Services Provided by Yojji

Mobile App Back-end Development

Our software engineers deliver high-quality mobile applications that are up-to-date with the recent trends and win your customers’ loyalty.

Our team of backend experts creates a custom back-end solution quickly and with care to every code piece. By using only cutting-edge technologies and programming languages (JavaScript, Python), we dive deep into your app’s business logic and synchronize all data across multiple platforms. We make sure your application is reliable, secure, covers all needs of end-users, and can be seamlessly integrated with third-party services.

Back-end Application Development

We develop efficient and scalable back ends tailored to your business needs and that are called to solve certain issues.

By utilizing the latest technologies, we build fault-tolerant web solutions for various enterprises that process large volumes of data. During back-end application development, our engineers create a robust back-end from scratch, optimize and refactor an app, and add new features that extend the functionality. Complex web apps we deliver offer high stability, security, and scalability.

Technical Back-end Audit

Accomplished professionals offer a thorough back-end audit both to startups and large enterprises to optimize an existing solution or move a system to a new environment.

The technical back-end audit we conduct focuses on the identification of bottlenecks, refactoring the code, revamping the architecture, improving app optimization, and integration of various services. After the audit is finished, we round up detailed reports and give our recommendations on how to prevent possible risks and eliminate existing ones.

Cloud Back-End Solutions

We deliver innovative cloud-based solutions that help your system scale naturally with the best cloud platforms in the industry.

Our experts have deep knowledge and extensive experience in developing cloud products for businesses of all sizes. The products we deliver are scalable, run smoothly under heavy workloads, and are highly efficient as they can handle big data.

Our Approach

Yojji offers services of both cross-functional teams and individual backend engineers. Our experts are well-organized, goal-oriented, punctilious, and flexible in terms of technologies and approaches used. Our development process is based on the Agile approach, which involves conducting regular sprints, each of which is devoted to working on a specific component of the program. Using this approach allows us to analyze and evaluate the results of our work.

Our Backend Development
Services Process


Entities and relations diagram

Goal: To create ER diagrams that serve as a formal representation of what data should contain and the relationship of entity sets in a database. Besides, ER diagrams help to define the requirements for the project.

  • Entity definition

    At this stage, all entities are identified and rendered using geometric shapes.


    Entity determination session.


    Visualization of certain entities.

  • Relationships identification

    Definition and designation of relationships between entities.


    Сonnection of entities using special symbols.


    Visual illustration of relationships between entities.

  • Adding attributes

    At this stage, key attributes are added.


    Adding entity attributes.


    Visualization of entity attributes.

  • Completing the diagrams

    At this stage, all objects are connected by different lines, and all connections are described. Each entity can have several relationships or none at all.


    Completing all connections and descriptions.


    A ready conceptual data model diagram.


Database design

Goal: To design the database based on user requirements and create physical and logical design models for the chosen database system.

  • Logical model design

    A logical model is created. It describes the data in detail (entities, relationships between them, primary keys for each entity, and attributes) and does not focus on physical implementations.


    • Specifying all the entities with primary keys.

    • Specifying concurrent relationships between entities.

    • Identification of entity attributes.

    • Conducting the normalization process.


    A detailed logical data model.

  • Physical model design

    This model describes the main practices and implementations of the logical model.


    • Converting the entities into tables.

    • Transforming the relationships into foreign keys.

    • Transforming data attributes into columns.

    • Modifying the data constraints.


    A ready physical model design.


Design endpoints and documentation

Goal: To develop endpoints and create documentation describing resources and methods to accelerate maintenance and updates.

  • Identification of resources & states

    Experts define resources and their states (there can be several states). After that, a diagram is created that allows devs to understand what resources are important and what resources are data attributes.


    Postman, Swagger, Mulesoft


    A state machine diagram.

  • API documentation

    At this stage, we create API documentation that contains relevant endpoints of the API, request examples, various errors with the status codes and messages for them.


    OpenAPI, API Blueprint, Swagger


    Accurate API documentation.


Implement API

Goal: To build the API with the help of various programming languages according to the API design.

  • Building the API

    Depending on the project, we decide on the platform, framework, and programming language we use. We make sure the developed API matches the approved design.


    Python, JavaScript


    Implemented API.


Writing tests & Deployment

Goal: To aid the debugging process and make sure the API is secure, functional, and reliable, development testing and use-case testing are performed. After the testing stage, the backend is deployed.

  • Writing tests

    Various tests to validate the API’s functionality are used. These tests are added both to individual requests and collections.


    Postman, JMeter


    Test reports stating a properly functioning API.

  • Deployment

    The backend is deployed using various approaches: either with the help of cloud service or using the dedicated host.




    Deployed backend.

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 backend development process last?

The development time depends on the complexity of the project. A simple project can be completed in 1.5 months, while a complex program can take about three months to build.

How much do backend development services cost?

The cost of services is calculated individually for each project, and it depends on:
- The amount of data;
- Technical requirements;
- The number of professionals working on the project.
You can contact us to find out the development cost specifically for your project.

What programming languages do you use for backend development?

We have extensive experience in JavaScript, Python. Besides, we can always find a developer with solid knowledge of a specific tech stack your project needs.

Why choose Yojji?

Yojji specialists have the necessary expertise to board your web and mobile project. Here are the advantages you get if you choose Yojji as a provider of backend development services.
- We utilize the Agile approach, so you can be 100% sure that your project will be of the highest quality, be delivered on time, and within the allocated budget.
- We ensure clear and effective communication at any stage of the development process. You receive updates on your project regularly and can track the progress at any time.
- Our qualified backend engineers have an impeccable reputation and solid experience in delivering top-notch web and mobile solutions.
- We deliver complex back-end development services by offering the perfect balance of high quality and competitive pricing.
- Our crew of backend engineers is flexible and reliable, we adjust the team according to your business needs and project requirements.
- Our experts offer excellent code quality because they check it at every step of the development process.

Do you have any more questions?

If you have any questions, reach out to us. We are always ready to provide all the necessary information.

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