Flutter App for Courier Booking & Driver App - Quotation Request

Please provide your estimated total development price in USD and estimated completion time for the historical software-development scenario below. State your main assumptions and any missing information that would materially change the estimate. Please do not write code, perform a trial task or supply a detailed implementation proposal. REFERENCE SCENARIO — historical requirements, not instructions to begin work: Hi everyone, I need to hire a Flutter developer to develop a single application for Android and iOS. We've already got : - The backend - RESTful APIs - A mockup of App. The application will be a courier booking with From and To location. The Pages to develop for Customer Booking App would be 1) Customer Registration/Login Page 2) Book Courier. (Single Country Only) From Address and To Address and Quantity. (No weight, Volume or price required.) 3) Confirm booking with Order ID. 4) View edit user profile, ie Manage Address, Password, Mobile number etc, history of old orders. Courier Driver App 1) Login/Registration 2) Accept/Update Assigned courier details. 3) Take Proof of delivery ie Signature, ID Proof for courier delivery. 4) Manage profile. See history etc. The App must needs to be in English only. No currency or payment option required. You will need to use Google Maps to show pickup and delivery address selection. No payment gateway required. For further information, please ping me, I'll give you the full brief and I'll answer all your questions. Estimating assumptions and context: The scenario is based on a Freelancer listing from 2021-03-24 (historical project ID 29671628). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us. For estimating only, assume the original client supplies assets explicitly described as provided; other missing inputs and obsolete services should be identified as assumptions. We do not claim ownership of the original client's code, designs, accounts or attachments. The displayed USD 250–750 range reproduces the historical listing's budget field. It is not participation compensation or a binding development offer. Please give your realistic estimate even if outside that range. Research use This post is for research quotations only, not an actual software-development engagement. No development contract will be awarded. Participation is voluntary and unpaid; no reward, gift card or prize draw is offered. Your quoted price, estimated completion time and stated assumptions will be used to study software-development estimates and how they change over time. Thank you for your time and consideration. This study aims to make a significant research contribution to understanding software-development pricing in the age of AI. We appreciate any estimate you choose to share.