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.NET development company
A .NET development company that builds and modernises software on the Microsoft stack.
Picture the app that quietly runs your business turned into a modern, secure system your team can change without holding its breath. 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.
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 lean on every single day. It is one of the foundations we work in across the wider technology stack, and it is especially well-suited to custom enterprise software and to the bespoke software development work Avaib does most.
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. If you would rather extend your own team, you can also hire .NET developers from us instead.
Building something new on .NET, or stuck with an old one you are afraid to touch? Both are what we do.
Get a free quoteWhat 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.
Enterprise web applications
Picture a web app that holds steady through your busiest traffic and stays easy to change years later. We build secure, high-traffic applications on ASP.NET Core and Blazor that carry real business load, not just make it to launch day.
Business systems and internal tools
Replace the boxed product you fight with and the spreadsheets held together by hand. We build ERP, CRM, portals and line-of-business tools shaped around the exact way your operation already runs.
APIs and microservices
Imagine your systems finally speaking the same language, orders, records and data flowing between them without anyone re-keying it. We connect your stack through well-documented Web APIs and microservices built with gRPC and messaging.
Cloud-native on Azure
See your software scale up on a busy day and settle back down without a scramble. We design applications for Azure from the start, or move existing ones onto it, using App Service, Functions, containers and managed SQL so they stay fast and reliable.
Desktop and cross-platform
Free your team from being tied to one Windows machine. We take a desktop app to the web and mobile without starting over, modernising your WPF and WinForms software or rebuilding it in .NET MAUI and Blazor.
AI features built into .NET
Imagine the intelligence living right inside your product instead of a separate tool your staff have to remember to open. We wire ML.NET, Azure AI and OpenAI or Claude straight into your .NET application.
Not sure which of these fits your project? Tell us what you are building and we will map it out.
Get a free quoteThe 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.
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.
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.
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.
Assess and map the risk
We audit the existing .NET application, its dependencies and where it is exposed, then give you a plain-language picture of what is safe, what is urgent, and what modernising it actually involves.
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.
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.
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.
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
You get engineers who have already solved problems like yours. We have built 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 budget buys people who write .NET every day, never someone learning on your dime. Every build is backed by a dedicated QA department and a 30-day warranty.
Legacy .NET, modernised without the drama
Picture your ageing .NET Framework app becoming a system your team can change with confidence. We move it onto modern .NET in slices, keeping it running the whole time, so you skip the risky big-bang rewrite.
Senior expertise, without the premium price tag
The same capability Australian, US, Canadian and Middle-East firms charge a fortune for, delivered by senior .NET engineers from around USD 25 per hour. One Canadian media and broadcasting company cut its development investment by roughly 75% against local vendor quotes and still received the same high-quality solution, backed by a 30-day warranty.
AI-accelerated delivery
Our senior engineers use advanced AI coding tools to move through the routine parts of the .NET build faster, steering and reviewing every step, so you see working software 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 anywhere, so you are never trapped with us or with 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 quoteProven .NET work
.NET systems we have built and modernised.
Real ASP.NET and C# projects delivered for insurance, membership, renewable energy, construction and scheduling businesses, each still doing its job today.
A warranty portal that put an insurer back in control
Jewelers Mutual was tracking jewelry warranty plans across scattered records with no single view. We built a custom ASP.NET and SQL Server portal with clear role-based access, so every sales record and warranty plan is tracked end to end, with accountability, data security and compliance built in.
ClubRunner's CMS, rebuilt for 5,000+ clubs worldwide
ClubRunner's legacy content system was holding back a platform used by more than 5,000 clubs. We re-architected it on modern Microsoft technologies with reusable, customisable themes and supported the move to Azure, retiring the technical debt and giving members faster, better-looking club websites.
The ERP & CRM behind Grasshopper Energy's solar growth
Grasshopper Energy's operations were siloed and project visibility was thin. We built GEOS, a custom ASP.NET ERP and CRM with a standout tool that calculates rooftop solar capacity from map data, unifying sales, operations and asset tracking behind a project pipeline that grew past $6 billion.
Scaling QuickContractors into a national marketplace
QuickContractors had outgrown its Classic ASP roots just as partnerships with Home Depot and Lowe's took off. We migrated it to ASP.NET and React on Azure, added contractor dashboards, mapping and dispatch automation, and scaled the team from one developer to 50+, a run that ended in acquisition by one of Canada's largest corporations.
Real-time booking that ended the waiting game
Premiere Suite's customers were stuck in phone tag and missed calls just to book a service. We built an ASP.NET and SQL Server scheduling system that lets them book straight into a provider's calendar in real time, removing the coordination delays and lifting booking success rates.
Want a .NET result like these, with the code owned by you?
Get a free quoteHow 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.
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.
Agree a clear, prioritised scope
You get a plain-language 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.
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.
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.
The same capability Australian, US, Canadian and Middle-East firms charge a fortune for, delivered by senior .NET engineers from around USD 25 per hour, at a fraction of the price. We scope the work clearly up front so you get a fixed, plain-language quote, and every engagement leaves you owning your code, data and documentation outright.
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.
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.
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 quoteTell 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 quoteWho 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.
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.
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.
"I have nothing but positive things to say about Avaib. We have dealt with his company as our sole software providers for over 18 years now with very few issues. I would recommend their services anytime."
"As a senior product manager, I have worked with a handful of vendors, consultant agencies and development shops. I am confident to say that Avaib is among the best considering the velocity, quality of the work and the overall ROI. The team took ownership, overcame a steep learning curve in a new industry, and delivered promises. We are very thankful for the dedication of the team and would recommend Avaib to any company, large or small, to help with your technical project."
"We partnered with Avaib for custom software, mobile app, and web design & development projects, and the experience was excellent. All solutions were robust, well-structured, and delivered on time. They added real value to our clients' businesses."
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-language 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 quoteWould rather bring senior .NET engineers into your own team than hand off a whole project? You can hire dedicated .NET developers from us instead.
Hire .NET developers →Explore more
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Learn more →Let's turn your .NET software into something you can build on for years.
Book a free consultation. No jargon, just an honest read on your .NET project or migration and a clear path to get there.
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