Legacy Modernization
CoreLine modernizes aging enterprise applications without downtime. We migrate monoliths, replace outdated stacks, and deliver production-ready systems on modern infrastructure - while keeping the business running.
Assessment & Strategy
Legacy codebase audit
Migration roadmap
Risk and ROI analysis
Migration & Re-architecture
Monolith decomposition
Cloud-native migration
Database modernization
Continuity & Handoff
Zero-downtime cutover
Team knowledge transfer
Post-migration support
Sound familiar?
Your dev team spends more time maintaining legacy systems than building new features
The original developers are gone and no one fully understands the codebase
Compliance or security requirements are forcing a platform change you keep postponing
Every vendor you talk to wants to rewrite everything from scratch - you need a pragmatic migration
Modernization is not a rewrite. We assess what works, replace what doesn't, and migrate incrementally so the business never stops. Every step is reversible until cutover.
We map the existing system: architecture, dependencies, data flows, integrations, and risk areas. The output is a modernization roadmap with phased milestones, not a vague estimate.
We replace components one at a time using the strangler-fig pattern. New services run alongside legacy ones. Each migration step is independently testable and reversible.
Traffic shifts to the new system with zero-downtime cutover. We run parallel validation, performance testing, and compliance verification before decommissioning legacy components.
Modernization outcomes
Using solutions such as React Native, Flutter, AWS, and many others makes it possible for us to upgrade your product as much as possible and to achieve a thriving collaboration. Here you will find our guide through our most used technologies and case studies related to each one.
AWS offers the tools to build powerful, flexible, and scalable applications, from compute and storage to databases and content delivery.
Simply put, Flutter is Google’s cross-platform framework that lets you build mobile, web, desktop, and embedded apps, all from a single codebase.
React Native is Facebook’s cross-platform framework that combines the best of React with native platform features - perfect for new projects or enhancing existing ones.
Other technologies we use
Frequently asked questions
No. Most modernizations are incremental. We assess what works, keep it, and replace only the components that block compliance, performance, or feature velocity. Full rewrites are a last resort and only recommended when the cost of maintaining the legacy system exceeds the cost of replacement.
We use the strangler-fig pattern: new services run alongside legacy ones, traffic shifts incrementally, and each step is independently testable and reversible. Parallel validation ensures the new system behaves identically before decommissioning legacy components.
PHP, .NET, Ruby on Rails, Java/Spring, and custom monoliths. We migrate to TypeScript/React, Node.js, Python, Go, and AWS/GCP infrastructure. We also handle database migrations from Oracle, SQL Server, and MySQL to PostgreSQL.
First production milestone in 8-12 weeks. Full platform modernization runs 6-18 months depending on scope and legacy complexity. We publish a phased roadmap at discovery so you know what ships when.
Data integrity is the top priority. We run parallel databases during migration, validate data consistency at every step, and maintain rollback capability until cutover is complete. Audit trails are preserved throughout.
