Services Provided by Yojji

Mobile Consulting

Our experts provide competent assistance in enhancing an existing mobile initiative, developing MVP and PoC, analyzing the device compatibility, and developing a new mobile solution from scratch.

If you need advice on the improvement of your current solutions or develop a new app concept, our well-versed business analysts are always ready to address your business challenges and provide comprehensive support. Our mobile developers will conduct an independent code review and a UX/UI evaluation of an existing application and give some strategy tips. On top of that, if you need a brand-new product, our mobile app developers are ready to help you decide on your target platform and create a feasible prototype.

Mobile App QA

Our high-skilled QA team provides quality assurance services to make sure the final product delivers the best possible experience to the end-user.

We utilize multiple testing approaches and conduct various testing types: functional, regression, usability, performance, and security testing to guarantee your product’s stability and high security. Besides, our end-to-end testing helps you save money as we identify all errors before the product launch.

Design and UX

With our help, you get handy, user-friendly, and functional mobile solutions that help you achieve your business goals and meet all the needs of your target audience.

Our engineers focus on creating user-centric apps that build brand reputation, increase customer loyalty, and meet the needs of your customers. Yojji designers use an iterative approach to solve potential problems and have the necessary expertise to create interactive designs.

Cross-Platform App Development

We build cost-effective yet functional solutions that can be run on various platforms without making changes to the codebase.

We deliver best-in-class applications that look and feel native on any platform. A team creates a stable and reusable code, which allows you to reduce the release time and save costs. All hybrid mobile solutions we develop don’t have performance hiccups or compatibility issues because our main principle is to ensure the highest quality of work, regardless of the type and scale of the project.

Our Approach

We provide a future-proof mobile product by utilizing the Design Thinking approach. Thanks to using this methodology, we conduct extensive user research and deliver a stable product that features all useful functions that seamlessly meet users’ needs. Besides, we utilize the Agile methodology when it comes to project management. The efforts of the development team and the client team are consolidated to create advanced yet cost-effective solutions. On top of that, our clients will benefit from our flexibility in terms of coding and working hours.

Our Mobile Development
Services Process



Goal: Identify the app’s goal, the technologies it will be based on, and decide on methods to measure project success.

  • Identifying the main goals and objectives

    At this stage, the problems that a future app should solve are pointed out.


    • Brainstorming session

    • Generating new ideas


    A roadmap that defines the main goals and objectives

  • Understanding the target audience

    By analyzing users’ goals, demographics, and behavior patterns, we build a picture of the target audience.


    In-depth research


    A document with a detailed description of the target audience’s goals and constraints

  • Conducting a competitor analysis

    Studying the competitors’ apps to find out features that can be included in a new app to set this product apart from its counterparts.


    Competitor analysis


    Competitors’ analysis document

  • Choosing a mobile platform

    Mobile app developers analyze customers’ needs to decide on whether to suggest building a high-performance app with complicated logic for an iOS or Android platform or create a cost-effective mobile solution that will work on several platforms.


    A throughout analysis of mobile platforms


    A document with descriptions of a preferred platform



Goal: To elaborate an intuitive design.

  • Clarifying requirements

    Analyzing the initial data and discussing the main and additional requirements.


    Stakeholder interview


    A document with clearly identified project’s requirements

  • UI/UX Design

    The main goal of this step is to deliver an interactive and intuitive user experience with a polished look. By using various methodologies, we make sure the product design meets all the requirements set.

    • Information Architecture and Workflows

      After determining ​​the data a mobile app will collect and display to the end-users and workflows, we build the information app architecture.




      Mind Map
      It is a detailed breakdown of users’ interactions within the system and an app’s navigation structure.

    • Wireframes

      These conceptual layouts illustrate the app’s functional requirements. Known as low-fidelity wireframes, these mockups focus on user experience rather than on color schemes.


      Figma, Sketch


      Low-fidelity wireframes

    • Style Guide

      Style guides are established as a part of the design strategy. They feature various design patterns that are used by the developers to ensure visual consistency across the whole project.


      SC5, Frontify


      A style guide on various components: colors, patterns, text styles, sizes

    • Mockups

      Known as high-fidelity designs, they represent a final visual design of the product.


      Adobe XD, InVision


      High-fidelity mockups

    • Clickable Prototype

      Click-thru prototypes are used to simulate the app’s workflows and user experience.


      Figma, Overflow, InVision


      Clickable Prototype


      • Great for usability testing

      • Contributes to cost-savings

      • Serves as a useful tool for demonstrating the concept to stakeholders

      • Helps devs understand if the mobile solution is technically feasible

  • Maintenance and testing

    To provide a high-quality final product, mobile app designers should work in sync with mobile app developers to make sure the application is technically well implemented, without compromising the outer attractiveness side.


    Figma, InVision


    A document providing the necessary support for the development team



Goal: At this stage, we focus on product development. We use the Agile methodology, which means that we divide the process into short sprints, each of which is dedicated to a certain piece of a software product. At the end of each sprint, we provide sprint results for customer review.

  • Back-end/server technology

    Our backend engineers work on creating database and server objects that store, protect, and process data.


    Node.js, Angular.js


    Fast server-side development

  • API(s)

    With the help of various tools, we develop API(s) that ensure smooth communication between the application and a server database.


    Swagger, Restlet


    Developed API(s)

  • Mobile App Front-end

    At this stage, we develop all the components that users see and interact with when using an app.


    Swift, Java, Kotlin


    An app ready for testing



Goal: To check the application’s usability, security, compatibility, and performance.

  • Performance Testing

    This testing type is used to measure the performance of an app. Besides, it verifies load consumption, size, scalability, loading time, the time needed for responding to user requests. Performance testing involves load testing (checks app operation under a particular load) and stress testing (evaluates system behavior under extreme load).


    LoadUI Pro, Webload


    An application with the right performance

  • Security Testing

    Thorough security testing is performed to ensure your application doesn’t have data leakage.


    ImmuniWeb, QARK


    A secure application that doesn’t contain any vulnerabilities

  • Usability Testing

    At this step, the application’s functionality, overall app design, and the user happy flows are analyzed.


    Solidify, Mouseflow


    A bug-free application that runs smoothly


App Release and Support

Goal: Submitting an app to the app stores and timely improvement of the app to keep the audience engaged.

  • Submission to the Apple Store and Google Play

    For launching an app, we prepare needed metadata (category, keywords, description, launch icon, etc.), make sure an app follows all development guidelines for a particular platform, and submit it for review in the App Store. Usually, a review process takes up to several days. For Android-based apps, there is no review process, and your application becomes available within several hours after submission.


    Xcode, Google Play Console


    A user-friendly and highly functional app ready for use

  • App Updates

    To stay on top of a game, we constantly monitor the latest trends and make all the necessary changes based on user feedback and the target audience’s requests.


    Leanplum, Swrve


    Сompetitive application with a high demand

Frequently Asked Questions

If any of the questions haven’t been covered yet, in this section, you may probably find the answers.

How long does the mobile development process last?

It is impossible to indicate the exact time of the development of a mobile application because it depends on many factors, including the features and functionality of the application, the type of platform, the complexity of the design, the testing process, etc. You can contact us, and we will inform you of the approximate development time, taking into account the individual characteristics of your product.

How much does it cost to make an application?

As well as the development time, the cost of an application is highly individual and depends on the complexity of the application, its type, and the category. Our experts will calculate the development cost for you upon request.

What languages and technologies do you use for mobile application development?

We develop native apps for Android and iOS platforms as well as cross-platform apps. We use Swift and Objective-C for building apps for iOS, Java and Kotlin for Android app development, and React Native and Flutter for cross-platform development.

Why should I choose Yojji mobile development services?

By using the Agile methodology and offering flexible engagement models, we combine cost-effective rates with best-in-class solutions. We carefully approach the development of any application, regardless of its complexity and scale, and provide the best solutions at a competitive cost.

Do you need more information?

If you have any questions, our team is ready to provide you with any information upon request.

Have an idea?
Let’s Talk!
Contact person
Yevhen Piotrovskyi
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