Sample content. This is a placeholder interview write-up to demonstrate the article format — it is not a real interview experience.
Overview
This is a sample interview experience article included to demonstrate the recommended
format for this section. Replace it with a real write-up, or use it as a template for your
own — just remove sample: true from the frontmatter once the content reflects an actual
interview.
Process
- Rounds: one 45-minute system design round (as an example).
- Format: whiteboard/collaborative doc, interviewer-driven follow-ups.
The Question (paraphrased)
“Design a notification service that can deliver push, email, and SMS notifications to millions of users, with delivery guarantees and user preference controls.”
What Went Well
- Starting with clarifying questions (delivery guarantees? which channels? scale?) before drawing anything.
- Explicitly calling out the tradeoff between at-least-once delivery and idempotent consumers before the interviewer asked about it.
What Could Have Gone Better
- Spent too long on the data model before sketching the high-level architecture — worth timeboxing each section out loud so the interviewer can redirect early if needed.
Lessons for Next Time
- State assumptions and capacity numbers early, even rough ones — it signals structured thinking and gives the interviewer something to correct if it’s off.
- Leave explicit time at the end for the “how would this change at 10x scale” follow-up, which came up in this format.
Sample Follow-up Questions Asked
- How do you avoid duplicate notifications on retry?
- How would you support per-user rate limiting on notification volume?
- How would you prioritize urgent notifications over bulk/marketing ones?