Migrate Application to Azure
Corsac has got an architecture-first planning, secure modernization, and predictable execution to help you migrate web applications to Azure without issues.
Our team removes on-prem bottlenecks, cuts run costs, and delivers a scalable, compliant Azure setup your team can maintain long-term.
AWS Certified Cloud Practitioner
PCI DSS Compliance
HIPAA Compliant
Azure Solution Architect Expert
SOC 2 Type II Certification
GDPR certification
Azure Administrator Associate
Azure Developer Associate
Azure Fundamentals
Your on-prem or IIS hosting is expensive to maintain and hard to secure.
Your releases are slow because the architecture is tightly coupled and brittle to change.
Your team depends on a few developers who carry undocumented logic in their heads.
Your platform’s fragile hosting and legacy servers cause unexpected outages.
Your system cannot scale cleanly when usage spikes or the business expands.
For 17+ years, Corsac has delivered complex modernization projects. Our app migration to Azure reduced release risks, stabilized performance, and lowered infrastructure overhead for our clients.
Reduced hotfix release time by
70%Achieved backlog visibility of
100%
Reduced device setup time
60%Reduced memory use
38%
When an Azure project runs late, it’s often because of something nobody inventoried, like a COM component on one server or a scheduled task feeding the billing report. So every app migration to Azure we run starts by reading the code.
On App Service, a restart logs users out, and uploads fail once the app runs from a package. This hits older web apps (Classic ASP, early PHP, Java on an old Tomcat) that keep sessions in process memory and save uploads in the app folder. When we migrate web app to Azure, sessions go to Azure Managed Redis and files to Blob Storage.
A .NET Framework 4.8 app often moves to App Service almost unchanged if it avoids the GAC, COM and Windows Authentication. Leaving .NET Framework is harder, since Web Forms has no modern equivalent. We usually go straight to .NET 10 LTS, supported until November 2028, and port WCF to CoreWCF or gRPC.
An ERP is rarely a single app. Its database goes to Azure SQL Managed Instance, where SQL Agent jobs still run, and SSIS moves to the Azure-SSIS Integration Runtime. The risk is the integration only one developer can restart, so we write these flows into runbooks your team keeps.
If a small pricing fix means redeploying the whole system, changes pile up for one big release that keeps slipping. We’d rather move the monolith to Azure in one piece and put Azure API Management in front. Modules then come out one at a time with the strangler fig pattern, each on its own schedule.
A Delphi, VB6 or PowerBuilder client sends dozens of small queries per screen. On a local network nobody notices. Move the database to Azure, and each round trip crosses the WAN, so users wait on every form. We run the client next to the database in Azure Virtual Desktop or add an API layer between them, a first modernization step.
Some apps can’t leave Windows because they run as Windows services, read the registry or call COM components. Managed Instance on Azure App Service (Premium v4 plans) runs many of them as PaaS and takes server patching off your team. The audit decides between it, Windows containers and VMs.
Web application migration to Azure replaces fragile on-prem hosting with scalable and observable cloud.
Cut infrastructure costs by swapping hardware and manual ops for managed Azure PaaS.
Improve uptime by running on resilient cloud setups with tested disaster recovery.
Prove compliance with Azure audit logs, policies, encryption, and tight access control.
Ship faster using CI/CD, smaller services, and staged rollouts.
Reduce team load by removing server care.
Gain transparency into costs and system health.
Replace tightly coupled modules with modular cloud-ready services and clear APIs.
Use identity-driven access, encryption, and Azure monitoring.
Move databases to managed Azure with autoscaling and backups.
Modernize delivery with CI/CD pipelines and tests safely.
Support hybrid coexistence with VPNs and staged cutovers.
Add observability via logs, traces, metrics dashboards and monitoring.
Let us help you rebuild what’s holding you back.
Azure app migration with Corsac is a controlled, reversible move from on-prem/IIS/.NET to Azure, with parallel run, real performance gains, lower infra cost, and compliant, predictable releases Azure app migration.
We aren’t a full-stack agency. We’ve built our team, processes, and tech strategy specifically to tackle legacy issues and help mid-market players scale and innovate.
We integrate with your workflows, minimizing interference with your developers. While utilizing your Git, CI/CD, and tools, we operate independently, letting your team focus on their work.
Your aging system drains your business resources through slow hiring, security gaps, and delayed launches. We reduce these “dark tech debt” losses before they impact your revenue.
We remove legacy barriers preparing your systems for advanced tech. You can embrace new tools with the future-ready and ROI-driven architecture.
Modernization efforts will be ineffective if the core issue is institutional rigidity. We reveal hidden limits and help grow with flexibility.
We treat your system efficiently: evolve the functioning parts and replace only the ones that require change.
An app leaving your data center and one leaving AWS or Google Cloud break in different places. The first assumes a fixed network and a local domain controller, the second relies on managed services Azure configures differently. Before any Azure application migration, we list what the old platform does quietly, like TLS termination or cron jobs, and find its Azure replacement.
Much of what keeps an on-prem app running sits outside its code: a firewall rule from 2015, a share mapped as Z:, an IP address in a config file. Azure Migrate shows which servers talk to each other, and we read the configs for the rest. Both environments stay connected over VPN or ExpressRoute until the Azure version passes the same tests.
IAM roles take the most thought in an AWS exit, as Azure splits that job between managed identities and RBAC. EC2, Lambda and RDS have clear counterparts in Azure VMs, Functions and managed databases. CloudFormation becomes Bicep or Terraform, and we time the data transfer to the 180 days AWS gives approved exits without egress fees.
GKE workloads move to AKS with few changes, since both run Kubernetes. Cloud Run and Pub/Sub are where we slow down: a consumer relying on ordering keys needs Service Bus sessions to keep message order, which we load-test before switching producers. Google credits exit transfer fees if you fully leave a service.
If your apps still run on Windows Server 2012 R2, they’ve had no security updates since October 2026, and 2016 support ends January 12, 2027. We move their apps to App Service where the audit allows and rehost the rest to Azure VMs on a newer OS with Azure Hybrid Benefit. 2016 servers kept on-prem can get ESUs via Azure Arc.
Before we migrate web app to Azure App Service from IIS, we audit each site. Windows Authentication comes up most often, then ISAPI filters, custom modules and shared app pools. We swap Windows Authentication for Entra ID sign-in and move certificates to Key Vault. Each site becomes its own App Service app, with settings in Bicep so your team can redeploy it without us.
We audit your legacy system, map hidden dependencies, assess risks, and pick the best migration model (rehost, replatform, or refactor), then deliver an Azure migration roadmap aligned with business continuity and the highest ROI.
We restructure legacy architecture and code so it is cloud ready and maintainable. We decouple monoliths, improve modularity, replace deprecated libraries, harden security, and prepare the system for Azure-native services.
We run legacy and Azure systems in parallel until the new stack is fully validated.
We use staged replication and integrity checks to reduce data loss risk.
We rebuild infrastructure as IaC for predictable, repeatable deployments.
We replace local storage and IIS dependencies for Azure native services.
We modernize databases and fix long standing performance bottlenecks.
We enforce identity-based security and encryption across environments.
We validate critical flows, match performance to the old system, and tune cloud usage to avoid overspend. After deployment, we refine observability, train your team, and leave a clear modernization roadmap.
Book an expert consultation to uncover gaps in your system. Let us modernize your business to its maximum potential.
We focus on modernization for companies unable to grow due to aging systems
We replace only what must be changed, protecting your investment and CTO’s credibility.
HIPAA, HL7/FHIR, SOC2, GDPR, ISO compliance is integrated into every stage.
Integrating into your Git, CI/CD, and workflow tools, we make modernization visible, testable, and traceable
We uncover hidden costs, feature delays, and security gaps and offer ways of their removal
By providing CEOs stakeholder-ready roadmaps and progress metrics, we enable well-grounded transformation
They fulfill your task without seeking to address the issue at the root
Dispersing the focus, they fail to meet specific Healthcare and other industry requirements
Generalized practices, regardless of the product, team, or business specifics
Initiate full rewrites instead of using the working parts and considering business context
Insufficient collaboration leads to poor handover, with documentation debt and weak enablement.
Development happens in isolation, prioritizing code delivery over actual business value.
CEO, Legacy Modernization Strategist
Turns legacy system risk into business decisions: budget, timing, vendor lock-in, handover, and M&A readiness. 30+ modernization projects led in regulated industries.
CTO, Legacy Systems Architect
18+ years in legacy modernization. Explains what happens under the hood of an aging system: hardcodes, bus factor, digital facades, and how to fix the core itself.
Book a 30-minute call with Igor or Andrew at a time that suits you.
Within one business day, we'll reach out to schedule a call.
If you asked for an NDA, we'll sign it before the call.
On the call, Igor or Andrew will go through your system, goals, and constraints with you.
Together, we'll agree on the next step: a quick technical review, a full audit, or a scoped proposal.
Our team breaks the transition into stages and maintains both legacy systems and Azure environments run in parallel before the final switch. Data is synchronized, key workflows are tested under real load, and only then we switch traffic. This way, we can migrate web apps to Azure with minimized downtime.
Lift-and-shift mostly moves virtual machines, IIS sites, and services. However, it also keeps most of the old constraints. Modernization reshapes architecture, tightens security, adds CI/CD, and adopts managed Azure services. So, Azure application migration removes technical debt, not just changes hosting.
We begin with a tech and financial audit: infrastructure bills, release effort, outage impact, and team load. Then, we model different scenarios, including cloud total cost of ownership, risk reduction, and time-to-deliver improvements. You see clear numbers before any app migration to Azure starts. So it is a decision backed by data, not a guess.
Yes, and for many teams this is the safest approach. We usually start with the modules that cause the most cost or risk, set up hybrid connectivity, and move them in stages. This lets you migrate web app to Azure incrementally, keep users working, and prove the benefits before expanding the scope.
We do not leave you with a black box. Your team gets documentation, architecture diagrams, CI/CD pipelines in your repos, runbooks, and monitoring dashboards. We run training sessions with your developers and ops so they can operate, debug, and extend the new Azure setup themselves.
