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Katelyn Gleason
Katelyn Gleason Eligible
Xfive’s team rental model helped me easily acquire a new team member for our project. Marek has been working with us for many months and although he is an external contractor, I feel like he's a part of our family now.
Home Services Web & Mobile Application Development

Web & Mobile Application Development

From your initial concept to your final product, Xfive will guide you through the process of building a quality application aligned with your business objectives.

Our process

  1. Discovery – more than a decade of experience has taught us that no client is the same. At the beginning, we will spend some time talking together to better understand your ideas and needs.
  2. Proposal – once we gather and analyze information about your project, we will propose the best solution for you – architecture, technology and methodology – should it be an agile development based on prepaid hours packages or a waterfall model with a fixed price quote.
  3. Agreement – we digitally sign a mutual agreement with the project specification and set up your team consisting of necessary roles like certified project managers, UX / UI designers, developers and quality controllers.
  4. Design & Development – if your project is agile, we will work in so called sprints to deliver project features in one or two-weeks cycles. In the waterfall model we usually design all screens of your app before we begin development.
  5. Testing & Feedback – we deploy your application to a password protected area to allow early review of its features. Our quality controllers will do a thorough QA of your app as a part of the sprints or at the end of the development phase.
  6. Release – we will help you to choose the best hosting platform for your web application and deploy it there or publish your mobile application in App Store or Google Play.
  7. Support & Maintenance – we will take care of your day-to-day online presence and let you focus solely on your core business. We will keep your app safe and up-to-date and add more features as your business and user base grows.

Our principles

In our development process, we focus on the following core principles:

  • Innovation: We use modern, yet time-proven front-end and back-end development stacks which allow us to work faster and more effectively.
  • Quality: All of our developers have access to a number of testing devices and Browserstack emulators to test applications early in the process.
  • Performance: Performance isn’t just a buzzword for us. We test projects with Google’s Lighthouse and other tools on a regular basis during the development.
  • Security: Although not always trivial, implementation of Content Security Policy is one of the most effective ways to prevent common security threats like cross-site scripting.

Our skills

  • Ruby on Rails

    Ruby on Rails is a time-proven platform for fast development of web applications so you can deliver your product to market as soon as possible. We use Ruby on Rails to provide robust back-end solutions.

  • AWS

    Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. We use AWS in our back-end projects.

  • React

    Are you after creating a complex interface for your web application? Or, even better, for your mobile app? We recommend React and its rich ecosystem.

  • Angular

    Do you use Angular to build advanced and scalable web apps? We think that’s a great idea!

  • Vue

    You think Vue is a versatile solution which can enrich your current website? We fully agree. Or, perhaps, you’d like to create a modern web application with this neat tool? You’ve got our support.

  • JavaScript

    Gone are the times when jQuery ruled them all. With vanilla JavaScript we are able to replace jQuery and save dozens of kB.

  • ES6

    ES6, also known as ECMAScript 2015, is a major update to JavaScript which adds a lot of new features to the language. We use ES6 in our projects to improve code quality and maintainability.

  • Performance

    We see performance as a part of UX and understand performance optimization as a series of small improvements. We don’t hesitate to take these steps.


    ITCSS is CSS methodology by a renowned CSS author Harry Roberts. We are big proponents of ITCSS (hint: google it) and use it in all our projects to make their CSS scalable and maintainable.

Why us




Xfive has over 14 years of experience, with hundreds of apps and websites built with a broad spectrum of technologies delivered to satisfied clients.




No client is exactly the same. Our skills range allow us to recommend the right technologies for each client and deliver quality work on time.




Xfive is able to support clients in every time zone with representatives located in San Francisco, Krakow and Melbourne.




We are Agile and love using Scrum and Kanban which gives our clients full flexibility and transparency in their projects and requirements management. The ability to adapt and respond to changes is our primary goal.