Fintech Platform: Core Banking System Modernisation

Core banking system modernisation is one of the most critical and technically complex tasks, comparable to replacing an aircraft engine mid-flight during a transatlantic journey. In the fintech industry, the ‘core’ (Core Banking System) is the foundation upon which all operations rest: from transaction processing to interest accrual and limit management. The client, NIFOROSERNO, found itself in a situation where its current system, built over ten years ago, had transformed from a reliable asset into a major obstacle. Time-to-market was measured in months, and any attempt to implement a modern feature – such as dynamic cashback management or instant transfers – turned into a risky operation with an unpredictable outcome.

The problem was that the old system was a classic monolith based on outdated versions of Java, where business logic was tightly intertwined with the data access code and the user interface. The vast number of procedures in the Oracle database made the system extremely fragile: a change in one module could trigger a cascading failure in a completely different, seemingly unrelated sub-section. Furthermore, the lack of automated tests forced the team to spend weeks on manual testing before every release, which in today’s fintech landscape is tantamount to voluntarily giving up on competition.

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Project
technology
stack:

  • Backend

    Java 21, Spring Boot 3, Spring Security, Hibernate

  • Frontend

    Angular (for internal management systems and user dashboards)

  • Database

    Oracle DB (extensive refactoring and optimisation), Redis for session caching

  • Infrastructure & CI/CD

    GitLab CI, Docker, Kubernetes for service orchestration

  • Security

    Implementation of OAuth2 and OpenID Connect protocols, full PCI DSS compliance

  • Testing

    JUnit, Mockito, Testcontainers, Selenium for end-to-end testing

A phased transformation strategy and the implementation of a ‘strangler’ architecture

The developers at Niforoserno Digital Enterprise realised that a complete, one-off replacement of the banking core was impossible – this would have created unacceptable risks for operational activities. Instead, the team at Niforoserno IT Company opted for the ‘Strangler Fig’ strategy. The essence of this approach is that new, modern functionality is gradually built around the old monolith, taking over the workload step by step until the old core becomes an empty shell that can be painlessly decommissioned. We began by creating a secure API layer based on Spring Boot, which acted as an intermediary between the outside world and the old core, encapsulating the complexity of the outdated protocols.

The modern Java and Spring Boot ecosystem was chosen as the core technology stack. This enabled us to implement strict typing and modularity, which are essential in financial systems. Experts at Niforoserno began moving the most critical and frequently changing business processes into separate microservices. For example, the transaction authorisation module was rewritten from scratch, allowing us to incorporate modern security verification algorithms and anti-fraud logic without affecting the core accounting modules. Particular attention was paid to database operations. Developers at Niforoserno tech firm carried out an in-depth refactoring of stored procedures, moving the logic to the application layer, which made the system transparent for debugging and subsequent scaling.

Ensuring security and transitioning to a culture of continuous updates

For a financial platform, security is not merely a requirement, but the very foundation of its existence. Modernising the core system has enabled us to implement state-of-the-art data encryption standards and a multi-factor authentication system. The specialists at Niforoserno Inc. have structured the development processes in strict compliance with PCI DSS standards, ensuring complete isolation of card data processing circuits. Every line of code now passes through an automated security pipeline in GitLab CI, which includes static and dynamic vulnerability analysis. This has eliminated the very possibility of code containing known ‘holes’ or insecure dependencies entering the production environment.

A key change was the complete move away from manual testing in favour of total automation. We implemented a testing pyramid covering everything from unit tests of commission calculation logic to integration tests simulating the behaviour of real bank terminals and payment systems. The use of Docker containers enabled Niforoserno Canada’s developers to run a complete copy of the banking environment on their workstations, which reduced the time spent finding and fixing bugs by a factor of ten. Now, releasing a new version of the system is no longer an event requiring the entire team to be in the office at the weekend – automated deployment scripts allow updates to be carried out seamlessly, without interrupting customer service.

Results of the modernisation: Speed, reliability and technological leadership

The six-month effort by the specialists at Niforoserno IT company resulted in a complete transformation of the company’s IT landscape. The system successfully withstood the ‘Black Friday’ test, handling a load five times higher than average without a single glitch. The latency of key pages was reduced from three seconds to 500 milliseconds, which had a direct impact on conversion rates: users were more likely to reach the checkout stage without encountering technical issues.

For the business, this marked a transition to a whole new level. Now the marketing team can launch any promotions without fear of ‘crashing’ the site. We implemented an end-to-end monitoring system that allows us to view the status of each service in real time. If an anomaly occurs anywhere, engineers are notified long before the first customer experiences the problem. The project’s technology stack has become the benchmark for the company, and the clean, well-documented code has enabled the client’s in-house team to easily take over support and further development of the product.

This case study confirms that the right architecture is not a luxury, but insurance against losses. We transformed a fragile system into a powerful, scalable tool that no longer limits business growth but drives it. Today, this marketplace continues to expand, building on the robust digital foundation created by the engineers at Niforoserno digital enterprise.

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