Top 10 Leading ASP.NET Development Companies

ASP.NET remains among the top five most-used web frameworks and web technologies in the world according to Stack Overflow. The framework also maintains a strong and active community with a solid number of open-source contributions. On GitHub, ASP.NET has 37.6k stars, and thousands of forks.

According to Statista and Stack Overflow rankings, ASP.NET Core is used by nearly 19.7% of professional developers, while classic ASP.NET accounts for another 14.2%. But choosing the right ASP.NET development partner isn’t just about technical familiarity with the framework. You need a team that understands business objectives, system architecture, scalability, cloud infrastructure, and long-term product evolution.

In this article, you’ll find the best ASP.NET development companies and key insights to help you choose the right partner for your next web development project.

To help you choose the right partner, we analyzed 72 ASP.NET development companies and compiled a list of the top 10 leading vendors. The companies below stand out for their technical expertise, client feedback, industry recognition, and proven delivery track record.

Location: Ukraine/Poland
Company size: 50-249 employees
Hourly rates: $25 – $49/hr

Leobit stands out as a reliable ASP.NET application development company with in-depth hands-on expertise in building highly scalable, secure software. The company is a long-standing Microsoft Solutions Partner for Digital App & Innovation and Data & AI, which means it has verified capabilities in delivering cloud-first, enterprise-grade applications based on the Microsoft technology stack. Leobit has also been recognized as a top ASP.NET developer by Clutch in 2024 and 2025.

Over the last decade, Leobit has worked with companies ranging from Fortune 500 firms to Silicon Valley startups, resulting in 9 successful exits and 3 that have grown into unicorns. Their projects span fintech, sportstec, healthcare, logistics, real estate, media and entertainment, insurtech, and legal industries.

What sets Leobit apart as the best custom ASP.NET development service provider:

• Full-cycle development covering project discovery phase, UI/UX design, architecture development, engineering, QA, and maintenance
• ISO 9001:2015 and ISO 27001:2022 certification
• ISTQB Platinum partnership designation
• Global presence with offices in the US, EU, and a development center in Lviv, Ukraine

Leobit has earned an impressive 4.9/5-star rating based on 53+ positive reviews on Clutch. The company’s customers often speak highly of Leobit in their reviews, noting the team’s technical capabilities and customer-centric approach. Thanks to the company’s strong customer focus and orientation on customer success, Leobit was awarded the Silver Stevie Award in the Customer Service Department of the Year category in 2024 and 2025. Therefore, if you are looking for a long-term technology partner instead of merely a vendor, Leobit is the right choice for you.

Location: UK
Company size: 250 – 999
Hourly rates: $100 – $149 / hr

Another company that stands out as a trustworthy ASP.NET application development service provider is Transparity, which is based in the UK and specializes in Microsoft-centric technology services. The firm is certified by Microsoft as a Solutions Partner in various areas, such as Data & AI, Infrastructure, Security, Modern Work, Business Applications, and Digital & App Innovation. Transparity has in-depth knowledge of the Microsoft and ASP.NET ecosystem and provides development services as part of its digital transformation services.

The company works with mid-sized and enterprise businesses to design, build, and optimize business-critical web applications using the Microsoft technology stack.

What makes Transparity a good option:

• Combining deep Microsoft‑stack specialization with a delivery model built for complex, scalable, and security‑critical applications
• Integration‑heavy development, connecting ASP.NET systems with ERPs, CRMs, payment gateways, and legacy infrastructure
• Microsoft Nonprofit Partner of the Year 2025 designation

Transparity has a rating of 4.7/5 based on 22 reviews on Clutch. Their clients have given positive testimonials concerning the company’s approachability, knowledgeable team, and commitment to client success.

Location: USA
Company size: 50–249 employees
Hourly rates: $150 – $199/hr

Emergent Software is a US-based, Microsoft-focused engineering and consulting firm. As a certified Microsoft Gold Partner, they specialize in designing and implementing custom software, developing complex websites, optimizing SQL databases, and helping customers transition to the Azure Cloud.

Their services include ASP.NET MVC development and Azure cloud computing. In addition to that, Emergent Software is also selling and supporting Microsoft Productivity Software. Emergent Software typically works with mid-sized and enterprise organizations in the hospitality, leisure, information technology, and legal industries.

What makes Emergent Software an excellent choice:

• Full suite of SQL Server consulting services, including ETL development, data warehousing, and SQL database cloud migration
• Website security audit and remediation services
• DevOps-based development processes

Emergent Software has a 4.9/5 overall rating on Clutch, based on 35 client reviews. Clients praise the company’s efficiency in completing projects, its expertise, and its ability to solve complex problems.

Location: Poland / Israel
Company size: 250–999 employees
Hourly rates: $50 – $99/hr

Scalo is a Polish software development company providing .NET and ASP.NET development services for startups, scale-ups, and enterprise clients. With delivery centers in Poland and Israel, the company focuses on building robust, scalable web applications aligned with modern business needs.

Their services include custom ASP.NET application development, cloud-based systems, system integrations, and legacy modernization. Scalo works across industries such as energy and natural resources, finance, media, and manufacturing.

What makes Scalo stand out:

• 17 years of .NET development expertise
• Ability to kick-off project in 1-4 weeks
• Flexible cooperation and billing models
• Mature service delivery processes proven by NPS 68

Scalo has an overall rating of 4.6/5 on Clutch, based on 32 customer reviews. The company is recognized for its proven expertise in staff augmentation, broad industry expertise, and ability to quickly scale development teams based on project requirements.

Location: Poland
Company size: 10–49 employees
Hourly rates: $50 – $99/hr

Impicode is a Poland-based software development company specializing in .NET and ASP.NET solutions for startups and growing businesses. Despite its smaller team size, the company delivers highly tailored web applications with a strong focus on clean architecture, performance, and long-term maintainability.

Their services include custom ASP.NET application development, back-end engineering, API development, cloud integrations, and modernization of existing systems. Impicode often works closely with clients as a dedicated development partner, providing hands-on technical expertise and direct communication.

What makes Impicode a good option:

• Flexible engagement models
• Reliable delivery for small and mid-sized projects
• An on-site electronic systems software team that operates on low and high-level hardware

Impicode holds a 5/5 rating on Clutch, based on 12 reviews. Clients frequently highlight the company’s technical competence, successful problem-solving, and ability to deliver high-quality solutions within agreed timelines.

Location: Vietnam/Japan
Company size: 250-999 employees
Hourly rates: $25 – $49 / hr

Orient Software Development Corporation is a Vietnam-based software development company providing Microsoft .NET and ASP.NET development services to clients worldwide. With over two decades of experience, the company focuses on delivering scalable, secure, and cost-effective web solutions. Orient Software works with startups, SMBs, and enterprises across industries such as finance, education, and information technology.

What makes Orient Software stand out:

• Flexible engagement options (dedicated teams and project-based)
• Microsoft Solutions Partner designation in the Data & AI (Azure) and Digital & App Innovation
• Full lifecycle support, from architecture to post-launch optimization

According to Clutch, Orient Software is recognized for reliable delivery, effective communication, and consistent technical performance. While the company has 4 five-star reviews on Clutch so far, the feedback proves it is a strong option for businesses seeking scalable ASP.NET development at competitive rates.

Location: Poland / Germany
Company size: 6,000+ professionals
Hourly rates: $50 – $99/hr

Euvic is one of the largest technology companies in Central Europe, delivering comprehensive software development and IT services to enterprises worldwide. Euvic provides custom ASP.NET application development, cloud migration, and legacy modernization services. On top of outsourcing and staff augmentation services, they also provide several proprietary IT solutions for small and medium-sized energy companies and educational institutions. Their teams support clients across the finance, energy, e-commerce, travel, and transportation industries.

What makes Euvic stand out:

• Broad industry coverage across Europe
• 92% client retention rate and 25% year‑over‑year growth
• End‑to‑end support from consulting to building infrastructure and software development

The company has an overall rating of 4.8/5 on Clutch, based on 19 reviews. Euvic’s customers have recognized the company for strong project management skills and technology expertise.

Location: Sofia, Bulgaria
Company size: 250–999 employees
Hourly rates: $25 – $49/hr

Dreamix is a Bulgaria-based software development company delivering custom enterprise solutions with strong expertise in Microsoft technologies, including .NET and ASP.NET. The company partners with organizations across Europe and the U.S., helping them build scalable and secure web platforms. Their services include digital transformation, MVP development, and 24/7 managed support services. Dreamix focuses on long-term partnerships and often integrates closely with client teams.

What makes Dreamix a strong choice:

• Proprietary software accelerators for the airline industry
• Strong software engineering capabilities for manufacturing, aviation, and regtech industries
• Long-term support and product evolution services

Dreamix holds a 5/5 rating on Clutch, based on 33 reviews. Clients frequently highlight the company’s technical expertise in various domains, excellent communication skills, and collaborative approach.

Location: Poland/Germany/USA
Company size: 3,500+ employees
Hourly rates: $50 – $99/hr

Andersen is an international software development company providing full-cycle engineering services, including Microsoft .NET and ASP.NET development. With a large global team, Andersen supports startups, mid-sized businesses, and enterprises across industries such as telecommunication, automotive, and logistics.

They have 19 years of experience in .NET development and extensive expertise in building enterprise web applications, cloud-based systems, and scalable SaaS platforms. Andersen also offers dedicated development teams and staff augmentation for long-term product growth.

What makes Andersen a strong choice:

• Flexible engagement models (dedicated teams and project-based)
• Optional roles such as PMs, BAs, architects, UI/UX designers
• Experience working with large enterprises and Fortune 500 clients

According to Clutch, Andersen has an overall rating of 4,9/5 based on 129 reviews. Customers often mention their proactive problem-solving and the ability to quickly scale engineering teams to meet complex business needs.

Location: USA
Company size: 10–49 employees
Hourly rates: $100 – $149/hr

Pell Software is a Denver-based custom software development company that focuses on building tailored solutions for growing businesses. What sets Pell Software out is that they have developed dozens of custom modules and templates to build customer software faster, cheaper, and easier.

Pell Software typically works with small and mid-sized businesses that require hands-on collaboration and direct access to senior engineers.

What makes Pell Software a strong choice:

• 100% US‑based engineering team
• Custom software development using AI tools and pre-built modules to accelerate delivery and reduce costs
• Close client collaboration and transparent communication

According to Clutch, Pell Software has a 5/5 star rating based on 28 customer reviews. Customers emphasize their successful system integrations, strong communication skills, and cost effectiveness.

Picking the right ASP.NET Core development partner is a business decision, not just a technical one. The company you choose will shape your product’s architecture, security, scalability, and long-term costs. Here’s what to look for and what to avoid when shortlisting ASP.NET development agencies.

Before making a final decision, take time to carefully evaluate each ASP.NET development company. The following best practices will help you assess vendors more objectively and choose a team that aligns with both your technical requirements and business goals.

• Checking real ASP.NET Core experience. Not all .NET experience is equal. The ASP.NET Core framework significantly differs from the older .NET Framework in architecture, performance handling, and deployment flexibility. Ask potential vendors which versions they’ve been working with. Request examples of recent ASP.NET Core projects. A strong team should be able to clearly explain why they chose a certain architecture and what trade-offs they considered. If they struggle to explain their decisions in simple terms, that’s usually a warning sign.
• Reviewing case studies and client feedback. Case studies show how a company solves real business problems. Look beyond technical details and focus on outcomes. Did they improve performance? Reduce costs? Increase user adoption? Client reviews often reveal patterns. For example, whether clients were consistently happy with communication, projects stayed within scope and timeline, etc.
• Assessing architecture and scalability skills. ASP.NET Core is often used for high-load systems, SaaS platforms, and enterprise applications. Poor architecture choices early on can lead to expensive rewrites later. Ask how they handle high user traffic, database scaling, caching strategies, microservices vs. monolithic design, etc. A capable ASP.NET development company should be able to develop a system that grows with your business, with minimal redesign required.
• Evaluating communication and process. Technical skill alone isn’t enough. Poor communication can delay projects and create misunderstandings. Ask potential vendors how they plan sprints and define milestones. You should never feel uncertain about where your project stands. A reliable partner keeps you informed and sets realistic expectations from day one.
• Clarifying long-term support. Launching the product is not the end. In many cases, it’s just the beginning. Ask vendors about ongoing maintenance options, security updates, and possibilities of feature expansion. Just like any other software, ASP.NET Core applications require periodic updates to stay secure and efficient. A long-term support plan will prevent your system from becoming outdated or vulnerable.
• Evaluating security expertise. Security should not be an afterthought. ASP.NET Core offers strong built-in security features, but they must be implemented correctly. Discuss with a development company how they handle authentication and authorization mechanisms, and data encryption practices. If your application handles financial data, healthcare records, or sensitive user information, security expertise is non-negotiable.
• Conducting interviews with ASP.NET developers before signing. Before finalizing a contract, speak directly with the developers who may be assigned to your project. Ask practical questions about your project idea and listen carefully to their reasoning. You’re not looking for buzzwords. You’re looking for clarity, logic, and confidence. The way they explain complex concepts often reflects how they build software.

When comparing software development vendors, it’s easy to focus on surface-level metrics and overlook what truly impacts project success. The following pitfalls highlight what to avoid to keep your comparison process objective and aligned with your long-term goals.

• Choosing based on price alone. It’s tempting to compare hourly rates and go with the lowest offer. But hourly rates don’t tell you much about a company’s experience or skill set. Instead of focusing solely on hourly cost, consider total value and technical maturity. While senior talent typically comes at a higher cost, building a team composed entirely of senior engineers is generally considered an unsustainable long-term strategy. A well-balanced team that combines senior specialists with mid-level and junior developers often delivers the best results.

• Ignoring code quality practices. If a company cannot clearly explain how they ensure code quality, that’s a serious red flag. Clean architecture, code reviews, automated testing, and documentation are not optional. They are what keep your application stable and maintainable. Without structured quality practices, your project may suffer from hidden bugs and inconsistent coding standards. Over time, adding new features becomes slower and more expensive because the codebase becomes harder to understand.
• Assuming all .NET developers are interchangeable. A developer who worked mainly with older .NET Framework projects may not automatically have deep expertise in modern ASP.NET Core environments. Make sure the team actively works with current technologies and keeps up with Microsoft updates. Continuous learning and practical experience with modern tooling separate average teams from high-performing ones.
• Ignoring cultural and operational fit. Even technically strong teams can create friction if collaboration feels difficult. Misaligned expectations, slow responses, or unclear ownership can derail progress. Consider time zone overlap, communication style, and availability. Are they responsive? Do they provide structured updates? Do they take ownership of issues? A successful ASP.NET Core project depends on smooth cooperation as much as technical ability.

For the past 7 years, Leobit has been a Microsoft Solutions Partner and consistently demonstrated strong expertise in the Microsoft ecosystem. Currently, the company holds partner designations in Digital & App Innovation and Data & AI, which demonstrate our ability to deliver modern cloud-based applications and intelligent systems built on the Microsoft tech stack.

With over 70 successful ASP.NET projects delivered, Leobit has developed deep practical expertise in ASP.NET Core application development. Leobit supports clients at every stage of development, from product discovery and architecture design to deployment, optimization, and ongoing support. Whether the goal is building a new solution from scratch, modernizing a legacy .NET system, or scaling an existing platform, the team focuses on clean architecture, secure coding standards, and cloud-first strategies.

Below are some of Leobit’s ASP.NET projects worth mentioning.

Our client, a leading UK provider of stakeholder management software, approached Leobit to modernize their legacy system. The existing platform was built as a monolithic ASP.NET Web Forms application with a single-tenant architecture, which limited scalability and slowed down further product development.

To modernize the system without disrupting existing users, we followed a gradual migration strategy. In the first phase, we introduced a Strangler Facade pattern. This allowed us to build a new ASP.NET Web API back end alongside the legacy system while keeping the application fully operational.

Module by module, functionality was moved from the old Web Forms application to the new ASP.NET Web API back end and Blazor front end. With each transition, the Strangler Facade was updated to redirect more user requests to the new components and fewer to the legacy system.

The modernization also opened the door to innovation. We integrated the platform with Azure AI Foundry, deploying a separate OpenAI model to introduce intelligent, AI-powered features and enable future enhancements.

Our customer, a Swiss-based company specializing in location-based marketing solutions for retail businesses, approached Leobit to modernize their legacy application and improve overall system performance and flexibility.

As part of the modernization efforts, Leobit developed a custom admin panel using ASP.NET MVC for the back end and AngularJS for the dynamic, responsive front end. This combination enabled us to create a robust, user-friendly management interface tailored to the specific needs of the platform’s users.

The admin panel enabled retail clients to easily configure and manage beacons, launch and monitor marketing campaigns, and control push notifications in real time. By centralizing these capabilities within a flexible management system, the platform significantly improved retail analytics, providing businesses with clearer insights into customer engagement and campaign performance.

ASP.NET remains one of the most reliable and widely adopted frameworks for building secure, scalable, and high-performance web applications. Yet, the framework alone does not guarantee success. The outcome of your project depends on the expertise of the team behind it. The right ASP.NET development company will design scalable architecture, implement strong security practices, align technology with your business goals, and support continuous product evolution.

In this guide, we reviewed leading ASP.NET development companies based on technical capabilities, industry recognition, and client feedback. If you are planning to modernize a legacy system, build a cloud-native SaaS platform, or develop a custom enterprise application, partnering with an experienced Microsoft-focused team is essential.

If you’re looking for a trusted ASP.NET application development company with proven ASP.NET experience, Leobit is ready to help. Contact Leobit’s team to discuss your project goals and discover how their Microsoft-certified engineers can turn your ASP.NET vision into a scalable, secure, and future-ready solution.