15 Best Web and Mobile App Development Companies in Europe (2026)

Gilzor is a software development company working on custom web and mobile products for startups, growing businesses, and established product teams. Its services cover the full development cycle, including business analysis, UI/UX design, engineering, QA, launch, and ongoing maintenance. For web projects, the company works with technologies such as React, Next.js, Node.js, and Python, while its mobile stack includes Swift, Kotlin, React Native, and related native technologies. Gilzor has European offices in Warsaw and Limassol and works across sectors including fintech, healthcare, education, and e-commerce.

Netguru is a Polish digital product company providing custom web and mobile development alongside product design, cloud engineering, AI, and software modernization. Its web teams work with technologies such as React, Next.js, Node.js, Python, Ruby on Rails, Angular, and Vue, while mobile development includes Swift, Kotlin, Flutter, React Native, and Kotlin Multiplatform. The company has delivered products across digital commerce, marketplaces, fintech, healthcare, and enterprise environments. Based in Poznań, Netguru works with businesses that need both customer-facing applications and the engineering infrastructure behind them.

A-listware provides web and mobile development as part of a wider software engineering and IT outsourcing practice. The company works on custom applications, web platforms, mobile products, modernization projects, UI/UX, QA, cybersecurity, and infrastructure. Its technology stack covers .NET, Java, Python, PHP, Node.js, React, Angular, and Vue for web development, alongside Swift, Flutter, React Native, Xamarin, Android, and iOS technologies for mobile projects. A-listware is particularly suited to businesses that need an external development team or additional specialists integrated into an existing engineering operation.

Itexus is a software development company with a strong focus on fintech and financial services products. It develops web and mobile applications for digital banking, payments, lending, trading, brokerage, wealth management, insurance, and digital assets. Its web stack includes React, Angular, Java, .NET, TypeScript, and Python, while mobile development uses Flutter, React Native, Swift, and Kotlin. The company maintains development operations in Europe and is particularly relevant to financial organizations that need app development combined with integrations, compliance-focused engineering, QA, and long-term product support.

STX Next is a European software engineering company delivering web and mobile applications alongside AI, data engineering, cloud, and product design services. Its development work is suited to products that depend on complex back-end systems, analytics, machine learning, or cloud infrastructure rather than simple standalone applications. The company has around 500 professionals and more than two decades of software development experience. With offices in Poznań, London, and Eschborn, STX Next works with businesses that need web and mobile interfaces connected to larger technical ecosystems.

Brainhub is a Polish software development company focused on web, mobile, and desktop applications for businesses with technically demanding products. Since 2015, the company has worked with more than 80 companies across over 20 industries. Its web and mobile teams use technologies such as React, React Native, Node.js, .NET, TypeScript, and cloud platforms, with services extending into product design, software modernization, DevOps, AI, and staff augmentation. Brainhub has published projects combining web and mobile development in fintech, mobility, e-commerce, and other product-led sectors.

21Century.Tech is an AI-native software development studio focused on building and shipping production software with senior engineering oversight. Its work covers MVP development, full-stack features, landing pages, integrations, legacy refactoring, testing, documentation, and deployment. The company uses AI-assisted engineering throughout development while keeping architecture, business logic, security decisions, code review, and final quality under human control. Its model is particularly suited to businesses that want to move from product specifications or designs to working software quickly, including projects where web interfaces, back-end functionality, and third-party integrations need to be developed together.

OSKI Solutions is an Estonia-based software company working across web, mobile, desktop, cloud, and custom application development. Its web capabilities include front-end and back-end development, business portals, responsive applications, and e-commerce systems, while mobile services cover native and cross-platform development for iOS and Android. The company's technology stack includes React, Vue, Nuxt, Angular, Next.js, .NET, Node.js, Python, and PHP. OSKI is particularly relevant to projects where mobile and web applications need to connect with cloud infrastructure, external systems, or existing enterprise software.

Droids On Roids is a Polish product development company with a particularly strong focus on mobile applications. Its services cover native iOS and Android development, Flutter, Kotlin Multiplatform, web applications, product design, discovery, and IoT software. The company has worked on products in fintech, medtech, retail, connected devices, and other technology-driven sectors. Based in Wrocław, Droids On Roids is a good match for businesses where the mobile app is the central product but supporting web interfaces, product design, back-end systems, or connected-device functionality are also required.

Mobian is an Estonian development company with a strong emphasis on custom mobile applications and supporting digital systems. Its project experience covers sectors such as fintech, healthcare, logistics, telecommunications, and enterprise software, while its wider technical capabilities include web development, back-end engineering, AI, and team augmentation. The company works with technologies including React, Node.js, Python, and Flutter and supports both complete product delivery and the addition of individual specialists to existing teams. Its Tallinn base makes it a European option for businesses where mobile development is the main priority.

Net Devs is a Warsaw-based software engineering company focused on enterprise development, modern front-end applications, AI engineering, and cloud platforms. Its engineering stack covers .NET, JVM technologies, Node.js, Python, Go, React, Angular, Vue, and TypeScript, while its team also includes dedicated mobile engineering expertise. Projects move through discovery, prototyping, development, QA, deployment, and continued iteration, allowing the company to work on complete digital products rather than isolated coding tasks. Net Devs is particularly suited to businesses that need senior-led engineering for complex applications, modern user interfaces, cloud infrastructure, and integrations.

SoftPro is a Warsaw-based software development company working on web applications, mobile products, cloud systems, and custom enterprise software. Its technology stack has a strong Microsoft component, including .NET, C#, and Azure, alongside React, Node.js, AWS, and other web technologies. The company also provides UI/UX design and product discovery, allowing development to start before technical implementation. SoftPro is particularly suitable for businesses that need web and mobile applications integrated with Microsoft environments, cloud infrastructure, or larger internal software systems.

The Software House is a Polish development company that provides dedicated product teams, web development, mobile engineering, and product design. Its engagement model is particularly useful for technology companies that already have an internal product or engineering organization but need additional specialists or an external team to accelerate delivery. The company works on custom digital products rather than limiting its services to websites or isolated applications. With offices in Gliwice and Warsaw, it serves businesses looking for ongoing engineering capacity as well as end-to-end product development.

Miquido is a Kraków-based software development company working across mobile applications, web products, AI, product design, and enterprise software. Its mobile practice covers native iOS and Android development alongside Flutter and React Native, while its web capabilities include front-end, back-end, and custom application development. The company has delivered more than 250 digital products and has a team of over 200 specialists. Published projects span fintech, entertainment, e-commerce, insurance, and other industries, including work for companies such as Dolby, Warner Recorded Music, TUI, and Aviva.

EL Passion is a Polish digital product company providing web development, mobile engineering, product design, AI development, and DevOps services. Its teams build full-stack web products alongside native iOS, native Android, and cross-platform mobile applications. Published project experience includes healthcare, HR technology, media, enterprise software, and consumer-facing products. Based in Warsaw, the company is suited to teams that want product design, application engineering, and technical delivery coordinated by one provider rather than divided between separate design and development agencies.