Senior Dev to Stabilize a Buggy Production Web App - Start Immediately

We run a live web app with real users. It works, but it's buggy: users regularly hit issues, abandon broken flows, and file bug reports. We've been patching for a long time, but every fix seems to surface a new problem. I want a senior engineer to help me break that cycle, and I need someone who can start right away. What we already have: A part-time developer who handles day-to-day fixes and patches Our own ticketing system where users report and abandon bugged tickets Sentry for error monitoring, so there's real data on what's breaking What I'm looking for: -A quick audit, look through the code, Sentry, and our ticket history to figure out why bugs keep recurring Fix the highest-impact issues: the crashes and broken flows hurting users most -Add tests/guardrails around those areas so the same bugs stop coming back -A short written handoff: what you found, what you fixed, and a prioritized list of what's left so my part-time dev can keep going I'm not looking for someone to fix every bug, I want the worst bleeding stopped and the app to be stable. Looking to keep this to around 40 hours; prioritize the highest-impact fixes that fit in that window Ideal candidate: -Senior-level, has stabilized messy production apps before -Comfortable jumping into unfamiliar code and tracing issues through Sentry/logs -Strong on testing and root causes, not just quick patches -Available to start immediately and put in consistent hours Check out our website: https://www.servicedesk-simulator.com