The topic: Modern distributed systems.

We will explore the expand-and-contract strategy, teaching you how to extend API contracts and database schemas in a backward-compatible way while managing over 150+ services and external partners with unknown upgrade timelines,. We dive deep into the technical nuances of dual-writes with feature flags, backfilling historical data in batches, and using shadow reads to prove system equivalence through measured metrics rather than belief

For those managing financial data, we tackle the complexities of the "credit player wallet" flow, explaining how to achieve exactly-once consistency and auditable balances without the overhead of expensive distributed transactions,. You will learn why exactly-once semantics are a product of atomic state transitions and idempotency, not complex messaging topologies like SNS fan-outs,.

We also elevate the conversation to the principal level, reframing technical migrations as distributed contract migrations across uncontrolled ecosystems. Discover how to handle organizational pressures—such as immediate legal requirements or partners who refuse to migrate—by treating backward compatibility as a product feature rather than technical debt,.

Join us to learn why the most successful systems are designed with the philosophy that rollback is the default operating mode, ensuring zero downtime and zero data loss in even the most complex environments,.