AI-Driven Software Development in Banking and Payments
Banking and payments organizations face a difficult balancing act. They need to modernize core systems, migrate to the cloud, launch new digital products faster and respond to changing customer and market demands. At the same time, they cannot afford to lose the business rules, operational logic and compliance-sensitive processes embedded in legacy platforms. For many institutions, that is the real constraint: not a lack of ambition, but the risk of changing systems that still run the business.
Publicis Sapient helps banks and payments providers move through that tension with greater speed and control. Using Sapient Slingshot, our AI-powered software development and modernization platform, we accelerate work across the full software development lifecycle while preserving critical business logic and enterprise context. The result is not just faster coding. It is a more connected, governed and scalable way to modernize core systems, integrate with legacy environments and deliver new software that is production ready.
Modernize the core without rewriting the bank from scratch
In banking, legacy systems often contain decades of policy logic, workflow rules, product structures and operational dependencies. Traditional rewrite approaches can put that knowledge at risk because too much of it is undocumented or trapped in tightly coupled code. Slingshot takes a different path. It reads existing systems, extracts rules and dependencies, converts them into verified specifications and uses those specifications as the source of truth for modernization.
This specification-led approach helps institutions preserve behavior while moving toward modern architectures. It reduces guesswork, lowers rework and creates stronger traceability from original systems to modern output. For banks modernizing mainframe or COBOL-based environments, refactoring monolithic applications or migrating legacy services to cloud-native architectures, that matters. It means modernization can proceed faster without sacrificing control.
Publicis Sapient has used this model to help a multinational bank accelerate legacy migration to its private cloud, modernizing 50% faster at 30% of the cost of traditional approaches. By reducing the cost and duration of modernization, the bank was able to free up budget for innovation and create a stronger foundation for future change.
Preserve critical business logic while opening the door to new products
Banks do not have the luxury of pausing delivery while modernization happens in the background. They need to keep launching products, improving experiences and responding to new opportunities even as core systems evolve. Slingshot supports both modernization and net-new software development on the same platform, so institutions can transform the foundation and build on top of it at the same time.
Because Slingshot carries enterprise context across planning, design, development, testing and deployment, teams do not have to repeatedly reconstruct how the business works. Requirements can be translated into delivery-ready backlog items. Architecture and design can be generated with awareness of existing systems and dependencies. Code, tests and deployment workflows can stay aligned to the same underlying business context. That continuity helps banks move faster while maintaining confidence in the outputs.
For financial institutions, this is especially valuable in areas where product logic and operational workflows are deeply interconnected. Lending is a clear example. A commercial bank can define a lending management application in natural language, and Slingshot can generate the workflow, produce the code, execute tests and make the application live with enterprise-grade quality and controls. What would traditionally take weeks can be completed in hours or minutes, helping teams bring new internal tools and customer-facing capabilities to market much faster.
Accelerate high-value banking use cases
AI-driven software development becomes most valuable when applied to banking use cases where speed, precision and continuity all matter.
- Lending applications: Build and evolve systems for loan processing, review, validation and approval with faster turnaround from concept to live application.
- Core modernization: Extract logic from legacy banking platforms and transform it into modern, cloud-ready services without losing the rules the business depends on.
- Cloud migration: Move legacy code and applications to private cloud or modern environments with stronger context, governance and reduced migration risk.
- Legacy core integration: Launch new digital experiences and products that integrate with existing systems instead of waiting for a full core replacement.
- Testing and release acceleration: Expand test coverage, improve quality and speed the path from requirement to production-ready software.
These are not isolated engineering gains. They directly affect business performance by reducing modernization drag, improving product responsiveness and making change easier to execute across the organization.
From faster SDLC to measurable business outcomes
For banking leaders, delivery speed matters only if it translates into better business outcomes. Publicis Sapient’s approach is designed to do exactly that.
With Slingshot, banks can reduce modernization costs by up to 50%, achieve up to 99% code-to-spec accuracy and improve engineering productivity by around 40%. In broader delivery contexts, teams can realize significant time savings through automated code generation, faster backlog creation, stronger testing automation and more connected delivery workflows. Digital services that once took months to build can launch in weeks. What once took weeks in a lending workflow can be completed in hours or minutes.
That acceleration supports outcomes banking executives care about: faster product launch, lower modernization cost, more predictable delivery, reduced technical debt and improved readiness for regulatory, customer and market-driven change. It also helps institutions redirect spend away from maintenance and toward innovation.
Part of a broader banking transformation journey
Slingshot is powerful on its own, but it is even more valuable as part of a broader transformation model. Publicis Sapient helps financial institutions connect modernization, new product development and ongoing operations into one more intelligent delivery system.
That journey can start with legacy modernization and cloud migration, where buried business logic is surfaced and converted into governed, reusable assets. It can continue into net-new development, where teams use AI-assisted agile delivery to build apps, services and experiences faster with the right enterprise context. And it can extend into run and support, where AI-based managed services shift IT operations from manual processes to always-on autonomous services.
In practice, that means support models can evolve as well. Ticket-based service requests can be handled by autonomous agents. Level 1 and Level 2 support can move toward self-help and self-heal capabilities. Operations teams gain visibility into agents, costs and performance across the environment. The result is not only faster delivery, but a smarter operating model for the applications after they go live.
Why this matters for banking and payments leaders
The future of banking will not be built by replacing every system at once. It will be built by modernizing intelligently, preserving what still matters and accelerating what comes next. Publicis Sapient helps banks and payments providers do that with a governed, AI-driven approach to software delivery.
With Sapient Slingshot, institutions can modernize core systems faster, integrate legacy and modern environments more effectively, launch new products sooner and create a stronger foundation for ongoing change. That is how banking organizations move from technical debt and delivery friction toward a more adaptive, future-ready enterprise.