Core Modernization for Mid-Tier and Challenger Banks Serving SMEs

Mid-tier and challenger banks serving small and medium-sized enterprises face a difficult balancing act. SME customers increasingly expect the speed, simplicity and always-on access they experience elsewhere in digital finance. At the same time, many banks are still carrying legacy core environments that slow product launches, fragment customer data and increase the cost of change. For institutions that do not have the budget, time or risk appetite for a wholesale core replacement, the question is not whether to modernize. It is how to do it pragmatically.

Publicis Sapient helps banks modernize incrementally, focusing first on the domains that matter most to growth, efficiency and customer relevance. Working with composable, cloud-native core banking platforms such as Tuum, we help institutions move away from inflexible legacy estates and toward a more adaptable operating model—without turning modernization into a multi-year burden.

Why SME-serving banks need a different modernization path

Banks serving SMEs are under pressure from multiple directions. Digital-first competitors are raising expectations with seamless onboarding, faster service and more flexible products. Regulatory obligations remain strict. Cost pressure is persistent. And internal teams are often asked to deliver more innovation with limited resources.

For these banks, traditional transformation programs can feel mismatched to the problem. A large-scale rip-and-replace core program may promise a future-state architecture, but it can also introduce major cost, delivery and operational risk. More importantly, it can delay the business outcomes that matter now: launching products faster, reducing maintenance spend, improving access to data and creating a more unified experience for business customers.

A composable modernization strategy offers a more realistic path. Instead of forcing the organization into one massive migration event, banks can prioritize the capabilities that will create value earliest and build momentum from there.

Modernize the domains that matter most

The advantage of modular core transformation is choice. Rather than attempting to change everything at once, banks can target the areas with the clearest impact on SME growth and operational performance.

Onboarding that removes friction

For SME customers, slow and fragmented onboarding is more than an annoyance—it can be a reason to switch providers. Modernizing onboarding journeys helps banks reduce friction, improve task completion and create more accessible digital entry points for new customers. Publicis Sapient brings together strategy, journey design and engineering to simplify these moments while ensuring they are built on stronger underlying systems.

Faster product launch velocity

Many banks know what products their SME customers need; the challenge is getting them to market quickly enough. Modular core platforms make it easier to configure and launch new offerings without waiting on large-scale platform overhauls. This supports a faster move from idea to deployment and gives banks more room to test, learn and evolve their propositions.

Unified accounts and a better customer view

A recurring challenge in SME banking is fragmentation across account types, channels and servicing models. Publicis Sapient has helped banks create customer-first platforms that connect different account types and allow customers to manage them in one place. This kind of account unification supports better experiences for SMEs while also giving the bank a stronger foundation for cross-sell, service and insight.

Better access to data

Data accessibility is a critical enabler of modern banking. When information remains trapped in legacy silos, banks struggle to personalize experiences, improve decision-making or use AI effectively. A composable core environment makes it easier to connect platforms, expose data and create the real-time visibility needed for both customer-facing innovation and internal efficiency.

Operational efficiency without destabilizing the business

For many mid-tier and challenger banks, modernization must improve economics as well as experience. Legacy estates often consume too much budget in maintenance and manual workarounds. By shifting selectively to modular, cloud-native components, banks can lower maintenance spending, simplify change and create a more scalable technology foundation without disrupting the entire business.

Incremental transformation, not a forced reset

One of the biggest barriers to core modernization is the belief that everything must change at once. In practice, successful transformation often depends on coexistence: modern and legacy environments operating together while the bank migrates capability by capability.

This is especially important for institutions with limited resources or lower tolerance for operational risk. An incremental approach allows the bank to deliver visible business outcomes early, prove value as it goes and maintain control over sequencing. It also gives leadership teams the flexibility to align modernization decisions with commercial priorities instead of treating technology change as a standalone program.

With modular platforms such as Tuum, banks can select the transformation areas that matter most, reducing both development time and cost. That creates a more credible path to modernization for institutions that need progress now, not just a long-term end state.

From composable core to practical growth strategy

Technology alone does not create transformation. To turn composable banking into a growth play, banks need a partner that can connect architecture decisions to customer outcomes, operating model change and delivery execution.

This joined-up model matters because core modernization is not only a platform decision. It is a business transformation effort that touches product development, customer experience, compliance, operations and data.

Proven ways to move faster

Publicis Sapient’s work in financial services shows what is possible when banks combine modern core technology with focused execution. In one case, a leading Thai bank sought not simply a new app, but a new business model and a technical foundation that would allow it to adapt, innovate and bring products to market quickly. A multidisciplinary team built a front-to-back banking platform connecting mobile, payments and real-time data in just 12 weeks, while supporting strict internal and regulatory requirements. The result was a stronger base for rapid product delivery and long-term cost and operating model improvement.

That same principle applies to SME-serving banks: modernization works best when it is tied to concrete outcomes, delivered iteratively and supported by a roadmap for continuous evolution.

A smarter path for banks that cannot afford to wait

For mid-tier and challenger banks serving SMEs, the choice should not be between standing still and taking on an oversized transformation program. There is a third path: modular modernization that prioritizes the capabilities with the greatest business impact and builds from there.

With Publicis Sapient, banks can approach core transformation in a way that is faster, safer and better aligned to their economic reality. By combining strategy, product, engineering and execution with composable core banking platforms like Tuum, we help institutions modernize incrementally, improve operational efficiency and deliver the connected, digital-first banking experiences SMEs increasingly expect.

The result is not modernization for its own sake. It is a more practical route to growth, agility and long-term competitiveness.