Zero-Downtime Incremental Refactoring, API Gateway Routing & Distributed Event Streams
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Never attempt a 'big bang' rewrite of a production monolithic codebase. Instead, map out the domain bounded contexts (e.g. Auth, Billing, Notification, Inventory) and extract the highest-ROI, lowest-coupling subdomains first.
Deploy an API Gateway (such as Nginx, AWS API Gateway, or Kong) in front of the legacy monolith. As new microservices are built in modern stacks (e.g. Next.js + FastAPI), route specific endpoints to the new services while proxying un-migrated paths to the monolith.
During database separation, implement dual-writing or Change Data Capture (CDC) via Kafka or AWS Debezium to ensure that legacy and modern databases maintain complete data consistency until cutover is finalized.
End-to-end full-stack software architecture, code reviews, and fixed-scope delivery sprints.
