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Architecting a highly secure, high-frequency transaction engine for a disruptive African FinTech startup.
PaySync sought to dominate the remittance and micro-lending market in sub-Saharan Africa. The challenge was building a mobile-first neo-bank that could operate on low-end Android devices while processing highly secure, cross-border transactions faster than legacy banking infrastructure.
Building a fault-tolerant financial ledger that guarantees zero double-spending, even in the event of severe network partitions. Furthermore, the system required complex integrations with multiple national identity databases for automated KYC (Know Your Customer).
Why HintCore
React Native, SQLite (Offline-first)
Rust, PostgreSQL, Apache Kafka
Google Cloud Platform, Terraform, HashiCorp Vault
Secrets management was strictly handled by HashiCorp Vault. We implemented mutual TLS (mTLS) for all internal microservice communication. On the mobile side, we used JSI (JavaScript Interface) in React Native to bypass the standard bridge, allowing the app to encrypt biometric data at native speeds. The app was heavily optimized to stay under a 20MB download size.
Third-party banking APIs are highly unreliable. We had to implement aggressive circuit-breaker patterns and exponential backoff retry logic to prevent cascading failures when national bank gateways went offline.