System Design Arcade vs InterHub

NEW: THE AI ARCADE. Eight games on the system design round that didn't exist three years ago: RAG, LLM serving, embeddings, guardrails, and GPU fleets. Free, no subscription, and it plays offline. The system design interview is the one where the whiteboard goes blank. You've read the books. You've watched the videos. But when the interviewer says "design Instagram," or now "design a retrieval system for our support bot," you freeze, because reading about consistent hashing at 2am is not the same as knowing it cold. System Design Arcade is the fix. It turns every building block into 60-second arcade levels you can actually finish. On the subway. In line for coffee. While waiting for CI. On a plane with no Wi-Fi. THE AI ARCADE AI engineering is its own interview round now, and most prep hasn't caught up. The AI Arcade drills the systems behind it: - Design a RAG System: chunk boundaries, hybrid retrieval, reranking, and the permission bug that ends careers - LLM Serving: batching, KV caches, streaming, and GPU memory as the binding constraint - Feed Ranking: retrieval, ranking, and the feedback loop that decides what a model can ever learn - Embeddings: what "similar" means, how many dimensions you need, and migrating models without silent breakage - Feature Stores: one definition, two readers, and point-in-time correctness between training and serving - ML Observability: catching a model that is wrong while every dashboard stays green - AI Guardrails: where the checks sit, prompt injection from untrusted text, and what a model is allowed to reach - GPU Infrastructure: memory, interconnect, scheduling, and the bill FIVE TRACKS, ONE CURRICULUM Concept Arcade: master one building block at a time. Caches, databases, queues, replication, sharding, load balancing. Problem Arcade: design complete systems end to end. URL Shortener, Rate Limiter, News Feed, Chat, Ride Sharing, and a new Key-Value Store. The classics, played out like boss fights. Tool Arcade: hands-on drills with the infrastructure you'll use on the job. Redis. Kafka. Docker. Kubernetes. And Vector Vault, the vector store behind semantic search. AI Arcade: the eight games above. Story Mode: narrative capstones that walk an onsite round end to end: a Twitter-style home timeline, a chat system, Dropbox, typeahead search, a rate limiter, and a URL shortener. CHALLENGE TYPES THAT DON'T FEEL LIKE FLASHCARDS Multiple choice, ordering puzzles, fill-in-the-blank, API Builder, Architecture Builder, and Scenario-Why drills. Each level mixes formats so your brain has to actually engage. The Scenario-Why drills train the reasoning behind the answer, not just the answer. REVIEW THAT SPACES ITSELF OUT Miss a challenge and it comes back in Power-Up Review. Clear it and it returns on a widening schedule, so what you learn stays learned. DAILY CHALLENGE A fresh challenge every day, the same one for you and your study buddy. Streak counter. Optional reminder notifications, opt in from Settings. BUILT FOR YOUR EYES Retro arcade aesthetic by default. Pixel fonts. Neon glow. Prefer something softer? Switch to the playful sticker-card vibe, or open the Theme Lab and tune background, glow, gradient, and font until it feels right. Read Aloud narrates every explanation, so you can learn while you walk. YOUR PROGRESS STAYS YOURS Start playing instantly: Level 1 of every game needs no account. A free sign-in with Apple, Google, GitHub, or email unlocks every level and backs up your progress across your iPhone and iPad. Progress saves on your device. We use product analytics to see which levels need work, never the content of your answers. FREE TO PLAY No ads. No paywalls. No subscription. Every level is free with a free account. New games ship every sprint. Start with Level 1.

Build the technical fluency to walk into your next interview prepared. InterHub turns interview prep into a structured, adaptive practice routine, built specifically for software engineers targeting junior, mid, and senior roles. Pick your career path - backend, frontend, fullstack, mobile, DevOps, or AI, choose the technologies you actually use, set a target seniority, and InterHub generates a learning plan that adapts to your answers. Every session you complete sharpens the next one. WHY ENGINEERS USE INTERHUB: Adaptive Question Sessions Questions are selected based on your career path, chosen stack, and how you've answered previously. The system tracks weak topics and reinforces them - no padding, no filler, no cramming a curriculum that doesn't match your goal. Realistic Mock Interviews Run full mock interviews end-to-end. Answer by typing or by speaking, voice answers are transcribed and scored just like a real interviewer would assess your reasoning. Each interview ends with an overall verdict, per-question scores, and structured feedback you can act on. Progress Tracking That Reflects Reality Track your level per technology and across the radar of skills your target role requires. Snapshots over time show whether you're actually closing the gap to the seniority you're aiming for, or only practicing what you already know. Practice Mode for Daily Reps Short, focused sessions for the days you have ten minutes between meetings. Local on-device speech recognition means you can practice out loud without anything leaving your phone unless you opt in to cloud transcription for higher accuracy. WHAT'S INCLUDED: Career paths for backend, frontend, fullstack, mobile, DevOps, and AI/ML roles Question banks across the most common stacks (React, Django, Python, Node, TypeScript, and more) Junior, mid, and senior difficulty calibration Mock interviews with scoring and written feedback Voice or text answers, with on-device transcription by default Progress snapshots and per-technology level tracking Daily practice reminders at a time you choose INTERHUB PREMIUM: Premium unlocks unlimited mock interviews, the full question library across all paths, voice answer grading, and the complete progress dashboard. Available as a monthly or annual subscription. New users get a 7-day free trial. Payments and renewal: Payment is charged to your Apple ID at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or turn off auto-renew in your Apple ID account settings at any time after purchase. No cancellation of the current subscription is permitted during an active billing period. PRIVACY: InterHub does not include any analytics or advertising SDKs. We do not collect IP addresses, location, contacts, or photos. Voice answers are transcribed locally on your device by default; cloud transcription is opt-in. See our privacy policy for the full list of sub-processors and data flows. Terms and conditions: https://interhub.tech/legal/terms-and-conditions Privacy policy: https://interhub.tech/legal/privacy-policy