Interview questions

Metric Monitoring System

Design and implement an end-to-end metric monitoring system that includes authentication, rate limiting, and deployment considerations.

Companies: Microsoft

Last reported Apr 2026

Build a Reliable Streaming Chat UI

Companies: OpenAI

React & UI Frameworks · Real-Time Systems

Last reported Apr 2026

Minimum Cost Router Placement Among Houses

Given a set of houses, write a dynamic programming solution to determine the minimum cost of placing routers to provide coverage for all houses. The…

Companies: LinkedIn

Last reported Apr 2026

Debug a Concurrent Job Scheduler

Companies: OpenAI

Concurrency · Debugging

Last reported Apr 2026

Design an Extensible Simulation Engine

Companies: OpenAI

Low-Level Design (OOP) · Simulation & State Machines

Last reported Apr 2026

Word Processing

Implement a solution that processes and manipulates a collection of words or strings. The solution should handle common word-based operations such as searching, sorting, or…

Companies: Meta

Last reported Apr 2026

Compute a Global Mode Across Distributed Partitions

Companies: Anthropic

Batch & Stream Processing · Partitioning & Consistent Hashing

Last reported Mar 2026

Compute an Exact Distributed Median with Limited Communication

Companies: Anthropic

Batch & Stream Processing · Binary Search

Last reported Mar 2026

Multithreaded File Copy Command

Design a Linux `cp` command that copies a file from source to destination using only `pread()` and `pwrite()` system calls. Your implementation must support multithreading…

Companies: Rubrik

Last reported Mar 2026

CSV Duplicate Record Removal

Write a script to ingest a CSV file and remove duplicate records efficiently. Validate your approach using progressively larger test files, leveraging AI to refine…

Companies: Microsoft

Last reported Mar 2026

C++ Code Bug Identification and Best Practices Review

Review the provided C++ code to identify bugs and violations of coding best practices. Explain the issues found and suggest improvements.

Companies: Google

Last reported Mar 2026

How do you review a design document?

Companies: Anthropic

System Design Fundamentals

Last reported Mar 2026

Build a chatbot with company-specific knowledge base

Design and implement a chatbot system that can answer questions using a company's internal knowledge base and documents. Consider the architecture, data ingestion, retrieval…

Companies: Intuit

Last reported Feb 2026

Implement and Optimize a K-Nearest Neighbors Classifier

Build a KNN classifier that handles edge cases like tie-breaking, data quality issues, and feature scaling. Address production concerns including noisy data, identical feature…

Companies: Intuit, Yahoo

Last reported Feb 2026

Preventing Prompt Injection Attacks

Design and implement security measures to protect an AI system from prompt injection attacks where malicious users attempt to manipulate the model's behavior through crafted…

Companies: Intuit

Last reported Feb 2026

Model particle hits on a screen

Companies: OpenAI

Probability

Last reported Feb 2026

Analyze matrix multiplication complexity

Companies: OpenAI

Last reported Feb 2026

Explain multithreading vs multiprocessing

Companies: Anthropic

Concurrency · Operating Systems

Last reported Feb 2026

Improve concurrency beyond a single lock

Companies: Anthropic

Concurrency

Last reported Feb 2026

Explain CPU-Bound vs I/O-Bound Work

Companies: Anthropic

Concurrency · Programming Languages

Last reported Jan 2026

Explain KV cache in Transformer inference

Companies: OpenAI

LLM Inference & Serving · Transformers & Attention

Last reported Jan 2026

Explain what torch.distributed.barrier does

Companies: OpenAI

Neural Networks & Training

Last reported Dec 2025