build simple app with push notifications - 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:

I need app with one page only , once user installs , will need to have token unless cannot continue only
first time and also will ask them which channel(s) they want to subscribe to and they can subscribe to any number of channels
the list of channels will be pulled from an api (already exists no development except calling the api and getting list of channels)

the app need to receive push notifications from OneSignal for example or (you can recommend any other service but this service need to have api that we will call from server side (server side is out of the scope of this))
however you will be responsible to test this from Postman for example

once the notification come , and user click it it needs to open all details of the notifications and maybe images and links in the app (also need to show the channel that received this notification if subscribed to more than one channel)

===========================================================
your responsibility
- Design and develop the App (Android and iOS)
- App should not run first time only except the user has predefined token you can use now "ALLOWME" for all users
- test that it is receiving push notifications and showing them appropriately
- calling the channels api to get list of available channelSubs assume the results of this api will be
[
{ channelId:1, channelMain:'Wahtsoever Organization', channelSub:'Group 1'},
.....
]
- the user can subscribe to any line of this channels
- fully pushing the app to google play and apple app store is your responsibility
you can create new common email that we can use for both

Estimating assumptions and context:
The scenario is based on a Freelancer listing from 2022-10-14 (historical project ID 34930071). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us.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 30–250 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.