Every BFSI leader we talk to at Speqto Technologies says some version of the same thing: “Our core system works, but it’s holding us back.” Then in the next breath: “But we can’t afford even four hours of downtime.” That tension between needing to modernize and being terrified of breaking something that processes millions of transactions a day is exactly why so many banks, NBFCs, and insurers keep patching 15-year-old COBOL systems instead of replacing them.
We’ve worked with a mid-sized NBFC that was still running loan origination on a system built in 2009, and a cooperative bank whose core banking software hadn’t seen a major upgrade since 2014. In both cases, the fear wasn’t the technology — it was the migration itself. Here’s how we approached modernization without stopping the business, and what we’ve learned actually works.
The biggest mistake we see is companies planning a big-bang cutover — shut down the old system on a Friday, go live with the new one on Monday. In BFSI, this almost never goes cleanly, because legacy systems are entangled with dozens of downstream dependencies: regulatory reporting, reconciliation jobs, third-party integrations, even manual processes that IT doesn’t fully know about.
Instead, we use the strangler fig approach — build an API layer around the legacy system first, and route new functionality through it while the old system keeps running underneath. For the NBFC mentioned above, we didn’t touch their core loan management system for the first four months. We built an API gateway that let their new mobile app and collections dashboard talk to the legacy database without a single line of the old COBOL-adjacent code being touched. Only once that layer was stable did we start migrating modules one at a time.
Trying to modernize “the whole core banking system” is a project nobody can scope properly. Break it into functional slices — KYC, disbursement, repayment, reporting — and migrate each one independently, keeping both old and new running in parallel until you’re confident.
With the cooperative bank, we started with their reconciliation module because it was low-risk (internal use only, not customer-facing) but high-pain (taking their ops team 3 hours daily). Once that was live and stable for six weeks, we moved to customer onboarding, then finally touched the ledger system last — because that’s the part where a mistake actually costs money and regulatory trust.
This is the step most teams skip because it feels slow, and it’s the one that has saved us the most pain. Before switching a process fully to the new system, run both systems in parallel for real transactions — the old system stays the system of record, but the new system processes the same data silently in the background. Compare outputs daily.
For the NBFC’s disbursement module, we ran shadow mode for three weeks. We caught a rounding discrepancy in interest calculation on day 9 that would have caused reconciliation headaches for thousands of loan accounts if it had gone live directly. That’s the entire point of shadow mode — it turns “we hope this works” into “we’ve proven this works with real production data.”
In BFSI, data isn’t just data — it’s audit trails, KYC records, transaction histories that regulators expect to be retrievable years later. Migrating this without disruption means:
A lot of modernization projects get technically approved by IT and then stall for months because compliance teams weren’t consulted early enough on audit trail requirements or data residency rules. With the cooperative bank, we had their compliance officer in weekly syncs from week one — not because it was required, but because catching a compliance gap in week 3 is a lot cheaper than catching it in week 30.
Even a perfectly executed technical migration fails if branch staff or relationship managers don’t trust the new system. We’ve seen teams quietly keep using Excel sheets alongside a shiny new CRM for months because nobody trained them properly or gave them a way to flag issues without going through five layers of escalation. Build a feedback loop — a simple Slack channel or ticket queue where frontline staff can report friction — and treat that feedback as seriously as a production bug.
Modernizing legacy systems in BFSI isn’t a technology problem you solve with a better tech stack — it’s a sequencing and risk-management problem. The companies that pull it off aren’t the ones with the most advanced architecture; they’re the ones patient enough to migrate in slices, validate obsessively, and keep a safety net until they’ve earned the right to remove it.
At Speqto Technologies, that’s the playbook we bring to every BFSI modernization engagement — not because it’s the fastest way to migrate, but because it’s the only way to do it without your operations team losing sleep.
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