๐ŸŒ Australia ยท United States ยท Canada ยท Middle East
Code on a dark screen โ€” .NET development at Avaib

Home/Technologies/Microsoft / .NET

.NET development company

A .NET development company that builds and modernises software on the Microsoft stack.

Avaib is a .NET development company with more than twenty years on the Microsoft stack, building secure C#, ASP.NET Core, Blazor and Azure software, and bringing ageing .NET Framework apps up to date without a risky rewrite. Senior specialists, code you own, at a cost-effective rate.

Delivered for teams in Australia, the United States, Canada and the Middle East.

20+
Years on the Microsoft stack
600+
Projects delivered
C#
Senior specialists only
Yours
You own the code outright

Built on Microsoft, built to last

Serious business software, on a foundation you can maintain for years.

.NET is Microsoft's platform for building software, usually in C#, and it powers a huge share of the secure, high-load business systems that companies rely on every day โ€” one of the foundations we work in across the wider technology stack.

The trouble is what happens over time. Plenty of businesses are running an older .NET Framework app that quietly does something important, but it is out of support, hard to change, and the people who built it have moved on. Touching it feels risky, so it gets left, and the security and hosting risks quietly build up until the day something has to change.

That is exactly where Avaib fits. We build new .NET software properly, and we modernise ageing .NET apps in slices while they keep running, so you get a current, supported codebase you own, without a business-stopping rewrite and without junior developers learning on your budget.

A team of .NET developers building enterprise software in the office

Building something new on .NET, or stuck with an old one you are afraid to touch? Both are what we do.

Get a free quote

What we build with .NET

Enterprise software across the whole Microsoft stack.

From high-traffic web apps to internal systems, APIs, cloud services and AI features, here is the range of .NET software our senior specialists build and maintain.

An enterprise software developer building on .NET โ€” .NET development at Avaib โ€” Avaib

Enterprise web applications

Secure, high-traffic web apps on ASP.NET Core and Blazor, built to handle real business load and to be maintained for years, not just launched once.

A web application being built in code on screen โ€” Avaib โ€” Avaib

Business systems and internal tools

ERP, CRM, portals, admin and line-of-business tools that run your operation, tightened around your actual workflow instead of a boxed product you fight with.

A developer working on an API and database โ€” Avaib โ€” Avaib

APIs and microservices

Well-documented Web APIs and microservices with gRPC and messaging, so your .NET systems talk cleanly to each other and to the rest of your stack.

An engineer building a cloud application on a laptop โ€” Avaib โ€” Avaib

Cloud-native on Azure

Applications designed for Azure from the start, or moved onto it, using App Service, Functions, containers and managed SQL so they scale and stay reliable.

A desktop business application on a monitor โ€” Avaib โ€” Avaib

Desktop and cross-platform

WPF and WinForms modernised, or rebuilt in .NET MAUI and Blazor, so a Windows-only desktop app can reach the web and mobile without starting from scratch.

A team modernising legacy software together โ€” Avaib โ€” Avaib

AI features built into .NET

Machine learning with ML.NET, and OpenAI, Claude and Azure AI wired into your .NET application, so the intelligence lives inside the product rather than in a separate tool.

Not sure which of these fits your project? Tell us what you are building and we will map it out.

Get a free quote

The legacy .NET trap

Why an old .NET app quietly becomes a liability.

This is the most common .NET situation we are called in to fix. It is nobody's fault; it is just how an ageing codebase drifts, and everything about how we work is built to get you out of it safely.

01

It works, so nobody touches it

A .NET Framework app quietly runs the business. It is out of support, hard to change and the people who built it have moved on, so every change feels risky and gets deferred.

02

The risk builds up out of sight

Old frameworks stop getting security patches, get slower to host, and drift further from modern .NET. The danger is not visible at launch; it shows up as a breach, an outage, or a change you suddenly cannot make.

03

A big-bang rewrite feels like the only option

By the time it has to change, the codebase looks like an all-or-nothing rebuild, which is expensive, slow and risky, so it keeps getting put off and the problem compounds.

An out-of-support .NET Framework app rarely fails at launch. The cost shows up later, in a security breach, an outage, or the change you suddenly cannot make, which is exactly why it pays to modernise before you are forced to.

Modernising without the big bang

From legacy .NET Framework to modern .NET, in provable steps.

A big-bang rewrite is expensive and risky, so we do not do one. We move your app onto current .NET slice by slice, keeping it running the whole way through.

Step 1

Assess and map the risk

We audit the existing .NET application, its dependencies and where it is exposed, then give you a plain-English picture of what is safe, what is urgent, and what modernising it actually involves.

Step 2

Move to modern .NET in slices

Rather than a risky big-bang rewrite, we migrate module by module onto modern .NET, keeping the app running the whole time so the business never stops while the foundation is replaced underneath it.

Step 3

Cut the Windows-only ties

We untangle the System.Web, IIS and Windows-service dependencies that lock the app to old infrastructure, so it can run cross-platform and in the cloud, not just on a legacy server.

Step 4

Harden, test and hand over

Our QA department tests each slice, we tighten security and performance, and you get the code, the documentation and a modern .NET codebase your team can hire for and extend.

The concerns, answered

What worries people about a .NET project, and how we handle it.

These are the real concerns we hear before a .NET build or migration starts. Here is exactly how Avaib takes each one off the table.

"We are stuck on old .NET Framework and scared to touch it."
We modernise in slices with the app running the whole time, so there is no big-bang rewrite and no business-stopping outage. You see a working, tested system after every step, not a year of silence and a risky switch at the end.
"They will bill senior rates and put juniors on our code."
Your .NET project is staffed by senior C# and ASP.NET specialists who work in the stack every day. You are never funding someone learning the framework on your budget, and one accountable team owns the work start to finish.
"We will be locked into the vendor or into Azure."
You own the code, the data and the documentation on standard, well-supported .NET, so any capable team can run it. We build for the cloud you choose and avoid tying you to services you cannot leave.
"An outsourced team will not understand our enterprise setup."
We have built secure, regulated, high-load .NET systems since 2004. We work with your existing databases, authentication and infrastructure, and design to the security and compliance bar your environment actually requires.
"Modernising will cost a fortune and overrun."
We scope the work clearly up front and give you a fixed, plain-English quote. Senior engineers work at a cost-effective rate of around USD 25 per hour, and AI-accelerated delivery moves through the routine work faster, so you get there sooner.
"After launch, the team will vanish."
Every build is backed by a 30-day warranty and optional ongoing support, with urgent requests picked up quickly. The relationship continues because it keeps delivering value, not because you are trapped in it.

Why Avaib

Why choose Avaib as your .NET development company.

Plenty of teams can write C#. Fewer pair two decades on the Microsoft stack with senior-only staffing, safe legacy modernisation and a price that does not punish you for it.

20+ years on the Microsoft stack

Building C#, ASP.NET and .NET software since 2004, across more than 600 projects, from enterprise web systems to APIs, desktop apps and cloud platforms.

Senior C# and .NET specialists only

Your project is built by engineers who work in .NET every day, backed by a dedicated QA department and a 30-day warranty, with no juniors learning on your budget.

Legacy .NET, modernised without the drama

We move ageing .NET Framework apps onto modern .NET in slices, keeping them running, so you get a maintainable codebase without a risky big-bang rewrite.

Cost-effective senior expertise

Senior .NET engineers from around USD 25 per hour, the same capability Australian, US, Canadian and Middle-East firms charge a fortune for, at a fraction of the price.

AI-accelerated delivery

Our senior engineers use advanced AI coding tools to move through the .NET build faster, steering and reviewing every step, so your software ships sooner without cutting corners on quality.

You own the code and the stack

The code, the data and the documentation stay yours, on standard, well-supported .NET you can hire for, so there is no lock-in to us or to a niche technology.

Want a senior .NET team that builds it right and hands you the code, without the enterprise price tag?

Get a free quote

How we work

From first conversation to .NET software that runs.

Understand your systems first, agree a clear scope, build or migrate in provable slices, then launch and support, so you always see progress and never face a single risky switch.

01

Understand the software and your systems

We start with what your .NET software has to do, who uses it and what it connects to, including any existing app, database or Windows infrastructure, so the plan is grounded in your real situation.

02

Agree a clear, prioritised scope

You get a plain-English scope with defined outcomes, so you know exactly what will be built or modernised, in what order, and what it will cost before any development begins.

03

Build or migrate in provable slices

Senior .NET specialists work in slices, each tested by our QA department, so you see working software early and, for a migration, the app keeps running the whole way through.

04

Launch, support and evolve

We help you roll it out on the cloud or servers you choose, support it under a 30-day warranty and beyond, and extend it as your needs change, on a foundation built to last.

Pricing

Enterprise-grade .NET, without the enterprise price tag.

Senior .NET engineers from around USD 25 per hour, the same capability Australian, US, Canadian and Middle-East firms charge a fortune for, at a fraction of the price. We scope the work clearly up front so you get a fixed, plain-English quote, and every engagement leaves you owning your code, data and documentation outright.

Best for a defined build

Fixed-scope .NET project

For a clearly scoped .NET application or module, we agree the scope and the price up front, then deliver and test it against your real requirements.

Best for ongoing work

Dedicated .NET team

A senior C# and ASP.NET team working as an extension of yours, that you can scale up or down as priorities shift, without hiring and training in-house.

Best for an ageing app

Legacy modernisation engagement

We move an existing .NET Framework application onto modern .NET in slices, keeping it running throughout, on a plan sized to your risk and budget.

Every project is delivered by senior C# and ASP.NET specialists under one accountable team, tested by a dedicated QA department, backed by a 30-day warranty, and you keep the code, data and documentation with no lock-in. Not sure where to start? We will give you an honest recommendation on a free scoping call and send you a free, no-obligation written estimate with a clear scope.

Want a clear read on your .NET project and what it should cost?

Get a free quote

Tell us about your .NET project and we will map out the build.

Whether it is a new .NET application or an ageing one to modernise, get an honest read, a clear scope and a ballpark price, free and with no obligation.

Get a free quote

Who we help

.NET expertise for teams building something that has to last.

If you are building on .NET, running an ageing .NET app, or standardised on Microsoft and Azure, here is the kind of team Avaib fits, and the problem we usually solve for each.

Businesses running an ageing .NET Framework appIt still works but it is out of support and hard to change. We modernise it onto current .NET in slices, without stopping the business.
Enterprises needing secure, high-load systemsYou need software that stands up to real traffic, real security and real compliance. We have built exactly that on .NET since 2004.
Teams on Microsoft and AzureYour world is already C#, SQL Server and Azure. We fit straight into it and build software that talks cleanly to what you run.
Founders who chose .NET for the long termYou want a mainstream, well-supported foundation you can hire for. We build it properly and hand you code you own outright.
Companies burned by a junior-heavy vendorLast time you paid senior rates for junior work. This time senior .NET specialists build it, under one accountable team.
Products that need AI inside a .NET appYou want machine learning or an LLM built into your existing .NET software. We wire it in with ML.NET, Azure AI and OpenAI or Claude.

The .NET toolbox

The Microsoft-stack languages, frameworks and tools we work in.

Deep in C# and the modern .NET ecosystem, and fluent with the databases, cloud services and AI tooling that surround it, so your software fits cleanly with what you already run.

C#ASP.NET CoreBlazor.NET MAUIEntity Framework CoreWeb APIgRPCSignalRDapperWPFWinFormsAzure App ServiceAzure FunctionsSQL ServerPostgreSQLDocker & KubernetesRedisRabbitMQxUnit / NUnitML.NETAzure AIOpenAI & ClaudeCI / CD pipelines

In our clients' words

Relationships that last years, not projects.

Rated 4.5/5 on Google and 5/5 across other platforms, with 10+ written references and 80%+ client retention.

โ˜…โ˜…โ˜…โ˜…โ˜…

"We have dealt with Avaib as our sole software provider for over 9 years now with very few issues. I would recommend their services anytime."

Trevor B.
Canada
โ˜…โ˜…โ˜…โ˜…โ˜…

"Avaib understood our needs and have been catering customised solutions that have exceeded our expectations."

Ethan Johnson
Canada
โ˜…โ˜…โ˜…โ˜…โ˜…

"Round-the-clock availability of business managers and IT teams is one of Avaib's greatest assets. They have always surpassed my expectations. I highly recommend Avaib to everyone."

Zeeshan Mirza
CEO, RemoteFace

Common questions

.NET development, answered.

What is .NET development?

.NET development is the building of software on Microsoft's .NET platform, most often using the C# language with frameworks like ASP.NET Core for web applications and APIs, Blazor for interactive interfaces, and .NET MAUI for cross-platform desktop and mobile apps. Modern .NET is open-source and runs on Windows, Linux and macOS, and it is widely used for secure, high-performance business systems, enterprise web apps and cloud services on Azure.

A .NET development company designs, builds, tests and maintains this software for you, and often modernises older .NET Framework applications onto current .NET. Avaib has worked on the Microsoft stack since 2004, across more than 600 projects, so we can build new .NET software or bring an ageing one up to date.

Can you migrate our old .NET Framework application to modern .NET?

Yes, and we do it without a risky big-bang rewrite. We start by auditing the existing app, its dependencies and where it is exposed, then migrate it onto modern .NET module by module, keeping it running the whole time so the business never stops.

Along the way we untangle the Windows-only ties, such as System.Web, IIS and Windows-service dependencies, that lock old apps to legacy infrastructure, so the modernised software can run cross-platform and in the cloud. You end up with a maintainable, supported codebase you own, not another version you are afraid to touch.

How much does .NET development cost?

It depends on the scope, since a focused internal tool is very different from a system that runs your whole operation or a full legacy migration. That is why we scope the work clearly up front and give you a fixed, plain-English quote before any development starts, so there are no open-ended surprises.

Our senior .NET engineers work at a cost-effective rate of around USD 25 per hour, the same capability Australian, US, Canadian and Middle-East firms charge a fortune for, and AI-accelerated delivery helps get you there faster. After a short conversation we will send you a free, no-obligation written estimate with a clear scope.

Do you build on Azure, and will we be locked into it?

We build cloud-native .NET on Azure using App Service, Functions, containers and managed SQL, and we can move an existing app onto it. Azure and .NET fit together well, so if your world is already Microsoft, we slot straight in.

You will not be locked in, though. We favour standard, portable .NET and keep cloud-specific pieces cleanly separated, so your software can move to another cloud or run on your own servers if you choose. You own the code and the infrastructure decisions, not us.

Is .NET a good choice for a secure, enterprise-grade system?

.NET is one of the most trusted foundations for secure, high-load business software, which is why it is common in finance, healthcare, government and other regulated sectors. It has mature security tooling, strong performance and long-term support from Microsoft.

We have built exactly this kind of system since 2004, designing to the security and compliance bar your environment requires, working with your existing authentication and infrastructure, and testing every slice through our dedicated QA department.

Do you provide dedicated .NET developers or a fixed-price build?

Both. If your project is clearly defined, we scope it and deliver it for a fixed price. If you need ongoing capacity, we provide a dedicated team of senior .NET specialists who work as an extension of yours and scale up or down as your priorities change.

For an ageing application, we also offer a legacy modernisation engagement that migrates it onto modern .NET in slices, sized to your risk and budget. Whichever model fits, the work is done by senior specialists under one accountable team.

How long does a .NET project take?

It depends on the scope, so we do not quote a fixed timeframe until we understand what you need. A focused tool or a first slice of a migration lands quickly; a large enterprise system is planned in stages so you see working software early rather than waiting until the end.

Because we build and migrate in provable slices, and use AI-accelerated delivery to move through the routine work faster, you get value sooner and can see progress the whole way through rather than at a single risky launch.

Got a question that isn't here? Ask it on the quote form, we answer every one.

Get a free quote

Let's build it on .NET, and build it to last.

Book a free consultation. No jargon, just an honest read on your .NET project or migration and a clear path to get there.

Get a free quote