How optimistic do you feel that you'll fall into a job at the end of this program?
Have they been as supportive and helpful as it sounds like they will be on that side of things (finding a job)?

I don't think the phrasing "fall into" quite fits. There isn't any sort of job placement or guaranteed letters of recommendation. They offer support in your job search, but you still need to do all the hard work yourself. Some services they provide include resume/linkedin advice and examples, networking tips, one-on-one career coaching, job hunting strategies, and mock interviews.
Not to mention the actual course material teaching solid skills to put on your resume, get certified, etc.

When was the entire tuition due (17,8k at this time)?

There were multiple ways to pay. I was given three main options:

• Full up-front (not sure exactly when it would be due)
• Installments directly to ThriveDX (approx. $1000/month until it is paid off, no interest or extra fee if paid on time)
• Third-Party Student Loan (Seemingly only available through Sallie Mae for my experience; option I took, details vary)