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I have an existing scheduling code-base written entirely in JavaScript. At the moment its only fully working feature is the user-notification system, yet the app is already showing performance bottlenecks that slow page loads and make real-time updates feel sluggish. What I need first is a thorough cleanup and refactor that targets performance: untangle duplicated logic, remove dead code, split oversized functions, and trim the bundle so it ships fast. While you work, please leave the code more readable and well-documented so future contributors can follow along without guesswork. Your primary deliverable will be a redeployed build that runs noticeably faster on both desktop and mobile. If you spot bugs on the way, squash them—clean tests must pass before hand-over. After that, we can discuss expanding the feature set to include options such as appointment booking or full calendar integration, but for now the focus is a lean, efficient core built on modern JavaScript best practices (ES6+, modular structure, linting, webpack or Vite, etc.). To accept the job, let me know: • the performance profiling tools you prefer (e.g., Lighthouse, Chrome DevTools, WebPageTest) • how you plan to measure before/after speed gains • an estimated timeline to deliver the refactored code and deployment instructions Once the optimized build is in place, I’ll handle live testing and sign off. I’m ready to start as soon as you are.
Projektin tunnus (ID): 40207951
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Aktiivinen 11 päivää sitten
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193 freelancerit tarjoavat keskimäärin $482 USD tätä projektia

Hi, I’m confident I can speed up your JavaScript scheduling app with a thorough cleanup and modern refactor. I’ll untangle duplicated logic, remove dead code, split oversized functions, and trim the bundle so the app ships fast on desktop and mobile. The code will stay readable and well documented for future contributors, and I’ll preserve the user-notification system while making it easier to extend later. My approach: - Profile with Chrome DevTools, Lighthouse, and WebPageTest to establish baselines and post-improvement metrics. - Incremental refactors in small, testable steps; fix bugs as found; maintain tests and linting. - Optimize bundling, apply code-splitting and lazy-loading where beneficial, and keep ES6+ modular structure (Webpack or Vite). - Deliver a lean, well-documented build and a simple deployment guide so you can push to prod confidently. Timeline: deliver refactored build and deployment notes within 7-10 days, depending on repo readiness. Next steps: I’ll start as soon as you confirm target perf metrics and tooling. What are your top performance targets for desktop and mobile (TTI, FCP, FPS, bundle size)? Do you have constraints on external services or APIs during refactor? Which testing requirements must pass before hand-off (unit tests, integration tests, visual tests)? Do you prefer Webpack or Vite, and what CI/CD setup do you want? Are there any specific coding standards, lint rules, or documentation expectations? What is the minimum browser s
$750 USD 25 päivässä
9,2
9,2

I have carefully reviewed the project requirements for JavaScript Scheduling App Optimization and believe my skills in PHP, JavaScript, HTML5, jQuery/Prototype, and Debugging are a great match. I am confident in my ability to clean up and refactor the codebase to improve performance and deliver a faster app experience. Once we discuss the full scope, I am willing to adjust the budget to ensure we meet your needs. I am eager to begin working on this project and showcase my commitment to your satisfaction. Please go through my profile with 15 years of experience to see the quality of work I have delivered. Looking forward to discussing the job details and getting started.
$525 USD 10 päivässä
8,7
8,7

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.
$750 USD 8 päivässä
8,1
8,1

As a seasoned tech professional, I have hands-on experience in improving the performance of complex applications like yours. My deep understanding of JavaScript - a language we share- combined with a comprehensive knowledge of popular development tools like Lighthouse, Chrome DevTools, and WebPageTest would serve us well here. To measure the efficiency gain post-refactoring, I intend to run performance analyses pre and post-optimization across various metrics such as page load time, response speed, and memory consumption. Through this benchmarking, I will provide you with quantifiable metrics so that you can tangibly see the improvements made. With Regards!
$750 USD 7 päivässä
8,1
8,1

Hello, I reviewed your description and understand you need a performance-driven refactor of your existing JavaScript scheduling app, focusing on cleanup, optimization, and a faster redeployed build. I have 10+ years of experience, I’ll streamline your codebase by removing dead code, refactoring duplicated logic, splitting large functions, and optimizing the bundle using modern ES6+ practices, modular structure, and a build tool like Vite/Webpack. The goal is a LEAN, FAST core with readable documentation for future contributors. What I will deliver Code cleanup & refactor for performance and maintainability Bundle optimization (tree-shaking, code-splitting, lazy loading) Improved real-time updates and reduced page load time Well-documented code + clean tests Redeployed build with deployment instructions Profiling & Measurement Preferred tools: Chrome DevTools, Lighthouse, WebPageTest Measure before/after using TTFB, FCP, LCP, JS execution time, bundle size, and real-time update latency I do have some queries to ask regarding the project to proceed further. Awaiting your positive response. Thanks
$300 USD 7 päivässä
8,1
8,1

Hi, I’ve optimized JavaScript apps for performance and responsiveness, including a multi-user calendar app where I improved page load speed by 30% and reduced server response time by 50%. For your project, I’d start with a performance audit using tools like Chrome DevTools and Lighthouse to identify slow areas. I’d then refactor the code to eliminate dead code, reduce bundle size, and improve overall efficiency. I also prioritize writing clean, maintainable code that’s easy for future developers to work with. Let’s schedule a 10-minute call to discuss your project in more detail and ensure I fully understand your needs. I’m ready to start right away and can dedicate 20 hours per week to this project. Best regards, Adil
$408,57 USD 7 päivässä
7,3
7,3

Hi, I can take your existing JavaScript scheduling codebase and refactor it for performance, clarity, and maintainability, with the goal of delivering a noticeably faster build on both desktop and mobile. My approach starts with profiling first, refactoring second. I typically use Chrome DevTools (Performance & Coverage), Lighthouse, and bundle analyzers (Webpack/Vite) to identify render bottlenecks, oversized bundles, duplicated logic, and unused code. From there, I’ll split large functions, remove dead paths, modularize the codebase, and apply modern ES6+ patterns so the app ships lean and predictable. To measure gains, I’ll capture before/after metrics (load time, JS execution time, bundle size, interaction latency) and validate improvements with repeatable tests. Any bugs uncovered during cleanup will be fixed, and all tests will pass before handover. Estimated timeline: 1 week, depending on codebase size and current tooling. Deliverables include the optimized build, deployment instructions, and cleaner, well-documented code ready for future feature expansion. I’m ready to start immediately. Thanks
$500 USD 7 päivässä
7,0
7,0

Hello, I've reviewed your requirements and have worked on similar projects before. With my experience and skills, I can complete your project to your satisfaction. Please contact me via chat to discuss the details. Thank you.
$500 USD 15 päivässä
7,3
7,3

Yo there, Actually I just read the project details and Willing to start work once I receive codes as I am JS HUB so I would like to you please come to the chat box so we can easily discuss in details , If the code receive will give you willing to finish all things with documentation and support you until you satisfy, Happy,
$350 USD 1 päivässä
6,8
6,8

Hello, I’m reaching out on behalf of Smart Sols, a seasoned software development company with over 9 years of experience in full-stack development, including proficient JavaScript coding and optimization. We fully understand that you have an existing scheduling app written entirely in JavaScript and are looking to optimize its current code-base. Our team’s expertise in modern frontend technologies and performance tuning positions us well to analyze your existing code, identify bottlenecks, and implement efficient solutions that enhance both functionality and performance. We are confident in delivering optimized, maintainable code that meets your scheduling app’s requirements with high reliability. We’d be glad to discuss the specifics further to ensure we align perfectly with your needs and expectations. Looking forward to collaborating with you and making your scheduling app faster and more robust.
$750 USD 7 päivässä
6,9
6,9

Hi I can refactor your JavaScript scheduling codebase by profiling performance bottlenecks, removing duplicated logic, modularizing large functions, and optimizing the bundle for significantly faster load times. The core challenge is balancing cleanup with stability, so I’ll introduce ES6+ structure, linting, and build-tool improvements while ensuring your notification system and existing logic remain intact. I’ll document every critical module, add clearer naming and comments, and streamline state flow to make future development far easier. Performance will be measured through Lighthouse, Chrome DevTools, and WebPageTest so we can compare before/after metrics with objective benchmarks. Any bugs discovered during refactoring will be fixed, and all tests will pass in the final optimized build. Your redeployed version will load faster on desktop and mobile and feel more responsive in real time. I’m ready to begin immediately and provide deployment instructions along with the improved build. Thanks, Hercules
$500 USD 7 päivässä
6,7
6,7

I HAVE WORKED ON SIMILAR HIGH-PERFORMANCE APPLICATIONS WHERE SPEED, CLEAN CODE, AND SCALABILITY WERE THE CORE SUCCESS FACTORS — LET’S TURN YOUR CODEBASE INTO A FAST, FUTURE-READY PRODUCT. I propose a focused refactor and optimization of your existing JavaScript scheduling application with a performance-first mindset. The objective is to significantly improve load times, real-time responsiveness, and long-term maintainability while preserving existing functionality. Core Scope & Features • Full performance audit and profiling (before/after benchmarks) • Removal of dead code, duplicated logic, and unused dependencies • Modular ES6+ refactor with clean, readable structure • Bundle size reduction and build optimization (Webpack/Vite) • Bug fixes identified during refactor • Code documentation and linting for future contributors • Optimized redeployed build for desktop and mobile User Roles Supported • End Users – faster notifications and smoother real-time updates • Developers – clean, documented, maintainable codebase • Admin/Owner – stable, scalable foundation ready for new features Deliverables • Fully optimized and redeployed application • Complete, well-documented source code • Performance comparison report (before vs after) • Deployment and handover instructions I will provide 2 YEARS OF FREE ONGOING SUPPORT POST-LAUNCH, covering bug fixes, minor optimizations, and guidance. You will receive 100% complete source code ownership with no lock-in.
$350 USD 7 päivässä
7,2
7,2

Hi there, I appreciate the opportunity to work on optimizing your JavaScript scheduling app. I understand the importance of enhancing performance and ensuring a seamless user experience. As a top California freelancer with a strong track record of delivering high-quality software solutions, I have completed numerous optimization projects, receiving 5-star reviews for my attention to detail and commitment to best practices. I will start by conducting a thorough code cleanup to eliminate duplicated logic and dead code, while breaking down oversized functions for better readability and maintainability. By utilizing tools like Lighthouse and Chrome DevTools, I will effectively profile the app’s performance and provide measurable results post-refactoring. My goal is to deliver a deployable build that significantly improves speed on both desktop and mobile environments. Once the refactored code is in place, I will provide detailed deployment instructions. I'm ready to get started as soon as you are! What specific performance profiling tools do you have in mind for this optimization?
$610 USD 8 päivässä
6,5
6,5

Hello, I’ve reviewed your JavaScript scheduling app and I’m confident I can deliver a lean, high-performance refactor that runs noticeably faster on both desktop and mobile. I’ll start with a thorough profiling pass using Lighthouse, Chrome DevTools performance, and WebPageTest to establish a clear before/after baseline. Then I’ll: untangle duplicated logic, remove dead code, split oversized functions, and trim the bundle with modular ES6+ structure; set up linting; migrate to a modern build system (Webpack or Vite) for optimal tree-shaking and caching; and document the codebase for future contributors. The deliverable will be a redeployed, well-tested build that’s faster, readable, and maintainable, with clean tests passing before hand-off. After this, we can discuss expanding features like appointment booking or calendar integration. My approach includes: measurable performance gains verified by baseline and post-change metrics, a clear, documented refactor plan, and a deployment guide for your live environment. I’m ready to start immediately and can target a first stable baseline within a week, followed by refinements in days 8-9.
$250 USD 9 päivässä
6,6
6,6

Hi, I’ll refactor and optimize your JS app for speed—cleaning dead code, reducing bundle size, improving structure, fixing bugs, and delivering a faster redeployed build with clear docs and tests passing.
$250 USD 7 päivässä
6,3
6,3

My name is Kanza and as a trusted Full-Stack Web and App Developer, I have an enduring passion for creating high-performing and scalable solutions that are tailored to address specific business needs. My extensive experience in Frontend Development and JavaScript makes me the perfect candidate to tackle your scheduling app optimization project. Utilizing my skills in languages such as HTML, CSS, PHP, React alongside my knowledge of modern JavaScript best practices (ES6+, modular structure, linting, webpack or Vite), we can transform your app into one that is leaner, more efficient, and blazing fast. In terms of performance analysis & optimization, I propose utilizing a mix of performance profiling tools like Lighthouse, Chrome DevTools, and WebPageTest. This combination enables us to have a comprehensive understanding of potential bottlenecks while also providing effective means for measuring the speed gains throughout the entire process. As for your estimated timeline question, I believe in setting achievable yet ambitious deadlines to keep project momentum high without comprising quality. In this case, given the thoroughness of the task at hand to deliver clean code with significant speed improvements alongside clear deployment instructions -- a two to three-week timeframe should be sufficient. Finally, rest assured that I will be easily reachable and ready to provide full assistance post-deployment if required. Let's launch your app into warp speed starting today!
$250 USD 2 päivässä
6,2
6,2

Hi! I can help you refactor and speed up your JS scheduling app without breaking the current notification feature. Tools I use: Chrome DevTools (Performance + Coverage), Lighthouse, and sometimes WebPageTest. How I measure gains: I’ll record a “before” baseline (load time, JS bundle size, main-thread time, TTI, FPS for real-time updates), then compare the same numbers after refactor. I’ll also track bundle size + unused code removed. Plan: remove dead code, merge duplicated logic, split big functions/modules, optimize re-renders/updates, trim bundle (tree-shaking, code-splitting), add linting + clearer comments, and make sure tests pass clean. Timeline: usually 3–7 days depending on project size and current build setup. I’ll also include simple deployment steps (Vite/webpack build + env notes). If you share the repo + how you deploy now, I can start with profiling first and send you the baseline results.
$500 USD 3 päivässä
6,2
6,2

As someone highly experienced in JavaScript and Web Development, I'm confident in my ability to optimize your scheduling app in line with modern best practices. I will start by conducting a detailed profiling of the app's performance using a combination of Lighthouse, Chrome DevTools, and WebPageTest. This will enable me to identify and untangle any duplicated logic, remove dead code, split oversized functions, and streamline the bundle to ship faster. Given my expertise in Full-Stack and Web3 development over the past 13+ years, I understand the immense importance of delivering high-impact, result-driven solutions. Your project aligns perfectly with my skill set where proven knowledge of modern JS practices (ES6+, modular structure, linting), bundling tools like Webpack/Vite alongside Performance tweaks is paramount. Let's aim for a leaner and more efficient core together – after all, future-proofing with well-documented and readable code is the key to lasting success with any project! I estimate a 3-week timeline for delivering the refactored code and deployment instructions - ready when you are!
$250 USD 1 päivässä
6,1
6,1

Hi there, I’m offering a 25% discount for this project. With expertise in JavaScript application optimization, I will improve the performance, reliability, and usability of your scheduling app. I specialize in optimizing logic, fixing bottlenecks, refining UI interactions, and ensuring smooth, responsive scheduling workflows. You’ll receive a faster, more stable scheduling app with optimized code and improved user experience, without any technical hassle. Best regards, Sohail
$250 USD 1 päivässä
6,4
6,4

Hello There!!! ⚜⭐⭐⭐⭐⚜(( OPTIMIZE AND REFACTOR JAVASCRIPT SCHEDULING APP FOR SPEED ))⚜⭐⭐⭐⭐⚜ Project GOAL: Deliver a clean, modular, and high-performance build of the existing scheduling application. Your current codebase already handles notifications, yet performance issues and tangled logic are holding the app back from feeling responsive. You need a focused refactor that removes dead code, reduces bundle size, and improves real-time behaviour without breaking the working parts. I have extensive experience optimizing JavaScript applications using ES6 modular patterns, webpack and Vite builds, and structured debugging through Chrome DevTools and Lighthouse. My plan is to profile the slow paths, separate oversized functions, introduce caching where needed, and add clear documentation so the project becomes easy to maintain. The most important features are faster page loads on mobile and desktop, a fully cleaned and readable code structure, and all existing tests passing before deployment. I would be happy to share a quick audit approach and timeline so we can start improving performance right away. Warm Regards, Farhin B.
$256 USD 10 päivässä
6,4
6,4

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