Mainframe Modernization Without Losing Control
For Nordic and Baltic banks, mainframe modernization is about control, not replacement. As regulatory, security and cost pressures grow, technology leaders need a data-driven, low-risk approach that preserves stability while enabling progress, a view also highlighted in Kyndryl’s State of Mainframe Modernization.
In many mid-sized banks, the mainframe is not a legacy problem to remove, but a foundation that must be understood, governed, and carefully evolved. Modernization pressure is real: Customer expectations, compliance requirements, cybersecurity risks, and cost efficiency all demand change. At the same time, core banking systems must remain stable, resilient, and continuously available.
“Industry analysis shows that modernization is no longer a question of if, but how, and at what risk level. At Samlink, we see the same pattern in the market. Successful modernization is rarely driven by bold replacement strategies. Instead, it is built on controlled progress, transparency and deep system understanding”, says Pål Krogdahl, Samlink’s CTO.
Modernization as a Risk Management Exercise
Large transformation programs fail most often not because of technology limitations, but because of blind spots. Hidden dependencies, undocumented processes and fragmented vendor responsibilities increase risk precisely when visibility is most needed. In complex SIAM environments, even small changes can become unpredictable without end-to-end transparency.
Modernization must therefore start with clarity: What runs on the mainframe today, which services are business-critical, and where the real bottlenecks lie, whether technical, operational or organizational. Without this baseline, ROI remains theoretical and investment decisions are difficult to justify.
Kyndryl’s research highlights that organizations achieving measurable results prioritize visibility and data-driven decision-making before transformation. Samlink’s experience aligns closely with this: trust-preserving modernization starts with transparency.
Stability First, Change Second
For regulated financial institutions, stability is not a conservative preference, it is a strategic requirement. Core banking systems must meet strict standards for availability, security, and compliance. Treating the mainframe primarily as a risk rather than a strategic asset introduces unnecessary exposure.
A controlled modernization path allows banks to retain proven core capabilities while modernizing interfaces, tooling, and observability layers. Automation, analytics, and improved developer experience can be introduced incrementally, without destabilizing production environments.
“This approach supports cost optimization and resilience while maintaining operational confidence, a key priority for technology leaders accountable to both regulators and the business”, Pål states.
Observability as a Foundation for Trust
One of the most important enablers of low-risk modernization is end-to-end observability. Modern banking platforms span mainframe, distributed systems, cloud services, and multiple vendors. Without a unified operational view, complexity is managed through assumptions rather than facts.
Improved observability enables faster incident detection, predictable change management, evidence-based vendor coordination, and clearer communication with business stakeholders. In practice, observability is not just a technical capability but a governance tool that reduces uncertainty and supports informed executive decision-making.
The challenge for technology leaders is not choosing between legacy and modern systems, but building an environment where both can coexist, evolve, and deliver value. Banks that succeed will be those that maintain control over complexity, invest in visibility and understanding, prioritize resilience over speed, and choose partners who value stability as much as innovation.
“Modernization does not require betting the bank. It requires clarity, patience and step-by-step progress”, Pål concludes.