Mental Math Drills for Trading Interviews: How to Pass the Test
5 min read Mental Math Drills for Trading Interviews: How to Pass the Test The mental math test is the gatekeeper at most […] Read article
Quant Finance
Quant Finance
Options Pricing for Quant Interviews: Black-Scholes, Greeks, and Put-Call Parity
9 min read Options Pricing Basics for Quant Interviews: Black-Scholes, Greeks, Put-Call Parity Options pricing comes up in nearly every quant interview at Read article
Quant Finance
Probability Brainteasers for Quant Interviews: Dice, Coins, Cards, Urns
9 min read Probability Brainteasers for Quant Interviews: Dice, Coins, Cards, Urns Quant interview rounds at Jane Street, Citadel, Two Sigma, Optiver, SIG, Read article
Quant Finance
Breaking Into Quant Finance and Wall Street: 2026 Interview Guide
10 min read Breaking Into Quant Finance and Wall Street: 2026 Guide Quant finance and Wall Street technology are a parallel universe to Read article
System Design
System Design: Design Waymo Autonomous Ride-Hailing — Fleet Management, Remote Assistance, HD Mapping, Safety
6 min read Waymo operates a fully autonomous ride-hailing service (no human safety driver) across multiple US cities. Designing an autonomous ride-hailing platform Read article
System Design
System Design: Staff+ Engineer Interview — Architecture Tradeoffs, Technical Vision, Cross-Team Influence, RFC Process
6 min read Staff+ (L6/L7) system design interviews evaluate a different dimension than senior (L5) interviews. At the staff level, you are not Read article
System Design
System Design: Design Tesla Autopilot — Autonomous Driving, Sensor Fusion, Perception, Path Planning, Real-Time ML
5 min read Tesla Autopilot processes data from cameras, radar, and ultrasonic sensors to navigate roads autonomously. Designing an autonomous driving system tests Read article
System Design
System Design: Design Calendly — Scheduling Platform, Availability, Booking, Timezone, Integration, Conflict Detection
6 min read Calendly automates scheduling for millions of professionals by eliminating the back-and-forth of finding a mutual time. Designing a scheduling platform Read article
System Design
System Design: Design Kafka — Distributed Event Streaming, Partitions, Consumer Groups, Exactly-Once, Compaction
6 min read Apache Kafka processes trillions of events per day at companies like LinkedIn, Netflix, Uber, and Airbnb. Designing Kafka itself — Read article
System Design
System Design: Design Notion AI / Knowledge Base AI — Semantic Search, Document QA, Embeddings, Context Retrieval
6 min read AI-powered knowledge bases (Notion AI, Confluence AI, Glean) answer questions by searching and synthesizing information from organizational documents. Designing a Read article
System Design
System Design: Design GitHub Actions — CI/CD Platform, Workflow Engine, Runner Architecture, Artifact Storage, Secrets
6 min read GitHub Actions processes millions of workflow runs per day for millions of repositories. Designing a CI/CD platform tests your understanding Read article
Coding Interview Questions
Coding Interview: Salary Negotiation After Technical Interview — Offer Evaluation, Competing Offers, Equity, TC
7 min read The technical interview is only half the battle — the other half is negotiating your offer. Engineers routinely leave $50K-$200K Read article
System Design
System Design: Design Coinbase Crypto Exchange — Wallet Custody, Trading Engine, Blockchain Integration, Compliance
6 min read Coinbase serves 100+ million users trading cryptocurrencies with $200+ billion in custodied assets. Designing a crypto exchange tests your understanding Read article
System Design
System Design: Design Electronic Trading Platform — Order Book, Matching Engine, Market Data, Low Latency, Colocation
7 min read Electronic trading platforms process millions of orders per second with microsecond-level latency. Designing a trading system tests your understanding of: Read article
System Design
System Design: Design Shopify — E-Commerce Platform, Multi-Tenant, Storefront, Checkout, Inventory, Themes, Apps
6 min read Shopify powers 4+ million online stores across 175 countries, processing $200+ billion in GMV annually. Designing a multi-tenant e-commerce platform Read article