Scaling Jira Cloud migrations with external importers

This post details the architectural evolution and engineering enhancements of a new external migration platform for Jira Cloud. It highlights the transition from a legacy, monolithic importer with scalability and reliability issues (6,000 issues/hour, 70-80% success rate) to a new microservices-based platform. The new platform achieves 20x faster migrations and 30x better throughput, with a 95% reliability rate. Phase 1 focused on building scalable CSV importers using a microservices architecture with components like a Migration Service, Migration Process Orchestrator (leveraging AWS Step Functions and SQS), Migration Transformer Engine, User Migration Service, and Project Import Service. Key benefits include optimized scalability, performance, reliability through asynchronous processing and intelligent retries, and reduced technical debt.