Legacy system modernization without the gamble
Oracle, SAP, legacy billing, your enterprise infrastructure runs on systems built 15 years ago. We modernize legacy systems without breaking what works: no big bang migrations, no theoretical roadmaps, just hands-on engineering from a team that has spent two decades building and maintaining mission-critical platforms processing hundreds of millions of euros monthly.
Trusted by Europe’s
leading organizations
In tech, true autonomy strengthens bonds. By transferring knowledge and best practices, we enable independence while forging long-term partnerships, earning the trust of Europe's premier organizations.
.svg)
Let the numbers speak for DNA Solutions
We tailor technology to your business goals. Our enterprise clients trust us to cut operational costs, boost efficiency, and strengthen infrastructure resilience through smart engineering.
Annual savings for one client
By optimizing Oracle licensing for a major European organization, we delivered over €1M in yearly cost savings.
Daily invoices processed
We built and maintain a Deloitte-audited billing platform processing €300M in transactions every month.
Engineers & Consultants
Our experience spans the design of mission-critical systems for Oracle and telecoms across India, Dubai, and Europe.
Average client relationship
T-Systems, Sattelic, European Commission... our longest clients keep coming back because we deliver, not because we lock them in.
Why DNA Solutions for legacy modernization
Most modernization projects fail because the team underestimates what's inside the box. Legacy systems in production for 10-15 years carry undocumented business logic, custom workarounds, and integration points nobody remembers writing. DNA Solutions has spent two decades building and maintaining these systems, not advising on them. That hands-on experience changes everything about how we scope, plan, and execute modernization: we don't discover edge cases six months in, we anticipate them during the initial assessment.
We know where they break
Our team has architected billing platforms processing hundreds of millions of euros monthly, done Oracle licensing audits that recovered over €1M in annual costs, and migrated SAP integrations while both systems stayed live. That operational depth changes the nature of the work, we anticipate edge cases during scoping because we've seen them before in production environments under real load. Your modernization benefits from every migration, optimization, and incident we've handled across two decades.
Our approach: pragmatic, phased, no surprises
Legacy modernization fails when teams treat it as a greenfield project. It's not. The constraints are real: business logic buried in stored procedures, integrations nobody documented, and operations that can't pause while you rebuild.
Structured licensing audits that map real Oracle usage against entitlements. We identify consolidation opportunities, unused licenses, and optimization paths that reduce annual costs, often by six figures or more.
Oracle licensing is a minefield of complex rules around processor metrics, virtualization, and cloud deployment. Most organizations overpay significantly without realizing it. Our audits examine every aspect: actual CPU utilization, named user allocations, option and pack usage, and virtualization compliance. We've recovered over €1M for a single client and typically find 20-40% savings potential in every audit we conduct.
Telecom and utility billing systems accumulate dangerous technical debt. We rebuild billing engines from the inside, migrating business logic module by module while keeping production live and revenue flowing.
Billing system modernization is uniquely challenging because every edge case represents real money. Prorated charges, bundled discounts, usage-based tiers, regulatory surcharges, all of it encoded in legacy code that nobody wants to touch. We document every rule before migrating it, validate with parallel processing, and only cut over when the new system matches the old one transaction-for-transaction. Zero revenue impact, zero customer disruption.
Middleware that connects SAP with modern APIs, AFAS, custom ERPs, and cloud services. We handle data synchronization, error recovery, format translation, and audit logging across your entire integration layer.
SAP integration is notoriously complex, IDocs, BAPIs, RFC connections, and proprietary data formats that don't map cleanly to modern standards. Our middleware solutions abstract this complexity behind clean APIs, handle format translation automatically, and provide complete audit trails for compliance. We've built integration layers that process millions of transactions daily with built-in retry logic and real-time monitoring.
Every migration stage includes explicit rollback procedures. We build and validate the new environment against real data while legacy stays live. Cutover happens only when every validation gate is passed.
Zero-downtime migration requires meticulous planning: parallel environments, real-time data synchronization, comprehensive testing at every stage, and rehearsed cutover procedures with documented rollback steps. We've developed this methodology over dozens of enterprise migrations. Your team participates in every decision point, no surprises, no unilateral actions, no hoping for the best.
Questions about legacy modernization
Legacy modernization carries real risk. These are the questions decision-makers ask us before signing.
Most firms that claim legacy expertise have read about these systems. DNA Solutions has built and maintained them in production, Oracle billing stacks processing €300M monthly, SAP integration layers, telecom charging engines, for clients where failure means revenue loss in real time. When we scope a modernization project, we estimate complexity accurately because we've seen the same patterns dozens of times across 20 years.
DNA Solutions runs parallel environments: the legacy system stays live while we build, validate, and performance-test the new platform against real data. Before any cutover, we run parallel processing where both systems handle identical transactions simultaneously, and we compare outputs transaction-by-transaction. Only when results match consistently do we proceed, this methodology has been refined across dozens of enterprise migrations over two decades.
At DNA Solutions, simple integrations and Oracle optimization projects run 2-4 months, our Oracle licensing audit that recovered €1M took three months from kickoff to realized savings. Full billing platform migrations typically run 6-18 months in phased delivery. We don't quote timelines before we've seen the system: DNA Solutions invests 2-4 weeks in hands-on assessment first, because the real complexity always lives in the code, not the documentation.
Yes, and at DNA Solutions, we recommend this approach for most legacy environments. AI capabilities like predictive analytics and anomaly detection are layered onto existing infrastructure via API layers and data pipelines, without modifying your source systems. Your legacy systems contain decades of valuable operational data, and DNA Solutions builds extraction pipelines that feed this information to AI models while keeping your production systems unchanged.