Architecture Case Study: fintech

High-Frequency FinTech

"Your trading platform loses money every millisecond it lags. 300ms delays during market spikes mean missed trades, angry clients, and revenue walking out the door. Traditional architectures simply can't keep up with the speed of modern finance."

CONSTRAINT: 100k TPS / <5ms Latency

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Technical Implementation

A zero-latency architecture built in Rust with Hexagonal design. The Domain Layer contains pure business logic with no external dependencies—completely testable and portable. The Application Layer defines ports (traits) that the infrastructure implements. ScyllaDB provides sub-millisecond writes, Kafka ensures ordered event delivery with exactly-once semantics.

ADR: DECISION: Rust over Go/Java. RATIONALE: Go's garbage collector introduces unpredictable 10-50ms pauses. Java's GC is even worse under memory pressure. Rust's ownership model guarantees zero GC pauses and predictable memory allocation, critical for maintaining p99 latency under 5ms.