and frontend frameworks such as React and Next.js. I’ve built systems that are not only fast and automated but also update-safe and maintainable. Your project goals are my top priority, and I guarantee 100% satisfaction. I’d love to chat about your project! Worst case, you get free advice that can guide your project. Regards, Chirag Pipal
$200 USD in 7 Tagen
4,3
4,3

Hi, I,m saqib javaid , a dedicated and seasoned full-stack developer ready to take up the task of diagnosing, troubleshooting, and resolving intricate bugs on your web applications. My expertise spans backend technologies such as .NET/C# and Ruby, matching two significant skillsets required for this project. Being proficient with C# and ASP.NET Core, I have a strong grasp of REST APIs, authentication, and data flow—skills that are crucial for debugging backend services. regards,saqib javaid
$99 USD in 7 Tagen
4,1
4,1

Hi, I am an experienced senior full-stack developer capable of diagnosing and resolving complex issues across .NET/C#, Ruby-based systems, and modern JavaScript frameworks like React and Next.js. I specialize in debugging production environments, refactoring legacy code safely, and improving system stability and performance without disrupting existing workflows. I can quickly analyze backend and frontend problems, optimize data flow, and implement maintainable fixes while providing clear documentation and recommendations for long-term improvements. My focus is on delivering reliable, performant, and scalable solutions for enterprise-grade web applications. Best regards, Dicong
$200 USD in 5 Tagen
3,8
3,8

Hi there, I’ve read through the scope and I’m confident I can diagnose and stabilize your full-stack apps across .NET/C#, Ruby, and modern frontend stacks like React and Next.js. My approach centers on fast triage, reproducible root-cause analysis, and safe, maintainable fixes that won’t disrupt current workflows. I’ll align with your logging, monitoring, and CI/CD practices to improve visibility and reduce recurrence through targeted tests and documentation. I’ll start with a lightweight live-issue assessment, then implement minimal, robust fixes with a focus on long-term reliability. Where possible I’ll refactor problematic components, optimize data flows, and verify changes across browsers and environments, keeping you informed at every step. Best regards, Jeric Gonzales
$50 USD in 4 Tagen
3,6
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Full-Stack Bug Resolution I'm excited after reviewing your project details! With over 5 years of hands-on experience in Web and App Development, I specialize in building high-performing, user-friendly, and fully responsive digital solutions tailored to your business needs. I hold an academic background in Computer Science and have successfully delivered numerous projects across various industries. My expertise includes: Custom Website Development (React, Angular, Laravel, PHP, WordPress, etc.) Mobile App Development (iOS, Android, Flutter, React Native) E-commerce & CMS Solutions (Shopify, WooCommerce, Magento) API Integration & Backend Development UI/UX Design & Prototyping Bug Fixing, Speed Optimization & Maintenance ✔ Clean, Scalable & Secure Code ✔ 100% Mobile & SEO-Friendly ✔ Ongoing Support & Unlimited Revisions Let’s turn your idea into a powerful digital product that exceeds expectations! Check my profile: https://www.freelancer.com/u/QuickMentor Looking forward to working with you!
$100 USD in 7 Tagen
3,2
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⭐⭐⭐⭐⭐Hello there, I can deliver quick wins without disrupting workflows and provide maintainable solutions. Ready to jump in and start stabilizing your apps immediately. Let’s get your systems running flawlessly—I’m happy to share a quick demo of my past debugging work.
$60 USD in 2 Tagen
3,1
3,1

Greetings I can surely help you for Full-Stack Bug Resolution I am in the IT industry since more than a decade and serve so many clients in building and rebuilding websites, software, and applications I have strong hands-on different cms like webflow, Wordpress, shopify, squarespace, wix and on different programming languages like PHP, Laravel, React, Node.js, HTML, CSS, And I did the migration from HTML to click funnels. I have made so many websites (E-commerce, WordPress, Classified admin, WooCommerce, etc.), bots, softwares, and Mobile applications (Android, IOS, and Huawei Play store) in my entire career. I have strong hands on both the front end and back end. Currently, I am part of the team who are dealing with miscellaneous tasks in dubizzle and Mzad Qatar including design and layouts and they both have more than 1 million users. I believe that you are looking for a web designer and for sure you will get your end desire result with plagiarism-free work and with better quality as I am assuring you this. Package deals can also be done for long-term collaboration as per the client's requirement. Kindly do come on chat so that we can discuss project details further more.
$30 USD in 2 Tagen
5,0
5,0

Hi , I prefer not to use auto bidding because I believe every project deserves a thoughtful and personalized approach. I would really appreciate the opportunity to discuss your project, "Full-Stack Bug Resolution", in more detail. Based on what you have shared, I am confident my background aligns well with what you are looking to achieve. My name is Karim Rattani, a U.S. based technology and creative consultant specializing in web design, web development, mobile app design, and UI UX solutions. I help businesses turn ideas into polished digital products by focusing on clean design, strong usability, and scalable development that delivers real results. When you work with me, you can expect clear communication, custom tailored design and development solutions, and revisions until you are fully satisfied. All final assets are delivered in professional formats, with original work and full ownership rights included. You can view my portfolio here: https://www.freelancer.com/u/karimrattani Thank you for considering my proposal. I would be happy to connect and discuss your project requirements, timeline, and goals in detail. Best regards, Karim Rattani
$30 USD in 3 Tagen
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