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Legacy Application Modernization Experts
Legacy App to Kubernetes Migration: Modernize Without Costly Rewrites
Migrate your legacy applications to Kubernetes with minimal code changes. Expert containerization, phased modernization, and zero-downtime deployment on EKS, AKS, or GKE.
100+
Legacy Apps Migrated
No Rewrite
Required for Most Apps
Zero-Downtime
Migration Strategy
Trusted by enterprises modernizing legacy applications
Modernize Legacy Applications Without the Rewrite Risk
Legacy applications power critical business processes, but they're often stuck on aging infrastructure, difficult to scale, and expensive to maintain. The conventional wisdom says "rewrite everything"—but full rewrites are expensive, risky, and often fail. There's a better way.
Our Kubernetes migration services have modernized 100+ legacy applications—.NET Framework, Java EE, PHP, and custom stacks—by containerizing them for Kubernetes with minimal code changes. We start with lift-and-shift for immediate infrastructure benefits, then incrementally modernize applications over time.
Whether your legacy apps run on bare metal, VMs, or outdated cloud setups, we containerize and deploy them to EKS, AKS, or GKE with proper CI/CD pipelines and monitoring.
Legacy Infrastructure vs Kubernetes
What changes when you modernize legacy applications
Organizations that migrate legacy applications to Kubernetes achieve modern operations without the risk and cost of full rewrites.
Legacy Application
- Deployed manually to bare metal or VMs
- Hardcoded configuration in files
- No health monitoring—failures go undetected
- Manual scaling requiring infrastructure changes
- Risky deployments with extended downtime
- Environment-specific builds and config drift
Containerized on Kubernetes
- Automated container deployments via GitOps
- Externalized config via ConfigMaps and Secrets
- Liveness and readiness probes with auto-restart
- Horizontal Pod Autoscaler based on metrics
- Rolling updates with automated rollback
- Immutable images with environment-specific config injection
Legacy Application Migration Services
Modernize legacy apps for Kubernetes without rewrites
Legacy Application Assessment
Evaluate your legacy applications—.NET Framework, Java EE, PHP, COBOL wrappers, and custom stacks—for Kubernetes readiness. We score each application on containerization complexity, identify blockers, and recommend the optimal migration strategy: lift-and-shift, replatform, or selective refactoring.
- Application portfolio analysis
- Containerization readiness scoring
- Blocker identification & remediation
- Migration strategy recommendation
Containerization Without Rewriting
Package legacy applications into Docker containers with minimal code changes. We handle Windows-to-Linux transitions, legacy dependency management, configuration externalization, and multi-stage builds for optimized images.
- Legacy app containerization
- Windows container support
- Dependency management
- Configuration externalization
Phased Modernization Path
Move legacy apps to Kubernetes in phases: containerize first for quick wins, then incrementally modernize. We implement health checks, graceful shutdown, externalized configuration, and logging standards—making legacy apps cloud-native over time without big-bang rewrites.
- Health check implementation
- Graceful shutdown handling
- 12-factor app alignment
- Incremental modernization roadmap
State & Data Migration
Migrate legacy databases, file systems, and session state to Kubernetes-compatible storage. We handle SQL Server to PostgreSQL migrations, file storage to object storage, and session management using Redis or cloud-native solutions.
- Database migration planning
- File storage to object storage
- Session state externalization
- Data validation & integrity testing
Legacy Modernization Strategies
The right approach for every application
Lift-and-Shift
Containerize the application as-is for the fastest path to Kubernetes. Ideal when infrastructure benefits alone justify migration.
Replatform
Add health checks, externalize config, and implement graceful shutdown. Minimal effort, maximum Kubernetes benefit.
Selective Refactor
Extract high-value components into microservices while keeping the core application containerized. Best ROI for complex systems.
Windows Containers
.NET Framework applications run on Windows node pools in Kubernetes, preserving compatibility while gaining orchestration.
Database Modernization
Migrate from legacy databases to managed services or Kubernetes operators with minimal-downtime cutover strategies.
Incremental Cloud-Native
After initial migration, progressively adopt cloud-native patterns: 12-factor config, structured logging, metric endpoints.
Our Legacy Migration Process
Phased modernization that delivers value early
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Application Assessment
Deep analysis of your legacy application: technology stack, dependencies, state management, configuration, and infrastructure requirements. We score containerization readiness and identify blockers that need resolution before migration.
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Containerization & Pipeline
Write Dockerfiles, handle dependency management, externalize configuration, and build CI/CD pipelines. We create development, staging, and production environments with consistent container deployments.
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Kubernetes Deployment & Testing
Deploy containerized applications to Kubernetes with proper resource management, health checks, and monitoring. Validate functionality, performance, and data integrity with comprehensive testing.
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Cutover & Incremental Modernization
Execute zero-downtime cutover from legacy infrastructure. Provide a modernization roadmap for incremental improvements: autoscaling, observability, security hardening, and eventual microservices extraction.
Why Choose Tasrie IT Services for Legacy Migration
Experience with every legacy stack imaginable
100+ Legacy Apps Migrated
.NET Framework, Java EE, PHP, Python, Ruby—we've containerized them all
No Rewrites Required
Most applications migrate with minimal or zero code changes via lift-and-shift
Windows & Linux Support
Full support for Windows containers and Linux-based legacy workloads
Phased Modernization Path
Migrate first, then incrementally adopt cloud-native patterns at your own pace
What makes us different
We're not a typical consultancy. Here's why that matters.
No vendor bias
No commissions, no referral incentives, no behind-the-scenes partnerships. We stay neutral so you get the best option — not the one that pays.
Engineering-first, not sales-first
All engagements are led by senior engineers, not sales reps. Conversations are technical, pragmatic, and honest.
Technology chosen on merit
We help you pick tech that is reliable, scalable, and cost-efficient — not whatever is hyped or expensive.
Built around your real needs
We design solutions based on your business context, your team, and your constraints — not generic slide decks.
Trusted Legacy Modernization Partner
What our customers say about our migration services
"Their team helped us improve how we develop and release our software. Automated processes made our releases faster and more dependable. Tasrie modernized our IT setup, making it flexible and cost-effective. The long-term benefits far outweighed the initial challenges. Thanks to Tasrie IT Services, we provide better youth sports programs to our NYC community."
Anthony Treyman
Kids in the Game, New York
"Tasrie IT Services successfully restored and migrated our servers to prevent ransomware attacks. Their team was responsive and timely throughout the engagement."
Rose Wang
Operations Lead
"Tasrie IT has been an incredible partner in transforming our investment management. Their Kubernetes scalability and automated CI/CD pipeline revolutionized our trading bot performance. Faster releases, better decisions, and more innovation."
Shahid Ahmed
CEO, Jupiter Investments
"Their team deeply understood our industry and integrated seamlessly with our internal teams. Excellent communication, proactive problem-solving, and consistently on-time delivery."
Justin Garvin
MediaRise
"The changes Tasrie made had major benefits. Fewer outages, faster updates, and improved customer experience. Plus we saved a good amount on costs."
Nora Motaweh
Burbery
Our Industry Recognition and Awards
Discover our commitment to excellence through industry recognition and awards that highlight our expertise in driving DevOps success.
Legacy Application Migration FAQs
Common questions about modernizing legacy apps for Kubernetes
Can legacy applications run on Kubernetes without being rewritten?
Yes. Most legacy applications can be containerized and run on Kubernetes with minimal or no code changes. The key is proper containerization: externalize configuration, handle graceful shutdown, implement health check endpoints, and manage persistent state correctly. For applications with kernel-level dependencies, KubeVirt can run VMs inside Kubernetes as a transitional step.
What legacy technology stacks can you migrate?
We have experience migrating .NET Framework (including Windows containers), Java EE (JBoss, WebLogic, WebSphere), PHP (Laravel, WordPress, custom), Python (Django, Flask), Ruby on Rails, classic ASP, and custom C/C++ applications. We also handle legacy databases (SQL Server, Oracle, MySQL) and middleware (message queues, ESBs). Our Kubernetes consulting team has seen it all.
What is the difference between lift-and-shift and replatforming?
Lift-and-shift containerizes the application as-is with no code changes—fastest but doesn't leverage Kubernetes features like autoscaling. Replatforming involves targeted modifications: adding health checks, externalizing config, implementing graceful shutdown. We recommend replatforming for most workloads—it's minimal effort but unlocks significant Kubernetes benefits like self-healing and rolling updates.
How do you handle Windows-based legacy applications?
Kubernetes supports Windows containers via Windows node pools on EKS, AKS, and GKE. For .NET Framework applications, we build Windows container images. For newer apps, we help migrate to .NET 8+ for Linux container support, which offers better performance and broader Kubernetes compatibility.
How long does a legacy application migration take?
Simple stateless applications take 1-3 weeks. Stateful applications with databases take 3-8 weeks. Complex legacy systems with multiple dependencies may take 2-4 months per application. We recommend starting with a pilot migration of the simplest application to validate the approach, then migrating in waves. Contact us for a detailed assessment.
Ready to Modernize Your Legacy Applications?
Get a free migration assessment. We'll analyze your legacy applications and provide a containerization roadmap with effort estimates, risk analysis, and a phased modernization plan.
"We build relationships, not just technology."
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Faster delivery
Reduce lead time and increase deploy frequency.
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Reliability
Improve change success rate and MTTR.
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Cost control
Kubernetes/GitOps patterns that scale efficiently.
No sales spam—just a short conversation to see if we can help.
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