Multi-phase enterprise modernization — legacy redesign, cloud migration, and integration restructuring with architecture governance at every stage.
Cloud migrations across 50+ microservice environments. Enterprise programs across Manufacturing, EdTech, Energy, and HealthTech.
Enterprise systems reach a point where maintaining them costs more than changing them and every year of delay makes the eventual migration harder.
This engagement fits when:
Warning signs
Legacy systems blocking new feature delivery
Migration attempts that stalled or failed
Dependencies too complex to untangle without a map
Technical debt compounding faster than the team can address
Existing systems are mapped, restructured, and rebuilt using modern architecture patterns. The goal is to modernise the architecture, not erase the business logic.
Migration to AWS, Azure, or GCP is designed as an architectural exercise first: service boundaries redrawn, data strategies defined, networking and security architecture validated.
Legacy integrations weren't built for migration. We redesign APIs, data pipelines, and third-party connections as part of the core modernization.
Modernisation is the right moment to address security architecture — authentication patterns, authorisation models, secret management, and network exposure rather than retrofitting after.
Questions we answer
Which services should migrate first — and why?
What dependencies will break during migration?
How do you modernize without disrupting live traffic?
What's the minimum viable migration that proves the approach?
Architecture-first modernization starts with an accurate understanding of what exists. From that foundation, the program is designed in phases. Not everything needs to change at once.
The components that constrain the business most severely are prioritized. The components that work and carry low risk can be migrated later or left in place. This approach makes the large modernization programs survivable.
Every phase has a defined output and a client-controlled gate. Nothing proceeds to the next phase without client review and sign-off. The client always controls what proceeds.
How this differs
Architecture mapped before the first migration decision
Phased migration — never big-bang
Each phase has independent value if the programme pauses
Client-controlled gates at every transition
Modernization programs at Kaarastu follow the four-phase engagement model — Discovery, Architecture, Execution, Handoff scaled for multi-phase enterprise scope.
Large programs are broken into workstreams with independent milestones and separate gates. The dependencies between workstreams are mapped during Discovery. This ensures that a delay in one workstream doesn't block the entire program.
Demos every two weeks during Execution phases mean the client has continuous visibility into progress and can redirect based on what's actually being built.
Depends on scope. A focused migration of 5–10 services typically runs 4–6 months. A full enterprise modernization across 50+ services can take 12–18 months. We break large programmes into workstreams with independent milestones, so you see progress throughout the programme.
Yes. When a programme pauses, you retain everything completed to that point — architecture maps, migration plans, completed service migrations. We document the state of any in-flight work so a future team can pick up without reconstructing context.
That's common. We start every engagement by mapping what actually exists today. If there's no documentation, we reverse-engineer the current state from code, infrastructure, and interviews with your team.
Yes. We design migration phases to avoid blocking your product roadmap. Critical feature work continues in parallel. The phased approach means we're never in a state where everything is mid-migration — completed phases are stable and operational.
Each phase is designed with rollback paths. We don't cut over until the new path is validated alongside the old one. If something goes wrong, you fall back to the previous state. That's why we avoid big-bang migrations.
A senior architect will review your situation and recommend the right starting point.