App Modernization

Turn legacy applications into a competitive advantage. Rehost, refactor, or rebuild on the platform that fits your workload, your budget, and your timeline, whether AWS, Azure, Google Cloud, private cloud, or on-prem.

Legacy applications create drag across the business

Every month a monolith stays as-is, it costs you in licensing you can't shed, in releases that take weeks instead of hours, in talent stuck maintaining instead of building, and in infrastructure you're forced to keep refreshing. Most modernization efforts stall because they're framed as one giant rewrite with all risk and no early wins.

RapidScale modernizes the way real portfolios move, creating a clear plan with phases, milestones, and a budget, not a multi-year leap of faith. 

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Legacy to cloud-native

We help you decide what to modernize and how, execute every motion from rehost to microservices, and operate the result as a modern DevOps practice.

Advise

 
Know what to move, and how

Our architects assess your applications against your business goals, your team's strengths, and your cost structure, then hand you a recommended path per application, sequenced into phases with budget and timeline attached.

  • Application portfolio assessment and dependency mapping
  • Per-app modernization path (rehost, replatform, refactor, rebuild, replace, retire)
  • Cost and licensing analysis, including what you stop paying
  • Phased roadmap with milestones, budget, and success criteria
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Implement

 
The modernization motions that move the needle.

This is where the work happens. We execute the path each application needs without freezing feature development or betting on a single cutover.

  • Rehost and replatform when speed matters most, with a clean foundation to modernize on later
  • Refactor legacy codebases and runtimes, moving .NET Framework to modern .NET on Linux to shed licensing and unlock PaaS and serverless
  • Break monoliths into independently deployable microservices using incremental patterns
  • Containerize and run on Kubernetes (EKS, AKS, GKE) or serverless for portability and elastic scale
  • Stand up CI/CD pipelines with automated testing, approval gates, and instant rollback so releases become routine
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Manage

 
Run a modern DevOps operating model, not a fragile one.

Modernization isn't a finish line. We operate the DevOps practice that keeps modernized applications fast, reliable, and cost-effective to run.

  • Operate, harden, and continuously improve CI/CD pipelines as your release cadence grows
  • Infrastructure as code (Terraform, CloudFormation, Ansible, Packer) – every environment reproducible, every change reviewable
  • Observability and SRE practices – measurable reliability targets and fewer surprises in production
  • Cloud architecture, deployment, and go-live transition support
  • A "do-with" model that transfers the DevOps practice to your team, so you can build on it without depending on us
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Case Study

Arise replaced a rigid monolithic automation platform with a scalable microservices architecture on AWS in two months, with their own team trained to run it independently afterward.

Arise

Start with a Modernization Assessment

Companies that modernize their apps are 3x more likely to see clear ROI on AI. The ones who succeed start by knowing exactly where to begin.

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Don’t let legacy apps hold the business back.

Talk to a RapidScale advisor and walk away with a clear path for every application: keep, move, modernize, or retire.