
Closed
Posted
I need a skilled developer to update the functionality of my web app and make design changes. Specific requirements include: Functionality Updates: - User authentication: Improve security and user experience. - Data processing: Optimize existing processes or add new ones. - API integration: Connect with necessary third-party services. Design Changes: - Layout: Redesign for better usability. - Colors and fonts: Update for a more modern look. - Imagery and icons: Refresh with new graphics and icons. Ideal skills and experience: - Strong background in web development, particularly with functionality updates. - Experience in UI/UX design for creating modern, user-friendly interfaces. - Proficient in API integration. - Knowledge of security protocols for user authentication. Looking for a freelancer who can deliver high-quality work within budget and timeline.
Project ID: 40423726
198 proposals
Remote project
Active 13 hours ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
198 freelancers are bidding on average $14 USD/hour for this job

Hello, I’m Harpreet Singh, a full-stack web developer with experience in improving web app functionality and modernizing UI/UX design. I can help with both the technical upgrades and design improvements you’ve outlined: Functionality Updates Improve and secure user authentication (better UX + security practices) Optimize or extend data processing workflows Integrate third-party APIs as required Ensure stable, efficient frontend-backend communication Design Improvements Redesign layout for better usability and flow Modernize colors, typography, and spacing Refresh icons and visuals for a clean, modern interface Improve responsiveness across devices Focus Secure, maintainable implementation Clean UI aligned with modern standards Performance and usability improvements without disrupting existing features I’m available to start immediately, and timeline and budget can be discussed based on your current setup and scope. Warm regards, Harpreet Singh
$8 USD in 50 days
9.4
9.4

⭐⭐⭐⭐⭐ Proposal for Web App Functionality & Design Overhaul. Dear Valuable Client, CnELIndia is excited to deliver your required updates with high-quality results on time and within budget. We fully understand your needs: strengthen user authentication security and UX, optimize data processing or add new flows, integrate third-party APIs. On design, we will redesign layout for better usability, refresh colors and fonts for a modern look, and update imagery plus icons with fresh graphics. Our expert team excels in JavaScript, CSS, HTML, frontend/backend development, UI/UX design, and secure API integration. Steps CnELIndia team will take for success: hold detailed requirements call within 48 hours; create tailored project plan with milestones; execute iterative development with weekly demos; conduct full security, performance, and usability testing; deliver deployment plus 30-day post-launch support. We guarantee a modern, secure, user-friendly web app. Let's discuss next steps today.
$12 USD in 40 days
8.8
8.8

Hi there, I read your Web App Functionality & Design Overhaul brief and I’m confident I can deliver a modern, secure, and user-friendly upgrade. I bring 15+ years of full-stack experience with robust authentication improvements, API integrations, data processing optimization, and UI/UX enhancements that balance aesthetics with usability. I’ll redesign the layout, update colors/fonts, and refresh imagery to create a clean, responsive interface while tightening security and streamlining workflows behind the scenes. 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. I’ll propose a phased plan: secure login improvements, data-processing optimizations, API wiring, then a front-end redesign with a modern visual language. What is the priority authentication approach you want to start with (e.g., MFA, passwordless, or standard 2FA) and which third-party APIs are must-haves for the initial integration? Looking forward to your reply so we can finalize the exact plan. Best regards, Asad
$10 USD in 17 days
8.1
8.1

Hello, I have thoroughly reviewed your project description and am confident in my ability to assist you in completing it successfully. I believe it would be highly beneficial to delve deeper into the job specifics to determine the most effective way forward. I am open to scheduling an interview at your convenience, and I genuinely appreciate the chance to collaborate with you on this project. Your response is eagerly anticipated, and I'm excited about the prospect of working together. Thank you for considering my proposal. Looking forward to your prompt reply! Best regards Rekha!!!
$12 USD in 40 days
7.9
7.9

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, CSS, User Interface / IA, HTML, UI / User Interface, Web Development, Backend Development, Frontend Development, API Integration, Web Application 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.
$20 USD in 5 days
8.7
8.7

Einnovention is truly the encapsulation of your perfect development team for this project. With a team that's comprised not just of exceptional developers but also of designers and digital experts, we bring a unique multi-dimensional approach to all our projects. This is essential when we talk about the overhaul of a web application that needs an update in both functionality and design. We understand that these two factors go hand-in-hand and ensure a seamless user experience, hence our in-depth understanding in both fields will positively aid your project. Our work culture revolves around transparent communication, meeting milestones, and delivering on time, all while adhering to your budget. As a business owner myself, I understand how important it is to receive a high-quality product at a reasonable cost, without any unnecessary complications or delays. Our extensive range of skills extends from API integration and javascript to CSS and HTML, which are exactly the skill set you're looking for your web app. With 248 successfully completed projects and a 4.9/5 rating on Freelancer.com, our work speaks for itself. Let us bring these skills combined with our experience in creating modern, user-friendly interfaces as well as ensuring secure connections—which aligns perfectly with your vision to deliver a top-notch functioning and aesthetically refreshed product within all the necessary frameworks.
$12 USD in 40 days
7.8
7.8

HI! I am an expert web programmer. I have a lot of work experience in Laravel, Codeigniter, PHP, Wordpress, JavaScript, HTML, Vuejs, Reactjs, React Native, and MySQL.I can start right away. I want to discuss this project in detail. Please contact me to discuss more regarding this project. For more details Chat with me
$12 USD in 40 days
7.6
7.6

Greetings, I see that you're looking to enhance both the functionality and design of your web app. From what you've described, it’s important to create a more secure user authentication system and optimize data processing while integrating necessary APIs. For the design, refreshing the layout, colors, and icons is key to improving user experience. With my background in web development, I have successfully implemented similar functionality updates and modernized UI/UX designs. I prioritize user security and ensuring seamless interactions, which will help your app stand out. By focusing on both the technical and aesthetic aspects, I can make sure that your users have a smooth and engaging experience. I’m excited about the opportunity to work together and transform your web app into something even better. Best regards, Saba Ehsan
$12 USD in 40 days
7.1
7.1

Hi there To overhaul an existing web app properly, the most critical part is improving functionality and design without disrupting the workflows users already depend on. I’ll approach this by first reviewing the current authentication flow, data processing logic, API structure, and UI pain points before making changes. The redesign should improve usability, layout, colors, fonts, icons, and responsiveness, while the backend updates should make authentication more secure, data handling more reliable, and third-party integrations easier to maintain. This means I understand the project is not just a visual refresh. It needs careful coordination between frontend, backend, security, API behavior, and user experience. My process starts with a code and UI audit, then moves into prioritized functionality fixes, authentication improvements, API integration, design updates, responsive testing, and final cleanup. If it aligns with you, let’s discuss in detail via private chat.
$20 USD in 40 days
7.3
7.3

Hi, We’ve developed several web apps with user authentication, data processing, and API integrations, so we know how to make these features secure and user-friendly. We also have a dedicated UI/UX designer who can create modern, responsive designs that enhance usability. For your project, I’d suggest using Laravel for the backend and Vue.js for the frontend. This combination allows us to build a fully optimized web app with fast, responsive front-end views. Let’s schedule a 10-minute 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
$15 USD in 40 days
7.1
7.1

Hi I can update your web app’s functionality and refresh the design so it becomes more secure, faster, and easier for users to navigate. The main technical challenge is improving authentication, data processing, API integrations, and UI/UX without breaking the existing app logic or user flow. I can review the current codebase, strengthen login security, improve validation, optimize backend data handling, and connect any required third-party APIs. On the design side, I can modernize the layout, colors, typography, icons, imagery, spacing, and responsive behavior for a cleaner user experience. I can work with React, Vue, Node.js, Laravel, REST APIs, databases, authentication workflows, and modern UI frameworks depending on your current stack. The final result will be a more polished, stable, and maintainable web app with improved usability and stronger technical foundations. Thanks, Hercules
$50 USD in 40 days
7.1
7.1

YOUR WEB APP DOESN’T JUST NEED A VISUAL REFRESH — IT NEEDS A SMART UPGRADE IN PERFORMANCE, SECURITY, AND USER EXPERIENCE. With 12+ years of experience in full-stack web development, UI/UX modernization, and API-driven platforms, we can help transform your existing application into a faster, cleaner, and more scalable product. What We Can Improve: • User Authentication * Enhanced security (JWT/OAuth/2FA) * Improved login/signup UX * Session & access management optimization • Data Processing * Performance optimization * Workflow improvements * Cleaner backend logic and scalability • API Integrations * Third-party service integrations * REST/GraphQL APIs * Secure and maintainable architecture Design & UI/UX Enhancements: • Modern responsive layout redesign • Updated typography, color palette & branding • Improved spacing and usability • Refreshed imagery, icons, and visual hierarchy • Better mobile and tablet experience We focus on clean code, maintainable architecture, fast delivery, and consistent communication throughout the project. Ready to review your current app and provide a practical roadmap immediately.
$10 USD in 40 days
7.4
7.4

Hello, I came across your requirement for updating both the functionality and overall design of your web app, and it looks like the kind of work we handle regularly for growing platforms that need better usability and smoother performance. From your requirements, I understand the focus is not only on refreshing the interface but also improving the core experience for users. We can help strengthen the authentication flow with better security and cleaner user interaction, optimize the existing data processing logic for speed and reliability, and integrate the required third party APIs in a stable and scalable way. On the design side, we can rework the layout to make the app more intuitive and modern without making it feel overly complex. We also have UI designers who can refresh the colors, typography, icons, and graphics while keeping the product clean and user friendly. Our team has experience working on ongoing web app improvements where both development and design need to move together smoothly. We usually begin by reviewing the current setup, identifying pain points, and then planning updates in phases so the transition remains stable. Happy to discuss the existing tech stack, current challenges, and timeline if you would like to take this further. Thanks
$10 USD in 40 days
7.4
7.4

Hello Hi there, I see you need to update your existing functionality. With 5+ years of full-stack experience, I specialize in enhancing and modernizing features to improve performance and user experience. I'm confident I can deliver a smooth update that meets your needs. Let's connect to discuss the specifics and get this project moving. Giáp Văn Hưng
$15 USD in 7 days
6.8
6.8

Hello, I'd be happy to help refine your web app by improving the core features and refreshing the overall design. I can update the authentication flow, optimize data handling, and integrate the APIs you need while keeping everything smooth and user‑friendly. I’ll also redesign the layout with modern visuals, cleaner colors, and updated icons so the whole app feels more polished and intuitive. Thanks, Teo
$25 USD in 16 days
6.8
6.8

Hello, With 4 years of experience in Web Development, Frontend and Backend Development, UI/UX Design, and API Integration, I can assist in revamping your web app. I understand the need for enhancing user authentication, optimizing data processing, and integrating APIs for seamless functionality. Additionally, redesigning layouts, updating colors/fonts, and refreshing imagery/icons are within my expertise. Having reviewed your requirements, I am confident in delivering a professional solution. I specialize in JavaScript, CSS, HTML, and have a keen eye for UI/UX design. Let's discuss further details in chat to ensure a successful project completion. Best regards, Taimoor from Pixels Soft Looking forward to connecting in chat for further discussion.
$12 USD in 40 days
6.8
6.8

Hello, To turn your web app from a functional tool into a high-performance asset, I’ll architect a seamless transition between "under-the-hood" security and a high-conversion interface. I’ll start by upgrading your authentication with secure JWT/OAuth 2.0 flows to improve security and simplify onboarding. Then, I’ll optimize performance by converting slow synchronous processes into efficient async workflows, keeping your app fast and responsive even during heavy API activity or complex operations. I’ll elevate the UI with a cohesive design system using the 60-30-10 color rule and a refined typography hierarchy to reduce cognitive load and improve clarity. On the backend, I’ll make third-party integrations resilient and fail-safe so external delays never disrupt the core user experience. Happy to review your current app and discuss the exact updates you need. Best, Niral
$10 USD in 40 days
6.8
6.8

Hello, I am interested in your project for the web app functionality and design overhaul. With my extensive experience in both frontend and backend development, I can ensure the updates you need are implemented effectively. I specialize in JavaScript, HTML, CSS, and various frameworks, which will help enhance your web app's functionality and user interface. Let's work together to make your app more user-friendly and visually appealing. I have a few questions to better understand your requirements: Q1: What specific functionalities do you want to update in your web app? Q2: Are there any design inspirations or examples you would like me to consider? Q3: What is your timeline for completing these updates? Looking forward to your response! Best regards, [Your Name]
$15 USD in 10 days
6.1
6.1

I can enhance your web app’s functionality with secure authentication, optimized data processing, and seamless API integrations while modernizing the UI with improved layout, updated branding, and refreshed visuals for a polished user experience. I focus on scalable, high-quality development that balances performance, security, and design within deadline. Best Regards, Muhammad
$12 USD in 40 days
6.2
6.2

Hi I can enhance your web app by improving both functionality and design while keeping everything stable and scalable. I will upgrade your authentication system with better security and smoother user flows, optimize data processing for performance, and integrate any required APIs cleanly into your existing architecture. On the design side, I will modernize the layout, refine typography and color usage, and update visuals to create a more intuitive and polished user experience. My approach ensures that UI improvements align with functionality so the app feels faster and easier to use. I focus on clean code, performance, and maintainability, delivering a solution that not only looks better but works more efficiently and securely. Best, Justin
$50 USD in 40 days
6.3
6.3

Kuwait City, Kuwait
Member since May 6, 2026
$25-50 USD / hour
$15-25 USD / hour
₹100-400 INR / hour
$30-250 USD
$250-750 AUD
$10-30 USD
₹1500-12500 INR
€750-1500 EUR
€250-750 EUR
$15-25 AUD / hour
min $100 AUD / hour
₹1500-12500 INR
₹600-1500 INR
$15-25 USD / hour
$10-30 AUD
$8-15 USD / hour
$2-8 USD / hour
₹12500-37500 INR
€30-250 EUR
₹12500-37500 INR