Upgrade and Optimize "Kirana Bhaiya" App

​I am running a grocery delivery startup called "Kirana Bhaiya." The app is currently live and receiving orders, but we are facing technical challenges that are affecting the user experience. I am looking for an experienced mobile app developer to optimize the app, fix existing bugs, and improve overall performance.
​Key Responsibilities:
​Image Optimization: Fix slow image loading issues by implementing compression and efficient caching.
​Real-time Pricing: Ensure product rates/prices sync correctly from the admin panel to the user app without delays.
​Performance Tuning: Improve app speed and reduce lag to provide a smooth shopping experience.
​Bug Fixing: Identify and resolve app crashes and navigation errors.
​UI/UX Improvements: Make minor adjustments to the interface to make it more user-friendly for local customers.
​Required Skills:
​Proven experience in Flutter, React Native, or Native Android (whichever your app is built on).
​Strong knowledge of Backend APIs and Database Management (Firebase/Node.js).
​Experience with Image Compression and Lazy Loading techniques.
​Ability to deliver clean, bug-free code within deadlines.
​Budget & Timeline:
​Budget: Negotiable (Fixed price or Hourly based on experience).
​Timeline: Looking for an immediate start.
​How to Apply:
​Please share your portfolio or links to apps you have previously developed or optimized. Mention "Kirana Bhaiya" in your application so I know you have read the requirements.