Experienced Mobile + Backend Developer Needed for Existing Production App

I’m looking for an experienced full-stack developer to improve AWriter, an existing writing application. For now, improving the existing Platform Review is the priority. I’d like a separate fixed-price quote and estimated timeline for each item below so I can decide what to prioritize. 1. Improve Current Platform Review — PRIORITY The current reviews aren’t always accurate, and some feedback can be confusing. I want the reviews to be: * Clearer and more consistent (chapter/outline analysis) * More accurate and useful/actionable * Able to remember relevant information from previously reviewed chapters For example, if a writer reviews Chapter 1 and then Chapter 2, the system should use relevant context from Chapter 1 when reviewing Chapter 2 rather than treating each chapter completely independently. Important: The review logic should NOT be the same for every platform. Each platform needs its own carefully defined review criteria and logic based on that platform’s requirements and expectations. The architecture should also allow platform-specific criteria to be updated easily if a platform changes its requirements. 2. Add More Writing Platforms Add additional platforms to the Platform Review with their own review criteria and logic. Please provide pricing based on the number of platforms. 3. Improve In-App Guide / Onboarding Make AWriter easier for new writers to understand, including: * What each feature does * How to use each feature * How to get the best results from Platform Review 4. Story Editor — Future Feature I’m considering a separate Story Editor for general writing feedback regardless of publishing platform. It could identify issues such as structure, pacing, clarity, character consistency, repetition, weak areas, and writing fundamentals while helping writers improve their own work rather than generating their story. Please quote this separately. Development is not approved yet. 5. Web/Laptop Version — Future Project AWriter currently works on phones and tablets. I’d eventually like a web version for laptop/desktop users. Please provide a separate fixed-price estimate and timeline. Development is not approved yet. 6. AI/API & Ongoing Costs If AI is required, please explain: * Which AI service/model you recommend * Whether it can work with our existing Firebase/backend setup * Estimated ongoing AI/API costs * How costs would scale with usage To Apply Please send: 1. A separate fixed-price quote and estimated timeline for each item 2. 2–5 relevant apps/products you have worked on, with links if available 3. Your role in those projects 4. Relevant experience with AI/LLMs, backend systems, and existing production apps 5. Your recommended technical approach for improving the Platform Review The Platform Review is the immediate priority. I want to understand the development cost and ongoing running costs before deciding what to approve.