$12,000.00 Fixed
We are seeking a skilled JavaScript Developer with strong experience in modern frontend development, API integration, performance optimization, and scalable architecture. This is a one-time project involving the creation of a sleek, responsive, high-performance web application with full UI functionality, modular components, and integration with backend APIs.
This role requires a developer who understands not only JavaScript fundamentals, but also modern frameworks, clean code structure, asynchronous operations, browser performance tuning, security best practices, and cross-platform compatibility. You'll collaborate with our design and backend teams to translate UI wireframes, business logic, and REST API endpoints into production-ready features.
Your responsibilities will include building reusable UI components, optimizing rendering behavior, managing state flows, implementing API calls, validating user inputs, handling authentication flows, and ensuring the overall experience feels smooth, consistent, and polished. Testing, debugging, and documentation will also be core parts of this role.
We prioritize developers who are detail-oriented, communicate clearly, and understand the importance of building scalable, maintainable codebases. Code should be readable, modular, and easy for future engineers to extend.
This project spans 8–10 weeks, with clear milestones, weekly check-ins, and measurable goals. You will be expected to deliver high-quality output, follow modern development standards, and ensure the final product performs well on all major browsers and devices.
If you’re passionate about JavaScript, UI engineering, app performance, and solving real-world user experience challenges, then we’d love to work with you.
✅ Responsibilities (15 points)
Develop modular, reusable JavaScript components
Convert UI/UX designs into responsive layouts
Integrate REST APIs with secure fetch/axios requests
Implement form validation and input sanitization
Manage state using Redux, Zustand, or Context
Optimize for speed, performance, and accessibility
Implement authentication flows (JWT/OAuth)
Write clean, documented code with comments
Debug and resolve cross-browser issues
Ensure mobile responsiveness across devices
Work with Git/GitHub for version control
Conduct unit tests and integration tests
Build using Webpack/Vite bundlers
Follow WCAG accessibility guidelines
Document modules, APIs, and workflows
✅ Required Skills (15 points)
Expert in JavaScript ES6+
Strong understanding of DOM & browser APIs
Knowledge of at least one major framework (React/Vue/Angular)
Experience with REST API integration
Familiarity with async/await & promises
Experience with HTML5/CSS3
Strong debugging skills
Knowledge of Git/GitHub
Familiarity with Webpack/Vite
Understanding of CORS, tokens, and session flows
Unit testing with Jest or Mocha
Performance optimization techniques
Modular architecture & clean code
Basic security understanding (XSS, CSRF prevention)
Experience using Postman/Insomnia
✅ Tools & Technologies
JavaScript ES2022+
React / Vue / Next.js (optional)
REST API (JSON)
Git & GitHub
VS Code
Webpack / Vite
Node.js (for tooling)
Postman, Swagger
Jest / Testing Library
✅ Deliverables
Fully functional JavaScript-based web interface
Component library & reusable UI elements
API-integrated modules
Form validations & authentication logic
Documentation (README + code comments)
Test cases & coverage report
Deployment-ready build
1–2 revision cycles
✅ Budget
Hourly: $35–65/hr
Project: $5,000–12,000
Monthly (optional extension): $3,000–6,000
✅ Timeline
Total duration: 8–10 weeks
Week 1–2: Setup, UI structure
Week 3–6: Feature development + APIs
Week 7–8: Testing & optimization
Final: Deployment + documentation
✅ Success Metrics
Page load under 2 seconds
95%+ test pass rate
0–1% error logs in console
Smooth UX across all major browsers
Pixel-perfect UI matching designs
Stable API integrations with <150ms response time
- Proposal: 0
- Less than 3 month
