Legacy modernization that keeps running

We never run a big-bang cutover. We keep the legacy and target systems running in parallel and use Change Data Capture to keep the two databases synchronized while both stay available to your operations. At every billing or processing cycle, automated scripts compare the outputs of both systems row by row and confirm full reconciliation, so any discrepancy is caught before it can affect production. A client segment is migrated permanently only once the target system matches the legacy output to the cent. Because the legacy system remains the source of truth until that point, the migration stays fully reversible. This is how we keep transaction-critical environments available throughout the transition instead of betting everything on a single switchover window.

We focus on critical Oracle and SAP environments, including billing, charging, and high-volume data pipelines where downtime is not an option. On the database side, we map Oracle estates onto PostgreSQL or cloud-managed databases and use Change Data Capture for continuous synchronization during the move. On the application side, we decouple monolithic systems into independent services where doing so reduces operational risk and lets your teams deploy components separately. We also modernize the integration layer between these systems and the surrounding ERP and reporting stack. DNA Solutions brings 15+ years of engineering experience across these platforms, applied on billing, charging and data infrastructure for European operators, so the modernization path we propose is grounded in systems we have run in production.

It often can. In one engagement, we removed over €1M in yearly software licensing fees for a European enterprise client by modernizing legacy infrastructure. The work starts with an audit that maps the existing estate, quantifies the current licensing footprint and flags the workloads that carry the most cost without depending on proprietary features. We then identify which of those workloads can move to open-source or cloud-managed databases, typically PostgreSQL or a managed cloud database, without functional loss. Each candidate is migrated under the same parallel-running and reconciliation discipline we apply everywhere, so cost reduction never comes at the expense of data integrity. Because savings depend entirely on your current footprint, we size them during the audit phase and present them before any commitment, rather than promising a figure up front.

We migrate in stages, by client segment or workload, never in a single big-bang cutover. The sequence is planned during the audit so the lowest-risk workloads move first and the team builds confidence on real data before touching the most critical flows. Each stage is validated and reconciled against the legacy system, output by output, before it is moved permanently. Because the legacy and target systems run in parallel during this window, the impact of any issue is contained to the segment being migrated, and a rollback affects only that segment. For a full enterprise migration from a legacy Oracle or SAP estate, expect the program to span several months of phased moves rather than a single release. This keeps high-volume, transaction-critical environments available throughout the migration cycle.