A full rewrite is the riskiest path. We run a modern system alongside the legacy core and migrate piece by piece, with mirrored traffic proving parity before any cutover.
Stakeholders fear catastrophic downtime, so the monolith never gets replaced.
The strangler-fig pattern builds a modern application alongside the legacy core, migrating function by function.
COBOL mainframes run critical benefits and permitting systems no one wants to touch.
A modern API layer wrapped around the mainframe, refactoring core logic gradually behind the prime.
Brittle, undocumented codebases slow every change engineering tries to make.
Targeted refactoring that removes performance bottlenecks without disrupting the user experience.
Legacy and modern run side by side, outputs compared .
The same traffic flows through both the legacy system and the modern AI system, and every output is compared for parity before a single increment cuts over, so nothing ships until it is proven and every step is reversible.
Legacy modernization spend is growing near 18 percent a year as old systems stop integrating.
Roughly 70 percent of large enterprises still operate software over twenty years old.
Most technology officers name mainframe skills shortages as their top infrastructure risk.
COBOL skills retire, mainframe costs climb, and every integration attempt stalls on undocumented logic. These figures describe the legacy modernization sector, not Techtiz engagements—and what standing still costs.
Lines of COBOL still running in production globally
Reuters via DreamFactory, 2025
Of the specialized COBOL workforce retires each year, draining knowledge
DreamFactory, 2025
Annual rise in legacy mainframe maintenance cost from MIPS pricing
Tech-Stack, 2026
Cost to modernize per function point, depending on approach
Tech-Stack, 2026
Automated scanners map undocumented logic and architecture before any refactoring begins.
A modern environment runs beside the legacy core so daily operations never stop.
Traffic is mirrored through both systems and outputs compared programmatically for parity.
We modernize component by component, reversible at every stage, never in one risky rewrite.
For SLED scope under NAICS 541512, we untangle mainframe and legacy technical debt as your subcontractor, working behind the prime, never facing the agency.
NDA-first, subcontract-only. We work behind the prime, under your brand. We do not pursue prime contracts and we never face the agency.
Verified and reversible. Mirrored traffic proves parity before cutover, and every increment can be rolled back.
Built for security review. Architecture assessments, dependency maps, and zero-downtime strategies a procurement review can read.
No. We use parallel running environments to ensure zero downtime during the cutover process.
We use automated dependency scanners to map the logic and architecture before any refactoring begins.
We strongly advise against a full rewrite. We modernize incrementally, component by component.
We run mirrored traffic through both systems simultaneously and compare the outputs programmatically to ensure perfect parity.
A fair instinct. The danger is doing it under pressure later. We de-risk it with parallel environments and incremental, mathematically verified, fully reversible cutovers.
Tell us which old system everyone is afraid to touch. That is where we start mapping.
Scope a modernization
Java 
.NET 
COBOL 
Oracle 
Kubernetes