Modernization CIO
The challenge
Legacy estate blocking cloud, AI, or product velocity; rewrite attempts stalling on unknown dependencies.
What you need
As-is documentation and migration waves scoped before capital is committed.
1Who we help
Built for teamsmodernizing legacy estates.
Intronsoft legacy application modernization fits teams that need documented as-is state, defensible target architecture, and wave-based delivery with parity checkpoints, not big-bang rewrites or slide-deck roadmaps.
VP Engineering
The challenge
Monolith strangling releases; offshore teams shipping rewrites that break production behaviour.
What you need
Parity checkpoints and partner engineers who own cutover outcomes.
Enterprise architect
The challenge
Audit and compliance pressure on undocumented systems; architecture options debated without evidence.
What you need
Target architecture options and NFRs validated against a documented as-is baseline.
We work across fintech, healthtech, automotive, manufacturing, insurance, and other industries where legacy systems carry regulatory, integration, or operational risk.
2What we deliver
Wave-based migration,from as-is to target stack.
Forward-deployed partner engineers on your estate, with delivery agents compressing assessment, architecture, and parity validation before migration wave one.
Application modernization
Defensible migration waves with parity checkpoints and rollback paths.
Wave-based migration from monoliths and legacy stacks to modern platforms, with parity checkpoints and rollback paths at every wave.
Frontend modernization
Documented behaviour and modern UI on your release cadence.
Legacy UI rebuilt on a modern stack with living documentation of existing behaviour captured before conversion begins.
Database modernization
Schema parity documentation and cutover runbooks your team can operate.
Oracle, SQL Server, and legacy databases migrated to modern platforms with documented schema parity and cutover runbooks.
As-is and to-be documentation
Dependency maps and behaviour summaries before a single line is rewritten.
The Assessor produces dependency maps, behaviour summaries, and risk registers that auditors and engineering leads need before code is rewritten.
Cloud replatforming and containerization
Cloud targets with security baselines and observability from wave one.
Lift-and-shift, replatform, or refactor paths on AWS, Azure, or GCP with environments, security baselines, and observability from wave one.
API and integration layer modernization
Coexistence patterns and API contracts during incremental migration.
Strangler patterns, event-driven boundaries, and API contracts that let legacy and modern components coexist during migration.
Parity testing and migration validation
Test evidence and quality gates comparing legacy and modern behaviour.
Structured test evidence comparing legacy and modern behaviour, with quality gates wired into your CI/CD pipeline.
Evidence-based from day one
As-is summaries and architecture options before rewrite spend.
As-is summaries, migration wave plans, and architecture options produced by the Assessor and Architect before rewrite spend begins.
3Delivery agents · Assessor & Architect
Estate mapped,before migration waves.
Before engineers rewrite code, the Assessor documents as-is behaviour, dependencies, and migration waves with parity checkpoints; the Architect produces target architecture options, NFRs, and guardrails. Discovery tax is paid up front, not on your migration budget.
Before sprint one
01
Assessor
As-is documentation, migration waves, and parity checkpoints.
Scans your estate and produces as-is documentation, dependency maps, risk registers, and wave-scoped migration plans with parity checkpoints.
02
Architect
Target architecture options, NFRs, and technical guardrails.
Validates target architecture options, NFRs, and technical guardrails against the documented as-is baseline before build commitments.
Together they deliver what conventional assessment phases take weeks to produce, compressed into structured artifacts your team and auditors can trace. Senior engineers then focus on the 20–30% of work that requires human judgement: cutover trade-offs, domain parity, and production migration decisions.
Modernizing data estates alongside applications? See our data and analytics service. Building new features on the target stack? Explore custom software development.
4Engagement process
Phase by phase,with artifacts you keep.
Engagements follow a phase-gate model with visible deliverables at each step. You keep every artifact; we embed partner engineers and run delivery agents on your estate.
01
Modernization Snapshot
Free working session on your estate. Senior consultant runs Assessor and Architect on your context.
You keep
As-is summary, dependency themes, target architecture options
02
Estate assessment and wave planning
Assessor intake across applications, databases, integrations, and compliance constraints. Migration waves scoped with parity criteria.
You keep
As-is documentation, risk register, wave plan
03
Target architecture and roadmap
Architect finalizes stack, boundaries, data strategy, and guardrails. Assessor aligns waves to business priorities and cutover windows.
You keep
Architecture decision record, NFRs, migration roadmap
04
Wave-based delivery
Incremental migration with embedded partner engineers. Parity validation, demos, and reprioritization each cycle.
You keep
Modernized increments, parity test evidence, release notes
05
Cutover and handover
Production cutover, monitoring, documentation, and knowledge transfer. Optional ongoing evolution on the target stack.
You keep
Source code, runbooks, tests, decommission plan
Engineering pods typically deploy in 2–3 weeks after the working session. First migration waves often reach production in 8–16 weeks depending on estate complexity; we quote honestly after the Modernization Snapshot, not from a generic rate card.
Data estate modernization pairs with our data and analytics practice for lineage-first pipeline design.
5Partner engineering
Human layer
Partner engineering makes it accountable
Our engineers embed inside your organization, domain-matched, senior, and outcome-aligned. Not a delivery center.
- Domain-matched to your stack and business
- Senior, they own architecture and production decisions
- Outcome-aligned, clear delivery and quality goals
99%
99% client renewal across multi-year engagements.
6Case study
Production outcomes.Partner engineering.
Embedded senior engineers who own results in production, drawn from 120+ delivered projects. 95% of new clients come from referrals.
7Next steps
Free working session
Every engagement starts here.
Book a call, run a session on your context, and receive a tailored proposal with no commitment required.
- 1
Schedule a call
At your convenience.
- 2
Working session
Senior consultant, not an SDR.
- 3
Tailored proposal
Yours to keep, either way.
7FAQ
Estate assessment, as-is documentation, target architecture, wave-based migration, frontend and database modernization, parity testing, cutover, and optional ongoing support. The Assessor documents as-is state and migration waves before wave one; partner engineers own cutover decisions and production sign-off.
Rewrite vendors often start coding before the estate is understood. We document as-is state and scope migration waves with parity checkpoints first. The Assessor runs estate-level discovery before wave one, so you migrate with evidence instead of betting on a big-bang rewrite.
Wave-based migration is our default: lower risk, earlier value, and coexistence of legacy and modern components. We help you choose the right path during the Modernization Snapshot based on your estate, compliance needs, and cutover constraints.
Yes. Strangler patterns, parallel runs, and phased cutovers are standard scope. Architecture guardrails document coexistence boundaries before each wave ships.
An as-is summary and target architecture options from your estate brief, run by a senior consultant using the Assessor. You keep the artifact. We respond within 24 hours with no commitment required.
The Assessor documents expected behaviour before migration; parity test evidence compares legacy and modern outputs at each wave. Quality gates integrate with your CI/CD pipeline so regressions are caught before cutover.
Related services
Modernization programs often extend into new product delivery, data platform work, or AI features on the target stack. Explore what pairs with your roadmap.