Working With Existing Codebases Questions

Skills and practices for quickly understanding, navigating, and safely modifying an existing mobile codebase. Topics include reading architecture and module boundaries, using version history and code search to find ownership and intent, following and enforcing conventions, writing and running unit and integration tests, adding instrumentation, making incremental refactors, managing dependencies and build configuration, using feature flags and CI, and communicating changes through code reviews and documentation. Interviewers assess a candidate's ability to make low risk changes, reduce technical debt, and deliver features while preserving stability and clarity in a legacy or large codebase.