.Net Development Services
We help companies modernize legacy .Net systems and build secure, cloud-ready .Net products with strong backend architecture and long-term maintainability.
Custom .Net Development Services for Business
As a custom .Net development company, we cover the full lifecycle, from architecture to long-term maintenance.
Legacy .Net modernization
We move outdated .Net systems toward modern, cloud-ready architecture. Your core keeps running while the architecture improves underneath it.
Modern .Net product development
We build your product with modern .Net: backend architecture, API development, SaaS and B2B platforms, and cloud-native applications. Built for security, performance, and long-term maintenance from day one.
Performance and cloud cost reduction
We speed up slow .Net systems and cut what they cost to run. That covers backend and API performance, database tuning, serverless refactoring, and AWS and Azure hosting improvements.
.Net team augmentation
We add experienced .Net specialists to your existing team: backend engineers, QA automation, DevOps, and cloud specialists. You scale capacity fast, with people who fit your delivery process.
Modernization QA and delivery governance
We protect business-critical workflows during change with QA automation, regression coverage, CI/CD, and controlled rollout. Fewer surprises in production, predictable releases.
Planning a .Net build or modernization?
We'll review your architecture, goals, and constraints, then give you a clear plan with phase estimates before any code is written.
What Our Clients Say
.Net Development Success Stories
Modernizing a FinTech financial planning platform
FinTech
United States
We helped a financial planning platform replace its costly one-server-per-client setup with a modern, multitenant architecture, rebuilt on .Net 6 while keeping its existing components running.
Replaced the one-server-per-client model with a multitenant core engine, cutting infrastructure costs
Added a hybrid tenancy model: shared infrastructure by default, dedicated resources as a premium option
30% faster development and releases after moving to a component-oriented architecture on .Net 6
Building an AI face-matching platform for mass events
Leisure & Entertainment
United States
We built a face-matching platform that lets people find their event photos by uploading a selfie. We proved the deep-learning approach with a proof-of-concept, shipped the product on a .Net backend, then refactored to serverless as it scaled.
50% lower server costs after refactoring the monolith to serverless
100,000+ photos downloaded in a single major event, with 1.5M+ photos stored
The platform has the highest user loyalty rate, since no client has ever stopped using it.
Test automation for an enterprise IT migration product
Software / Enterprise
United States
We built and maintained test automation across UI and API layers for a complex enterprise migration product, with 5,000+ end-to-end scenarios running daily across two product versions and full integration into Jira.
Up to 95% stable pass rate across daily runs
52% shorter automated regression execution time
70% less QA effort, with higher modernization reliability
Modernizing a Windows utility product
Software / Utilities
United States
We modernized a Windows utility that finds and updates outdated PC drivers, moving it from ASP.Net MVC toward a Web API backend with an Angular frontend. We reworked crawlers, parsers, admin tools, database logic, and infrastructure.
50% lower database hosting costs
15x faster response time
100x faster crawler runtime, plus faster feature delivery
Why Choose Techstack as Your .Net Development Company
Here's what you get with us as your .Net software development company.
Experienced .Net Developers
12+ years of .Net across .Net Framework, .Net Core, .Net 6/10, C#, and F#. We rank in the top 1% of US engineering functions. Our engineers work in senior, long-term teams, not rotating contractors.
Architecture Built to Grow
We design backends that hold up as traffic climbs. We've run serverless architecture for 400,000+ daily users and cut server costs 50% on a platform storing millions of photos.
Secure Software Development
We're ISO 27001 and ISO 27701 certified and GDPR-compliant, with delivery experience in healthcare and fintech. Security practices and code review are built into how we work from the first sprint.
Flexible Engagement Models
Hire a dedicated .Net team, extend your own, or run a project squad for a single modernization phase. We bill on Time & Materials, and strong .Net talent availability means we staff fast.
Long-Term Support
60% of our partners work with us for 5+ years, and we maintained backend infrastructure and integrations across the Corel software ecosystem for years.
.Net Application Development Solutions We Provide
Our .Net application development services cover the products companies actually run their operations on. Each .Net software development services below are built on the same engineering foundation.
We build line-of-business .Net applications that handle core operations: workflows, automation, and reporting. Our .Net app development services here cover web apps and .Net desktop application development for Windows utilities, internal tools, and connected workflows.
We build multitenant SaaS products with .Net backends ready for many customers on shared infrastructure. You get a platform that adds tenants and features without architecture debt piling up.
We build and connect CRM and ERP systems, including custom CRM-like tools and integrations with existing software. We've built custom CRM systems inside large software ecosystems where off-the-shelf tools didn't fit.
We build admin panels, B2B portals, and internal tools that give your team control over data and operations. One healthcare portal we built lets clinics update servers remotely from a central admin panel.
We build .Net applications that turn data into something useful: dashboards, analytics, and AI-driven features on top of your existing workflows. On an events platform we built AI face-matching that helped users download more than 100,000 photos during a single major event.
Industries We Serve
FinTech
We modernize and build financial software where stability and data handling matter. We rebuilt a financial planning platform with .Net 6 and a multitenant core engine while keeping its existing .Net Framework parts running.
Healthcare
We build and modernize healthcare software for clinics, including patient-facing mobile apps and clinic portals. Our work has supported offline tablet workflows, remote server updates, and algorithms used in early cancer detection.
Logistics
We build .Net backends and integrations for logistics and supply chain operations: data flows, third-party connections, and real-time processing. We focus on systems that stay reliable as volume grows.
Retail and eCommerce
We build and maintain backend services, payment and ecommerce integrations, and the data systems behind online sales. We focus on systems that stay reliable through high-traffic periods and platform changes.
SaaS
We build multitenant SaaS platforms and the QA discipline behind reliable releases. We've delivered enterprise migration products with thousands of automated test scenarios running daily.
Manufacturing
We build .Net applications and backends for manufacturing operations: internal tools, production data, and integrations with existing systems. We connect older systems to modern interfaces without a disruptive rebuild.
Design systems & component libraries
We build scalable UI frameworks and reusable components, ensuring speed, consistency, and easier development handoff.
Outcome:
Faster development cycle
Design consistency
Reduced tech/design debt
Design systems & component libraries
We build scalable UI frameworks and reusable components, ensuring speed, consistency, and easier development handoff.
Outcome:
Faster development cycle
Design consistency
Reduced tech/design debt
Design systems & component libraries
We build scalable UI frameworks and reusable components, ensuring speed, consistency, and easier development handoff.
Outcome:
Faster development cycle
Design consistency
Reduced tech/design debt
Design systems & component libraries
We build scalable UI frameworks and reusable components, ensuring speed, consistency, and easier development handoff.
Outcome:
Faster development cycle
Design consistency
Reduced tech/design debt
Our .Net Development Process
01
Discovery and Requirements Analysis
We start by mapping your goals, users, and constraints, then turn them into a written scope. You know what we're building and why before work begins.
02
Architecture Planning
We design the architecture, data model, and integration points up front. This is where we decide what to keep, rebuild, or remove on modernization work.
03
UI/UX and Prototyping
We design and prototype the interface so you can react to something real, not a spec. Feedback here is cheap; feedback after build is not.
04
.Net Software Development
We build in short cycles with mature Scrum and high-end CI/CD. You see working software early and often, with product ownership on our side.
05
QA and Testing
We test across UI and API layers with automation where it pays off. On complex migrations this is how we reach high pass rates and protect production.
06
Deployment and Support
We deploy with controlled rollout, then stay for maintenance and growth. Releases stay predictable, and your system keeps evolving after launch.
Request a Free, No-obligation Quote
Kate Nyzhehorodtseva
Business Development Manager
Tell us what you're building or modernizing. We'll map the right .Net specialists and a delivery plan with a clear estimate.
What’s Next?
01
Get a confirmation email within 12 hours
02
Meet with Anton and discuss your team needs
FAQ
What are .Net development services?
.Net development services cover building, modernizing, and maintaining software on Microsoft's .Net platform, using C# or F#.
That ranges from custom web and desktop applications to SaaS platforms, APIs, and cloud backends. A .Net development firm handles architecture, development, QA, deployment, and long-term support.
How do I choose a .Net development company?
Look at proven .Net experience across modern and legacy versions, real case studies with numbers, and how the company runs delivery and QA.
A strong .Net development agency shows product ownership and a long-term partnership track record, not just developers for hire. With Techstack, 60% of partners stay 5+ years, which tells you how the work holds up.
Do you provide legacy .Net application modernization?
Yes. We modernize legacy .Net systems, including .Net Framework to modern .Net migration, ASP.Net MVC and Windows Services updates, and monolith decomposition.
We work in phases so your core keeps running, as we did when rebuilding a fintech platform's core with .Net 6 alongside its existing .Net Framework components.
How much do .Net development services cost?
Cost depends on scope, and we bill on Time & Materials so you pay for work that moves your product forward.
A 2-week diagnostic produces a roadmap with clear phase estimates before development starts. Targeted work on a single component usually runs 4 to 12 weeks; a full modernization for a mid-market company typically runs 6 to 18 months in phased delivery.