ASP.NET remains a practical choice for web applications that need structured backend logic, integrations, strong Microsoft ecosystem support, or a clear path to Azure. The companies below work with ASP.NET, .NET, C#, and related technologies across projects ranging from SaaS products and customer portals to large enterprise platforms and legacy modernization.
Gilzor provides ASP.NET web development within its wider custom software and web product work. Projects can cover planning, UI/UX, application development, testing, integrations, and continued support after release rather than stopping once the initial version is deployed. Its published ASP.NET offering is aimed at custom applications where backend logic and maintainability matter over the longer term.
The company works from Warsaw and serves startups, SMBs, and product-focused businesses. That broader product development background can be useful when an ASP.NET application also needs frontend work, connected mobile functionality, QA, or ongoing product development.
OSKI Solutions develops ASP.NET and .NET software alongside broader backend, frontend, cloud, and product engineering work. Its ASP.NET capabilities include business platforms, APIs, SaaS products, automation systems, and other applications where server-side architecture plays an important role.
The company also works with C#, Azure, Umbraco, integrations, testing, deployment, and long-term maintenance. That mix makes it relevant for both greenfield applications and existing Microsoft-based systems that need continued development or modernization.
N-iX has a sizable .NET practice working on enterprise systems, platform-independent web applications, migrations, cloud projects, and modernization. Its .NET engineers use technologies from the Microsoft ecosystem for both new development and the maintenance or extension of established applications.
ASP.NET and ASP.NET Core are part of that capability, along with Entity Framework, web APIs, microservices, cloud architecture, and automated delivery infrastructure. The company has delivery operations across Europe, which makes it particularly relevant to larger organizations that need to assemble or expand a substantial engineering team.
A-listware provides .NET development through dedicated teams, software outsourcing, and broader custom application services. Its Microsoft-related capabilities include C#, .NET, SQL Server, and Azure, while projects may also include frontend development, testing, integration work, infrastructure support, and application modernization.
This model suits companies that already have internal technical leadership but need additional ASP.NET or .NET capacity. It can also support longer projects where the scope extends beyond application development into QA, support, or cloud infrastructure.
Itexus is particularly relevant when ASP.NET development sits inside a financial application. The company develops software for banking, lending, trading, investment management, insurance, and related fintech use cases, while its .NET engineers work with ASP.NET Core, C#, Entity Framework Core, Web API, SQL Server, and cloud technologies.
Its delivery options cover both complete product development and additional engineering capacity. Backend .NET work can be combined with cloud infrastructure, frontend frameworks, testing, AI, data engineering, and integration with third-party financial systems.
Leobit has a strong concentration on .NET and ASP.NET development. Its ASP.NET practice covers web applications, backend systems, and connected products, with ASP.NET Core used as one of the company's main technologies for modern web development.
The wider Microsoft stack includes .NET, Blazor, .NET MAUI, and cloud technologies. Leobit also operates development locations in Europe, including Ukraine, Poland, and Estonia, which gives companies several nearshore options for .NET product development.
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SoftPro builds custom software with a clear focus on Microsoft technologies. Its published stack includes ASP.NET, .NET Core, C#, Azure, React, and related web technologies, while its services cover custom software, web application development, cloud projects, modernization, and long-term support.
The Warsaw-based team can work on new web applications as well as established systems that need architectural updates or cloud migration. Its Microsoft orientation makes it particularly relevant when ASP.NET needs to sit alongside Azure infrastructure or a modern JavaScript frontend.
Net Devs works across .NET, enterprise software, frontend engineering, cloud systems, and AI-assisted development. Its Microsoft capabilities fit ASP.NET projects that require backend engineering together with frontend frameworks or cloud infrastructure rather than a narrowly isolated coding engagement.
The company operates from Warsaw and supports projects from early requirements and prototyping through testing, deployment, and continued iteration. Its stack also covers React, Angular, Vue, Node.js, Python, Go, and cloud platforms.
Lengreo provides .NET web development alongside its broader digital and web services. Its published .NET offering covers custom web platforms, application development, system integration, and performance work, while ASP.NET is also referenced in the company's application development content.
This is a somewhat different profile from a pure engineering outsourcer because the company also works in digital marketing. That may suit businesses where the technical build needs to sit alongside acquisition, positioning, or other commercial work.
UKAD works extensively with Microsoft technologies, combining .NET application engineering with Azure, Umbraco, Optimizely, frontend development, and modernization. Its published projects include SaaS and content-driven platforms built with combinations of .NET, Umbraco, React, and Next.js.
The company can provide complete delivery or dedicated engineers, making it relevant for organizations building new ASP.NET products as well as those replacing older .NET applications. Its European delivery locations include Poland and Ukraine.
ELEKS handles enterprise application engineering, cloud services, data platforms, cybersecurity, and product development. Its Microsoft technology capabilities include C#, .NET, ASP.NET Core, Azure, web APIs, and distributed application architectures.
The company is a reasonable fit for ASP.NET projects where the web application is only one part of a larger technical environment. Cloud architecture, security, frontend work, DevOps, consulting, and modernization can all form part of the same engagement.
SCAND provides dedicated .NET development services for both new applications and existing systems. Its .NET work covers web applications, enterprise software, integrations, migration, and custom development within the wider Microsoft ecosystem.
The company supports both short-term and long-term engineering requirements, so it can fit projects where a business needs a complete development partner or additional .NET specialists working with an established internal team.
Future Processing has a long-running Microsoft technology practice and is one of the more established .NET engineering companies in Poland. Its .NET capabilities include .NET Framework, .NET Core, ASP.NET, and ASP.NET Core, with work spanning custom systems, migrations, and enterprise applications.
The company is particularly relevant for mature organizations with existing software that cannot simply be replaced. Modernization can be handled gradually while preserving important business processes and integrations.
Innowise offers .NET development for web, mobile, desktop, and cloud applications. Its published capabilities include ASP.NET Core migrations, custom application engineering, software audits, integrations, modernization, maintenance, and the redevelopment of older systems.
The company has operations across several European markets and is a reasonable option for businesses that need a larger engineering provider capable of supporting several parts of the application lifecycle rather than only the ASP.NET backend.
Mobian is a European software development studio registered in Estonia, with engineers in Ukraine and clients across Europe and North America. The company provides .NET development for custom web applications, enterprise software, and cloud-based platforms, using ASP.NET, .NET Core, and Azure as part of its Microsoft technology stack.
Its broader development model includes backend engineering, APIs, cloud infrastructure, QA, legacy integration, and post-launch support. Mobian works through both outsourcing and outstaffing models, so businesses can hand over complete ASP.NET projects or add engineers to an existing development team. Its experience spans sectors such as healthcare, fintech, logistics, telecommunications, and enterprise IT.
ASP.NET is still a strong fit for companies building business-critical web applications, especially when the project depends on C#, Azure, APIs, integrations, or existing Microsoft systems. The companies in this list cover a wide range of needs, from new product development and SaaS platforms to legacy modernization and long-term engineering support.
The right choice usually comes down to project scope, team structure, industry experience, and how deeply the provider works with the Microsoft ecosystem. For more complex projects, it is worth looking beyond basic ASP.NET development and considering cloud expertise, integration experience, QA capabilities, and the ability to support the application after launch.
