.NET development company

Existek is a full cycle development house experienced in building a wide range of custom applications. We know how to make maximum use of .NET Framework advantages, whether we need to use our skills to build new software from scratch, perform complex integration or migrate a legacy application to the Web with ASP.NET.

Full cycle .NET development services

Our team of certified software engineers leverages years of experience to deliver best-in-their-class software products and secure and stable desktop and cloud solutions for enterprises, along with web and mobile applications.

Custom development

We will help you transform your requirements into brilliant software that pushes your business to a new level. Leveraging .NET to solve our customers' challenges is our conscious choice, shaped by the flexibility, reliability and constant support of the Microsoft technology stack.

Migration to .NET

Old technologies often depreciate the value of your legacy business applications. Existek team has extensive know-how in updating legacy applications and data to the latest technologies. We offer a full range of services that allow you to easily rebuild your legacy system, thus strengthening its security and boosting performance.


We offer our customers custom middleware for the integration of enterprise systems to ensure flawless communication between applications within your organization. Existek will carefully study your enterprise IT infrastructure and find the best way to manage data across various software solutions.

Solutions customization

As a .NET development company with a laser focus on custom solutions, we know that no two businesses have identical processes. Existek renders a full range of services related to third-party solutions customization according to your unique business needs, including APIs, UI customization, and functionality improvement.

Our works

We leverage our rich experience to add value to our collaboration with customers. We have established dedicated development teams of experienced developers to work hand in hand with our partners across the US, Europe and the rest of the world.

demo of application
demo of application

Our expertise

Existek is a team of professionals who are passionate about the Microsoft technology stack. We have mastered those technologies to create extremely reliable enterprise desktop solutions as well as rich internet applications to help your business migrate its data and operations to the cloud.

ASP.NET web applications

Our software engineering team has an extensive expertise in building fast, optimized, and functional web applications and portals.

  • Content management systems
  • Enterprise portals
  • Online shops and marketplaces
  • Media content distribution systems
  • Web services

Enterprise .NET solutions

Existek creates scalable and reliable enterprise-level applications aimed at achieving global stability and solving the challenges of modern businesses’ vast IT infrastructures.

  • Customer relationship management
  • Enterprise resource planning
  • Enterprise intranet and extranet
  • Document and project management
  • Corporate web portals

Why dedicated development team by Existek

We provide Dedicated Development Team service to empower our partners to quickly ramp up their human resources for ongoing projects and to deploy a large-scale IT project in a short period of time. We operate a large talent pool of developers who can become part of your in-house staff or work as a separate branch of your company for the period of time you actually need them.

  • Scalable dedicated development team: you decrease or increase the size of the team depending on the current workload.
  • Quick hiring process with zero cost: get ready to work with a team of developers of any seniority in two weeks.
  • Ready IT infrastructure and experienced management.
  • Transparent processes and reporting: you choose the project management tools and methodologies.
  • You screen and choose software engineers from our talent pool.
  • Access to vast Microsoft Stack technology expertise.
  • You have an in-house-like control level over the team structure and can replace and withdraw developers upon need.
  • Adjustable working hours according to your time zone preferences.

Our technology stack

We chose Microsoft technologies as our main language and framework for the development of both web-based and desktop applications. Technologies like C#, .NET, ASP.NET, AngularJS, and Xamarin help us give our partners the best possible outcome. Our skills are aimed at bringing innovation to each project on which we work.


  • SharePoint
  • Exchange Server
  • MS Dynamics
  • Azure

Web services

  • ASP.NET Web Services
  • WCF Services
  • JSON
  • REST

Web applications

  • ASP.NET Dynamic Data

Data services

  • MSSQL Server
  • Oracle
  • MySQL
  • MongoDB
  • dotConnect

User interface

  • WPF
  • Telerik
  • DevExpress
  • Infragistics
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Migration to the cloud

Does your legacy Windows desktop application restrict your business or limit your user base? Existek performs migration of desktop applications to the web with ASP.NET. In the times when cloud already has become all-around, we give to Windows application, including those based on Forms and VB6, a new life.









Why go with Existek for your next project?

Existek develops and improves enterprise software that helps businesses of all sizes to enable automation, analytics, and collaboration. We know exactly how to leverage the cutting-edge technology solutions to generate more revenue for your and create greater value for your customers.

Full-cycle of the services

Existek offers the full cycle of the services you might need to build an application of any complexity, from zero to final product, in one place. These services, among others, include product requirements analysis, UI/UX, development, testing, post-launch support, and updates.

High quality for lower price

Eastern Europe, especially Ukraine, is recognized as one the leaders in IT sphere. Our rates are at least 30% lower than prices in Europe or North America, which allows you to save money. Use your savings for marketing, new features, or other projects.

Agile methodologies

We use Agile as our main software development life-cycle model for the projects. Experienced project managers and Scrum masters will ensure that your project systematically meets all your requirements, goals, and milestones.

Highly-skilled developers

Equipped with the experienced and certified engineers, our team is capable of crafting compelling applications with maintainable and secure code.


    Call us

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    Our locations

    Ludwika Warynskiego 3a,
    Warsaw, Poland, 00-645
    Strada Banu Antonache 40-44,
    Bucharest, Romania, 011663
    Kosmonavtiv Ave, 39
    Vinnytsia, Ukraine, 21021
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