Big Bang Rewrite
Big Bang Rewrite is a software development approach where an entire legacy system is replaced with a new implementation in a single, high-risk deployment, rather than incrementally. It involves halting development on the old system, building the new one from scratch, and switching over all at once, often with significant downtime and resource investment. This method contrasts with incremental refactoring or strangler pattern approaches that gradually replace components.
Developers might consider a Big Bang Rewrite when a legacy system is so outdated, poorly documented, or tightly coupled that incremental changes are impractical or too costly, such as with obsolete technology stacks or monolithic architectures that hinder innovation. It can be justified for critical business systems requiring a complete overhaul to meet modern requirements, like scalability or security, but carries high risks of failure, budget overruns, and disruption to operations.