Azure App Modernisation
The application earns its place. The infrastructure underneath it shouldn’t be the thing holding you back.
The systems running your business were built for a reason. The rules embedded in them are years of hard-won knowledge. The trouble is rarely the application itself — it’s the platform underneath: ageing servers, brittle integrations, no path to AI, mounting maintenance bills. We modernise the platform onto Microsoft Azure, preserve what’s working, and open the door to everything modern Azure adds — AI, broader data integration, scale, observability, and a foundation your application can grow on.
Application work delivered for organisations including
Where things start to creak
We hear the same set of pressures from technology leaders looking at their application estate. Each one on its own can be lived with for a while. Together, they’re the signal that something has to change — and that the cost of waiting is already being paid.
Hosting, licensing, patching, vendor support, the niche skills required to keep an old framework alive — every year the cost of keeping the application running goes up. None of it is delivering new value to the business. It’s the price of staying still.
Modern platforms speak APIs, OAuth, event-driven patterns, and structured data. Legacy applications often don’t. Every new integration becomes a custom project — and the SaaS tools your business wants to adopt either don’t connect or connect badly.
As data volumes grow, things get slower. Reports time out. Users wait. Throwing more hardware at it buys a year, maybe two. There’s no clear path to a real fix because the architecture wasn’t built for the scale you’re now running at.
You’d like the application to do more — surface insights, automate decisions, summarise content, answer staff questions. None of it is realistic on the current architecture. The data is locked inside it, the platform can’t host modern AI services, and bolt-ons would be expensive and brittle.
Patching takes longer. Audit findings keep recurring. Identity is managed in a custom module rather than Microsoft Entra ID. The platform underneath isn’t aligned with the controls modern frameworks expect, and every year the gap to compliant gets wider, not narrower.
The people who built or maintained the application are retiring or moving on. Documentation is patchy. The number of engineers who understand the framework is shrinking, the day rate to find one is rising, and every change feels riskier than it should.
Our approach
We don’t default to either. We work through your application portfolio with you, identify what’s worth preserving, and choose the modernisation pattern that fits each application’s risk, complexity, and business value. The end state is a platform you can actually grow on — not a museum piece on cloud.
Six modernisation patterns, each with real trade-offs. We pair each application with the one that fits its risk profile, integration footprint, and roadmap — and we explain why. No template-driven approach, no default to the most invasive option.
Azure App Service, Azure Container Apps, AKS, Azure SQL, Azure Functions, API Management, Microsoft Entra ID. We build on the modern Azure platform — not classic deployment models, not third-party overlays. The architecture aligns with Microsoft’s Cloud Adoption Framework from day one.
The modernised application is built to connect to Azure AI Foundry, Azure OpenAI, Microsoft Fabric, and your broader data estate from the start. The architecture assumes you’ll want AI features and richer data integration — even if you don’t switch them on in phase one.
We start with a fixed-fee Application Modernisation Assessment. You leave with a documented portfolio view, a recommended pattern per application, and a sequenced roadmap with realistic timeframes — before you commit to a delivery engagement.
Modernisation patterns
There’s no single right answer to application modernisation. The fit depends on what the app does, how it’s built, what it integrates with, and where you want it to go. Here’s how we think about the choices — and the trade-offs we walk through with you during the Assessment.
Wrap the existing application in a modern API layer so other systems can integrate with it cleanly. The application itself stays where it is. Useful when the legacy code is stable but isolated, and the immediate need is connectivity rather than a platform change.
Lift and shift the workload from on-premises onto Azure with minimal code change — typically Azure Virtual Machines or Azure SQL Managed Instance. Fastest path off ageing hardware, often the right first step before deeper modernisation in later phases.
Move the workload to managed Azure PaaS services — Azure App Service, Azure SQL Database, Azure Container Apps — with targeted code adjustments. You keep most of the application as is, but operations get materially simpler and the cost profile shifts in your favour.
Restructure the code without changing what the application does on the outside. Removes accumulated technical debt, improves performance, and prepares the codebase for ongoing development. Suited to applications where the functionality is right but the internals have become hard to maintain.
Reshape the application around modern patterns — microservices, containerisation, API-first design, event-driven workflows. The right choice when scalability, resilience, or AI and data integration are the destination, and the existing monolithic architecture is the constraint.
Build the application again from the ground up on cloud-native Azure. The most invasive option, reserved for cases where the legacy codebase genuinely can’t carry the business forward and starting fresh is more economical than continued patching. We’re upfront about when this is — and isn’t — the right call.
A note on Replace. Replacing the legacy application with a packaged SaaS product is sometimes the right answer — but it’s a different conversation. If a credible product fits your requirements better than modernisation will, we’ll say so during the Assessment. Modernisation is for the applications worth keeping.
Built on modern Azure
Once an application is on modern Azure PaaS, the conversation changes. Instead of arguing about whether you can afford to keep it running, you start asking what else it could do. These are the capabilities the new platform brings — most of which weren’t even an option on the old one.
Native connection to Azure AI Foundry, Azure OpenAI, and Semantic Kernel. The modernised application can summarise, classify, recommend, route, and answer questions using your own data — and you can add those capabilities incrementally rather than as a separate AI project later.
The modernised application sits alongside Microsoft Fabric, Azure SQL, and Power BI. Data flows in and out cleanly — you can join application data with finance, HR, or operational data sources, surface insights inside the app, and make decisions from a single, governed view.
Azure PaaS scales horizontally as load changes — peak EOFY, peak enrolments, peak campaign weeks. The application no longer needs to be sized for the busiest day of the year, and you stop paying for headroom you only use twice a year.
Azure Application Insights and Log Analytics give you live telemetry on performance, errors, and user behaviour — the kind of visibility legacy applications rarely had at all. Issues are caught in development, not in a midnight call from the help desk.
Microsoft Entra ID for identity. Microsoft Purview for governance. Azure Key Vault for secrets. Defender for Cloud for posture management. The application sits inside a security model your audit and compliance teams already know, with controls applied centrally rather than reinvented per app.
A modernised application on Azure plugs cleanly into Microsoft Teams, SharePoint, Microsoft Graph, and Power Platform — without third-party connectors. The app becomes part of how your people already work, rather than another portal they have to remember to open.
How the engagement runs
Modernisation programmes get into trouble when the first decision is the biggest one. We sequence the work so the heavy commitments happen after the analysis, not before — and so you have something working in production while later phases are still being scoped.
We work through your application portfolio with you. Each application is reviewed for technical condition, integration footprint, business value, and risk. The output is a recommended modernisation pattern per application and a sequenced roadmap — concrete enough to plan from.
We design the target Azure architecture for the first application — landing zone, identity, networking, data, observability — aligned to Microsoft’s Cloud Adoption Framework. Infrastructure as Code (Bicep or Terraform), CI/CD pipelines, and security guardrails are set up so later applications inherit the same foundation.
Delivery happens in fortnightly sprints with a working application in production at the end. Cutover is staged and reversible. We keep the legacy application running until the modernised version has been validated — no hard switches, no surprise outages.
Once the application is live, our managed service takes over the ongoing work — performance monitoring, security patching, capability development, AI feature rollout, and quarterly roadmap reviews. The application keeps growing with the business rather than going back into stasis.
An Application Modernisation Assessment is a fixed-fee engagement that looks at your current application portfolio, identifies the right modernisation pattern for each, and produces a sequenced roadmap. You leave with a clear plan — not a sales proposal.
No obligation. No pressure. An honest conversation about what your application portfolio actually needs.In production
A few examples of applications we’ve taken from ageing platforms onto modern Azure — preserving what already worked and adding what wasn’t possible before.
A custom, modern, user-centric standards platform
Standards Australia’s legacy publication platform was rebuilt as a modern, user-centric Azure application — improving productivity, speed, and the customer experience for organisations consuming Australian standards.
Read the case study →Modernising the school timetable sync
A core school timetable integration was modernised onto Azure PaaS — replacing brittle scheduled jobs with event-driven Azure Functions, and surfacing live timetable data into Microsoft Teams and SharePoint where teachers and students already work.
Read the case study →Legacy member portal to modern Azure
An on-premises member portal serving thousands of users was replatformed onto Azure App Service, Azure SQL Database, and Microsoft Entra ID — reducing operating cost, improving performance, and laying the groundwork for AI-assisted member self-service in later phases.
More case studies →Sectors we work with
The mechanics of modernisation are similar across sectors — but the compliance, data sensitivity, and user requirements aren’t. Our consultants bring genuine sector experience to each engagement, which means we ask the right questions early and don’t surprise you in audit.
Why Antares
There is no shortage of partners willing to talk about modernisation strategy. The distinction in practice is whether the work has actually been delivered — and whether the partner is still around when something needs to change a year later.
Twenty years of Microsoft partnership, multiple Specialisations across six Solution Partner areas, and three practice areas built entirely on the Microsoft Cloud. We go deep on Azure, Microsoft 365, and Fabric — not broad across every cloud and platform on the market.
Modernisation work delivered for Standards Australia, NRMA, UNSW, Mission Australia, Haileybury College, and Newington College. Production deployments handling real workloads — not pilots running in a sandbox.
We build on first-party Microsoft Azure services — App Service, Container Apps, AKS, Azure SQL, Azure AI Foundry, Microsoft Entra ID. No third-party platforms layered on top. That means fewer moving parts, fewer licences, and a platform your team can actually own.
Every engagement starts with a fixed-fee Modernisation Assessment. You leave with a portfolio view, a recommended pattern per application, and a sequenced roadmap before you commit to a delivery engagement — so the first big decision is made on evidence, not on hope.
Most application modernisation conversations end at “the app runs on Azure.” Ours don’t. We design the modernised application to integrate with your Microsoft 365, Microsoft Fabric, and AI investments natively — because that’s where the business case for modernisation actually lives.
Modernised applications need ongoing work — performance tuning, security uplift, AI features, new integrations. Our Managed Application Service runs in fortnightly sprints with a dedicated Technical Lead, monthly roadmap reviews, and active monitoring. The relationship doesn’t end at cutover.
Frequently asked questions
