Enterprise-Grade .NET Development Company for Scalable Business Applications
Updated
.NET Development Services We Provide
Custom .NET Application Development
Web Application Development
Enterprise Application Development
Software Product Development
Migration and Modernization
API Development and Integration
Cloud Application Development
Maintenance and Support
Why Choose Our .NET Development Company
Expertise in the .NET Framework
Our team works extensively with the Microsoft .NET ecosystem, including ASP.NET, .NET Core, and related technologies. This deep technical foundation allows us to build secure, scalable, and high-performing applications that stand up to real-world business demands.
Access to Skilled Professionals
You get direct access to experienced .NET developers who understand architecture, database integration, security, and performance optimization. Our professionals bring practical problem-solving skills, not just theoretical knowledge.
Customized Solutions
We don’t believe in one-size-fits-all development. Every solution is designed around your business goals, workflows, and technical requirements. Our team collaborates closely with you to ensure the final application fits your needs today and can adapt tomorrow.
Time and Cost Savings
By partnering with our .NET development company, you avoid the overhead of building and managing an in-house team. We follow proven development processes and use established tools, helping you reduce development time while keeping costs predictable.
Quality Assurance and Support
Quality is built into every stage of our development process. We conduct thorough testing and code reviews to ensure reliability, security, and performance. Post-launch, we continue to support and maintain your application to keep it running smoothly.
Focus on Your Core Business
Outsourcing your .NET development to us allows your internal teams to focus on strategic priorities. We handle the technical execution, so you can concentrate on growth, operations, and customer experience.
Scalability and Flexibility
Our .NET solutions are designed to scale as your business grows. Whether you’re starting with a small application or expanding into an enterprise-grade system, we build with flexibility in mind so your software evolves alongside your business.
Why Do You Need Our .NET Development Services
Lack of In-House Expertise
Not every organization has experienced .NET developers in-house. By working with our .NET development team, you gain immediate access to professionals who understand the framework inside out and can build reliable, production-ready applications without a steep learning curve.
Time Constraints
Tight deadlines demand focused execution. Our .NET development services help accelerate delivery by assigning dedicated experts who work efficiently, follow proven processes, and keep projects moving without unnecessary delays.
Complex Projects
Large-scale and enterprise-grade applications come with architectural, integration, and scalability challenges. Our team handles complex .NET projects by designing robust systems that integrate smoothly with existing platforms and support long-term growth.
Cost-Effectiveness
Hiring, training, and maintaining an internal team can be expensive—especially for short-term or specialized projects. Outsourcing to our .NET development services helps control costs while still delivering high-quality software.
Access to Advanced Tools and Technologies
Our developers work with modern development tools, frameworks, and best practices. This allows us to deliver efficient, secure, and well-optimized .NET solutions without requiring you to invest in additional infrastructure or tooling.
Maintenance and Support
Software needs ongoing care after launch. Our .NET development services include continuous maintenance and support, covering updates, bug fixes, performance improvements, and feature enhancements to keep your application stable and secure.
Focus on Core Business
By trusting us with your .NET development needs, your internal teams can focus on strategic priorities instead of technical execution. We manage the development workload while you concentrate on business growth and operations.
Solving IT Challenges In Every Industry, Every Day.
.NET Development Methodology
.NET is a free, cross-platform, open-source developer platform for building many kinds of applications, in Microsoft’s own words, and it can run programs written in multiple languages. This section shows what happens between that code and the processor, groups the eight .NET development services above, and sets out how the work runs, what lands on your side of the table, the choice between .NET and .NET Framework, four ways to hire .NET developers, what moves the cost, and how to compare .NET development companies, including us.
From custom .NET application development to maintenance and support, each one described above.
Depending on the seniority and mix of the team, as published on our about page.
From requirements gathering to maintenance and updates, as this page’s methodology sets them out.
The repository and the cloud accounts are in your name, with no licence back to us.
On this page
- What .NET is, and what happens between your code and the processor
- Custom .NET software development services, grouped by what they change
- How a .NET build runs, step by step
- What lands on your side of the table
- .NET or .NET Framework: which suits a server app
- Four ways to hire .NET developers, compared
- What moves the cost of .NET development
- How to compare .NET development companies
- .NET development questions, answered
- More about .NET development
- Talk to our engineers
What .NET is, and what happens between your code and the processor
Microsoft’s documentation sets out how that code runs, the managed execution process, in four steps: a compiler that targets the runtime, compilation into common intermediate language (CIL) with its metadata, just-in-time compilation of that CIL into native code, and execution by the common language runtime, which also provides services the code can use while it runs.
Figure 1. The managed execution process, and Microsoft’s two implementations for server apps
Steps 1 to 4 are Microsoft’s managed execution process. The two implementations, their version ranges and the two closing lines are from Microsoft’s page on choosing between .NET and .NET Framework for server apps, and the Windows line from its .NET Framework overview. Nothing in the figure is a Sthenos measurement.
This page names both lines of the platform: ASP.NET and .NET Core in its expertise card, and the .NET framework beside Microsoft Azure in its cloud card. Microsoft’s own table puts .NET Core 1.0 to 3.1 and .NET 5 and later under .NET, and versions 1.0 to 4.8 under .NET Framework, which its overview describes as a technology that supports building and running Windows apps and web services.
Microsoft also publishes how long each release is supported. On its .NET support policy, Long Term Support releases get free support and patches for three years and Standard Term Support releases for two. Read on 11 September 2026, that page lists .NET 10, an LTS release, as supported until November 14, 2028, and both .NET 9 and .NET 8 as reaching end of support on November 10, 2026.
Custom .NET software development services, grouped by what they change
The eight custom .NET development services above fall into three kinds of work. Every line below uses the service’s own wording from this page.
- Custom .NET applications tailored to specific business requirements.
- Web applications built with ASP.NET and modern .NET frameworks.
- Enterprise applications for complex processes, large data volumes and multi-system integrations.
- Software products, from idea to launch.
- APIs that exchange data between applications, platforms and third-party services.
- Cloud-ready and cloud-native applications using Microsoft Azure and the .NET framework.
- Migration of legacy systems or older .NET applications to modern .NET versions.
- Maintenance and support: bug fixes, performance tuning, security updates and functional enhancements.
How a .NET build runs, step by step
The eight steps are this page’s own .NET development methodology, shortened.
- Requirements gatheringBusiness goals, functional and non-functional requirements, constraints and integrations, documented for scope clarity.
- Planning and designA project plan of architecture, timelines, resources and milestones, and the solution design.
- Development iterationsStructured sprints, each building and refining specific features, with reviews and feedback.
- Coding and testingUnit, integration and system testing alongside development, to established coding standards.
- Continuous integration and deploymentSmooth code merges, automated testing, stable builds and deployment pipelines.
- Quality assurance and UATFunctionality, performance and usability validated, then user acceptance testing before release.
- Deployment and supportProduction deployment with deployment assistance and immediate post-launch support.
- Maintenance and updatesBug fixes, performance improvements, security updates and feature enhancements.
The cadence under every step is the one published on our about page: two week sprints, so working software arrives every two weeks, and a first production release typically lands in three to six months.
What lands on your side of the table
The six items below are published on our software development services page, and none of them is specific to one language.
- The repository and the cloud accounts, in your name from the first commit.
- A written scope and a costed roadmap, before any build starts.
- Working software every two weeks, not a status report about software.
- Architecture and a security posture you can put in front of a reviewer.
- Infrastructure your own engineers can run once we hand it over.
- Monitoring, maintenance and a roadmap after launch, priced up front.
.NET or .NET Framework: which suits a server app
Microsoft answers this on one page, Choose between .NET and .NET Framework for server apps. Both columns below restate it.
.NET
Microsoft’s preferred version for server development- Works cross-platform: a web or service app runs on Windows, Linux and macOS.
- Lets you target microservices, with a mix of technologies across a service boundary.
- Supports Docker containers, with a much smaller image than .NET Framework.
.NET Framework
The reasons to stay are specific and limited- Your app already uses it. In most cases, Microsoft says, you don’t need to migrate, and it recommends .NET as you extend the app.
- Your app uses libraries or NuGet packages that aren’t available for .NET.
- Your app uses technologies .NET lacks, such as ASP.NET Web Forms, ASP.NET Web Pages or Windows Workflow Foundation.
This page’s migration and modernization service moves legacy systems or older .NET applications to modern .NET versions. The right-hand column is the one to settle before that move is scoped.
Four ways to hire .NET developers, compared
Sthenos sells .NET work in the four commercial shapes published on our software development services page. The table restates that page’s comparison.
| Model | How it is priced | Where it fits | Where it goes wrong |
|---|---|---|---|
| Fixed price | One number for a defined scope | The specification is genuinely settled and unlikely to move | Every change becomes a negotiation, and the buffer is priced in whether you use it or not |
| Time and materials | Rate multiplied by hours actually worked | Scope will evolve | No ceiling unless you set one deliberately |
| Dedicated team | Monthly, per named engineer | Continuous product work over quarters, not a single project | You are paying for capacity even in a slow month |
| Staff augmentation | Per person, into your existing team | You have the plan and the management, and need hands | You own the outcome, so weak internal direction shows up fast |
Whichever shape you choose, settle the commercial terms in writing before the statement of work is signed: a ceiling on spend, the notice period, who owns the repository, what happens to the cloud accounts, and what counts as done.
What moves the cost of .NET development
Two published figures sit under every engagement model, both on our about page. The drivers under them carry no number, because a number without your scope attached to it is decoration.
- How settled the scope is. A settled scope can be quoted as a fixed price. An unsettled one priced as though it were settled is where the buffer, and the argument, comes from.
- The seniority and mix of the team. This is the stated reason the rate band has a range at all.
- The integration count, and whether the other side is documented. An integration into a modern documented API is routine. An integration into an undocumented system that somebody has to reverse engineer is a project of its own.
- The non functional requirements. Availability targets, performance under load, and how deep a security review the system has to survive are architecture decisions with a cost, not adjectives.
- Data migration. Reconciling the data, proving it moved correctly, and deciding what to do with the records that do not fit the new model.
- What happens after launch. Get deployment and maintenance priced up front, rather than sold back afterwards.
How to compare .NET development companies
These questions apply to any .NET development company or enterprise application development company, Sthenos included. The first two rest on Microsoft’s published policy; the rest are published on our software development and custom software development pages for any vendor.
- Ask which .NET release the system will target, and whether it is a Long Term Support release. Microsoft gives LTS releases three years of free support and patches, and STS releases two.
- Ask whether the migration has to leave .NET Framework at all. Microsoft’s own guidance lists the cases where staying on it is the right call.
- Ask what they have integrated with, by name and version. Experience with a platform and a completed integration against it are different claims.
- Ask what happens when the estimate is wrong. The answer tells you how the relationship will actually work.
- Ask who reviews the code, and whether that person can veto a merge.
- On testing, ask specifically what is automated and what is manual.
- Ask what documentation is a contractual deliverable, not what they promise to write.
- Ask which certifications are audited and which are self declared, then ask for the report date. Our about page lists what Sthenos does not hold, including a SOC 2 report and an ISO 27001 certificate.
.NET development questions, answered
Can we hire .NET developers into our own team?
Yes. On our software development services page, staff augmentation adds engineers per person into your existing team, for when you have the plan and the management and need hands, and a dedicated team is priced monthly, per named engineer, for continuous product work over quarters. Our team augmentation page covers the first in detail.
What is the difference between .NET and .NET Framework?
Microsoft lists them as the two supported implementations for building server-side apps. .NET covers .NET Core 1.0 to 3.1 and .NET 5 and later and runs on Windows, Linux and macOS; .NET Framework, versions 1.0 to 4.8, supports building and running Windows apps and web services. Microsoft calls the latest .NET the preferred version for server development.
Which .NET releases does Microsoft support?
Long Term Support releases get free support and patches for three years and Standard Term Support releases for two. Read on 11 September 2026, Microsoft’s support policy page lists .NET 10 as an LTS release supported until November 14, 2028, and .NET 9 and .NET 8 as reaching end of support on November 10, 2026.
What is ASP.NET Core?
In Microsoft’s words, ASP.NET Core is a cross-platform, high-performance, open-source framework for building modern web apps using .NET. The web application development service on this page builds with ASP.NET and modern .NET frameworks.
How much does .NET development cost?
Sthenos rates are $150 to $250 per hour, depending on the seniority and mix of the team, and a typical project runs $50,000 to $200,000. Where the scope is clear we quote a fixed price for a defined outcome, with a costed roadmap before any build starts.
Who owns the code you write?
You do, entirely, from the first commit. The repository and the cloud accounts are in your name, with no licence back to us and no dependency on us continuing to exist.
How long does a .NET project take?
Sthenos works in two week sprints, so working software arrives every two weeks and a first production release typically lands in three to six months. A date more precise than that comes out of discovery, because it depends on scope rather than on goodwill.
More about .NET development
Services. Custom software development, software development services, enterprise software development, cloud migration and optimization, Azure services, Microsoft services, team augmentation.
Standards and documentation, at the source. What is .NET, .NET or .NET Framework for server apps, the managed execution process, ASP.NET Core overview, .NET Framework overview, the .NET support policy.
Checklists, costs and related languages. The production readiness checklist, the production readiness audit, what custom software costs, and the Java, Python, PHP and Node.js development pages.
Ready to talk? Tell us which .NET or .NET Framework version your system runs on, what it has to integrate with and which of the four shapes you are leaning towards, and we will tell you which parts of the work are known and which are discovery. Talk to our engineers.
Selected Clients’ Success Stories
Driving Collaboration, Code Quality, and Delivery with .NET Engineering
Our .NET developers worked closely with business analysts, project managers, and technical leads to translate complex requirements into well-structured, production-ready code. The team took ownership of backend development, API creation, and quality checks while staying actively involved in client discussions to ensure alignment at every stage. By establishing reusable APIs and clear integration points for UI teams, the overall development process became smoother and more predictable.
Delivering Scalable Enterprise Solutions Using Layered .NET Architecture
For a multinational technology and engineering organization, our .NET web development team built a robust application using ASP.NET, C#, and SQL Server. A layered architecture was implemented to clearly separate business logic, data access, and presentation layers, ensuring long-term scalability and easier maintenance. This approach enabled the client to extend functionality without disrupting existing systems while maintaining consistent performance across modules.
Securing Backend Operations for a Crypto Accounting Platform
We partnered with a modern crypto accounting software firm to strengthen backend operations using .NET and MySQL. The focus was on secure data handling, efficient transaction processing, and reliable record management. By optimizing database interactions and implementing structured backend workflows, the system was able to handle sensitive financial data with greater consistency and control.
