Escaping the $25 Billion Legacy Constraint
The industry is at a tipping point
Core banking is undergoing a structural shift. The global core banking technology market is projected to grow from approximately $13–14 billion in 2025 to $23–24 billion by 2030. At the same time, analysts estimate a $25 billion opportunity in legacy core modernization during this period, with nearly 60% of financial institutions already planning transformation initiatives.
For US regional banks, the pressure is even more immediate. Cost to income ratios is expected to rise to nearly 74% by 2030 if current operating models persist, up from about 63% in 2023. Today, most banks still allocate close to 70% of their IT budgets on maintaining legacy systems rather than building new capabilities. Meanwhile, fintechs continue to launch products in weeks and regulators demand near real-time reporting.
The question is no longer whether to modernize. The priority is how to modernize without disrupting business stability.
Beyond “rip and replace”: Rethinking core transformation
Traditional core transformation programs have relied on full platform replacement. These large-scale initiatives typically require multi-year timelines, significant upfront investment and a single, high risk cutover event. Industry experience shows that such approaches frequently lead to cost overruns, delays and operational disruption.
A more effective path is progressive modernization that enables banks to evolve their core systems incrementally. By separating business capabilities from legacy platforms, institutions can modernize in phases, reducing risk while accelerating innovation.
Persistent adopts a co-existence-led approach built around the LEAP framework:
- Leverage Assess the current landscape and identify opportunities to decouple legacy components
- Envision Define a target state aligned with business priorities and growth objectives
- Architect Design a composable, API-first and cloud-native foundation
- Propel Execute transformation in controlled phases with parallel runs and minimal disruption
This approach allows regional banks to adopt modernization strategies tailored to their needs from digital overlays to fully composable core transformations without compromising continuity.
From technology upgrade to growth platform
Modernization today is not only about replacing technology. It is about building a platform that enables growth, agility and new revenue models.
Persistent brings a platform-first mindset to core transformation, combining deep domain expertise with proven global experience. With 1,100+ digital banking specialists, 15+ Gen3 core implementations and over 100 lending and deposit products delivered, persistent helps banks accelerate transformation outcomes while reducing execution risk. This expertise translates into tangible value:
- Faster transition to cloud-native, API-driven core platforms
- Accelerated modernization through GenAI-led efficiencies
- Up to 2.5x faster time to market and up to 40% reduction in total cost of ownership through the Persistent Digital Bank Solution
- Flexible, scalable architectures enabled by the 3P model – Product, Platform and Providers
Persistent’s long-standing partnership with Mambu further strengthens this approach, combining a cloud-native SaaS core with deep engineering and domain expertise to deliver scalable, measurable outcomes.
Delivering measurable business impact at scale
Core modernization programs must deliver clear outcomes. Persistent’s work with League Data demonstrates what is possible.
League Data, which supports credit unions across Atlantic Canada, needed to migrate 37 Credit Unions from a legacy system nearing end of life. Persistent partnered with Mambu to deliver a large-scale transformation.
The results were significant:
- Upto 99.9% platform uptime
- Credit union onboarding reduced from 6–9 months to 4–6 weeks
- 30–50% reduction in operating costs through shared services
- 500+ integration services across 20+ ecosystem partners
- 900+ automated reports delivered with zero downtime cutovers
Beyond this program, Persistent has delivered impactful outcomes across global markets, including:
- Helped a bank launch an independent BPaaS company now licensing the platform to banks and building societies in the UK
- Built and launched a fully licensed digital bank from scratch in just 8 months
- Core modernization and digital engineering programs for Tier 1 banks across the US and Asia Pacific
The window to act is narrowing
The opportunity in core modernization is significant, but so is the urgency. Regional banks that adopt a phased, platform-driven approach can reduce cost pressures, accelerate innovation and remain competitive in a rapidly evolving market.
Progressive modernization enables banks to transform without disruption, unlocking value at each stage while maintaining business continuity.
Start your modernization journey
Modernization does not have to mean disruption. With the right strategy, banks can transition from legacy constraints to a future-ready, composable core while continuing to operate with stability and confidence.
Persistent helps regional banks achieve this transformation through a structured, low-risk, outcome-driven approach focused on measurable outcomes.
Explore how to modernize your core banking platform without disruption. Visit Banking and Financial Services or connect with our experts to begin your modernization assessment.
Author Profile
Rajesh Stephen
Associate Vice President, Domain Consulting at Persistent System
