Custom App Development Services
When off-the-shelf doesn’t fit, we build something that does.
You’ve evaluated the platforms. You’ve sized up the SaaS options. The gap between what those products do and what your business actually needs is too wide to bridge with workarounds. Antares is a Microsoft-specialist custom web application development company building bespoke business applications on Microsoft Azure, Power Platform, and SharePoint — designed for the way your organisation operates, not the way a vendor assumes you should.
Custom applications in production across Australian organisations
When the SaaS shortlist runs out
Most software problems are best solved by a product someone has already built. We’ll tell you when that’s the case. But there’s a recognisable point in many businesses where off-the-shelf stops working — where the workarounds, spreadsheets, and integration glue start costing more than the original software. These are the patterns we see most often.
Your business does something specific that no commercial product was designed for. You’ve seen the closest fits, and each one would force you to change shape to suit the software. The workarounds eat the value the product was meant to deliver.
The data exists. The systems exist. What’s missing is the application that connects them — pulling from your CRM, your finance system, your case management platform — and presenting one clean view to the people who need it. No vendor sells that, because nobody else has your exact stack.
Sensitive records, regulated information, or commercial data that your governance policy says must stay inside your environment. SaaS products handle data sovereignty differently — sometimes well, sometimes not. A custom application on your own Azure tenancy puts that question to bed.
A critical process runs through a chain of Excel files, manual emails, and unwritten rules. It works — until someone leaves, or the volume grows, or auditors arrive. A purpose-built application captures the process properly, with auditability, version control, and access management.
A legacy application is doing a real job. The business depends on it. But it’s getting harder to maintain, harder to extend, and the people who built it have moved on. Modernising it onto Azure preserves the business logic and removes the dependency.
Per-seat, per-record, per-transaction pricing made sense at 50 users. At 5,000, the maths changes. When licence renewals start dwarfing the cost of building something purpose-fit, custom development moves from indulgence to obvious decision.
What we build
Bespoke web apps built on Azure App Service, Azure SQL, and Azure Functions. The right choice when the application is customer-facing, has complex business logic, or needs custom user experience and performance characteristics that low-code can’t deliver.
Power Apps, Power Automate, and Power Pages for business applications that need to be delivered fast and maintained by people inside the business. Approvals, data capture, line-of-business workflows. The right tool for the right job — not every problem needs custom code.
Custom apps with AI built in — using Azure AI Foundry, Microsoft Copilot Studio, or our own QBot platform. Document processing, conversational interfaces, intelligent search, agentic workflows. AI as a feature of the application, not a separate tool people have to remember to use.
Connect the systems you already have. Custom APIs, integration middleware, and event-driven architectures that move data between your CRM, ERP, finance, HR, and operational systems — reliably, securely, and with the auditability your governance team needs.
Document-centric applications, controlled document solutions, and intranet-integrated tools built on SharePoint and Microsoft 365. The right pattern when the application’s centre of gravity is documents, content, and the way your people already work.
Legacy applications re-platformed onto Azure. We preserve the business logic that took years to build, replace the parts that have aged out, and bring the application onto a stack you can maintain and extend for the next decade.
The system has brought us data integrity, a single source of truth for all data elements, and integration with our catalogue system. Now everything is integrated and we can see it directly and ensure all data is correct. It’s a major enhancement to the way we do things.
How we deliver
Custom development goes wrong in predictable ways: vague scope, drifting requirements, no version of the software in users’ hands until the very end. We’ve structured our engagement to take those risks out — small, sequenced steps with something working at the end of each one.
We map the problem, the users, the integration points, and the data. You leave with a scoped build plan, an architecture, and a fixed quote for the next phase. No open-ended commitments before the work is understood.
A working prototype in users’ hands quickly — not a wireframe deck, not a slideware demo. Real screens, real data flow, real questions answered. The prototype is where we de-risk the design before the full build starts.
Built in fortnightly sprints, deployed continuously to your Azure environment. You see progress every two weeks. We ship the first usable version of the application early and grow it from there — not the other way around.
A managed service after go-live: dedicated Technical Lead, fortnightly enhancement sprints, monthly roadmap reviews, active monitoring. The application stays current as your business changes — not frozen at the version you launched with.
Sectors we work with
Custom application development is not sector-specific — the underlying disciplines of scoping, architecture, integration, and managed delivery hold across industries. What changes is the compliance posture, the data model, and the user audience. These are the sectors we know best.
Why Antares
There is no shortage of development shops. The questions worth asking are: do they know your platform deeply, do they have applications running in production at organisations like yours, and will they still be involved a year after the launch.
With over 20 years of Microsoft partnership and 4 Specialisations across 3 Solution Partner areas, Antares builds directly on Azure, Power Platform, SharePoint, and Microsoft 365. No proprietary middleware, no third-party platforms wedged in between. The application you receive is yours, running on the stack you already own.
After go-live, most clients move to a managed application service: a dedicated Technical Lead who knows your platform, fortnightly enhancement sprints, monthly roadmap reviews, and active performance monitoring. The application keeps evolving with the business — not frozen at the launch version.
Sometimes the right answer is to buy, not build. If a SaaS product genuinely covers your requirement, we’ll say so during the Discovery Workshop — and help you plan the implementation rather than charge for a custom build that doesn’t need to exist. That’s how the workshop is structured: scoped honestly, before quoted.
Frequently Asked Questions
Custom application development makes sense when an off-the-shelf product would force your business to change shape to fit the software, when no commercial product addresses your specific workflow, when integration between your existing systems is the actual problem, or when the cost of licensing a SaaS product at scale outweighs the cost of building something purpose-fit. If a SaaS platform genuinely covers what you need, we will tell you. The Discovery Workshop is structured to answer this question honestly before anything is built.
Most Australian organisations we work with already run their identity, productivity, and data on Microsoft 365 and Azure. Building custom applications natively on the same platform means access controls (Microsoft Entra ID), data residency, and integration are part of the architecture from day one rather than added through third-party connectors. Antares is a Microsoft Specialist Systems Integrator with over 20 years of Microsoft partnership and 4 Specialisations across 3 Solution Partner areas — the depth on the platform translates directly into how applications are built and supported.
Power Platform is the right choice for many internal business applications — workflow approvals, data capture, simple line-of-business apps, and process automation. It delivers value quickly and is maintainable by people inside the business. Custom Azure web application development is the right choice when the application is customer-facing, has complex business logic, requires deep integration with non-Microsoft systems, needs custom user experience, or has performance and scale requirements that low-code platforms cannot meet. Many of the applications we deliver combine both — Power Platform for the internal-facing workflow, custom Azure code for the parts that need it.
Most first releases are in production within weeks rather than quarters. The Discovery Workshop typically runs over two to three weeks and produces a scoped build plan with a fixed quote. Build phases are delivered in two-week sprints, with a working application in users’ hands within the first one to three sprints depending on complexity. We scope before quoting, so the timeframe is committed up front rather than estimated as you go.
Antares provides custom app development services across the full delivery lifecycle: Discovery Workshops, application architecture and design, custom Azure web application development, Power Platform low-code application development (Power Apps, Power Automate, Power Pages), AI-enabled application development using Azure AI Foundry and Microsoft Copilot Studio, system integration and API development, SharePoint-based business applications, application modernisation and re-platforming of legacy systems, and ongoing managed application services. As a Microsoft Specialist Systems Integrator, our named clients include State Library of NSW, NRMA Insurance, UNSW Sydney, Mission Australia, and Haileybury College.
Yes. Most custom applications we build exist specifically to connect existing systems — pulling data from your CRM, your ERP, your SharePoint document libraries, your case management platform, or your line-of-business systems. Integration is treated as a first-class architectural concern, not an afterthought. Authentication is handled through Microsoft Entra ID so users sign in with the same credentials they use everywhere else. Data flows are designed, documented, and monitored.
Most clients move into a managed application service after go-live. That involves a dedicated Technical Lead, fortnightly sprints for enhancement work, monthly roadmap reviews, active monitoring of performance and incidents, and ongoing capability development as the business changes. The application is treated as a living system, not a project that closes when the first version ships. You can also choose to take the application in-house and run it yourself — the code, the architecture, and the documentation are yours.
Yes. The code, the deployment artefacts, the documentation, and the architecture are all yours. The application runs in your Azure tenancy, on your infrastructure, with your governance applied. There is no proprietary platform you become dependent on — just custom application code on the Microsoft stack you already own.
Start with a Discovery Workshop
Tell us a bit about what you’re trying to do. A Discovery Workshop is a fixed-fee, scoped engagement that produces a build plan and a quote — before you commit to anything. It’s the lowest-risk way to find out whether custom development is the right answer for your situation.
No obligation. No sales pitch. An honest conversation about whether custom is the right path for you.
