Notes on distributed systems, API design, and the engineering decisions behind production systems.
Sending a campaign is rarely a single operation. This article explores how campaign creation, recipient processing, and message delivery were separated into reliable background workflows capable of handling thousands of independent deliveries.
Withdrawing money is significantly more complex than receiving it. This article explores how the platform designed a reliable withdrawal pipeline using Stripe Connect while preventing duplicate payouts, race conditions, and inconsistent balances.
Capturing a payment does not always mean it should be immediately settled. This article explores how escrow became the foundation for handling reservations, disputes, delayed settlement, and manager payouts.
Failures are inevitable when processing large background workloads. This article explores how retry strategies, failure isolation, and retry limits were designed to maximize successful deliveries without overwhelming external providers or duplicating work.
Direct payment processing worked well for the platform's initial requirements, but growing financial workflows eventually required a dedicated financial layer. This article explores why an internal wallet became the foundation for every monetary operation.
A campaign's success cannot be determined by a single status. This article explores why delivery was modeled at the recipient level, enabling accurate progress tracking, partial success, retries, and operational visibility.