Applied directly online via LinkedIn job portal. No referral.

Reached out to by recruiter via email to chat.

Then, phone interview (60 minutes):

• Behavioral questions (15 minutes)
• iOS code debugging (Hackerrank)
• Company-tagged LeetCode question (medium)

Then, onsite interview (4 hours, 4 interviews, 60 minutes each):

1. Declare, define, and implement a Network Client API and use concurrency to deliver results (dispatch groups, semaphores, barriers, queues, session, etc.) in the expected manner.

2. Non-company-tagged LeetCode medium for one problem mixed with OOD (create classes); variation of BFS.

3. System design for Snap-specific functionality. Mock interviews with other candidates interviewing for iOS roles really helped here.

4. Hit API, get data, build a simple app with a collection view, and show data and images for each cell.

Overall, not too hard and was pretty practical. I made some dumb mistakes that wasted time, but I think the interviewers saw that they were dumb mistakes and gave me grace. Either I fixed them soon after, or they gave me small hints along the way.

Know iOS concurrency well.