Assess. Modernize. Prove It Works.

Mainframe, midrange, old .NET, old Java, Windows, Struts.
One partner for the whole legacy estate.

Legacy Can Still Run the Business. It Can't Run What's Next.

Legacy estates, mainframe and non-mainframe, still run the business. What they can’t run is innovation: AI, cloud, and the speed both demand, the modern foundations legacy was never built to provide. And the pressure only builds: run costs keep climbing as more of the budget goes to keeping systems alive instead of building, the skills grow scarce as fewer people know the code and the documentation was never written, and the deadlines are external as platforms, runtimes, frameworks and databases go out of support. High costs, scarce talent, and years of undocumented change stand between you and real agility.

HTC closes that gap, at the pace your business needs. Whatever the stack (mainframe or midrange, old .NET or old Java, Windows, Struts, 4GL, or client-server), if it still runs the business but no longer moves with it, we modernize it. we modernize it. Where the platform still fits, we modernize in place. Where it doesn’t, we rehost to the cloud fast with minimal code change, replatform onto modern environments with targeted rework, or rearchitect completely, where most of our client work happens today, turning undocumented legacy logic into modern, cloud-native, AI-ready applications with human-validated accuracy at every step. Every path, one partner. And with Janushift, our AI platform for reverse and forward engineering, we get you there in months, not years.

4 Paths. One Modernization Partner.

Modernize in Place

Keep the platform, remove the constraint. When the system works but cannot connect or change fast enough, we open it up without moving it.

REST and event APIs over CICS, IMS, DB2 and MQ
Business rules extracted and documented
Monolithic programs refactored into modular services
Modern CI/CD, automated testing and observability on the platform
Right fit when the workload is stable and the problem is integration or change velocity

Modernize in Place

Rearchitecting (Most Common)

Where most of our client engagements live today, because it’s where real transformation happens. Janushift runs its full engine here: reverse engineering then forward engineering, with a human in the loop and real speed behind it.

Reverse Engineering: Scans the codebase, maps dependencies, and reconstructs business rules legacy systems never documented
Forward Engineering: Rebuilds in modern languages, cloud-native, with automated testing built in
Human-validated at every step: So nothing ships on guesswork
The difference: Years of transformation, compressed into months

Rearchitecting (Most Common)

Rehosting (Lift & Shift)

Move to the cloud fast, with minimal code change and minimal risk. Janushift maps your dependencies upfront, so the lift is planned, not guesswork, and nothing breaks on the way over.

Lift-and-shift to AWS, Azure, or GCP, as-is
Bare-minimum code changes, no re-architecture
Dependency mapping before you move, not after
Fastest exit from costly legacy infrastructure and end-of-support platforms

Rehosting (Lift & Shift)

Replatforming

Move to a newer, more capable OS, without the time or risk of a full rewrite. Janushift flags compatibility gaps and dependencies before migration begins, so functionality carries over cleanly.

From z/OS, Unisys, Bull, Fujitsu, HP, Windows Server, and SQL Server to modern runtime environments
Also the path for end-of-support Windows Server, SQL Server, and middleware
Compatibility checked before the move, not discovered after
No disruption to how the application already behaves
Right fit for exiting unsupported platforms fast, on a fixed deadline

Replatforming

Every Legacy Stack, Not Just The Mainframe

Capabilities - From Assessment to Acceleration

Legacy Intelligence & Assessment

Inventory, dependency mapping, and readiness scoring.

Code & Architecture Transformation

AI-powered code conversion into modular, web-based architectures.

Validation, Testing & Cutover

Automated testing and parallel-run output comparison.

Post-Modernization Acceleration

Cloud deployment, DevOps, and observability enablement.

Data and Integration Migration

Data and interface migration with row-level reconciliation.

Proven Before It Goes Live

Modernized code is only finished when you can see it behaves the same. Six checks, every wave.

Janushift extracts the business rules; your experts sign them off before rebuild starts.

Regression suites derived from real legacy behavior, not from the new design.

Same inputs, side by side, compared field by field. Every difference explained before cutover.

Batch windows, throughput and response times measured against the legacy baseline.

You see what each gate caught, and what it missed.

Every wave can be reversed on its own, with legacy and modern running side by side.

Start With 4 Weeks, Not 4 Years

The Legacy Estate Assessment. Fixed scope, fixed fee, four weeks. A decision-ready picture of your estate, whether or not you go further with us. You get an application inventory with dependency maps; a complexity and readiness score per application; a recommended path for each (modernize in place, rehost, replatform, rearchitect, or retire); a data and integration migration assessment; a wave-based roadmap with sequencing and dependencies; indicative cost, duration, and risk per wave; and a target-state architecture with a wave-one test plan. No obligation to proceed. The assessment is yours either way.

Why Janushift? Your Trusted Partner in Modernization

Legacy Modernization That Moves Your Business Forward

AI and Cloud Innovations

Modernized applications run natively on AI and cloud, the two things legacy systems were never built for, turning years of technical debt into a platform ready for what’s next.

Lower Total Cost of Ownership

Modernization shifts spend from keeping the lights on to building what’s next, cutting the cost of keeping legacy alive and freeing budget currently locked into legacy upkeep.

Faster Time-to-Market

Modern, cloud-native architectures let you ship features and respond to market change in weeks, not the 2–4 year cycles legacy systems typically demand.

Reduced Risk, Preserved Knowledge

Modernization done right doesn’t just rewrite code, it reconstructs the business rules and logic buried in undocumented legacy systems, so decades of institutional knowledge survives the transition instead of walking out the door.

Speed and Accuracy, at Scale

HTC’s Janushift accelerates the heaviest lifting, reverse and forward engineering, with up to 90% automation, under 1% code loss and full traceable lineage, and human validation at every step, turning what typically takes years into months.

Faster, More Predictable ROI

With HTC’s phased, AI-accelerated approach, every wave delivers value on its own, with the first capability live in two quarters, not the open-ended multi-year payback legacy transformation programs are known for.