Pub Sub Interview Questions
4 interview questions in our bank cover Pub Sub, most of them System Design for ML. They average 4.0/5 difficulty — hard — and each one was reported by a candidate after a real interview. Companies known to ask about Pub Sub: Anthropic, Sierra, Roblox, Meta.
Practice these on the problems board →Companies that ask about Pub Sub
Question mix
- System Design for ML4
Difficulty
- 4/5 — hard4
Questions tagged Pub Sub
Design a 1:1 Chat System (Pub/Sub, Partitioning, Multi-Region)
4/5A real-time messaging design round that drills into how a sent message reaches every live device of its recipient, which key the message log is sharded on, and how two people in different continents still see one consistent order. Expect capacity math, an idempotent send path and a plan for growing history storage over years.
System Design for MLAnthropicDesign an LLM-Backed Customer-Service Chat System with Failure Handling
4/5A support-bot architecture round where an AI agent relies on a third-party model API that can stall, throttle or cut off mid-answer. Expect to walk a single turn from widget to model and back, then defend backoff with jitter, idempotent tool actions, resumable streaming and a fallback path when things break.
System Design for MLSierraDesign a ROS-like Pub/Sub System
4/5Engage with a distributed systems architecture challenge frequently discussed in infrastructure interviews at Roblox, focusing on publish-subscribe communication frameworks. Candidates must architect a message-passing pipeline that addresses service discovery, network transport layers, and delivery guarantees like at-least-once or exactly-once semantics. The discussion also requires handling backpressure mechanisms and system scalability under heavy messaging loads. Access to the complete architectural breakdown and expert reference designs requires a paid subscription.
System Design for MLRobloxDesign an Online Auction System with Concurrent Bidding
4/5Design a high-throughput, real-time bidding architecture in this classic Meta system design interview question modeled after major online auction platforms. You will address complex distributed systems challenges including concurrent bid ingestion, low-latency price broadcast mechanisms, anti-snipe deadline extensions, and definitive auction close-out semantics. The discussion highlights your capability to defend concurrency control strategies, estimate capacity requirements, and maintain consistency under heavy load. Read the complete architectural deep-dive and expert design solution by subscribing to the platform.
System Design for MLMeta
Studied alongside
Pub Sub interview FAQ
- How many Pub Sub interview questions are there?
- 4 reported questions, mostly System Design for ML.
- Which companies ask Pub Sub questions?
- Anthropic (1), Sierra (1), Roblox (1), Meta (1).
- How hard are Pub Sub questions?
- They average 4.0 out of 5: 4 at 4/5.