Hire the Best JavaScript Developers
in the United Kingdom

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Rating is 4.8 out of 5.
4.8/5
Based on 1,486 client reviews
Siddharth G.

Leicester, United Kingdom

$25/hr
5.0
4 jobs

I am a Senior Full Stack Developer specializing in the analysis, design, and delivery of scalable, high-performance software. With a deep foundation in Object-Oriented Programming (OOP), system design, and cutting-edge artificial intelligence, I bridge the gap between complex backend logic, cloud-native infrastructure, and intuitive frontend experiences. Core Expertise - AI & Intelligent Systems: Hands-on experience in LLM development, fine-tuning, and embedding vector-based search workflows to build context-aware systems. Expert in architecting autonomous AI Agents capable of tool use, multi-step reasoning, and seamless integration into enterprise backend pipelines. - AI-Driven Development: Proactive in leveraging advanced AI tools and LLM pair-programming methodologies to accelerate the entire software development lifecycle, automate repetitive tasks, and optimize code quality. - Microservices & Architecture: Expert in decomposing complex monoliths into resilient, event-driven Microservices and implementing Micro Frontend architectures to enable decoupled scaling and independent deployment cycles. - Backend Engineering: High proficiency in building robust, low-latency APIs and distributed systems using Node.js, Python, C#, and C++. - Frontend Excellence: Extensive experience in designing responsive, modular UIs with React, Angular, and VanillaJS, focusing on layout precision and fluid user experiences. - Cloud & DevOps: Proven track record in cloud-native development across both AWS and Azure ecosystems, leveraging container orchestration, serverless functions, and CI/CD pipelines to automate infrastructure delivery. - Quality & Practices: Passionate advocate for Test-Driven Development (TDD), clean code principles, and the strategic application of Design Patterns to ensure highly maintainable, stable codebases.

  • Node.js
  • React
  • AI Development
  • Web Development
  • iOS Development
  • Android App Development
  • TypeScript
  • Next.js
  • React Native
  • AWS Development
  • Microsoft Azure
  • Docker
  • Kubernetes
  • Python
  • AI Agent Development
  • Shipping & Order Fulfillment Software
  • Voice Recording
  • VoIP Software
Wasiq C.

Wakefield, United Kingdom

$35/hr
4.9
253 jobs

Senior Full Stack Web & Mobile App Developer | Contract & Remote Specialist With 15+ years of experience and over 4,000 hours worked on Upwork, I help businesses build scalable, secure, and high-performance web and mobile applications that deliver measurable results. I specialise in PHP, Laravel, React, Node.js, Flutter, AWS, and AI/ML integration creating tailored solutions that meet your current needs and grow with your business. ๐Ÿ’ผ Core Services Full Stack Web Development โ€“ PHP, Laravel, React, Vue.js, Nuxt.js, Node.js, TypeScript, Angular Mobile App Development โ€“ Flutter, React Native, cross-platform, native iOS & Android Cloud Integration & Deployment โ€“ AWS, Google Cloud, serverless architecture, CI/CD pipelines AI/ML Integration โ€“ Hugging Face, Python, NLP, automation workflows E-Commerce Solutions โ€“ WooCommerce, Shopify, OpenCart, Magento, custom SaaS platforms Legacy System Modernisation โ€“ performance optimisation, security hardening, migration to cloud ๐Ÿ† Why Clients Hire Me Proven Track Record: 217+ successful projects and $100K+ earned on Upwork Enterprise Experience: Delivered solutions for Holland & Barrett, NHS, and other global brands Industry Expertise: Healthcare, E-learning, FinTech, Retail, SaaS, and more End-to-End Delivery: From initial concept to deployment, with ongoing support Strong Communication: Clear updates, quick responses, and deadline-focused delivery ๐Ÿ“Œ Technology Stack & Tools Languages & Frameworks: PHP, Laravel, JavaScript, TypeScript, React, Vue.js, Nuxt.js, Node.js, Flutter, Angular Databases: MySQL, MongoDB, SQL Server Cloud Platforms: AWS, Google Cloud Version Control: Git, SVN AI/ML Tools: Hugging Face, TensorFlow, Python ๐Ÿ’ก Letโ€™s Build Something Great Whether you need a full-stack partner for a new build, a mobile app expert to reach more customers, or cloud & AI-powered solutions to modernise your systems, I can help. ๐Ÿ“ฉ Letโ€™s discuss your project today and bring your vision to life.

  • JavaScript
  • Node.js
  • React
  • React Native
  • PHP
  • User Authentication
  • Flutter
  • Laravel
  • Mobile App Development
  • Firebase Realtime Database
  • API Development
  • WordPress
  • Web Development
  • Full-Stack Development
  • Vue.js
Muhammad H.

Whitefield, United Kingdom

$30/hr
4.6
36 jobs

WordPress Developer specializing in website redesigns, speed optimization, WooCommerce improvements, bug fixing, responsive design, and custom PHP/MySQL functionality. My recent Upwork work includes WooCommerce store audits, WordPress performance optimization, Elementor 500 error recovery, homepage redesigns, Figma to WordPress builds, custom calculator functionality, and WordPress/MySQL/PHP-based improvements. Clients usually come to me when their website looks outdated, loads slowly, breaks on mobile, has checkout or WooCommerce issues, or needs a clean redesign without messy workarounds. My focus is simple: fix the real problem, improve the user experience, and leave the website stable, responsive, and easy to manage. Core services: โ€ข WordPress Development โ€ข WordPress Website Design โ€ข Website Redesign โ€ข WooCommerce setup, audit, and optimization โ€ข WordPress Speed Optimization โ€ข Website Performance Optimization โ€ข WordPress Customization โ€ข Landing Page Design โ€ข Responsive Design fixes โ€ข Bug Fix and troubleshooting โ€ข WordPress Migration โ€ข Website Maintenance โ€ข Figma to WordPress development โ€ข PSD to WordPress development โ€ข Custom WordPress functionality using PHP/MySQL Recent clients have described my work as professional, reliable, detail-oriented, solution-oriented, and easy to communicate with. Iโ€™ve completed WordPress and WooCommerce projects involving technical audits, frontend redesigns, performance cleanup, Elementor fixes, and custom functionality with 5-star outcomes. A strong WordPress website should load quickly, look professional, work smoothly across devices, and support real business goals. That is the standard I follow on every project. If your WordPress website needs a redesign, WooCommerce audit, speed improvement, bug fix, landing page, custom functionality, or Figma/PSD to WordPress development, send me the site link or design file and Iโ€™ll review the best way to move forward.

  • JavaScript
  • WordPress
  • WordPress Website
  • WordPress Website Design
  • WordPress Customization
  • WooCommerce
  • WordPress Optimization
  • Website Performance Optimization
  • Website Redesign
  • WordPress Landing Page
  • Landing Page Design
  • Responsive Design
  • Bug Fix
  • Website Maintenance
  • WordPress Migration
  • WordPress Plugin
  • Elementor
  • Figma
  • PHP
  • CSS
Noor A.

Huddersfield, United Kingdom

$27/hr
5.0
2 jobs

Building scalable, high-performance ๐€๐ง๐ ๐ฎ๐ฅ๐š๐ซ, ๐‘๐ž๐š๐œ๐ญ, ๐š๐ง๐ ๐๐ž๐ฑ๐ญ.๐ฃ๐ฌ ๐š๐ฉ๐ฉ๐ฅ๐ข๐œ๐š๐ญ๐ข๐จ๐ง๐ฌ for SaaS platforms, enterprise teams, dashboards, admin panels, and modern web products. Many frontend applications struggle with slow performance, poor architecture, inconsistent UI, complex state management, and code that becomes hard to maintain as the product grows. I help companies solve these problems by building clean, scalable, and production-ready frontend applications using ๐€๐ง๐ ๐ฎ๐ฅ๐š๐ซ, ๐‘๐ž๐š๐œ๐ญ, ๐๐ž๐ฑ๐ญ.๐ฃ๐ฌ, ๐“๐ฒ๐ฉ๐ž๐’๐œ๐ซ๐ข๐ฉ๐ญ, ๐‰๐š๐ฏ๐š๐’๐œ๐ซ๐ข๐ฉ๐ญ, ๐๐ ๐‘๐ฑ, ๐‘๐ž๐๐ฎ๐ฑ, ๐‘๐ฑ๐‰๐’, ๐€๐ง๐ ๐ฎ๐ฅ๐š๐ซ ๐Œ๐š๐ญ๐ž๐ซ๐ข๐š๐ฅ, ๐Œ๐š๐ญ๐ž๐ซ๐ข๐š๐ฅ ๐”๐ˆ, ๐“๐š๐ข๐ฅ๐ฐ๐ข๐ง๐ ๐‚๐’๐’, ๐‘๐„๐’๐“ ๐€๐๐ˆ๐ฌ, ๐š๐ง๐ ๐€๐ณ๐ฎ๐ซ๐ž ๐€๐๐ˆ ๐ข๐ง๐ญ๐ž Iโ€™m a Senior Frontend Engineer with 10+ years of experience building enterprise web applications across healthcare, insurance, logistics, analytics, SaaS, dashboards, and business platforms. My work focuses on frontend architecture, Angular development, React development, Next.js frontend development, responsive UI, performance optimization, reusable component systems, API-integrated applications, frontend modernization, and scalable UI engineering. Iโ€™ve improved frontend performance by around 30%, built reusable Angular Material component libraries for multiple teams, integrated complex REST/Azure APIs, and helped teams reduce technical debt through cleaner, maintainable frontend architecture. ๐€๐ง๐ ๐ฎ๐ฅ๐š๐ซ ๐ƒ๐ž๐ฏ๐ž๐ฅ๐จ๐ฉ๐ฆ๐ž๐ง๐ญ โœ” Angular 6โ€“18 development โœ” Enterprise Angular applications โœ” Angular Material UI โœ” NgRx state management โœ” RxJS implementation โœ” Lazy loading and modular architecture โœ” Angular migration and modernization โœ” Angular performance optimization โœ” Micro-frontend architecture โœ” Reusable Angular component libraries ๐‘๐ž๐š๐œ๐ญ & ๐๐ž๐ฑ๐ญ.๐ฃ๐ฌ ๐ƒ๐ž๐ฏ๐ž๐ฅ๐จ๐ฉ๐ฆ๐ž๐ง๐ญ โ–ถ React.js frontend development โ–ถ Next.js applications with SSR and SSG โ–ถ TypeScript-based frontend architecture โ–ถ Redux, React Hooks, Context API โ–ถ SaaS frontend development โ–ถ Dashboard and admin panel UI โ–ถ API-driven React applications โ–ถ Modern frontend UI development โ–ถ Responsive and SEO-friendly frontend systems ๐…๐ซ๐จ๐ง๐ญ๐ž๐ง๐ ๐€๐ซ๐œ๐ก๐ข๐ญ๐ž๐œ๐ญ๐ฎ๐ซ๐ž & ๐๐ž๐ซ๐Ÿ๐จ๐ซ๐ฆ๐š๐ง๐œ๐ž โœ… Scalable frontend architecture โœ… Component-based UI systems โœ… Frontend performance optimization โœ… Bundle size reduction โœ… Cross-browser compatibility โœ… Responsive web applications โœ… Clean, maintainable, production-ready code โœ… Technical debt reduction ๐€๐๐ˆ ๐ˆ๐ง๐ญ๐ž๐ ๐ซ๐š๐ญ๐ข๐จ๐ง & ๐๐ฎ๐š๐ฅ๐ข๐ญ๐ฒ โœ” REST API integration โœ” Azure API integration โœ” API-driven dashboards โœ” Secure authentication flows โœ” Real-time frontend data handling โœ” Unit testing with Jasmine, Karma, Jest โœ” Cypress testing and regression testing โœ” Code reviews and frontend best practices ๐๐ซ๐จ๐ฃ๐ž๐œ๐ญ๐ฌ ๐ˆ ๐‚๐š๐ง ๐‡๐ž๐ฅ๐ฉ ๐–๐ข๐ญ๐ก โœจ Enterprise Angular applications โœจ React and Next.js web applications โœจ SaaS dashboards and admin panels โœจ Analytics dashboards โœจ Frontend modernization โœจ Angular migration โœจ Frontend performance optimization โœจ Reusable UI component libraries โœจ API-integrated frontend systems โœจ Responsive frontend development โœจ Cross-browser UI fixes โœจ Frontend bug fixing and optimization ๐“๐ž๐œ๐ก ๐’๐ญ๐š๐œ๐ค Angular, React.js, Next.js, TypeScript, JavaScript ES6+, NgRx, Redux, RxJS, Angular Material, Material UI, Tailwind CSS, Bootstrap, SCSS/SASS, HTML5, CSS3, REST APIs, Azure APIs, Cypress, Jest, Jasmine, Karma, Git, GitHub, GitLab, Jira, Confluence, Figma. ๐–๐ก๐ฒ ๐‚๐ฅ๐ข๐ž๐ง๐ญ๐ฌ ๐–๐จ๐ซ๐ค ๐–๐ข๐ญ๐ก ๐Œ๐ž โœ” 10+ years of frontend engineering experience โœ” Strong enterprise application development background โœ” Angular-first expertise with React and Next.js support โœ” Clean, scalable, and maintainable frontend architecture โœ” Performance-focused frontend development โœ” Experience building reusable component libraries โœ” Strong communication with product, design, and backend teams โœ” Reliable delivery in Agile environments โœ” Ability to improve existing frontend systems, not just build new screens If you need a senior frontend engineer who can build, improve, or modernize your Angular, React, or Next.js application, I can help you create a fast, scalable, responsive, and maintainable frontend system built for long-term business growth. Keywords: Angular Developer, React Developer, Next.js Developer, Senior Frontend Engineer, Frontend Developer, TypeScript Developer, JavaScript Developer, Angular Expert, Angular Frontend Developer, React.js Developer, Frontend Engineer, Enterprise Frontend Developer, SaaS Frontend Developer, Dashboard Developer, Admin Panel Developer, Frontend Architect, NgRx Developer, RxJS Developer, Redux Developer, Angular Material Developer, Material UI Developer, Tailwind CSS Developer, REST API Integration, Azure API Integration, Frontend Performance Optimization, Angular Migration, Frontend Modernization, Component Library Development, Responsive Web Application, Micro Frontends, Scalable Frontend Architecture

  • JavaScript
  • React
  • Angular
  • Next.js
  • TypeScript
  • Front-End Development
  • Responsive Design
  • Redux
  • RxJS
  • Angular Material
  • RESTful API
  • Material UI
  • SaaS
  • Web Application
  • Performance Optimization
  • Web Development
  • Tailwind CSS
  • Bootstrap
  • API Integration
  • HTML5
Wajahat M.

Birmingham, United Kingdom

$12/hr
5.0
3 jobs

๐—Ÿ๐—ฒ๐˜โ€™๐˜€ ๐—ฏ๐˜‚๐—ถ๐—น๐—ฑ ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ป๐—ฒ๐˜…๐˜ ๐—ต๐—ถ๐—ด๐—ต-๐—ฝ๐—ฒ๐—ฟ๐—ณ๐—ผ๐—ฟ๐—บ๐—ฎ๐—ป๐—ฐ๐—ฒ ๐˜„๐—ฒ๐—ฏ ๐—ฎ๐—ฝ๐—ฝ๐—น๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—ผ๐—ฟ ๐˜€๐—ฐ๐—ฎ๐—น๐—ฎ๐—ฏ๐—น๐—ฒ ๐—ฝ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ. Iโ€™m available for long-term projects, SaaS platforms, and enterprise-grade solutions. Iโ€™m a Full Stack JavaScript Developer with 5+ years of experience building modern, scalable, and high-performance applications. I help businesses turn ideas into reliable, production-ready digital products. My focus is simple: clean architecture, secure systems, and fast user experiences that support real growth. ๐Ÿ’ป Tech Stack Frontend: React.js โ€ข Next.js โ€ข TypeScript โ€ข Tailwind CSS โ€ข Material UI โ€ข Ant Design โ€ข HTML5 โ€ข CSS3 โ€ข Responsive UI/UX Backend: Node.js โ€ข Express.js โ€ข REST APIs โ€ข GraphQL โ€ข JWT โ€ข OAuth โ€ข Scalable backend architecture Cloud & DevOps: AWS (EC2, S3, Lambda, API Gateway) โ€ข Docker โ€ข Kubernetes โ€ข CI/CD โ€ข GitHub Actions โ€ข Jenkins Databases: MongoDB โ€ข PostgreSQL โ€ข MySQL โ€ข Firebase โ€ข Supabase โ€ข DynamoDB ๐Ÿ”Œ API Integration โ€ข OpenAI API โ€ข Stripe & PayPal โ€ข Google APIs โ€ข Telegram API โ€ข Custom REST APIs & microservices I build secure, scalable integrations with proper authentication and token handling. ๐Ÿ›  Core Expertise โ€ข Scalable API design โ€ข Database architecture & optimization โ€ข Performance tuning โ€ข Secure authentication systems โ€ข Microservices architecture โ€ข API documentation & testing Why work with me? โœ” 5+ years of hands-on experience โœ” Clean, maintainable, production-grade code โœ” Reliable communication & delivery โœ” Proven experience with SaaS, dashboards, and complex platforms ๐Ÿš€ Letโ€™s connect and discuss how I can help build or scale your next product.

  • JavaScript
  • Node.js
  • React
  • ExpressJS
  • AI Development
  • Next.js
  • Tailwind CSS
  • MySQL
  • HTML5
  • SaaS
  • Web Application
  • PostgreSQL
  • Python
  • Stripe
  • Front-End Development
  • Tailwind UI
  • Web Development
  • Python Script
  • NodeJS Framework
  • MongoDB
Usama H.

Cheltenham, United Kingdom

$30/hr
4.6
14 jobs

Iโ€™m a pragmatic full-stack developer with 5+ years of experience specializing in Python (Django, Flask), React, and production REST APIs. I ship reliable, scalable web apps and backend systems with clean PostgreSQL designs and repeatable deployment processes. Iโ€™ve led releases, implemented CI/CD workflows, and designed optimized PostgreSQL schemas for high-read systems. Recent contract work involved debugging large Django codebases, building APIs for dashboards, and delivering frontends for Elixir/Phoenix projects. I prioritize clean architecture, automated tests, and clear communication so you get reliable code and predictable delivery. My approach is API-first, testable, and focused on user experiences and robust functionality. My Full Tech Stack (high level) Frontend: React (hooks, component libraries), JavaScript (ES6+), HTML5, CSS3, Tailwind CSS, Bootstrap, SASS, responsive design. Backend: Python (Django, Flask, FastAPI) Elixir / Phoenix; RESTful API design, JWT/OAuth auth, WebSockets. Node.js, Express.js, PHP, Laravel. GraphQL, microservices, authentication systems Data & infra: PostgreSQL (schema design, indexing, migrations), MySQL, SQL performance tuning, ETL & data extraction scripts, Docker, CI/CD. AWS, Vercel, Render, Heroku RESULTS I DELIVERED As a Django expert, I supported a large production platform (Founders Network) for ~948 hours, resolving critical bugs, shipping system upgrades, and maintaining a 5.0 client rating. As an API & Backend expert, I built and shipped core APIs and backend workflows for apprent.com, taskeen.sa, and dietcity.sa, delivering secure subscription and booking flows, reliable background jobs, and maintainable, well-documented endpoints. As an Elixir / Phoenix & Frontend expert, I delivered UI work ahead of schedule for a Phoenix project. Clients praised my responsiveness and clarity in communication. If you want a partner to take your project from spec to production, audit and stabilize an existing system, or build a fast MVP, Let's Connect! Keywords: Full Stack Developer, Web Developer, MERN Stack Developer, MEAN Stack Developer, JavaScript Developer, React.js Developer, Node.js Developer, Next.js Developer, Angular Developer, Vue.js Developer, PHP Developer, Laravel Developer, Python Developer, Django Developer, API Development, REST API, GraphQL, MongoDB Developer, MySQL Developer, PostgreSQL Developer, AWS Developer, Cloud Developer, Frontend Developer, Backend Developer, Software Engineer, E-commerce Website Development, SaaS Developer

  • JavaScript
  • Node.js
  • React
  • SQL
  • RESTful API
  • Data Extraction
  • PostgreSQL
  • API
  • Flask
  • Elixir
  • Django
  • Python Script
  • Business with 1-9 Employees
  • Business with 10-99 Employees
  • Phoenix

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