Competitive analysis
How do people look for carpools?
There is no direct competitors in current market.I started by looking at two current major apps where people find ski carpools.To quickly verify whether this is a problem worth solving, I decided to lead the team to :

Key findings
Finding the carpool information is time-consuming. It takes a lot of time to manually filter out a lot of other messages to find some relevant carpool information.
It takes effort to find out if the carpool is still available: Even if you do find information about a carpool, you have to chat with the sender to find out if it's full or still available.
Having no information about other co-riders feels unsafe. Only can get to know the OP (original poster) info by looking at his/her profile, but know nothing about other co-riders - how many people will go together? what's their gender? etc.
Opportunities
Providing a specialized platform tailored for ski lovers for a better carpool experience. Make it easier for users to find carpools and make the information more open and transparent about co-passengers.
User survey
Understand users consideration
I surveyed 124 ski lovers between age 17-60+. The hypothesis of filling the market gap motivated me to:
What made me excited was that almost all people are interested in a specialized skiing carpool app. Only 5 people (among 124) confirm they will not carpool.

All the findings below are essential guidance for me me to prioritize information in later design:

User interview
Uncover user’s pain points
By knowing the result that the majority are interested in carpool, I conducted interviews to dive deeper into the situation of people's pain points and their ideal carpooling. I talked with 6 people who had carpool experience before, half of them had the experience of looking for a carpool, and the rest had the experience of giving a ride.

I quickly coded the responses from the interviews and found that what people most concerned about is the uncertainty of who will be carpooling with.