Payments engineering stands at the crossroads of complex state management, security, precision, and fault tolerance. Building efficient systems that handle the delicate nature of transferring value between parties requires a keen understanding of potential pitfalls, from simple ones like double charges to intricate ones like reconciliation.. Throughout this talk, you'll gain insights into the complexities and nuances of this specialized domain. But beyond just understanding payments, the crux of this talk lies in drawing parallels to general software development. You'll learn how the principles used in payments - like idempotency, immutable architecture, and rigorous testing - can be universally applied to create robust, efficient, and trustworthy software. Join us for an enlightening session that merges the best of two worlds: payments and software engineering.