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I have a production-ready React web application that needs a fresh pair of experienced eyes. The codebase is stable and already deployed, but I want someone who can first get fully acquainted with the current architecture and then keep the project healthy over time. Your focus will be twofold: • Performance optimisation – profile the app, pinpoint slow renders or network bottlenecks, and deliver measurable speed gains without altering existing user flows. • Feature enhancement – take new UI/UX ideas from brief to production, following the project’s current component patterns and styling conventions. You’ll work directly in the existing Git repository, create concise pull requests, and document any refactors so future onboarding is painless. Solid knowledge of React hooks, context, and modern tooling (Webpack/Vite, ESLint, Jest or similar) will make the ramp-up smoother. Acceptance criteria for each task will be agreed upfront (e.g., target Lighthouse score, specific feature story completion). If this sounds like a comfortable long-term fit, let’s talk specifics and get you into the repo.
Proje No: 40093643
141 teklifler
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141 freelancer bu proje için ortalama $20 USD/ saat teklif veriyor

Hello, I will begin by fully onboarding with your production React app to understand the current architecture, baseline performance, and how features map to your component patterns. Then I will profile and optimize hot renders and network bottlenecks, delivering measurable speed gains without altering existing user flows, while enabling smooth feature enhancements aligned with your UI/UX brief. I’ll push small, well-documented PRs and document refactors to keep onboarding painless for future contributors. I’ll work within your tooling (Webpack/Vite, ESLint, Jest or similar) and ensure changes meet upfront acceptance criteria with clear milestones and measurable targets (e.g., Lighthouse improvements, faster load times). The approach emphasizes long-term code health, maintainability, and predictable delivery. What are the target Lighthouse scores for performance, accessibility, and best practices? Which production pain points should we prioritize first (e.g., FCP, TTI, bundle size) and how will we measure success? Are there preferred metrics or dashboards for monitoring after changes? Should we strictly preserve existing UI patterns, or is there room to adjust styling to improve usability? What is your CI/CD and PR process, including required checks and documentation? What is the single most important metric to improve first and what is the target timeline for achieving it? Best regards,
$25 USD 37 gün içinde
9,0
9,0

Dear , We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time. We are 25 years in this business and our technical specialists have strong experience in JavaScript, Agile Development, Software Development, Git, Web Development, Frontend Development, Documentation, Webpack and other technologies relevant to your project. Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews. Please contact us via Freelancer Chat to discuss your project in details. Best regards, Sales department Tangram Canada Inc.
$25 USD 5 gün içinde
7,9
7,9

Optimize and Enhance React Web App: Your project aligns perfectly with my skill set in JavaScript, Agile Development, Software Development, Git, and Web Development. I am confident in my ability to profile the app for performance optimization and enhance features while adhering to current architecture. Budget flexibility is a possibility once we discuss the full scope. Let's dive in and discuss the specifics. Please review my 15-year-old profile to see my extensive experience. Your satisfaction is my priority. I am eager to begin and showcase my commitment to the project. Excited to hear from you.
$18 USD 3 gün içinde
7,5
7,5

Hello, As a seasoned engineer and developer, I am confident in my ability to meet and exceed your project's expectations. I have extensive experience with JavaScript, robust knowledge of modern tooling such as Webpack, ESLint and Jest, and a strong grasp on React hooks, context and component patterns - all skills vital for enhancing and optimizing your React web app to peak performance. Crucially, I have an efficient working style that aligns perfectly with the existing Git repository approach set forth in your project description. You can expect my pull requests to be clear, concise, and consistently backed by thorough documentation to make future onboarding smooth. One of Live Experts' core values is delivering not just quality but satisfaction. I fully understand the importance of staying committed to agreed-upon acceptance criteria and ensuring a target Lighthouse score or specific feature story completion is met every step of the way. Should you entrust me with your project, you can rest assured you've handed it to capable hands that will ensure optimal performance and consistent feature enhancements for the long term. Let's have a conversation on how we can take your project to new heights! Thanks!
$50 USD 552 gün içinde
7,0
7,0

Hi Stan . I’m your web developer, ready to turn your project Optimize and Enhance React Web App into reality! I’d love to discuss the details and create something amazing together. Feel free to message me anytime, and we can also hop on a quick video or audio call whenever it's convenient for you. I’ve developed many projects exactly like what you’re looking for. If you want to see more relevant samples, just contact me through the chatbox, and I’ll share them instantly. ★ Why Clients Trust Me 500+ successful web projects delivered 430+ positive client reviews Expert in JavaScript, Agile Development, Software Development, Git, Web Development, Frontend Development, Documentation, Webpack WordPress, Shopify, PHP, JavaScript, HTML, CSS, Plugin/Theme Development, Laravel, WebApp Clean, modern, responsive and SEO-optimized designs Fast delivery, great communication, and long-term support Available during EST hours for smooth collaboration If you want a professional developer who delivers quality work on time and stress-free, let’s connect. I’m excited to help build something amazing for you. Best regards, Kausar Parveen
$25 USD 40 gün içinde
7,1
7,1

Hi, I understand you're seeking a seasoned React developer to audit and enhance your stable production app without disrupting user flows. Your focus on performance profiling, bottleneck elimination, and seamless feature rollout aligns perfectly with my expertise. I have hands-on experience optimizing React hooks, context usage, and modern tooling including Webpack, ESLint, and Jest, ensuring clean, documented code and smooth onboarding for future devs. My approach is to first deeply understand your architecture, then implement measurable improvements with clear acceptance criteria. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. Are there any current user experience pain points or performance metrics that you want me to prioritize during the initial audit? Thanks, Asad
$25 USD 25 gün içinde
7,1
7,1

As a seasoned developer with over 12 years of experience and a top-level ranking in Freelancer.com, I have the expertise to provide the level of service your project requires. My skills in JavaScript and web development in particular are closely aligned with what you need to optimize and enhance your React web app. My long history in the field of full stack development means that I'm adaptable and fluent across a wide range of modern technologies including Reacts's hooks, context, and similar tools like Webpack/Vite, ESLint, Jest. By leveraging these skills, I can effectively profile and pinpoint any performance bottlenecks, offering measurable speed gains without disrupting your existing user flows. Thanks....
$15 USD 40 gün içinde
7,1
7,1

Hi, there. I have strong hands-on experience in building frontends using React.js, so I would be happy to work on your project. Please contact me so that we can discuss the details further. Thanks, Jijo
$20 USD 40 gün içinde
6,6
6,6

Hello, ◆◆◆◆◆ Portfolio & Past Work: ◆◆◆◆◆ https://www.freelancer.com/u/neerajdhameliya With strong experience in React and full-stack development, I have worked on production-ready web applications focused on long-term stability, performance optimization, and scalable feature growth. Core expertise includes understanding existing architectures, optimizing render performance, improving Lighthouse and Web Vitals scores, and building new features that follow established component patterns and styling conventions. Also, I can profile applications using React DevTools, identify re-render and network bottlenecks, implement clean refactors with proper documentation, and deliver concise pull requests for easy review. Familiarity with modern tooling such as Vite/Webpack, ESLint, Jest, and Git-based workflows ensures smooth collaboration and painless future onboarding. So, I look forward to collaborating with you on this project. Best regards, Niral D
$15 USD 40 gün içinde
6,5
6,5

Dear Hiring Manager, I can help optimise and enhance your React web application while maintaining the current architecture and design patterns. Implementation Approach: • Audit current React codebase to identify performance bottlenecks, slow renders, and network inefficiencies • Implement optimizations: memoization, lazy loading, code-splitting, and efficient state management to improve Lighthouse and real-world performance metrics • Develop new UI/UX features aligned with existing component structures, styling, and hooks conventions • Ensure all changes are tested (Jest/React Testing Library) and documented; create clean pull requests for review • Set up ongoing monitoring and best practices for maintainable, scalable code Queries: • Are there any critical performance targets (e.g., Lighthouse score or TTI thresholds) you’d like to achieve? • Will new features follow a strict design spec or allow creative input? • Which build tooling is currently used: Webpack or Vite? I will be waiting for your response. Kindest Regards,
$15 USD 40 gün içinde
6,5
6,5

Hi Client, We’ve optimized and enhanced several React web apps, including a large-scale product with 1 million users. We focused on performance, reducing load times by 30% and improving Lighthouse scores from 50 to 90. We also revamped the UI based on user feedback, ensuring a seamless experience. As a full-stack developer with 15 years of experience, I’ve worked extensively with modern JavaScript frameworks like React, Vue, and Next.js. I’m well-versed in both front-end and back-end technologies, so I can handle any task that comes up. Let’s schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best, Adil
$22,73 USD 40 gün içinde
6,0
6,0

As a seasoned Full-Stack Developer with extensive experience in frontend development, JavaScript, and overall web development, I am confident that I can deftly handle all aspects of your React web application. I understand the importance of stability and optimization in production-ready codebases, which is why I will bring my skills to bear on scrutinizing your architecture, ironing out any bottlenecks that compromise performance, and delivering measurable speed improvements through tried and tested techniques. Moreover, my knowledge of React hooks, context, and modern tooling including Webpack/Vite for bundling assets, ESLint for linting, Jest for testing , or similar will ensure a seamless transition into the existing Git repository. Efficiency is vital in any development process and I pledge to provide concise pull requests and refactor documentation to enhance future onboarding. Not only do I offer expertise but also a long-term commitment to your project. With me onboard, you can rest assured that UI/UX ideas will not only be efficiently translated from brief to production but also aligned with your project's current component patterns and styling conventions. Let us improve your app's performance and introduce new features that align with specific acceptance criteria!
$25 USD 40 gün içinde
5,3
5,3

Hello. Make it work, make it right, make it fast. You need a steady React maintainer who can improve performance without disrupting user flows. Your success depends on disciplined profiling, not guesswork, and small reviewable PRs. I will baseline Lighthouse and runtime metrics, then target slow renders, bundle weight, and network bottlenecks. New features follow your existing component patterns, styling rules, and testing conventions. I’ve maintained production React apps where measurable speed gains came from careful refactors. I start with an architecture walkthrough and performance baseline, then deliver improvements iteratively. Which KPI matters most first, Lighthouse, TTI, or key user journey latency?
$30 USD 40 gün içinde
5,2
5,2

Nice to talk you , After reading in detail the requirements of your project and concluding that they match my areas of knowledge and skills, I would like to introduce myself. My name is Anthony Muñoz and I am the lead engineer for DS Pro IT agency. I have worked for over 10 years in Backend and software development and have successfully done multiple jobs. It will be a pleasure to work together to make your project a reality. Please feel free to contact me. I´m looking forward to working with you. I really appreciate your time and remain attentive to any request or question. Greetings
$42 USD 40 gün içinde
5,7
5,7

Hello Stan, I am Maryam Abbas, a JavaScript and Frontend Development expert with 4 years of experience. I have carefully reviewed your project requirements and am confident in my ability to optimize and enhance your React web application. I will start by thoroughly profiling the app to identify and address any performance bottlenecks, ensuring measurable speed improvements without disrupting user experience. Additionally, I will implement new UI/UX features while adhering to the project's existing architecture and styling guidelines. With a proven track record of successful projects and positive client feedback, I am eager to discuss how I can add value to your project. Please review my portfolio at https://www.freelancer.pk/u/maryam951 and start a chat to further discuss the details. Best regards, Maryam Abbas
$20 USD 40 gün içinde
4,7
4,7

Hello, I am a Web Developer with 15+ years of experience in designing and developing simple to complex websites, e-commerce platforms, membership systems, and portal websites. I always deliver high-quality, secure, and user-friendly solutions tailored to client needs. My expertise covers front-end and back-end development, responsive design, API integration, database management, and performance optimization. Recently, I also worked on OpenAI API integration for auto-generated articles, images, and social sharing, showing my ability to adopt the latest technologies. If you are looking for a dedicated Web Developer who ensures quality, innovation, and timely delivery, I’d be happy to bring your project to life.
$15 USD 40 gün içinde
4,8
4,8

⚠️ If you're not happy, you don't pay ⚠️ Hello, I make this guarantee because as a Senior Developer with 5+ years of experience, I don't guess—I deliver. I reviewed your requirements for the React web application project. To achieve improved performance and feature enhancement, the best approach is using **React for front-end development**, **Webpack or Vite for bundling**, and **Jest for testing**. This approach ensures better app speed without compromising user experience. I recently built a similar feature set that improved app performance by 30%. I will implement the same approach for your project to boost speed and user satisfaction. 1. Phase 1: Perform app performance audit 2. Phase 2: Implement performance optimizations and new features 3. Phase 3: Continuous monitoring and maintenance I have one specific technical question regarding the current architecture. Are you free for a 10-minute strategy call to discuss this? It will help us hit the ground running. Best regards, Piyush Gupta Senior Web Developer | React Expert
$15 USD 30 gün içinde
4,6
4,6

With over five years of honing my Full Stack skills, my forte lies in crafting powerful and user-friendly web applications - exactly what your project needs. Having built numerous ReactJS applications, I am thoroughly acquainted with modern tooling such as Webpack/Vite, ESLint, Jest— tools mentioned in the project description. This, in combination with my grasp on React hooks and context APIs can ensure quick ramp-up. I am confident in offering measurable speed gains for your application through performance optimization without tampering with existing user flows. Profiling the app to detect slow renders or bottlenecks and rectifying them effectively is a challenge I'm ready to tackle. Moreover, from interactive UIs to powerful backend solutions, I understand that efficiency should be defined across the stack.+-+-+-+-+-+ My clients appreciate not just my technical skills but also my efficiency, cleanliness, and scalable code. Your existing Git repository will be treated with utmost respect. Every intricate change will be documented efficiently to ensure future onboarding is not a pain. Additionally, I assure you 100% client satisfaction with on-time delivery of high quality and robust code. Your project aligns perfectly with what I consider a long-term comfortable fit. Let's create something amazing together without compromising any aspect of your app!
$20 USD 40 gün içinde
4,5
4,5

Hello Stan, I am Vishal Maharaj, a seasoned professional with 20 years of expertise in JavaScript, Software Development, Web Development, and Frontend Development. I have carefully reviewed your project requirements and am confident in my ability to optimize and enhance your React web application. To achieve this, I will begin by thoroughly analyzing the current architecture to identify areas for performance improvement. By profiling the app and addressing slow renders or network bottlenecks, I will deliver measurable speed enhancements without disrupting user experience. Additionally, I will implement new UI/UX features while adhering to existing component patterns and styling conventions. I am eager to discuss the project further and collaborate on creating a robust solution for your React web app. Cheers, Vishal Maharaj
$20 USD 40 gün içinde
5,3
5,3

Hey , I just went through your job description and noticed you need someone skilled in Software Development, Web Development, Agile Development, Git, Frontend Development, Documentation, Webpack and JavaScript. That’s right up my alley. You can check my profile — I’ve handled several projects using these exact tools and technologies. Before we proceed, I’d like to clarify a few things: Are these all the project requirements or is there more to it? Do you already have any work done, or will this start from scratch? What’s your preferred deadline for completion? Why Work With Me? Over 180 successful projects completed. Long-term track record of happy clients and repeat work. I prioritize quality, deadlines, and clear communication. Availability: 9am – 9pm Eastern Time (Full-time freelancer) I can share recent examples of similar projects in chat. Let’s connect and discuss your vision in detail. Kind Regards, Zain Arshad
$15 USD 43 gün içinde
4,0
4,0

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