Check the complete list of top React.Js Development Companies and Developers here:
1. Konstant Infosolutions: 
https://www.konstantinfo.com
Konstant Infosolutions is a premier software development company, offering a wide range of web and mobile solutions across the globe since 2003. The company has a team of 180+ highly qualified and experienced IT professionals who can deliver best of technology solutions and consulting services across diverse business needs.
Services Provided by Konstant Infosolutions:
As a leading software development company, Konstant provides reliable web and mobile solutions spanning across Native Mobile Apps Development, Cross-Platform Mobile App Development, Custom Web Development, UI/UX Design Solutions, Artificial Intelligence, AR/VR Development, E-Commerce Solutions, Database Programming, CMS Development, Enterprise Mobility Solutions, Cloud Consulting and IT Consulting – offering businesses delightfully tailored and trendy solutions in their budget.
Key Clients: United Nations, Wonder Cement, Volkswagen, Stanley, Citrix, Project Action Star, RawBank, Houghton Mifflin Harcourt, ThomasVille, Scholastic, Nestle, NASSCOM, TABCO.Food and more.
Client’s Review:
“The team provided excellent communication and updates in a timely manner. Deliveries were on time and prompt with their responses.Their cost-effectiveness, timely deliveries, and communications were impressive.” – Yong Kim
2. eSparkBiz:
https://www.esparkinfo.com
eSparkBiz’s 10 years of experience in tech trends allow it to deliver remarkable software solutions that boost business efficiency and fulfills customer satisfaction. Our developers have expertise in providing IT consulting service for startups and enterprises.
Services Provided by esparkbiz:
Custom Software We Develop: Web Applications, Mobile apps, SaaS products, Desktop applications, Libraries
Key Clients: Samata Health, Mynd Matters
3. GeekyAnts:
https://www.geekyants.com
GeekyAnts is a product studio specializing in web and mobile development using React, React Native, Flutter, Vue, Angular, NodeJS, Laravel, Python etc.
GeekyAnts is the brains behind React Native’s most famous UI library NativeBase (13000+ GitHub Stars), BuilderX (a design tool that can write the code for you), Vue Native, NativeBase Market and much more. They are registered service suppliers for Google LLC since 2017.
On the services side, they have worked with around 500+ clients all across the globe. They have been a steady tech partner to world’s top corporate giants to small & mid-sized startups helping them to modernize and evolve their businesses.
Services Provided by GeekyAnts:
Mobile App Development, Web App Development, Web designing, UI/UX Design
Key Clients: Google, Siveco Romania, ChildMind Institute, Tellius, Paypoint, Quintype, Endlink, Mobile Premier League
4. BairesDev:
https://www.bairesdev.com
We are the fastest growing Technology Solutions company in Latin America, with offices across the main cities in LATAM and the US. We have the largest applicants pool in the industry with over 145.000 Software Engineers applying to work with us each year, from which we hire only the Top 1% most talented through a rigorous staffing method. This is how we create solid teams of 100% bilingual veteran developers.
We work providing end-to-end delivery for companies of all sizes, from startups to some of the biggest companies in the world, leading projects for Google, Sirius XM, Volkswagen, Groupon, IBM & Viacom, among others. The heart of our work is Software Outsourcing, Testing and Operational Support which we provide through a service of fully managed teams that integrate seamlessly into your projects. We are a group led and guided by an Agile mentality. We are a firm founded and run by Developers. We are a company Powered by Technology and Driven by Talent.
Services Provided by BairesDev:
Software Outsourcing, Staff Augmentation, UI/UX Design, Mobile, Quality Engineering, Software Support, Big Data, Gaming, MVP Development Services, Cloud Computing
Key Clients: SiriusXM, Google, Viacom, Groupon, Netgear, Univision, AP, Turner, IBM, Thomson Reuters, RightSide, Salesforce, Whirlpool, HP, BBVA, AdRoll, R/GA, Instructure, Leaf Group, iSeatz, EPublishing, BlackBoard, Roemmers, MuleSoft, Fresenius, Square, Kapsch, Gemalto, IPG Mediabrands
5. Merixstudio:
https://www.merixstudio.com
We are a full-stack team of 120+ experts who build complex digital products for clients worldwide looking to outsource software development to professionals.
Merixstudio’s key expertise is the delivery of high-quality and performant web applications and cross-platform mobile apps. Based on the needs of our clients, we can support them in end-to-end product development or seamlessly extend their in-house team of engineers.
Our clients recognize us as a one-stop software development company with the ability to create a long-term design and development partnership. In return, we give them the best quality that stems from working with top-tier talents. We seek, recruit and develop the brightest engineers and designers locally creating an outstanding workplace for them. Check it out for yourself!
Services Provided by Merixstudio:
Merixstudio’s key expertise is the delivery of high-quality and performant web applications and cross-platform mobile apps. Based on the needs of our clients, we can support them in end-to-end product development or seamlessly extend their in-house team of engineers.
Key Clients: The Juilliard School, Toshiba, GS1, SendinBlue, RingCentral, FOX, Deutsche Post, HSBC, DFJ, Ferratum, Marks & Spencer, SFR, Orange, Credijusto, Volkswagen, The Independent, Tesco, Payback, Moneyfarm, Bronson Laboratories, Herald.ie, Virgin Digital Help, 123rf (part of Inmagine Group), Billabong, Divio, bookingkit, and more.
6. XB Software:
https://xbsoftware.com
XB Software is a reliable full-cycle custom web development company focused on the needs of its customers. We provide web and mobile app development, software testing and staff augmentation services. XB Software is ISO27001 and ISO9001 certified company. Our expertise is proven by over 150 successfully completed projects throughout the globe and a lot of satisfied clients in USA, Canada, UK and EU countries. We also develop own successful web products and therefore can share this valuable experience with our clients. Our technology expertise includes React.js, Marionette.js, Webix, Node.js, PHP/Laravel, .NET, etc. We develop rich web and mobile apps using Yii framework, Webix, and other popular frameworks and libraries. XB Software excels in web and mobile app development, app modernization, IT staff augmentation, ERP development, web design.
Services Provided By XB Software:
Web & Mobile App Development, Software Testing, QA and IT Staff Augmentation
Key Clients:
7. Uplers:
https://www.uplers.com
Uplers is a one-stop digital services company delivering end-to-end web, design, digital marketing, and email production services to businesses and agencies across 52+ Nations. Backed by a team of 500+ digital experts, the company is the preferred hub to hire dedicated developers, marketers, designers and dedicated teams.
Services Provided by Uplers:
Hubspot web development, WordPress web development, SEO, SEM, Email Marketing, Design
Key Clients: Amazon basic, National Geographic, JXT, Airtasker, Weight watchers reimagined and many more
8. Altoros:
https://www.altoroslabs.com
Altoros is a professional software services provider that specializes in delivering fully managed solutions based on Microsoft .NET, Java, Ruby on Rails, Angular, React, JavaScript, Android, iOS, Hadoop, and NoSQL. Altoros also helps companies to build a sustainable competitive advantage on top of Cloud Foundry, blockchain, and artificial intelligence technologies
Services Provided by Altoros:
Our services range from assistance with selecting the most optimal technology stack and training, to developing complex enterprise-grade solutions, to integration and migration of legacy systems.
Altoros provides methodology, training, technology building blocks, and deep industry knowledge in telecom, logistics and transportation, healthcare, retail, e-commerce, and energy.
Main areas of expertise: Custom software development, UI/UX design, Cloud Foundry implementation (microservices, containers, PaaS), Integration and legacy systems modernization, Artificial intelligence and machine learning, Predictive analytics, Blockchain solutions for startups and enterprises
Key Clients: Siemens, Sony, Denso, Toyota, Hitachi, Couchbase, Allstate
9. Inoxoft:
https://inoxoft.com
Inoxoft – an international software development company that delivers custom solutions for small and large businesses. The company conducts clear estimation of requirements and offer several cooperation models according to timescope, budget and complexity of desired features to be included in the solution. Inoxoft shares the principles to develop and improve business environments through digitalization and strong expertise in the domain.
Services Provided by Inoxoft:
Mobile, Web, Cloud Development, UI/UX Design, QA services, and the Discovery Phase.
Key Clients: Synergy, Dimex, Chirpi, Si Time, Lumen, BeyondVerbal, Pinguin, UC San Diego, Yumble, R&L Consulting
10. Bacancy:
https://www.bacancytechnology.com
We have a team of 20+ RPA developers with a minimum 4 to 6+ years of experience in building RPA solutions and well-versed in using innovative tools and practices that empower your businesses to transform manual processes into automated digital processes. Our clients have been from startups, SMEs, large-scale enterprises, and fortune 500 clients worldwide since 2011.
Services Provided by Bacancy:
Bacancy is the most preferred RPA Development and software development company being a prominent choice for outsourcing programmers in emerging technologies like Ruby on Rails, ReactJS, Vue.js, AngularJS, Laravel, Flutter, React Native, and CRM services like Salesforce and Microsoft 365.
Key Clients: Mercedes-Benz, Red Bull, Warner Brothers, Verizon, Bangkok bank
More Industry Leaders:
11. S-PRO:
https://s-pro.io/en
S-PRO provides end-to-end development solutions: from analytics and consulting to delivery and launch. We act as a technical partner for enterprises and startups and take the responsibility for the product development.
Key S-PRO facts: 5-years end-to-end development experience; 150+ full-time in-house professionals; Customers in 27 countries worldwide; 90+ IT solutions shipped and counting.
Every year our team members acquire new expertise in the latest technologies. This advantage allows us to be one step ahead. Always.
Services Provided by S-Pro:
Artificial intelligence, Cross-platform mobile and web app development, Blockchain implementation, UI/UX design and branding, Big Data
Key Clients: MeterQubes, Hubspring, TSO Chinese Delivery, Climate Drops, PolarPro
12. SumatoSoft:
https://sumatosoft.com
One of the most reliable partners with extensive experience, technical expertise and worldwide recognition, SumatoSofthas developed software solutions for brands like Toyota, CornerStone, OnDemand, Nectarian, Boxforward and many more. They work with the most advanced technologies including chat bots, AngularJS, Magento 2.
Services provided by SumatoSoft:
The core services include business analysis, app design, programming, testing and QA, mobile app development, software development, data management, eCommerce development, API integration, Content Management Systems, Messaging-as-platform-applications.
Key Clients:
13. DigiFutura:
https://www.digifutura.com
DigiFutura is design driven application development company focused to create compelling user experience design digital experiences and building topnotch highly scalable web and mobile applications for enterprises, startups and SME’s. DigiFutura is specialized in helping clients with their data strategy, automating their mundane tasks by utilizing AI/ML methods and most importantly creating delightful user experiences based on data. DigiFutura has been awarded as one of the Top 10 Best Startup in Mobile Application Development Companies in 2016 by Startup City Magazine.
Services Provided by DigiFutura:
UI/UX Design, Mobile App Development, Web Development, AI/ML Solutions, Block-chain
Tech Skills: Ruby on Rails, React Native and ReactJS, NodeJS, Vue.js, AngularJS, Python, Swift, IBM Watson, Microsoft Cognitive Services, Google AI.
Key Clients: Zoomcar, Bridge2Solutions, QNAPP, Acube Now, BlueJeans, Luxie.inc, HP, ElevenPlusExams
14. MLSDev:
https://mlsdev.com
MLSDev is an award-winning custom software development company that builds web and mobile apps for SMBs, big brands, and ambitious entrepreneurs with awesome ideas. Established in 2009 | 100+ clients, 200+ projects | 34 awards | 97% client satisfaction rate.
If you need a technical partner that will not just deliver the code but challenge you back, add some extra value to your project, and support your business’ growth – choose MLSDev. Be sure, with MLSDev, that your new app will bring you more profit quickly.
Services Provided by MLSDev:
Web Application Development, Mobile App Development, Custom Software Development, Dedicated Development Teams, IT Staff Augmentation
Key Clients: ESPN, McDonald’s, GoPuff, Danone, Panasonic, Alpine, Comfy, ArtStation, LevelUp, Chored, Yummi, and EdgeRift.
15. Cleveroad:
https://www.cleveroad.com
Cleveroad team is your reliable partner in software design and development. Starting with an idea, through requirements analysis to UI/UX design creation and development, we work hard to drive value into every project we undertake. Having delivered over 130 software solutions, we gained vast expertise in iOS, Android and Web apps development. We believe that creative thinking and collaborative approach to every step of development process delivers top-notch products.
Services Provided by Cleveroad:
Cleveroad provides full stack development services – mobile, web, desktop apps development, user-first UI/UX design, responsive web design, and development, backend integration, outstaff services.
Key Clients: DPD, HSBS, BET3000, Virgin Atlantic, PrankDial, MoneyWiz, Fuji HI, Octopus, Cartogram, Blockbuster
16. Hidden Brains InfoTech:
http://www.hiddenbrains.com
Hidden Brains InfoTech is a globally acclaimed CMMI Level-3 custom software development and IT consulting firm that specializes in enabling digital transformation. Our company was founded in 2003 and has since achieved unprecedented growth, serving over 2400 clients in 107 countries. We have earned the distinction of being a ‘Great Place to Work® Certified\’ organization, which highlights our commitment to maintaining an exceptional work culture and transparent business practices.
Services Provided by Hidden Brains InfoTech:
Hire Dedicated Developers, Web Application Development, Mobile Application Development, UX/UI Design Services, Front End Development, Product Prototyping, Microsoft Development, Cloud and DevOps
Key Clients: DHL, Caterpillar Inc, GT Bank, PlantVillage, Scosche Industries, ELMO Spa, Plus, DeliveryAny, HomeHub, Custom Wrkshop, VaRepo, Zoebook
17. Ready4S:
http://ready4s.com
Ready4S is a full-time mobile app development firm that is managed from Poland and is a highly recommended mobile app developer in the United States. They form a great company that supports quality IT outsourcing across the globe. A small team of developers, business analysts and quality analysts is proficient to inspire startups and entrepreneurs in setting up an imperial brand among global audiences through high-tech, influential apps.
Services provided by Ready4S:
The company offers free app development consultancy to all types of businesses and productive business solutions.
Key Clients:
18. Xicom Technologies:
http://www.xicom.biz
Xicom was founded in 2002 and now it is a leading software and mobile app development company in the world. It is expert in developing Android and iOS apps and it also provides software development services in Java, .NET, Website development, Ecommerce development and developing applications based on IoT, AI, Blockchain and Cloud technology. Xicom is a preferred Android and iOS development company and it also offers cross platform app development services for various frameworks including React Native, Xamarin, PhoneGap / Cordova, Titanium Appcelerator, Ionic and Sencha.
Services provided by Xicom Technologies:
Xicom provides wide breadth of software development, mobile app development, web development and IT consulting services across the entire IT spectrum. Xicom is expert in Web development (PHP, ASP.NET, Ecommerce Solutions, Open Source, Website Design and Development), Mobile App Development (Android, iOS and Cross platform app development), Software Development (Java, .NET, Enterprise Applications) and IT Consulting (Cloud solutions, Managed IT solutions, Product Engineering Solutions)
Key Clients: Spooner, Lunchserved, Campcrate, Ecopons, Snapsellers, Fitfix, Notch, Whaabaam, Algotrader, Gosupps and more.
19. Sparx IT Solutions:
http://www.sparxitsolutions.com
Established in 2008, Sparx IT Solutions specializes in tailor-made, professional, effective and affordable web solutions. With the aim of achieving 100% customer satisfaction, the team at Sparx makes sure that their clients own a website exactly what they were looking for. They have worked for brands like Yamaha, Coca-Cola, Unilever, BMW, Yamaha, GSK, Revlon, Amdocs and many others. It is a NASSCOM certified PHP development company that has completed more than 13,200 projects for more than 9,100 clients worldwide.
Services provided by Sparx IT Solutions:
The major services offered by Sparx IT Solutions include design and markup, web development, eCommerce web development, business analytics, apps and game development and internet marketing.
20. TechMagic:
http://www.techmagic.co
TechMagic is a development company from Ukraine. Being startup founders ourselves, they help entrepreneurs to launch their great ideas. TechMagic execute Lean Startup Methodology and believe in Minimal Viable Product development to see if a concept works. They use Agile to make quick iterations and build solutions that really fit the market.
Services provided by TechMagic:
TechMagic has experienced in native iOS and Android application development with complex Back-End (Node.js). Also, they provide dedicated team model, so clients can build thier own team in Ukraine.
Looking for the best React.js development companies for building successful web applications for your business? ITFirms lists top Reactjs Development Companies and Developers that are experts with years of experience, 100% confidentiality on Non-disclosure agreements, and dedicated team of developers for every project and provide quality work at commendable cost. These firms are experts in developing user-interfaces with React.JS. These are the ones that have provided quality work and are reliable. They are in the process of building cohesive technology solutions on the next-generation web and mobile platforms. Their deep understanding of diverse business environments has helped businesses (clients) develop applications that deliver tangible business value. A collaborative approach, strong communication, flexible and professional working style and high-quality are some of the major qualities that position them as pioneers in the Reactjs App Development Scenario.