Hi, I checked out the links you provided and I have a pretty clear idea about what you want to build. I can build a platform for you, with these features:
1. Membership (dedicated, dashboard page, payments, display of job info for non-registered users)
2. Scraping (depending on the algorithm you already have)
3. Page with the job search feature (filters, live search)
4. User dashboard
5. LinkedIn integration
6. etc.
As for the scraping of company contact details (like email), I'd look for that on publically available APIs, and Google, based on some company identification details found in the job descriptions, domain, etc. And regarding LinkedIn, there are already libraries to authenticate users with that, and an API to help fetching the information needed.
I'm a web developer with years of experience and I work on websites, custom solutions, and full stack web applications with PHP and Javascript for databases, scraping, and the frontend.
Feel free to contact me.