The Good Tech Companies - Scalable, Compliant, Cloud-Native: The FINRA CAT Reinvention by Saravanan Thirumazhisai Prabhagaran

Episode Date: October 4, 2025

This story was originally published on HackerNoon at: https://hackernoon.com/scalable-compliant-cloud-native-the-finra-cat-reinvention-by-saravanan-thirumazhisai-prabhagaran. Discover how Saravanan Thirumazhisai Prabhagaran modernized FINRA’s CAT system into a scalable, cloud-native, cost-saving regulatory technology platform. Check more stories related to tech-stories at: https://hackernoon.com/c/tech-stories. You can also check exclusive content about #saravanan-prabhagaran, #finra-cat-modernization, #cloud-native-regulatory-tech, #presto-migration-architecture, #financial-market-surveillance, #aws-graviton-regulatory-tech, #open-source-presto, #good-company, and more. This story was written by: @sanya_kapoor. Learn more about this writer by checking @sanya_kapoor's about page, and for more stories, please visit hackernoon.com. Saravanan Thirumazhisai Prabhagaran led the reinvention of FINRA’s CAT system, transforming it into a scalable, cloud-native platform. By shifting from costly proprietary tech to open-source Presto and AWS-native infrastructure, he cut $2.1M annually in costs, boosted query performance 300%, and set new standards for regulatory technology modernization.

This audio is presented by Hacker Noon, where anyone can learn anything about any technology. Scalable, compliant, cloud-native, the FINRA CAT reinvention by Saravan and Thirumazesai Prabagarin, by Sanya Kapoor. In the unforgiving world of financial regulatory technology, where system failures can compromise market integrity and cost millions in penalties, few challenges are as daunting as transforming the backbone of national market surveillance infrastructure. The remarkable metamorphosis of FINRA's CAT, Consolidated Audit Trail. System stands as a compelling testament to visionary leadership and strategic architectural thinking. Under the expert guidance of Saravan and Therumasi Prabagarin, this mission-critical initiative transformed from a costly, proprietary system

into a scalable, cloud-native platform that redefined regulatory technology standards. The project encompassed two cornerstone components of FINRA's market surveillance infrastructure, the external CAT Metastore Service, ECMS, serving as a centralized metadata registry for regulatory event lineage and schema tracking, and the CADBDSQL query engine, utilized by the SEC and others take holders to investigate and analyze massive volumes of market events. When Saravan and Thirumazizai Prabagarin assumed architectural leadership of this complex initiative, he faced the monumental task of transitioning these systems from legacy and proprietary implementations to modern, scalable platforms while maintaining uninterrupted service to critical

regulatory operations. Confronting legacy system limitations, the challenges were both immediate and systemic. The existing infrastructure, built on proprietary starburst solutions and increasing costs, was straining under the ever-increasing demands of modern financial markets. Annual licensing costs were escalating unsustainably, while performance bottlenecks threatened the system's ability to handle the 15 to 20% annual growth in market data volume. Most critically, the rigid, monolithic architecture prevented the seamless integration of new analytical tools desperately needed by regulatory bodies Toki Pace with increasingly sophisticated trading activities.

Saravan and Thirumazizai Prabagarin recognized that this was not merely a technical upgrade but a fundamental reimagining of how regulatory technology could serve market surveillance. His approach centered on three core principles, architectural decoupling for maximum flexibility, open-source adoption for cost efficiency and innovation, and cloud-native design for unlimited scalability. Strategic architectural revolution at the heart of this transformation was Saravan and Therumazizai Prabagarin's innovative approach to system architecture. For the ECMS component, he implemented a revolutionary decoupled model that separated compute, catalog, and storage functions, enabling optimal elasticity and resource optimization. This architectural philosophy

represented a dramatic departure from traditional monolithic approaches, allowing each component to scale independently based on-demand patterns. The most ambitious aspect of the project involved directing the complete transition of CADBDSQL from the proprietary Starburst solution to open source Presto. This transition required extensive compatibility benchmarking and careful orchestration to ensure zero disruption to ongoing regulatory operations. Saravan and Therumazizai Prabagarin personally oversaw every aspect of this migration, conducting deep performance analysis and establishing comprehensive testing protocols to guarantee seamless functionality. Innovation through integration, the technical complexity of integrating multiple

cloud-native services required both strategic vision and meticulous execution. Saravanan Therumazisai Prabagarin orchestrated the seamless integration of Ammitteran. Amazon S3, Hive Metastore, and AWS native infrastructure, including cutting-edge graviton-based compute clusters. His approach to resource scheduling optimization and memory spillover reduction demonstrated a deep understanding of both regulatory requirements and cloud architecture best practices. Perhaps most impressively, he designed dynamic query pipelines capable of handling both ad hoc investigative queries and scheduled regulatory workloads. This dual capability architecture ensured that urgent market surveillance activities never interfered with routine

compliance operations, maintaining the delicate balance required for effective regulatory oversight. Establishing governance excellence, beyond technical implementation, Saravan and Therumazisi Prabagarin established comprehensive metadata governance structures capable of handling trillions of records while ensuring strict compliance with regulatory SLA requirements. This governance framework became the foundation upon which the entire system's reliability and auditability rested, demonstrating his understanding that regulatory technology must be both powerful and trustworthy. Extraordinary results and industry impact. The results of this architectural transformation exceeded all expectations and established new benchmarks for regulatory

technology performance. The project delivered an impressive $2.1 million in annual cost savings through the elimination of expensive licensing fees and infrastructure optimization. More significantly, the system achieved a remarkable 300% improvement in query performance across key regulatory workloads, fundamentally changing how market surveillance investigations could be conducted. The enhanced platform enabled real-time metadata queries with seamless onboarding capabilities for new analytical tools, providing regulatory bodies with unprecedented flexibility in their investigation methodologies. Most critically, the system successfully supported the 15 to 20% annual growth in market data without any comprehensive.

to audit performance, ensuring that America's financial markets remained under robust surveillance even as trading volumes continued to expand. Empowering regulatory excellence, the broader impact of Saravan and Therumazisai Prabagarin's leadership extended far beyond technical metrics. The transformed infrastructure empowered both the SEC and NASDAQ to perform deeper and faster surveillance operations using structured, scalable, and auditable metadata systems. This enhancement in regulatory capability represented a significant advancement in market oversight technology, providing investigators with tools previously unavailable for detecting sophisticated trading irregularities. Recognition and career-defining achievement. The success of this

complex transformation earned recognition at the highest levels of both FINRA and regulatory partner organizations. The project's achievement in delivering substantial cost savings while dramatically improving performance established Saravan and Therumazisai Prabagarin as a leading authority in regulatory technology architecture. For Saravan and Therumazisai Prabagarin personally, this project represented more than successful system migration. It became a defining demonstration of his ability to lead large-scale architectural transformations under the most demanding circumstances. The experience deepened his expertise in cloud native architecture, open-source technology integration, and regulatory compliance aid in precedented scale.

Setting new standards for regulatory technology, the F-I-N-R-A-CAT transformation illustrates the power of visionary leadership when applied to mission-critical regulatory infrastructure. Saravan and Therumazizai Prabagarin's methodical approach to architectural modernization proved they've been the most complex legacy systems could be transformed without compromising operational integrity. His success demonstrated that strategic thinking, combined with technical excellence, could deliver both immediate cost benefits and long-term capability enhancements. This project stands as a beacon of innovation in regulatory technology, showing how thoughtful leadership can navigate the complex requirements of financial oversight while embracing

modern architectural principles. As financial markets continue to evolve in complexity and speed, this transformation provides a blueprint for how regulatory technology can adapt and thrive. ensuring that market surveillance capabilities keep pace with the ever-changing landscape off financial trading. The F-I-N-R-A-CAT project validates Saravan and Theramasi Prabagarin's philosophy that persistence, strategic vision, and architectural excellence can overcome even the most formidable technology challenges, establishing new standards for regulatory infrastructure modernization that will influence the industry for years to come. About Saravan and Therumazizai Prabagarin, as a visionary leader in regulatory technology and cloud architecture, Saravan and Thirumasi Prabagarin combines deep technical

expertise with exceptional strategic thinking capabilities. Throughout his progression to principal architect, he has demonstrated remarkable ability to modernize complex legacy systems while maintaining the strict reliability and compliance requirements essential to financial market oversight. His collaborative leadership approach evidenced by successful management of cross-functional teams including cloud engineers, database specialists, and regulatory compliance experts, has consistently resulted in transformational project outcomes and enhanced organizational capabilities. Saravanin's commitment to technological excellences demonstrated through his success in architecting enterprise scale systems that serve critical regulatory functions while delivering substantial

cost optimizations and performance improvements. This story was distributed as a release by Sonja Kapoor under Hackernoom's business blogging program. Thank you for listening to this Hackernoon story, read by artificial intelligence. Visit hackernoon.com to read, write, learn and publish.