Event-Driven Payments at Consumer-Finance Scale

The P2P platform is the consumer side of the global payments company's two-platform fintech architecture, covering peer-to-peer payments, the social feed, merchant checkout through pay via the platform, cards and balance, and crypto. Taller's engagement at the P2P platform and the global payments company organization is the deepest fintech engineering footprint in the portfolio: multi-year, multi-pod, spanning the consumer side at the P2P platform, the platform side at this company, and the processor side at their payment processing platform (still active in 2026). The five cases below describe what Taller has delivered against the strategic surfaces the P2P platform's report proposed.

Synchronous payment processing at the P2P platform's scale becomes economically prohibitive — capture batches start to impact OLTP performance, infrastructure remediation costs balloon, and transaction-replay capacity disappears. The platform required event-driven re-platforming (Kafka, Kinesis, DynamoDB write-ahead logs, MongoDB to DynamoDB migration with backfill / dual writes / ramped reads / write cutover), a gRPC API edge replacing REST under peak load, and onboarding consolidation across 30+ flows.

Taller delivered three sized platform primitives within the broader event-driven re-platforming. The Apache Fineract system of record — a customized SOR hosted in Docker with ActiveMQ, Java, PostgreSQL, and TestNG — replaced external SOR providers, eliminating licensing dependencies and freeing the global payments company to manage configurations independently. The gRPC implementation used HTTP/2 and bidirectional streaming on Java, Spring Boot, Protocol Buffers, and Docker, handling thousands of concurrent requests, reducing latency, and cutting infrastructure cost. The Unified Native Onboarding platform consolidated thirty-plus customer-onboarding flows into one adaptable, localizable experience on Spring Boot 17 with Maven, Mockito, Hibernate, PowerMock, JUnit, Juno, Tomcat, TestNG, and JAXB2.

The Apache Fineract SOR reduced operational costs, accelerated configuration changes, and enabled global product expansion — and paved the way for the U.S. their BNPL product launch. The gRPC implementation improved user experience, reduced infrastructure costs, and enhanced scalability. The Unified Native Onboarding platform consolidated thirty-plus flows into one adaptable platform with context-driven UX and global onboarding localization.

The P2P platform and the global payments company's scale outcomes — hundreds of billions in TPV, billions per month in P2P flows, Q1 2025 P2P-platform payment TPV +50% growth, MAUs +30%, debit cardholders +40% — are the global payments company and its P2P platform outcomes earned by the cumulative architectural investment across multiple engineering functions. The architectural strategy is the global payments company's. The three platform primitives (SOR, gRPC, Onboarding) are Taller-delivered foundations underneath that strategy.