1. Blockchain technology not necessarily needed for this project.
bitJob isn't really dependent on blockchain nor does it benefit the project in a spectacular way. The company even admits it in their whitepaper.
Tapping into the the job seekers market will be difficult, with many popular websites already providing such services, user adoption is sure to be at snails pace. Utilizing blockchain technology is nothing more than a marketing scheme to gain traction and crowdfunding investment, though bitJob remains transparent in this fact which is noted in their whitepaper.
Implementing a "credit scoring" mechanism through smart contracts to valuate an individual could prove to be a reliable metric if properly developed. Assuming that the hiring and payment process will be seamless and automated is being facetious, dispute resolution can be a tough battle that will increase business operating costs.
The team appears to be poised for success, if a usable product can gain traction in their intended student demographic then the only thing standing in the way is the obscene amount of competition from websites such as Indeed, Monster, LinkedIn, and Glassdoor.