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Building The Future of Freelance Software / slashdev.io

Top 5 React Development Companies in 2023/



Michael is a software engineer and startup growth expert with 10+ years of software engineering and machine learning experience.

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Top 5 React Development Companies in 2023
Top 5 React Development Companies in 2023


Slashdev.io is a dynamic software company with a global presence that has been making waves in the tech industry since its inception. Founded in 2021, this innovative firm has centered its mission around digital transformation and software development. With a dedicated team of expert developers and a commitment to staying at the forefront of technology trends, Slashdev.io has become a go-to partner for businesses seeking to enhance their digital capabilities. Their proficiency spans a wide range of programming languages and technologies, but they truly shine in JavaScript and TypeScript. With a proven track record and a passion for pushing boundaries, Slashdev.io continues to be a driving force in the software development industry. Clutch listed slashdev.io as the “Top Software Developer 2023”.

SERVICES: freelance development & recruiting, custom software development, DevOps engineering, full-stack development, frontend development, backend development, app development, FinTech development, machine learning, blockchain development, data science, agency recruitment, GPT development, cloud development, AWS development, azure development, GCP development

TECH STACK: JavaScript, TypeScript, Node.js, React.js, React Native, NestJS, Golang, Electron.js, GraphQL, Kubernetes, AWS, Azure, GCP

TEAM: react developers, NodeJS developers, flutter developers, react native developers, iOS developers, android developers, laravel developers, PHP developers, DevOps engineers

SKILLS: DevOps, NextJS, C#, .NET, Python, Django, C++, C, Rust, TypeScript, Backend, JavaScript, Swift, AWS, Blockchain, Azure, Unity, Unreal, iOS & Android

REVIEWS: 5.0 stars on Clutch.

WHAT CLIENTS APPRECIATE: technical knowledge, professionalism, recruitment, quick processing, enthusiasm, multi-channel communication, project collaboration, cost-effective solutions, affordable pricing, commitment to the project, proactive and futuristic approach,

CULTURE & VALUES: They place a significant emphasis on the concept of ownership and fostering robust collaborations with both clients and team members. They encourage proactive actions and prioritize engagement. The company holds in high regard a comprehensive approach to product development, which involves consistently viewing products from a business standpoint. They firmly believe in the value of addressing challenges collectively through effective communication. The team places great importance on continual growth, sharing knowledge, and working together harmoniously.


LOCATION: United States, UK & Sweden


Brainhub is a software development agency from Poland, founded in 2015. The company focuses on digital acceleration and team augmentation, offering cross-functional teams supported by Business Analysts. Their core technologies are JavaScript and TypeScript. Brainhub was distinguished among FT 1000 Europe’s Fastest-Growing Companies and received Rising Star Awards from Deloitte: 50 Technology Fast Central Europe. Clutch listed Brainhub among the Top 100 Sustained Growth Companies.

SERVICES: web development, mobile development, desktop development, UX/UI design, DevOps & Agile consulting, digital product development, staff augmentation, digital transformation

TECH STACK: JavaScript, TypeScript, Node.js, React.js, React Native, NestJS, Golang, Electron.js, GraphQL, Kubernetes, AWS, Azure, GCP

TEAM: software engineers, QA engineers, UX/UI designers, business analysts, tech advisors, scrum masters, agile coaches, solution architects, DevOps engineers, delivery managers

SKILLS: DevOps, workshops, hybrid mobile app development, iOS app development, Android app development, PWAs, UX design, UI design, UX audit, UX workshops, architecture development, MVP, prototyping, product scaling, CI/CD, automated tests, BDD, TDD, information architecture, visual design, backend engineering, API development, serverless architecture, testing

REVIEWS: 4.9 stars on Clutch.

WHAT CLIENTS APPRECIATE: technical knowledge, quality of the code, proactive attitude, project management abilities, transparency, engagement, dedication, curiosity, being quick to implement feedback, being a part of a client’s team, flexibility, commitment, being friendly and highly collaborative

CULTURE & VALUES: They highly believe in ownership and building solid partnerships with clients and between team members. They support proactive behavior. The company values engagement and a holistic approach to product development, which implies always looking at a product from a business perspective. They believe in the importance of solving problems together through excellent communication. Consistent growth, knowledge-sharing, and cooperation are very important to the team.





Visualty is a software development company from Poland, founded in 2007. They specialize in HRTech, SportsTech, and booking systems. They support the growth of ongoing projects and build products from scratch. They were listed among the Top B2B companies in 2020 by Clutch.

SERVICES: audit/workshops, web development, mobile app development, UX/UI design, IT consulting

TECH STACK: Ruby on Rails, React, Go, AWS, Redux

TEAM: software engineers, frontend developers, backend developers, product designers, project managers

SKILLS: PWA, UX design, UI design, MVP, code audit, business consulting, wireframing, prototyping, branding, project management, workshops, single page application, redesign, brand identity

REVIEWS: 5.0 stars on Clutch.

WHAT CLIENTS APPRECIATE: technical background, set of skills, top level communication, great project management, meeting deadlines, understanding of the business side of the project, creativity, competence, accountability, being personable and professional, a great culture of work, precise and high-quality code, skilled and innovative team

CULTURE & VALUES: They highly value individuality, which combines into great teamwork. They love seeking knowledge and sharing it with others, and always strive to be positive and learn from mistakes. Team members are helpful to one another, and cherish responsibility and transparency. They consider looking for the simplest solutions important and perceive discussions as the way to come up with the greatest ideas.


LOCATION: Poland (Warsaw)


Thoughtbot is a creative design and development studio founded in 2003 in the US. They pride themselves on offering not only product development but also teaching teams the best practices.

SERVICES: UX/UI design, product design, web development, mobile development

TECH STACK: Ruby on Rails, Python, Django, React, React Native, AWS

TEAM: developers, product designers,  QA engineers, product managers

SKILLS: design research, product design sprints, DevOps, usability audit, discovery sprint, visual design, frontend design, mobile design, web design, IoT, Android development, iOS development, hybrid apps, design research, design sprint, UX design, MVP, UI design, usability audit

REVIEWS: 4.9 stars on Clutch.

WHAT CLIENTS APPRECIATE: well-balanced processes, solid control over the project, flexibility, on-point schedules, and budget management, addressing everything immediately, being attentive, commitment to the project and the client’s success, collaborative partnership, dedication, responsiveness, high engagement

CULTURE & VALUES: They believe in growth and constantly improving. Their mission is to support and guide. One of their values is trust, as they give one another the benefit of the doubt, provide constructive help, and encourage transparency. They always go forward and improve themselves, the company, and the community. They also cherish the quality – also of the processes, which they help clients with. They also believe in self-management and seeking fulfillment in everything they do.




Geniusee is a software development company from Ukraine, founded in 2017. They mainly focus on EdTech and FinTech products, working with small and mid-size companies, and startups. They pride themselves on having over 100 projects delivered and being experts in 64 technologies. They were listed among the Top developers from Ukraine in 2021 by Clutch and named Top Android app developers by Goodfirms.

SERVICES: mobile development, web development, UX/UI design, website support, DevOps support

TECH STACK: React.js, Vue.js, Node.js, Python, .NET, Java, PHP, React Native, Swift, Kotlin

TEAM: software engineers, frontend developers, backend developers, project managers, business analysts, UX/UI designers, DevOps engineers, QA engineers

SKILLS: DevOps, AWS, business analysis, QA testing, QC testing, POC, MVP, blockchain, serverless architecture, Data Science, Artificial Intelligence, Machine Learning, DevOps engineering, discovery phase, product maintenance, legacy reengineering

REVIEWS: 5.0 stars on Clutch.

WHAT CLIENTS APPRECIATE: understanding clients’ needs, being supportive, seamless collaboration, understanding the requirements clearly, constant communication, determination to get things right, good prioritizing, efficiency, transparency, high-level involvement, being accessible, disciplined and skilled

CULTURE & VALUES: The company treasures trust and transparency in relations with clients and between team members. A partnership is one of their core values – they are very dedicated to their partners because that symbolizes win-win results to them. The team is responsible, believing in the worth of providing support and commitment to deliver on time.


LOCATION: Ukraine (Kyiv, HQ)