I recently completed the Pinterest Online Assessment, and honestly the overall style felt very different from traditional LeetCode-style OAs.
Pinterest is clearly moving toward more business-scenario simulation problems instead of pure algorithm memorization. The questions were not extremely difficult algorithmically, but the prompts were long and packed with edge cases. If you are not used to this type of OA, it is very easy to waste a huge amount of time just understanding the rules.
The OA was hosted on HackerRank and included two large coding problems focused heavily on simulation, state transitions, and real-world business logic implementation.
Question 1 — Electric Scooter Distance Simulation
The first problem simulated a shared electric scooter system.
You start from position 0 and need to reach a destination called finish. Along the way, scooters are placed at different positions, and each scooter contains a battery value equal to its riding distance.
The rules were:
- Walk to the nearest scooter on your right
- Ride the scooter until its battery is fully consumed
- Continue repeating the process until reaching the destination
- Return the total riding distance traveled on scooters
This question was much more about correctly simulating movement states than applying a standard algorithm template.
The biggest difficulty came from handling edge cases correctly:
- No available scooters
- Scooters beyond the finish point
- Repeated positions
- Final movement before reaching the destination
Question 2 — Bubble Collapse Game
The second problem was a 2D grid simulation question.
You are given a board where each cell contains either:
- A positive integer representing a bubble color
- 0 representing an empty space
If a bubble belongs to a connected region large enough to explode, the entire region is removed simultaneously. After the explosion, gravity is applied and bubbles fall downward to fill empty spaces.
Only one explosion round is performed.
The implementation required:
- BFS / DFS connected-component traversal
- Batch deletion
- Gravity simulation
- Careful duplicate-visit handling
The tricky part was not the algorithm itself, but correctly managing all the board state transitions without introducing bugs.
My Biggest Takeaway
Pinterest OA now feels much closer to real engineering work than traditional coding interviews.
The focus is no longer:
- “Do you remember this algorithm template?”
Instead, it has become:
- Can you understand complicated business rules quickly?
- Can you translate product behavior into stable code?
- Can you handle edge cases cleanly?
- Can you write maintainable simulation logic?
This trend is becoming very common across content-platform companies like Pinterest, TikTok, Airbnb, and Instacart.
Preparation Advice
If you are preparing for Pinterest OA, I strongly recommend practicing:
- Simulation problems
- Grid / matrix questions
- Business logic implementation
- State-machine style coding
Pure LeetCode pattern memorization is becoming less effective for these companies.
Additional Resources
During preparation, I also used materials from Interview Aid. They provide recent OA question collections, coding interview coaching, mock interviews, resume optimization, and OA assistance focused on North American CS recruiting.
A lot of their recent content was surprisingly aligned with the newer “business simulation” style that companies are now using.
Hopefully this breakdown helps anyone preparing for Pinterest or other content-platform engineering interviews. Good luck and hope everyone lands their offer soon.
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