Implement push notifications & more on a React.js application using Ionic and Capacitor - 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:

Help with implementing Ionic & Capacitor features on React.js application using Firebase

### Background

We have developed a React.js application with Firebase as the backend, the application MVP has been completed and has gone through one round of beta testing. We need help from an Ionic developer with experience in React.js and Capacitor (preferably but not required)

### Job Description

- Push Notifications, Local Notifications and Custom Alerts for Android & IOS
- Adding Splash Screen and Icon
- Firebase mobile authentication for Android & IOS
- [https://www.npmjs.com/package/capacitor-firebase-auth](https://www.npmjs.com/package/capacitor-firebase-auth)

### Potential Extra Work (will pay extra)

- Referral Reward functionality using Dynamic links
- Swipe to Refresh the App
- App Optimisation, Image Lazy loading

We are willing to pay higher fees for experts in the domain required.

Estimating assumptions and context:
The scenario is based on a Freelancer listing from 2021-09-11 (historical project ID 31465577). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us.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.