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Interview questions by company and topic | SysRound

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56 questions

Showing 1–25

System designHard
Design a ticket booking system like Ticketmaster
Contention on scarce inventory: seat holds with TTL, locking/optimistic concurrency, payments, flash-sale traffic and virtual queues.
Companies: Agoda, Airwallex, Amazon, Apple +15
concurrency · idempotency · load-shedding · locking
Last reported Nov 2026
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Practical engineeringHard
Same-Hostname Web Crawler: Single-Threaded, Then Multithreaded
Companies: Anthropic
Concurrency · Graphs
Last reported Oct 2026
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System designHard
Design a digital wallet like Venmo
Stored balances and peer-to-peer transfers: concurrent debits, retries with the same request key, and recovery without lost money.

Page 1 of 3

Companies: Paypay, Revolut

concurrency · durability · idempotency · ledger

Last reported Oct 2026

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System designHard

Design a warehouse management system

Physical stock and digital records must agree while workers receive, move, pick, and pack goods at the same time.

Companies: Amazon, Coupang, Procore

concurrency · inventory · physical-reconciliation · request-retries

Last reported Oct 2026

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System designMedium

Design a distributed rate limiter

Algorithm trade-offs (fixed window, sliding log, sliding counter, token bucket), placement, distributed atomic counting, failure modes.

Companies: Amazon, Anthropic, Apple, Freshworks +14

api-gateway · atomicity · Concurrency · Consistency & Availability

Last reported Oct 2026

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Practical engineeringMedium

Build a Resize-and-Rotate Image Pipeline with Multiprocessing

Companies: Anthropic

Concurrency · File & Media Storage

Last reported Oct 2026

Practical engineeringMedium

Make a Web Crawler Concurrent with Thread-Safe Visited State

Companies: Anthropic

Concurrency · Graphs

Last reported Oct 2026

System designHard

Design a hotel booking system

Date-range inventory: atomic multi-night reservations, expiring holds, stale search results, and payment races.

Companies: Airwallex, Amazon, Booking.com, Carta +10

concurrency · idempotency · inventory-management · payments

Last reported Oct 2026

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Practical engineeringMedium

Implement a fault-tolerant work queue that never loses tasks when workers fail

Companies: OpenAI

Concurrency · Data Structure Design

Last reported Oct 2026

Practical engineeringHard

In-Memory Key-Value Store with Crash Recovery from a Log and Concurrent Access

Companies: OpenAI

Concurrency · Key-Value Stores

Last reported Sep 2026

Practical engineeringMedium

Batch Image Resize and Rotate with Pillow: Exact Dimensions, Parallelism, Bad Files

Companies: Anthropic

Concurrency · Fault Tolerance & Failover

Last reported Sep 2026

Practical engineeringMedium

Same-Host Web Crawler: Single-Threaded, Then Concurrent with a Thread-Safe Visited Set

Companies: Anthropic

Concurrency · Graphs

Last reported Sep 2026

Practical engineeringMedium

Compare Threads and Processes for Image Processing

Companies: Anthropic

Concurrency · Operating Systems

Last reported Sep 2026

System designMedium

Single-Machine Cache with WAL Persistence, Sharded Locks and LRU

Companies: Databricks

Concurrency · System Design

Last reported Sep 2026

System designMedium

Thread-Safe Durable Event Writer Shared by Thousands of Threads

Companies: Databricks

Concurrency · System Design

Last reported Sep 2026

Practical engineeringMedium

Make a Hostname-Limited Crawler Concurrent

Companies: Anthropic

Concurrency · Graphs

Last reported Sep 2026

System designHard

Design an airline reservation system

Reservations across several flights require temporary holds, strict seat ownership, fresh search results, and safe payment recovery.

Companies: Axon, Bol.Com, Circle, Expedia +2

concurrency · flight-search · idempotency · inventory

Last reported Sep 2026

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System designMedium

Process One Million Quote Updates per Second

Companies: Jane Street

Concurrency · System Design

Last reported Aug 2026

Practical engineeringHard

Design a Dependency-Aware Concurrent Tool Scheduler

Companies: OpenAI

Concurrency · Job Scheduling & Workflows

Last reported Aug 2026

System designHard

Design Google Docs

Concurrent text editing: convergent edits, durable reconnect and replay, live cursor positions, and per-document fanout.

Companies: Amazon, Asana, Bloomberg, Expedia +6

concurrency · crdt · operational-transformation · presence

Last reported Aug 2026

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System designHard

Design an inventory management system

Shared stock across warehouses and sales channels: concurrent reservations, reservation expiry, and correct stock counts.

Companies: Amazon, Blue Origin

all-or-nothing-carts · concurrency · hot-keys · inventory-allocation

Last reported Jul 2026

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Practical engineeringHard

Debug a Python Job Scheduler: Failed Jobs Stuck in PENDING and Async Jobs Never Run

Companies: OpenAI

Concurrency · Debugging

Last reported Jul 2026

Practical engineeringHard

Batch-Apply Pillow Image Transforms, Then Parallelize: Processes vs Threads

Companies: Anthropic

Concurrency · Programming Languages

Last reported Jul 2026

System designHard

Design a Concurrent Image Processing Service

Companies: Anthropic

Concurrency · Distributed Coordination · System Design

Last reported Jul 2026

System designMedium

Object-Oriented Design: Hotel Room Booking System

Companies: Apple

Concurrency · System Design

Last reported Jun 2026