Core modernization in banking and payments without slowing the business

Banks and payments providers do not have the luxury of pausing the business while they modernize it. Core platforms, lending systems and tightly coupled transaction engines still power critical products, controls and customer experiences every day. The challenge is not simply replacing old technology. It is preserving the business logic, approval flows, exceptions, controls and release confidence that have accumulated over years of operating in a regulated environment.

Sapient Slingshot helps financial institutions modernize complex legacy systems while continuing to launch products, serve customers and run the business with confidence. It is an enterprise AI development and modernization platform designed to accelerate the full software development lifecycle, from discovery and planning through code generation, testing, deployment and support. For banking and payments organizations, that means modernization can move faster without turning critical systems into black boxes or forcing teams into risky rewrite-from-scratch programs.

Modernize the core without losing what makes it work

In many institutions, critical business rules are buried deep in legacy code, undocumented fixes, SME knowledge and tightly coupled process flows. That is especially true across deposit platforms, lending systems, transaction processing environments and integration-heavy payment architectures. Traditional modernization approaches often struggle here because they jump too quickly from old code to new code, leaving teams to rediscover rules and dependencies by hand.

Sapient Slingshot takes a different approach. Modernization starts by reading the existing system, extracting rules, dependencies and behaviors, and turning them into verified, reviewable specifications before modern code is generated. This specification-led flow creates a clear path from code to spec, spec to design and spec to code. By making hidden logic explicit first, teams can reduce guesswork, lower rework and preserve the business fidelity that matters most in regulated environments.

For banking and payments leaders, that continuity is essential. Modernized systems need to behave as intended across calculations, validations, workflows, approvals, controls and downstream integrations. Slingshot is built to carry that logic forward through design, code generation, testing and deployment so transformation can happen with stronger traceability and control.

Built for enterprise context, not isolated code generation

Generic AI coding tools can speed up individual tasks, but banking modernization requires more than faster code completion. It requires system-level understanding. Sapient Slingshot uses an enterprise context graph to ground modernization and development work in how the institution actually operates. This living map connects data, logic, workflows, repositories, specifications, dependencies, user journeys and operational context so teams do not have to rebuild understanding at every handoff.

That persistent context matters when a change to a core transaction flow can affect servicing, reporting, risk controls, audit evidence or customer communications. With shared context across discovery, planning, design, engineering, testing and release, Slingshot helps teams modernize with a clearer view of business impact and dependency risk.

The result is a more connected delivery model. Instead of fragmented tools and handoffs that lose context along the way, institutions can align modernization with backlog creation, sprint planning, code transformation, quality automation and deployment workflows in one governed system.

Human-in-the-loop governance for regulated delivery

Speed alone is not enough in financial services. Governance, auditability and release confidence have to travel with the work. Sapient Slingshot is designed as a human-in-the-loop platform, not a black-box automation engine. Architects, engineers, product leaders and domain experts remain central to validating outputs, reviewing specifications, inspecting traceability and approving release decisions.

That governance model is supported by built-in authentication, traceability and compliance-minded workflows. Prompts can be managed as reusable enterprise assets. Outputs remain reviewable. Validation steps and lifecycle continuity help create a clearer chain of custody from requirement to specification to code to release. For banks and payments providers, this supports modernization that is faster without weakening the controls required for regulated software delivery.

This is also where Slingshot stands apart from point solutions. It is designed to improve continuity and confidence across the lifecycle, not just generate code in isolation. Governance is embedded into the way work flows, from planning and architecture through testing, CI/CD and deployment.

Keep shipping while transformation is underway

One of the biggest barriers to core modernization is the fear that transformation will absorb the organization and stall innovation. Sapient Slingshot is built to support modernization and net-new software development on the same platform. Teams can modernize legacy applications while continuing to build and launch new products, services and capabilities.

That matters in banking and payments, where institutions cannot wait years for long transformation programs to finish before responding to new market demands. Slingshot helps connect requirements, backlog items, specifications, code, tests and deployment steps so delivery can continue while legacy systems catch up. In lending scenarios, it can translate business intent into workflows, code, tests and deployment-ready outputs with enterprise-grade quality and controls. In broader modernization programs, it helps institutions keep moving without sacrificing release readiness.

Flexible deployment for control-sensitive environments

Banking and payments organizations operate under different infrastructure, security and operating-model constraints. Sapient Slingshot is designed to fit those realities. It can be deployed as secure SaaS in a private cloud, on-premises or through a hybrid managed-services model. That deployment flexibility helps institutions modernize within their own environment boundaries and align with existing technology, security and governance requirements.

Slingshot also integrates with existing toolchains and workflows rather than forcing teams to start over. It supports common developer environments, project management tools, major cloud providers and leading model ecosystems, making it easier to work within established enterprise delivery landscapes.

Modernization outcomes that matter to financial institutions

Sapient Slingshot is trusted across more than 100 enterprise customers and is associated with measurable outcomes that are highly relevant to banking and payments transformation. Publicis Sapient cites up to 95% accuracy in business rule extraction, up to 85% first-time pass rates for generated code, up to 99% code-to-spec accuracy, around 40% productivity gains, up to 50% reduction in modernization costs and modernization delivered up to 3x faster than traditional approaches. After modernization, organizations have also seen up to 5x increases in velocity for new feature releases and up to 80% less expert time required to support modernization work.

There are banking-relevant proof points as well. In one example, a multinational bank accelerated legacy migration to its private cloud, modernizing 50% faster at 30% of the cost of traditional approaches. In lending-focused examples, work that would traditionally take weeks can be completed in hours or minutes, helping teams move from business intent to production-ready delivery far more efficiently.

These outcomes reinforce a simple point: modernization does not have to be slower to be safer. With the right specification layer, enterprise context, governance model and deployment flexibility, banks and payments providers can modernize core systems with more speed and more control at the same time.

Why Sapient Slingshot for banking and payments

Sapient Slingshot is built for the institutions facing the hardest modernization challenge: organizations with tightly coupled systems, hidden business logic, demanding compliance requirements and no appetite for business disruption. It helps banks and payments providers preserve what matters, modernize what is holding them back and continue delivering value throughout the transformation journey.

Modernize legacy cores, lending platforms and transaction systems with confidence. Keep the rules, controls and continuity that run the business. And keep shipping while the foundation evolves.