Bugsnag is a real-time error tracking and application stability platform. It captures exceptions, crashes, and runtime errors from web, mobile, and backend applications, groups them intelligently, and alerts teams when issues emerge. It provides full stack traces, session replays, and user impact data to accelerate debugging. Error monitoring is non-negotiable in production environments. Teams using Bugsnag fix bugs faster and ship more stable code. It's a standard tool in modern DevOps workflows, and familiarity helps in any engineering role.