DDD
I model platforms around business capabilities, bounded contexts and language that stakeholders understand.
Architecture
The goal is not complexity. The goal is a system that can support real money, real people, real compliance and real growth.
I model platforms around business capabilities, bounded contexts and language that stakeholders understand.
I split systems only where autonomy, scale, compliance or delivery velocity justify the operational cost.
I use events for payment callbacks, operational workflows, audit trails, asynchronous processing and cross-domain coordination.
I separate operational commands from executive reporting where products need clean write models and fast read views.
I use Cassandra for high-volume operational data where write throughput, partition design and predictable access patterns matter.
I package services for repeatable delivery, production operations and cloud portability.
I design payment flows around idempotency, callbacks, reconciliation, provider adapters, auditability and support operations.