.NET development company

Equipped with experienced and certified engineers, our .NET development company is capable of crafting compelling applications with maintainable and secure code.

Full-cycle .NET development services

Our certified software engineers leverage years of experience to deliver best-in-their-class software products and .NET development services. Existek’s team specializes in creating secure and stable web, cloud, mobile, and desktop solutions powered by .NET.

Custom development

Our custom .NET development company will help you transform requirements into brilliant software that pushes your business to a new level. Solving our customers' challenges with .NET is our conscious choice, shaped by the Microsoft technology stack's flexibility, reliability, and constant support.

Migration to .NET

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


Our experts offer customers custom middleware for the smooth 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 primarily focusing 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 unique business needs, covering APIs, UI customization, and functionality improvement.

Cloud migration

Existek can also assist you with moving apps, services, or infrastructure built on the .NET framework from traditional hosting environments to cloud-based platforms. We help unveil the benefits of cloud .NET solutions. Our team provides all the required services, from careful migration planning to smooth transition execution.

.NET development consulting

Existek offers first-hand experience helping businesses of different specifications build sophisticated .NET applications. We’ll gladly assist your organization with addressing some specific needs and questions. Our .NET development company embraces such services as gathering business requirements, providing tech solutions, and suggesting relevant market practices.

Our works

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

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demo of application

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What our customers say?

5.0 five stars

CTO, Initial Force AS

The Existek team satisfactorily increased development bandwidth and provided high-quality services. The developer worked well within the project management structure. The team delivered constant improvement to the project. They were pleasant and flexible to work with. 
5.0 five stars

Chief Digital Strategist, SparkYou Consulting

The most remarkable thing about Existek is that they're capable of delivering the most advanced functionality as requested and adapt to their customer's demands quickly.

Our expertise

Existek is a team of professionals passionate about the Microsoft technology stack. We have mastered those .NET technologies to create highly reliable and functional solutions to help your business grow and deliver extensive experience and technical expertise for your customers.

ASP.NET Core web development

Our .NET development company has extensive expertise building fast, optimized, and functional web applications and portals. ASP.NET Core web development services embrace delivering the following solutions.

  • Content management systems
  • Enterprise portals
  • eCommerce stores 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 unified systems
  • Document and project management
  • Corporate web portals

.NET mobile and desktop development

We focus on leveraging the latest technologies while following best market practices. Our .NET developers will gladly assist you with creating beautiful and functional mobile and desktop solutions.

  • .NET multi-platform app UI
  • Cross-platform hybrid app
  • Mobile applications with .NET MAUI
  • Blazor hybrid apps with WPF and Windows Forms
  • Xamarin app support, updates, and migration

.NET microservices

Our .NET development team also helps with building and deploying microservices. That focuses on delivering highly scalable and independently deployable services.

  • .NET microservices architecture
  • API development
  • .NET app modernization
  • Containerized Docker apps
  • Cloud-native applications

.NET software development services for various industries

Our .NET development company continuously focuses on unlocking new possibilities and driving innovation in your business. We combine first-hand expertise to build modern applications across different domains and industries and provide .NET consulting services.




Manufacturing & automation

Business intelligence

Transport & logistics




Why a dedicated development team by Existek

We provide the dedicated .NET development team service to empower our partners to ramp up their human resources for ongoing projects quickly and deploy a large-scale .NET project in a short period. We operate a large talent pool of .NET software developers who can become part of your in-house staff or work as a separate branch of your company when you 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 .NET programmers of any seniority in two weeks.
  • Ready IT infrastructure and experienced management: we help set up your efficient process of .NET software development.
  • Smooth processes and reporting: you choose the project management tools and methodologies.
  • Broader talent pool: you screen and select software engineers from our talent pool.
  • Required expertise: access to vast Microsoft Stack technology expertise.
  • Transparency: you have an in-house-like control level over the team structure and can replace and withdraw .NET developers upon need.
  • Flexibility: adjustable working hours according to your time zone preferences.

Our technology stack

We choose Microsoft technologies as the main stack for creating a wide range of successful .NET applications. Technologies like C#, .NET, ASP.NET Core, .NET MAUI, and others help us give our partners the best possible outcome. Our skills aim to bring innovation to each project we work on.

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ASP.NET Core Blazor

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Google Cloud

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SQL Server

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Stages of custom .NET development process

Whether the team works on a web application, cloud-based solutions, or any other type of .NET development project, they need to set up an efficient software development process and undergo the following stages step by step.


Our .NET application development company provides comprehensive requirements research and market analysis to define the core features and create the software development roadmap.


Existek's team helps set project goals and deliver functional .NET solutions. We compile the SRS Document as a basis for validating the final product against the initial requirements.


This stage covers the architecture planning and the project structure creation. We focus on delivering the logical structure to organize your project and offer robust architecture. The .NET stack varies based on the project needs and the business-related structure of your solutions.


Based on the defined specifications, we are ready to handle the core stage of building the outlined .NET products and services. Our .NET developers apply the latest technologies, design patterns, and security measures to deliver successful solutions while covering organization-specific needs.


The QA specialists ensure the software's quality, reliability, and success by identifying and resolving defects, validating functionality, and verifying compliance with requirements and standards.


Our .NET application development services cover planning and executing the release process with a focus on successful deployment and software adoption.


The process also involves iterations and feedback loops for continuous improvement. Existek's specialists can help maintain and support the implemented .NET development projects to keep up with the fast-changing market demands.

Migration to the cloud

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









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 cutting-edge .NET development solutions to generate more revenue for you 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 is recognized as one of the leaders in the IT sphere. Our rates are at least 30% lower than prices in Western 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.

More on .NET development services

How to manage .NET projects with Existek?

We have a decade-long experience implementing .NET projects with the latest management approaches. Existek regularly assesses and adapts management strategies based on project-specific needs. Our management experts leverage proven technologies and practices to set up an efficient and smooth process. Besides, the role of the project manager can be taken by your in-house team member if you already have the required specialist

What are the advantages of custom .NET development services?

Bringing the functionality and tools offered by the .NET platform, development teams can leverage a wide variety of projects and services. Custom .NET development services focus on delivering high performance, cross-platform compatibility, security, and enhanced productivity.

How to find a reliable .NET development company?

It’s become a common practice to apply for the .NET development services of third-party providers. Businesses have the chance to partner with experts with the relevant expertise and required experience. Every company is responsible for extensive market research to find a provider that aligns with all the outlined project requirements.

What are the good qualifications of the development staff?

Over the years, the technology ecosystem has experienced numerous updates and changes that enable .NET developers to create incredible software, including web, desktop, mobile, and other solutions. We provide professional developers with specialized expertise and knowledge of the latest .NET technology and tools.

How to set up efficient communication with the .NET software development company?

As a matter of Existek's principles, we encourage direct and open communication with our clients and can provide a dedicated project manager. Our dedication to effective communication goes beyond the project's initial stages, extending into the ongoing support and maintenance phases. We ensure visibility and collaboration through the entire software development lifecycle.


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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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