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Udyat Technologies
Service 03
Core service area

ERP and Legacy System Modernization

Move off rigid, expensive systems without stopping the business.

Move away from rigid, high-maintenance legacy systems: modernization roadmaps, replacement strategy, integration design, migration planning, and phased execution.

Legacy
Unsupported v7.2
Custom patches
One consultant
Modern
Cloud-native
API-connected
Team-owned
Migration wavesReconciled
Wave 1 · Reporting✓ signed off
Wave 2 · Purchase & stores✓ signed off
Wave 3 · Core ledgerin progress
You are probably here because

These are the signs this work is overdue

If several of these are true for your business, this service is usually where the fastest return sits.

The system runs on a version nobody is allowed to upgrade.
One consultant knows how it works, and they are close to retiring.
Every small change is quoted in weeks and costs more than it should.
You export to Excel to do anything the ERP was not configured for.
Annual maintenance and licence renewals keep climbing for the same functionality.
The vendor has announced end of support, or already ended it.
What's included

What this engagement actually contains

Not every element applies to every business. We scope to what your operations need, and say so when something is not worth doing.

01

Legacy assessment and risk mapping

We establish what the system actually does — including the undocumented parts — and where the genuine risks sit: unsupported versions, single points of knowledge, brittle integrations, and data quality.

Functional inventoryCustomisation auditDependency mapKey-person risk
02

Modernization strategy

Not everything should be rewritten. We assess each component for retire, retain, re-host, re-platform, refactor, or replace — and justify the call with cost and risk, not fashion.

6R assessmentBuild vs buyCost/risk justificationSequencing
03

Integration and coexistence layer

The bridge that lets old and new run together. This is what makes a phased migration possible instead of a terrifying big-bang cutover at midnight on a Saturday.

API facadesEvent bridgesTwo-way syncReconciliation checks
04

Data migration and reconciliation

Extract, clean, map, load, and — critically — prove it. Every migration ships with reconciliation reports your finance team can sign off against.

Data profilingCleansing rulesMapping specificationBalance reconciliation
05

Phased cutover execution

Module by module, or site by site, with a rehearsed rollback at every step. The business keeps trading throughout.

Cutover runbookDress rehearsalsRollback planHypercare
06

Decommissioning

The saving only lands when the old system is genuinely switched off. We plan archival, statutory retention, and licence termination as part of the programme, not as an afterthought.

Archive strategyStatutory retentionLicence exitRun-cost verification
Typical outcomes

What changes when this is done properly

Indicative ranges from comparable engagements. Your assessment produces numbers for your own operations.

40%
lower running cost
after modernization and decommissioning
0
days of trading lost
phased cutover with rehearsed rollback
10x
faster change requests
days instead of quarters
100%
reconciled balances
signed off before cutover
What you receive

Tangible deliverables, not a slide deck

Every engagement ends with artefacts your team can use, extend, and operate without us. Documentation and handover are part of the scope, not an optional extra.

  • Functional and customisation inventory of the legacy estate
  • Modernization strategy with a retire/retain/replace decision per component
  • Target architecture and integration design
  • Data migration specification with mapping and cleansing rules
  • Phased cutover runbook including rehearsal and rollback plans
  • Reconciliation reports and a verified decommissioning plan
How the work runs

A phased engagement, not a big bang

Each phase is independently valuable. You can pause after any of them and still be better off than when you started.

  1. 01

    Understand what you actually have

    Including the customisations nobody documented and the Excel files that quietly became part of the process.

    2–4 weeks
  2. 02

    Decide the strategy per component

    Retire, retain, re-host, re-platform, refactor, or replace — with the cost and risk case for each.

    2 weeks
  3. 03

    Build the coexistence layer

    Integration first. Once old and new can talk, migration stops being a single high-stakes event.

    4–8 weeks
  4. 04

    Migrate in phases

    Lowest-risk module first to prove the process, then progressively the core. Each phase reconciled and signed off.

    3–9 months
  5. 05

    Decommission and verify the saving

    Archive, terminate licences, switch it off, and confirm the run cost actually fell.

    2–4 weeks
How we build it

The technology we typically reach for

Chosen for how well it is supported and how easily your team can take it on — not for how impressive it sounds.

Integration
  • REST and GraphQL APIs
  • Message queues
  • Change-data-capture
  • Webhooks
Data
  • PostgreSQL
  • ETL pipelines
  • Profiling and cleansing tooling
Platforms
  • Tally
  • SAP
  • Oracle
  • Microsoft Dynamics
  • Odoo
  • Custom in-house systems
Delivery
  • Infrastructure as code
  • Blue/green deploys
  • Automated reconciliation
Industries

Where this service lands hardest

The sectors where we most often deliver this work, and where the payback is usually fastest.

FAQ

ERP & legacy modernization — questions we get asked

Can we keep Tally and still modernize?

Yes, and it is often the right answer. Tally handles statutory accounting well; the pain is usually everything wrapped around it. We integrate rather than replace, so finance carries on unchanged while operations move onto a modern system.

How do you avoid a failed big-bang cutover?

By not doing one. The integration and coexistence layer comes first, so old and new run in parallel. Each module migrates independently, reconciles, and has a rehearsed rollback. No single weekend decides the outcome.

Our data is a mess. Is migration even possible?

It usually is, but cleansing is scoped as real work rather than assumed away. We profile the data early so the true condition is known before commitments are made, and we agree explicitly what gets cleaned, what gets archived, and what gets dropped.

What if the original developer is long gone?

That is a common starting point. We reconstruct behaviour from the database, the running system, the integrations, and the people who use it daily. It takes longer than reading good documentation, but it is entirely tractable.

Next step

Ready to talk about erp & legacy modernization?

Start with a short conversation. We will tell you honestly whether this is the right place to begin, or whether something else pays back faster.