Experience is key for me, also can able to debug and rework on existing code easily.
But for that I need more details of this project, anyways I will not do the rocket science here but definitely it will be best than existing one.
Yeah, I am not able to bid as I am fresher on freelancing work, so it will be best opportunity to prove myself and complete satisfactions of you and earn reasonable money and reputation.
Definitely, bootstrap and RoR is best combination and we can take best out of it.
I can redesign application with respect to scalability, maintainable, security, & performance.
So, If I get chance to work on it to make your money worth so let me know.
You can get connected with me on following contact points
You can get contacted with me to discuss it further.