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Mental models, patterns, Java/Python/Go primitives, lock-free programming, debugging.

Object-oriented design problems with class diagrams and design patterns.

Kernel, processes, memory, networking stack, debugging tools.

TCP/IP, HTTP, TLS, DNS, RFCs, and how the internet really works.

Load balancers, queues, caches, databases, observability, security.

Consensus, replication, sharding, probabilistic data structures, geospatial indexing.

Pattern-based solutions in Python, Go, and Java for coding interviews.

Quick-reference for foundations, networking, data, distributed systems, AI, and more.

Real interview problems with hints, follow-ups, and full walk-throughs.

Deep dives on the technologies that power modern systems.

Trade-off frameworks for the choices that shape your system.

Internal developer platforms, golden paths, and platform org patterns.

Common failure modes, detection, mitigation, and post-mortem patterns.

DORA, SPACE, cost attribution, capacity planning.

SOC 2, GDPR, audit trails, data classification, access reviews.

Hiring, mentoring, decision-making, technical strategy at scale.

Team topologies, conway's law, scaling structures.

Interview prep for staff and principal-level engineers.

Interactive calculators, visualizers, and simulators for system design.

In-depth system design articles and technical deep dives.

• BGP: The Backbone Protocol That Powers Global DNS and Content Delivery
• Building a Fail-Safe, Scalable Top-K Streaming System
• Building a Multi-Tenant AI Agent Platform for Restaurant Intelligence
• ClickHouse Capabilities: A Quick Overview
• CockroachDB vs Google Spanner: A Deep Dive Beyond the Basics
• Designing a Multi-Tenant, Globally Scalable Tagging System
• Embracing Domain-Driven Design: A Deep Dive into Core Concepts
• End-to-End Encryption in Chat Applications
• How Apache Iceberg powers the Data Lake and Trino Makes It Explorable
• How Apache Pinot Achieves Ultra-Low Latency Analytics for User-Facing Applications
• How Distributed Databases Handle Conflicts: Vector Clocks, Syncing, and Conflict Resolution
• How Google Spanner Achieves Global Consistency
• No Humans Allowed: Inside Moltbook, the AI-Only Social Network — Build and Deploy Your Own Autonomous Agent
• Observability Platform at Scale - Metrics, Traces, Logs, and Profiles
• Passwordless Authentication's Silent Choice: Trust vs Privacy
• QUIC and WebTransport: Rebuilding the Internet for the Real World
• RAG and LLM Platform at Scale: Ingestion, Retrieval, Generation, and Evaluation for 10M Queries/Day
• Securing Access: The Power of RBAC, ABAC, and ReBAC
• System Design: Ad Click Aggregator (10B Clicks/day, Lambda Architecture, Fraud Detection)
• System Design: Ad Exchange (Real-Time Bidding, Sub-100ms Auctions, DSP/SSP, Impression Serving)
• System Design: AI Software Engineer (From Autocomplete to Autonomous App Builder)
• System Design: Dropbox (File Sync, Chunking, and Deduplication)
• System Design: E-Commerce Flash Sales (10M Users, Coupon System, One-Per-User Enforcement)
• System Design: GitHub (200M Repos, Git Object Storage, Sparse Trigram Code Search, Per-Job VM CI)
• System Design: Job Scheduler (10M Jobs/day, DAG Dependencies, Effectively-Once Execution)
• System Design: LeetCode (Code Sandbox, Container Isolation, Real-Time Contests)
• System Design: Maps Platform (Navigation, Routing, and Map Rendering)
• System Design: News Aggregator (100K Sources, Dedup, Personalized Ranking)
• System Design: Notification Platform, 100M Notifications/Second
• System Design: Object Storage (Erasure Coding, Flat Namespace, and Exabyte Scale)
• System Design: Online Auction (50K Bids/sec, Effectively-Once Settlement, Anti-Sniping)
• System Design: Real-Time Collaborative Editor
• System Design: URL Shortener (10B Short URLs, 100K Redirects/sec)
• x402: Can HTTP 402 Power Payments for AI Agents?