System Design Interview Roadmap

System Design Interview Roadmap

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Indexes: B-Tree, Hash, Composite, Covering
Indexes are the most commonly mentioned and least explained element in system design interviews.
AI Gateway Patterns: Rate Limiting and Cost Control for LLM APIs
A team at a mid-size fintech shipped a support-ticket summarizer in March.
Design a Distributed Task Queue (Celery/SQS) — Walkthrough
Archetype: Infrastructure & Platform · Asked at: Amazon, Shopify, Stripe
Handling Questions You Haven't Seen
You will get a question you haven’t drilled. This is guaranteed. The point of the question bank is pattern recognition, not memorization.
Multi-Modal System Design — Handling Text, Image, and Audio Simultaneously
A customer uploads a 40-second phone video of a leaking pipe and types “is this covered under my policy?” One request, three payloads: a text question…
Design Reddit’s Front Page — Walkthrough
The probe
The Hardest Question in the Question Bank
Of the 52 questions in the system design bank, one comes up in cohort feedback more than any other.
LangChain & LlamaIndex Internal Architecture: How Orchestration Frameworks Work
A team at a 30-person fintech startup wires up a LangChain agent to answer support tickets: check account balance, look up a transaction, escalate if…

September 2026

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