Mobile Development
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Custom Mobile App Development

We provide everything a digital product needs to thrive both on Android and iOS, ensuring the performance and user experience of the native app.

fully functional apps

Reach a broader audience and get a competitive advantage in the market

With seamless, user-friendly native app experiences across all modern platforms and devices.

We deliver cross-platform mobile apps based on the leading cross-platform development solution that truly transforms businesses and gives success stories. Our mobile development teams design and build mobile digital products withstanding the challenges of today's fast-paced market.

Reach a broader audience and **get a competitive advantage in the market**

We helped our client Brezaway reach their goal!

Our client Brezaway powered 6M+ guest messages and facilitated 12M+ property care tasks since the launch of the mobile app.

Looking for a way to accelerate your mobile app development while reducing costs and increasing your reach to customers? With years of expertise in React Native, we build apps that look and feel like native apps, with smooth animations, fast performance, and a native user interface.

Speed up time-to-market

React Native enables you to build mobile apps for both iOS and Android platforms with a single codebase, saving you valuable time and resources. This means you can get your app to market faster and stay ahead of the competition.

Maximize your ROI

With React Native, you can reduce development costs by up to 50% compared to traditional native app development, without sacrificing quality or performance. This means you can maximize your return on investment and see a higher profit margin.

Enhance user experience

React Native enables you to build cross-platform apps that look and feel like native apps, with smooth animations, fast performance, and a native user interface. This means you can enhance the user experience and build strong customer loyalty.

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Mobile apps published
Years of experience
Users of our apps

Client Value & Trust

Learn how entrepreneurs, business and technology leaders who are after software driven innovation are collaborating with our high-performing teams.

Nate Oaks
Nate Oaks
CTO & Co-Founder, Breezeway USA

The team at Selleo has been positively received internally. Their dedication to the success of the company is noteworthy. They’re skilled and responsive. Customers can anticipate a real partnership while working with them.

Leverage our **domain expertise** and **technical knowledge** to build a one-of-a-kind custom solution
Trust our experience

Leverage our domain expertise and technical knowledge to build a one-of-a-kind custom solution

Schedule a consultation

How we start collaboration


Signing the

Firstly we sign the non-disclosure agreement to protect your confidential business information.


Call with a Technical Team Lead and a BA

the next step is to schedule a meeting, that will help us with getting a better understanding of your business idea and gathering all the details allowing us to prepare the cost estimation.


Interviews with the whole Team

this is the opportunity for you to get familiar with members of the team that will deliver your product, so there are no unnecessary surprises.



when everything is settled, the team is ready to smoothly start working on the agreed date.


Our experience, your success

We take pride in our commitment to quality and excellence and our high Clutch rating is a reflection of that. We always strive to exceed expectations and deliver exceptional results to every client we serve.

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our team

Hire experienced software development team today!

Product Owners and CTOs in start-ups and SMEs craft their SaaS products or build their own cloud-based solutions with our teams.

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Our Expertise

How we helped clients grow their businesses

A Swedish EdTech company making teaching more accessible with a portal connecting schools with experienced teachers

The Selleo team took charge of the entire full stack and mobile app development while maintaining the infrastructure that supports it. Team members actively participated in brainstorming sessions to help the client understand better what had to be done.View project
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Mobile app development can provide numerous benefits, including increased customer engagement, improved brand recognition, access to new revenue streams, and enhanced user experience. Especially partnering with a reputable mobile app development company enables businesses to create customized apps tailored to their specific needs and target audience. This enhances brand visibility and customer engagement leading to increased sales and revenue.
Native mobile app development involves creating apps specifically for a particular platform, such as Android or iOS, using platform-specific programming languages and tools. Hybrid mobile app development involves using web technologies such as HTML, CSS, and JavaScript to create apps that can run on multiple platforms.
The time it takes to develop a mobile app depends on various factors, including the complexity of the app, the platform, the features, and the development approach. Generally, it can take anywhere from several weeks to several months. It is crucial to establish clear project requirements, conduct thorough planning and maintain effective communication with the mobile application developers to ensure a smooth and timely development app process.
Mobile app development is crucial for your business as it enables you to reach and engage with a vast audience that relies heavily on mobile devices. Whit the ever-increasing popularity of smartphones, businesses need to adapt and tap into this growing market. Mobile application development allows you to create personalized and convenient experiences for your customers enhancing their satisfaction and loyalty. Building mobile apps also provides a competitive advantage, as it showcases your commitment to innovation and customer-centricity. Furthermore, mobile apps created for your business can streamline operations, improve efficiency and facilitate streamless communication with your target audience.

Cross-platform app development refers to the process of creating mobile applications that can run on multiple operating systems such as iOS and Android, using a single codebase. By leveraging cross-platform development frameworks like React Native, developers can write code once and deploy it across multiple platforms. This approach allows businesses to reach a wider audience as their app can be accessed by users of different devices and operating systems.

Cross-platform development also helps reduce development costs since there is no need to build separate applications for each platform.

The cost of developing a custom mobile app can vary based on various factors such as the complexity of the app, the features required and the development approach. For cross-platform development, where the app is built to run on multiple platforms including iOS and Android the cost is typically higher compared to developing separate native iOS and Android apps. Hybrid apps development which combines web technologies with native code, can be a cost-effective option, but it may not offer the same level of performance and user experience as native apps.
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Awards & Certificates

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  • Top 1000 Companies Global 2021
  • Top Development Company Poland 2021
HR dream team
  • 2020 HR Dream Team Award
  • 2016 Employer Branding Featured
  • 2015 HR Dream Team Award
ISO CertificateISO Certificate
  • Information Security Management System compliant with PN-EN ISO/IEC 27001
  • Business Continuity Management compliant with ISO 22301