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We’re building the next-generation web version of an established product and are looking for an experienced Front-End Developer to help lead the rollout. You’ll work primarily with React, [login to view URL], and TypeScript, building the interfaces our customers use every day. The frontend integrates with an existing C#/.NET REST API backed by SQL Server. You won’t be responsible for modifying the API or database, but you should be comfortable understanding relational data structures and working closely with backend developers when API or data issues arise. What You’ll Do Build and maintain production UI features using React and [login to view URL] Work with [login to view URL] App Router, SSR, routing, server/client components, and modern data-fetching patterns Integrate frontend functionality with an existing C#/.NET REST API Translate product requirements and designs into responsive, accessible, production-quality interfaces Handle complex data-driven screens, forms, tables, filtering, validation, and regional/business rules Identify API limitations, edge cases, inconsistent data, and missing requirements early Write clean, maintainable, reusable, and well-tested TypeScript code Participate in code reviews and contribute to frontend architecture decisions Maintain strong frontend performance and good Core Web Vitals Collaborate effectively with a distributed, remote team What We’re Looking For 3–5+ years of professional frontend development experience Strong production experience with React Strong hands-on experience with [login to view URL], particularly App Router and modern rendering/data-fetching patterns Strong JavaScript and TypeScript fundamentals Excellent HTML5 and modern CSS skills Experience building complex, data-heavy business applications Strong understanding of component architecture, state management, reusable UI patterns, and frontend performance Experience consuming and debugging REST APIs developed by another team Comfortable understanding relational concepts such as schemas, relationships, joins, IDs, and normalized data Ability to work independently in an async/remote environment Strong communication skills and willingness to flag technical blockers early Nice to Have Experience with .NET/C# REST APIs Experience with SQL Server-backed applications Experience building or maintaining a design system or component library Automated testing with Jest, React Testing Library, Playwright, or Cypress Familiarity with CI/CD, Git, pull requests, and code-review workflows Experience with CRM, construction, ERP, operations, or B2B SaaS platforms Experience optimizing large tables, dashboards, search/filter interfaces, or other data-intensive UIs Logistics Fully remote Ongoing product development with the opportunity for long-term collaboration How to Apply Please lead with relevant technical experience rather than a generic introduction. In particular, tell me: What production React or [login to view URL] applications you have shipped Whether you have worked on applications involving complex regional, relational, CRM, or business data How you approached frontend performance as the application and dataset grew How you typically structure API integration, state, loading/error handling, and reusable components Which testing tools you use in production Please include live product links or GitHub repositories where possible. Relevant examples will carry significantly more weight than a polished generic proposal.
Project ID: 40644511
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165 freelancers are bidding on average $42 USD for this job

Hello, I’m excited about the opportunity to help build the next-generation web version of your product. With 7+ years of frontend development experience, I've successfully shipped production applications using React and Next.js. I understand the importance of creating responsive, user-friendly interfaces that seamlessly integrate with existing APIs while ensuring strong performance and accessibility. My approach focuses on clean, maintainable TypeScript code, and I prioritize handling complex data-driven screens effectively. Collaborating closely with backend developers has been essential in my past projects, especially when addressing API limitations and ensuring the data flows smoothly. One question I have is how your current API is structured in terms of data relationships, as this can significantly impact the frontend integration and performance. Best regards, Ivan Mandinski
$15 USD in 1 day
7.5
7.5

Hello It sounds like you’re aiming to bridge the gap between desktop performance and web accessibility for your next-generation platform. Managing that level of complexity requires architectural precision to ensure the user experience remains seamless. I have successfully scaled similar high-performance web applications by optimizing rendering pipelines and state management. I would love to walk you through how we can stabilize your build and push your feature roadmap forward. Are you available for a brief chat this week? Giáp Văn Hưng
$140 USD in 7 days
6.9
6.9

I am an expert React and Next. js developer with over five years of experience building high performance web applications. I specialize in migrating legacy systems to modern stacks, making me an ideal fit for the next generation web version of your established product. My background includes building scalable frontends using Next. js, GraphQL, and Node. js with a focus on core web vitals and clean architecture. I have successfully converted jQuery based sites into optimized React applications while maintaining feature parity and improving user experience. I am comfortable working within your budget and can start immediately to ensure a seamless transition for your product. When would be a good time to discuss your technical requirements and project timeline in more detail?
$90 USD in 7 days
6.3
6.3

Hello! We can provide an external developer for your current frontend tasks. 1. Are you open to working with an external contractor or team for these tasks? 2. Which tasks and technologies need to be covered first? — About us We are dZENcode – a full-cycle IT company for digital product development: from design and programming to integrations and post-release support. We build projects from scratch and also work on existing solutions that need further development, improvements, or technical support. You can find detailed information about our services and rates on our official website: https://dzencode.com. Please review it – after that, we can discuss the details and agree on the next step. ⚠️ After clarifying all details, we will define the scope, the suitable cooperation format – task-based, outsourcing, or outstaffing – and the final cost. Projects are guaranteed to reach release with us: • 10+ years providing IT services; • 90+ in-house specialists; • 250+ public reviews since 2015; • We support products under SLA after launch; • We work under NDA and a company contract!
$20 USD in 7 days
6.7
6.7

Your biggest rollout risk is inconsistent API data reaching complex regional screens too late. Relevant frontend work includes Zipline with React, SvelteKit, Tailwind, and GSAP. For this rollout, I’d first map the existing .NET endpoints and relational IDs against the highest-value UI flow, then structure typed API adapters, reusable components, and explicit loading, empty, validation, and error states. With App Router, I’d keep interactive state behind narrow client boundaries so data-heavy pages don’t become oversized client bundles. As datasets grow, I’d profile rendering before optimizing, then address table virtualization, request deduplication, pagination, and filter behavior where measurements justify it. Business rules would get focused Jest/React Testing Library coverage, with Playwright for critical workflows. Which existing screen best exposes the regional rules and API edge cases you’re most concerned about?
$30 USD in 7 days
5.8
5.8

Hello Dear! Good Day! Hope you are doing fine. This is Ruhul Ajom Sagor. I am an expert "Web Developer" with 10+ years of working experience in PHP, HTML5, CSS3, JavaScript, jQuery, Bootstrap, MySql and different Frameworks. I have completed my B.S.C Engineering in Computer Science and Engineering (CSE) from BUET. Hire me and you don't have to worry about your website problems again! I'll add value to your projects by creating astonishing designs and code with high impact and optimized user interaction that leads to bigger conversions. WHAT PROBLEMS CAN I HELP YOU SOLVE? • Custom Websites Using PHP and Frameworks • e-Commerce Websites (Woo-Commerce and Shopify) • Custom WordPress themes • On-Page and Off-Page SEO • WordPress themes Customization • Database Modeling/Development • WordPress migrations and upgrades • Responsive Coding (Make your website compatible with: smartphones, tablets, desktops) • Websites speed and loading time improvements • Cross-browser compatibility • PSD to HTML to WordPress conversion • HTML5/CSS3/jQuery websites based on Bootstrap I love challenges, talking to my clients, and meeting others’ standards as well as expectations. I will be discussing everything in detail, giving my full advice and delivering through best of my skills. You are cordially welcome to discuss your project. Thank You! Best Regards, Ruhul Ajom
$20 USD in 1 day
5.2
5.2

Hi, Thanks for sharing your project. It aligns well with work I’ve successfully completed for other clients, and I’m confident I can deliver a high-quality solution tailored to your requirements. Before providing an accurate timeline, scope, and budget, I’d like to clarify a few key details to ensure we're aligned from the start. Freelancer’s proposal character limit makes it difficult to cover everything thoroughly here. If you're available, let's connect via chat. I can walk you through similar projects I've completed, discuss the best approach for your specific requirements, and answer any questions you may have. Once I understand your expectations, I'll provide a clear execution plan with realistic timelines and pricing. I’m ready to get started as soon as we finalize the details and look forward to working with you. Best regards, Mayank Sahu
$20 USD in 7 days
4.0
4.0

Hi, hope you are well. I understand your project details. I will follow instructions and keep you updated. I am a skilled freelancer with 5 years of experience in CSS, HTML, Node.js, Frontend Development, React Native and I have completed similar projects. Feel free to visit my profile to check latest work and feedback from clients. I would love to connect in chat to discuss details. Warm regards.
$30 USD in 2 days
3.4
3.4

Hi, Thanks for sharing your project. It aligns well with work I’ve successfully completed for other clients, and I’m confident I can deliver a high-quality solution tailored to your requirements. Before providing an accurate timeline, scope, and budget, I’d like to clarify a few key details to ensure we're aligned from the start. Freelancer’s proposal character limit makes it difficult to cover everything thoroughly here. If you're available, let's connect via chat. I can walk you through similar projects I've completed, discuss the best approach for your specific requirements, and answer any questions you may have. Once I understand your expectations, I'll provide a clear execution plan with realistic timelines and pricing. I’m ready to get started as soon as we finalize the details and look forward to working with you. Best regards, Royal IT service
$20 USD in 7 days
0.1
0.1

Hello, I’ve read your project description carefully and understand what you’re looking for. With over 5 years of experience in frontend development, I have successfully shipped multiple production applications using React and Next.js. Notably, I developed a CRM platform that involved complex regional data management, ensuring high performance and responsiveness as the dataset grew. My approach to API integration includes structured state management, effective loading/error handling, and reusable component architecture. I emphasize frontend performance by employing optimization techniques like code splitting and lazy loading, and I utilize Jest and React Testing Library for automated testing to ensure reliability. I’m available to start immediately and can provide regular updates throughout the project. Let’s discuss the details and get started. I’m ready to begin. Best regards, iekeraamc
$15 USD in 7 days
0.0
0.0

Having read your project description, I couldn't help but acknowledge how closely aligned my skills in HTML5, JavaScript and deep experience with React.js are to your requirements. With 3+ years of experience in front-end development, I have a solid understanding of component architecture and state management, which lend themselves well to building robust, data-driven interfaces - much like what's needed for your project. Additionally, my strengths in TypeScript align perfectly with the need for clean, maintainable and well-tested code that you're looking for. The fact that I also have a background in developing Rest APIs lends itself perfectly to integrating the frontend functionality with an existing C#/.NET REST API, empowering me to scope out limitations, handle inconsistencies and collaborate effectively with backend developers for smooth integration. As someone who's excelled at working independently and remotely, matching the needs of logistics is not just something I can achieve but excel at. Lastly, but not exhaustively, my expertise also extends to Firebase, Google APIs and payment gateway integrations so I'm well-prepped for any of these additional requests. Overall, as a Full-Stack Developer proficient with React.js, TypeScript and connecting complex data, I believe I have the ideal skill set to streamline your product's frontend development and push it towards success!
$10 USD in 1 day
0.0
0.0

? I spotted something in your project that others will likely overlook. A key challenge in building the next-generation web version of your product will be ensuring seamless integration with the existing C#/.NET REST API, particularly when dealing with edge cases or inconsistent data that can arise in complex applications. In a recent project, I successfully led the frontend development of a data-heavy CRM application using React and Next.js. By implementing robust API integration and focusing on clean, maintainable TypeScript code, we achieved a 30% improvement in frontend performance while enhancing user experience. I understand your goal is to develop responsive, accessible interfaces that handle complex data-driven requirements. My approach involves thorough testing of API interactions, early identification of limitations, and implementing modern data-fetching patterns to ensure optimal performance and reliability. I prioritize practical solutions and long-term maintainability, ensuring that the codebase remains clean and that performance metrics meet industry standards. I'd rather earn this with clarity than win it with promises. Regards Brendan
$15 USD in 7 days
0.0
0.0

Hi js. Often, the challenge lies in setting up efficient server-side rendering and optimizing load speeds. js's auto code-splitting and API routes are perfect tools for this. I've worked on a SaaS app where I integrated GraphQL for data fetching, leading to a 30% faster response time. Your focus on using modern frameworks like React Native and GraphQL resonates with my experience. It's great to see you're committed to leveraging these powerful tools. I'm confident in refining your setup to achieve excellent results. Let's connect, and I'll walk you through how we can tailor these technologies for your project. Thanks, Shammi
$20 USD in 7 days
0.0
0.0

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