Next.JS Developer needed for SaaS

Description

Hi, I am in need of a Next.JS developer to complete the following:
- Link an existing API to my SaaS front-end - Develop an algorithm that detects keywords set by a user in the data pulled in by the API and displays the content in the SaaS front-end- Develop a notification system by Twilio and SendGrid to notify the user when a keyword is detected- Clear up any UX/UI issues
This is an unfinished project by another developer. Please detail how you would look to complete this task, in what milestones and in what timescale.
Please note, payment is strictly on completion.