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Ace Your Technical Interview

2,000+ in-depth guides on system design, coding patterns, data structures, algorithms, and company-specific prep. Deep dives on distributed systems, graph algorithms, interview playbooks.

2,464 Guides 1,439+ System Design 381+ Company Guides
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1,439+ guides

System Design

From URL shorteners to Netflix-scale video streaming. Architecture, database internals, distributed systems, and infrastructure.

URL ShortenerTwitter FeedRate LimiterDistributed Cache
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250+ guides

Coding Patterns

Two pointers, sliding window, dynamic programming, trees, graphs, backtracking. Templates and problem-solving frameworks.

Two PointersSliding WindowDPBacktracking
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381+ companies

Company Guides

Interview formats, common questions, and prep strategies for Google, Meta, Amazon, Apple, Stripe, OpenAI, Jane Street, and more.

// prompt library

Interview Prep Prompts

Copy-and-run prompts that turn ChatGPT, Claude, or Gemini into a mock interviewer, a system-design critic, a resume reviewer, or a negotiation coach. Fill in the blanks, paste, and make the model grade you.

// negotiation

Break an offer down into real four-year numbers

Turns an offer letter into year-by-year total compensation, lists the terms the letter left out, and gives you the questions to ask before you compare anything.

Open prompt → // system design

Grade your system design like a staff engineer would

Takes a design you have already written and returns the three hardest follow-ups, the weakest component, and a scorecard, instead of praise.

Open prompt → // behavioral

Mine your experience for a bank of behavioral stories

Interviews you about your own career, ten questions one at a time, then maps what it heard onto the standard question families and shows the gaps.

Open prompt →
Browse all interview prep prompts →

System Design Interview Guides

The most comprehensive system design resource online. Each guide covers architecture, tradeoffs, and production patterns.

URL Shortener Twitter News Feed Chat System (WhatsApp) Rate Limiter Notification System Video Streaming (Netflix) Payment System Ride Sharing (Uber) Distributed Cache Key-Value Store Search Autocomplete Collaborative Editor
View all system design guides →

Coding Interview Patterns

Master the patterns that cover 90% of coding interview problems.

Dynamic Programming Two Pointers & Sliding Window Binary Search Tree Traversals Graph Algorithms Backtracking Monotonic Stack Union-Find Bit Manipulation Heap / Priority Queue Prefix Sum Linked List Patterns
View all coding patterns →

Famous Interview Questions

The cultural canon — brainteasers, coding classics, and behavioral set-pieces that shaped tech and Wall Street hiring. The story of each question, what it actually tests, and whether it is still asked in 2026.

Cultural Canon Hub FizzBuzz: From 2007 Filter to Meme Invert a Binary Tree (Max Howell) Why Manhole Covers Are Round Mount Fuji & The Brainteaser Era Ant on a Clockface Pirates Dividing Gold Tell Me About Yourself Greatest Weakness Tell Me About a Time You Failed Trapping Rain Water: The Journey The Cracking the Coding Interview Effect
View all famous interview questions →

// breaking into wall street

Breaking Into Wall Street

Bank and trading-firm tech interviews run their own game: HackerRank gates, Superdays, probability rounds for strats, and comp that works nothing like big tech. Guides for the bulge brackets and the quant shops, written for engineers.

All Wall Street guides → Goldman Sachs JPMorgan Morgan Stanley Jane Street Citadel

// video interview tech

Look and Sound Like a Serious Candidate

Buying guides for the gear that matters on a video interview: webcams, microphones, lighting, backgrounds, and the rest. One pick per budget in each category, chosen from independent reviews, with the interview-specific reason.

Best lighting for video interviews

A small light at the right angle fixes the raccoon-eyes look that ceiling lights and windows behind you create.

our pick: Elgato Key Light Neo with Clamp

Best microphones for video interviews

A desktop mic that makes you easy to listen to for an hour, even in an apartment with a road outside.

our pick: Shure MV6 USB Gaming Microphone

Best webcams for video interviews

The one upgrade interviewers notice first: a sharper, better-exposed face than any laptop camera can manage.

our pick: Insta360 Link 2C
All video interview gear guides →

Study Roadmaps by Experience Level

Beginner (0-1 years)

Data structures fundamentals, basic algorithms, Big-O notation, and your first coding problems.

Intermediate (2-4 years)

Advanced patterns, system design introduction, behavioral prep, and company-specific strategies.

Advanced (5+ years)

Staff+ system design, distributed systems deep dives, leadership principles, and architecture tradeoffs.

Company Interview Guides

Know exactly what to expect. Interview formats, question types, and prep strategies.

1Password 23andMe Abridge Adobe Adyen Affirm Airbnb Airbyte Airtable Akamai Akuna Capital Algolia Alibaba Amazon Ambience Healthcare AMD American Express Amplitude Anduril Industries Anthropic Anyscale Apollo.io Apple Apple Silicon Team Applied Materials AppLovin AQR Capital Management Asana Assort Health Astronomer Atlassian Bank of America / BofA Securities Barclays Baseten Beehiiv Belvedere Trading BigCommerce Black Forest Labs BlackRock Blackstone Blizzard / Activision Block Bloomberg Blue Origin Bluesky Booking.com Box Braze Brex Bridgewater Associates Broadcom Bumble ByteDance / TikTok Calm Canva Capital One CarGurus Carta Cartesia Carvana Character.AI Chicago Trading Company Chime Chronosphere Circle, Ripple, and Chainalysis CircleCI Cisco Interview Citadel Citadel Securities Citi Clerk ClickHouse ClickUp Cloudera Cloudflare Cockroach Labs Coda Codecademy CodeSandbox Cohere Coinbase Commure Confluent Contextual AI ConvertKit / Kit CoreWeave Coursera Credit Karma Cribl CrowdStrike Crusoe Cursor D. E. Shaw Dagster Databricks Datadog DataStax dbt Labs Decagon Deel Deepgram Defense Primes Deutsche Bank Discord DocuSign Doppler Drata Dropbox DRW DuckDB Labs Duolingo Elastic Electronic Arts ElevenLabs Epic Games Epic Systems Etsy Eventbrite Evercore Exa Factory AI Faire fal.ai Fastly Fidelity Investments Figma Fireworks AI Five9 Fivetran Flow Traders Fly.io Framer Gainsight Galaxy Digital Genspark GitLab Glassdoor Glean Goldman Sachs Gong Google Grab Grafana Labs Greenhouse Grubhub GTS Gusto HackerRank Harvey HashiCorp Headspace Heroku Hex Hightouch Hippocratic AI Honeycomb Hopper HSBC HubSpot Hudson River Trading Hugging Face IMC Trading Indeed Infinitus Systems Instacart Intel Intercom Iterable Jane Street Jefferies JetBrains JPMorgan Chase Jump Trading KLA Klarna Klaviyo Kraken Lambda Labs LangChain Lattice LaunchDarkly Lazard LeetCode Legora Lightspeed Commerce Linear LinkedIn LiveKit LlamaIndex Luma AI Lyft Mach Industries Magic.dev Mailchimp Man Group Marqeta Mastercard Match Group Materialize Medium Mercor Mercury Meta Microsoft Millennium Management Mistral AI Mixpanel Modal Monday.com MongoDB Morgan Stanley MotherDuck Neon Netflix New Relic Niantic NK Securities Nomura Notion Novartis Nvidia NVIDIA Okta OpenAI Opendoor OpenEvidence OpenRouter Optiver Oracle Interview Orca Security Outreach Oxide Computer PagerDuty Palantir Palo Alto Networks Parallel Patreon PayPal PEAK6 Peloton Pendo Perplexity Physical Intelligence Pika Labs Pinecone Pinterest Interview Plaid PlanetScale Point72 Poolside PostHog Postman Prime Intellect Procore Pulumi Qdrant Qualcomm Quora Ramp Rapid7 RBC Capital Markets Reddit Interview Redfin Reflection AI Reka AI Renaissance Technologies Render Replicate Replit Resend Retool Rillet RingCentral Riot Games Rippling Robinhood Roblox Rogo Rubrik RunPod Runway Sakana AI Salesforce Salesloft Samsung Electronics SAP Interview Saronic Scale AI SentinelOne Sentry ServiceNow Shield AI Shopify Sierra SIG SingleStore Skild AI Skyscanner Smartsheet Snap Snowflake Snyk SoFi Sony SoundCloud Sourcegraph SpaceX Splunk Spotify Squarespace Stability AI State Street Stripe Substack Suno Supabase Sysdig Tailscale Taktile Talkdesk Teladoc Temporal Tempus AI Tenable Tencent Tennr TensorWave Tesla The Browser Company Tilde Tinybird Toast Together AI Tower Research Capital Tripadvisor True Anomaly Turbopuffer Turso Twelve Labs Twilio Twitch Two Sigma Uber UBS UiPath Unity Valkyrie Trading Vanguard Vanta Vast Veeva Systems Vercel Virtu Financial Vonage Wayfair Wealthfront Weaviate Webflow Weights & Biases Wells Fargo Whoop Wintermute Wise Wix Wiz Wolverine Trading Workato Workday WorkOS xAI XBOW XTX Markets Yelp Yugabyte Zapier Zendesk Zillow Zoom ZoomInfo Zscaler Zynga

Quick Reference

Big-O Complexity Cheat Sheet

Time and space complexity for every data structure and algorithm.

Algorithm Patterns Cheat Sheet

15 patterns with templates and when to apply each one.

Problems by Difficulty

Easy, medium, and hard problems organized for progressive practice.

Latest Guides

How Positron AI Interviews Chip and Inference EngineersSep 23 Inside the XDOF Interview for Robotics and Data EngineersSep 23 Inside the Gimlet Labs Interview for Inference-Infra EngineersSep 22 Inside the Lumilens Interview for Hardware and Systems EngineersSep 21 Inside Wayve's Engineering Interview LoopSep 21 How to pass the Nscale interview, the UK AI neocloudSep 20 Inside the Decart Interview for Real-Time Video AI EngineersSep 20 Inside Applied Intuition's Engineering Interview LoopSep 19

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