Stefan Majiros - Mobile App Development Company in Barcelona, Bratislava

Progressive 100% custom mobile apps that help businesses grow and save money. From Barcelona & Bratislava.

👋 At we provide IT consulting and build complex mobile projects for big enterprises and startups that require React Native and serverless cloud expertise.

Stefan Majiros | Projects Example

As a mobile app development company, we use React Native and serverless (AWS, Firebase) to deliver 100% custom-made app for client's startup or enterprise

up to 90% maintenance cost savings

With serverless cloud, provisioning and maintenance are taken care of by the cloud provider (AWS). Customers only pay for the compute time they actually use, and resources are scaled as needed.

up to 50% development time savings

By using React Native, we share code between iOS and Android apps which makes development more effective in terms of costs and price than if we would develop two, completely separate native apps.

100% app development cost guaranteed

Because proper estimation is our job, you will know before the project start what will be the delivery cost and you will not pay a cent more. Also, any bugs will be fixed at no additional costs by 3 months guarantee.

up to 100% remote mobile app development

You can meet our founder in Barcelona (ES) & Bratislava (SK), but we prefer to work 100% remotely most of the time. Thanks to our location we are attractive choice for clients in US, DE, or UK.

👇 See porfolio & case studies 👇

What people are saying about us / Stefan Majiros

Because for small dev agencies, like reputation & client satisfaction is really important.

"I have been working with Stefan on several projects. He is the person you want in your team as he is not happy with half-done solution, he strives for perfection..."

"Shoutout and kudos to Stefan Majiros for documenting crucial steps on getting the mobilertc.aar library to build. Whithout his insights this would have been impossible."

"Dude, your React Native Android Fragments article should be seriously included in React Native documentation. Helped me a lot."

See more testimonials on Linkedin

Looking for mobile app developer company that will build your custom mobile app with React Native and serverless?

Building a custom software project requires effective cooperation, communication, excellence, and commitment. We use React Native and serverless to build custom mobile apps on time, on budget, and fully guaranteed - You will know before the start, how much the project would cost. We are not trying to sell just a few lines of code - instead, we will understand the end goal of your idea, understand your vision and then make it a reality aiming to become your technology partner.

Our Mobile App Development Services & Specialties


Serverless Cloud Integration

Integration of most used services (real-time data exchange, messaging, scalable databases, and file storage) from top cloud providers (AWS Amplify and Firebase) will help make your app resilient. We typically use NodeJS.


Mobile UI / UX Design Services

To maximize the value of your investment, the development always starts with market research and creating design first. After the custom design system is built, you will have the option to prioritize shipping features.


Chat, Audio, Video Calls + Streaming

Integration of video / audio streaming, or video calling is not rocket science. We can make a custom app where users would be chatting and adding audiovisual content using e.g. Agora or Twilio.


App Monetization: Accepting Online Payments And In-App Purchases

Planning to monetize your app? We can help you to implement a proper monetization strategy either via In-App purchases, subscriptions or external payment processors like Stripe.


Enterprise App Development

Looking for are specialists in proposing business management apps and complete corporate projects? We can help you develop a private mobile app for your in-company users.


IT Consulting (focused on React Native, Serverless)

Not sure if React Native and serverless are the right technology for you? Or just have questions you want to ask? Book paid-call with us and we will try to answer all your questions.


Authentication & Mobile Biometrics

We can protect access to resources with TouchID (FaceID) or PIN code authentication, besides classical authentication models like email / password, or social providers sign-in (Google Sign-in, Apple Sign-in).


Bluetooth & NFC

With NFC we can develop apps that read data from AirTags, or even official travel passports while Bluetooth could be used to communicate with proprietary mobile devices such as printers and sensors


Training: React Native & Serverless

If you already have your own in-house developers, you can book provide a 4-day training workshop about React Native and serverless cloud either remotely or on site.


3rd Party Libraries Integration

We can integrate almost any market-proven libraries (e.g. Scandit for scanning QR codes) or proprietary native mobile SDKs even when they were not built with React Native.


Apps Analytics, Crashlytics

Analytics and crashlytics (Firebase, Sentry, or BugSnag) are must-have for productions apps, so developers (or people responsible for app support) would always know how to get rid of bugs quickly.


Apple Health & Google Fit

If you need to access health data, we are here to help you! To provide an overview of users' personal health and fitness data we will use AppleHealth, Google Fit, and many others (Fitbit, or Samsung Health).

Find more about our services

Where to start? Just talk to us! Click on button below to get response < 48 hours.

or get free app cost estimate