I have a live SwiftUI-based social app that already ships chat, video feeds, stories, live scenes, an in-app currency (stars) and subscription flow. The code follows MVVM, talks to a set of REST back-ends and is in the store today. What I need now is an experienced iOS engineer who can drop into the existing project, diagnose issues quickly and raise the overall quality bar. The immediate focus is three-fold: • First, do a thorough walkthrough of the current codebase so you understand our MVVM layers, networking helpers and IAP logic. • Next, remove bugs that are spiking our crash reports and tighten up general stability. • Finally, tune performance in the chat and media areas, then layer in a handful of small feature requests we already have queued for those modules. You will be writing Swift 5+ and SwiftUI, refactoring view models, profiling with Instruments, measuring FPS and memory, optimising REST calls, and touching StoreKit for in-app purchases. Solid knowledge of concurrency in modern Swift (GCD, async/await) will come in handy as our feed and chat flows are highly parallel. Deliverables are straightforward: 1. A cleaned-up branch that builds without regressions and passes the current test suite. 2. A short report outlining the key stability fixes, the performance gains you achieved (preferably with metrics from Instruments), and the steps needed for any future refactor you would recommend. If you have a track record of jumping into existing iOS apps and making them faster, safer and easier to extend, I’d love to work with you.