Repay

dashboard
add debt entry screen

Inspiration

We have and are suboptimal friends who take forever to pay back debts and sometimes forget entirely.

What it does

Repay allows individuals to create debt entries which state that another user owes them a certain amount of money, as well as a description and ; once an entry is confirmed by both involved parties, it appears in the dashboard of each. Once a debtor pays back their debt, the lender can mark a debt entry as paid. Users are assigned a numerical score based on an algorithm which takes into account how early or late they tend to pay off debts and the monetary value, normalized with a sigmoid function; other users can take this score into consideration before lending money.

How we built it

We built a web server API with Node.js and hosted it on RedHat OpenShift. All computation and data processing is done on the backend, including the user score computation. Users' scores are computed using an algorithm which increases or decreases the score from 0 proportionally to how early or late the user pays back debts on average, relative to the time given to pay back each debt. This raw score is run through a sigmoid function to return a score between 0 and 1, with 0.5 implying debts are generally paid back exactly when they are due. This scoring function provides valuable information to users who are unsure about lending money to others.

We built an iOS app using Xcode and Swift 3. Pain, struggles, tears, insanity, and success.

im hungry

Challenges we ran into

deleting code that was thought to be committed to Git but actually not committed to Git
learning iOS and Swift 3
formulating scoring algorithm
collaborating with on iOS development

Accomplishments that we're proud of

not losing confidence despite constant failure

What we learned

iOS development
the fact that Xcode and Git are not soulmates

What's next for Repay

Automated debt payment through Stripe API
Android app, web portal
Improved, data-driven scoring algorithm

Built With

Submitted to

Los Altos Hacks II

Created by

I built the backend API for database operations and data processing. I also designed and implemented an algorithm to holistically score a user's reliability to pay back debt within a deadline. Additionally, I helped recovering old code from git and drew pretty shapes and equations on the whiteboard.

Avik Jain
I worked closely with Avik's API and created the data models and views (and view controllers!) for our iOS app. I also collaborated with David and Avik to plan the application flow and visual layout. But perhaps my most important contribution was drawing an inspiring picture a Winnie the Pooh and Mouse hybrid on the whiteboard walls.

Carolyn Duan
David Sun

Updates

Avik Jain started this project — Feb 05, 2017 08:50 AM EST

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