From legacy to cloud-native
We modernize .NET, SQL Server, and Oracle Forms applications with Aurora Babelfish, AWS Transform, and Angular or React frontends. Microsoft and Oracle license freedom, refreshed user experience, and architecture ready to scale.
Modernization goes beyond lift-and-shift. Caleidos brings legacy Microsoft (.NET Framework + SQL Server) and Oracle (Forms & Reports) stacks into cloud-native architectures on AWS, reducing license TCO and unlocking innovation. We use official AWS tooling — Aurora Babelfish for PostgreSQL, AWS Transform, Microservice Extractor for .NET — and proven patterns of strangler fig, containerization, and serverless. Modernization lives inside the AWS MAP framework and is executed progressively, wave by wave.
What you get with Caleidos
Microsoft without licenses
Aurora Babelfish for PostgreSQL is the T-SQL/TDS compatibility layer that allows .NET applications and SQL Server stored procedures to run on Aurora PostgreSQL without rewriting application code. Cuts SQL Server license costs by up to 90%.
Automated AWS Transform
AWS AI agent that converts .NET Framework to .NET cross-platform Linux and T-SQL to PostgreSQL. Accelerates Microsoft modernization with quality and traceability.
Oracle Forms to modern frontend
We migrate Oracle Forms & Reports stacks to Angular or React frontends served from CloudFront, with APIs on Lambda, ECS, or EKS. Oracle Forms/Reports/WebLogic license freedom and a modern user experience.
Strangler fig refactoring
Progressive modernization without big bang. We extract microservices from monoliths with AWS Microservice Extractor, containerize with ECS or EKS, and move to serverless when applicable.
AWS Kiro: from Figma to code
2026 emerging capability: AWS Kiro converts Figma designs into frontend code that respects your design system. Devs and designers aligned in the same language, accelerated time-to-market and POCs validated in just a few weeks with AWS funding.
How we work
Application Portfolio Assessment
We evaluate each application against the 7 R framework (Retire, Retain, Rehost, Relocate, Repurchase, Replatform, Refactor). Output: portfolio map with the right decision per workload and modernization business case.
Proof of Modernization
We run a pilot with the highest-impact / controlled-risk application. We validate Babelfish, AWS Transform, or the Forms-to-Angular pattern before scaling.
Modernization Waves
Progressive modernization waves with CI/CD, automated testing, and rollback. Each wave frees licenses and delivers measurable business value.
Cloud-native operation
Caleidos Lens© 24×7 operates the modernized applications with observability, FinOps, and continuous evolution.
Microsoft modernization cases
Aurora Babelfish + AWS Transform
SQL Server license freedom by migrating to Aurora PostgreSQL while keeping existing T-SQL logic, conversion of .NET Framework applications to cloud-native .NET with AWS Transform.
Read full case →Tech stack
What we get asked the most
What is Aurora Babelfish and what is it for?
Aurora Babelfish for PostgreSQL is a T-SQL and TDS protocol compatibility layer that allows .NET applications and SQL Server stored procedures to run on Aurora PostgreSQL without rewriting application code. It is the fastest way to free SQL Server licenses while preserving existing business logic investment.
What is AWS Transform?
AWS AI agent launched in 2024 to automate legacy modernization. Converts .NET Framework to .NET cross-platform Linux, translates T-SQL to PostgreSQL, and extracts microservices from monoliths. Evolution of Migration Hub Refactor Spaces, Microservice Extractor for .NET, and Porting Assistant.
How do you modernize Oracle Forms and Reports?
We migrate the legacy Oracle Forms & Reports stacks (very common in Latam banking, retail, and government) to modern Angular or React frontends served from CloudFront. APIs run on Lambda, ECS, or EKS against Aurora PostgreSQL or Oracle on RDS as needed. The result: Oracle Forms/Reports/WebLogic license freedom, a modern user experience, and cloud-native architecture.
What are the 7 R of modernization?
Official AWS framework for deciding what to do with each application: Retire, Retain (on-premise), Rehost (lift-and-shift), Relocate (move hypervisor), Repurchase (switch to SaaS), Replatform (lift-and-reshape), and Refactor (deep modernization). Caleidos performs the full portfolio assessment and decides the right R per workload.
How much can I save freeing Microsoft and Oracle licenses?
Savings vary with estate size and the mix of licensed products. In typical mid-market cases, migrating SQL Server to Aurora PostgreSQL with Babelfish and modernizing Oracle Forms/Reports/WebLogic frees a meaningful share of the annual license bill and unlocks budget for innovation. We model the concrete savings with you in the Application Portfolio Assessment.
Is modernization a big bang?
No. We apply the strangler fig pattern: new functionality is built on the modernized architecture and the legacy monolith is progressively decommissioned. Each wave delivers value without disrupting operation. Caleidos operates with CI/CD, automated testing, and rollback at each step.
How does modernization relate to migration?
Modernization is one of the phases of the AWS Migration Acceleration Program (MAP) — specifically Migrate & Modernize. For many workloads we first rehost and then modernize in waves. For others, modernization runs from day one. We decide workload by workload in the Application Portfolio Assessment. Learn more at /en/services/migration.
Ready to get started?
Tell us about your challenge. No pitch, no commitment. Just understanding.
Application Portfolio Assessment