Learning paths
Courses & learning paths
Browse every MasterClass learning path: technology handbooks and interviews, system design case studies, and IELTS and professional vocabulary.
Curated Architectural Masterclasses & Learning Paths
Production-Grade System Design Blueprints & Tech Stacks
Designed for senior engineers, tech leads, and aspiring architects. Zero fluff, real-world distributed architectures, and interactive interview case studies built to stand up in production.
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12+System Design Architectures
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Technology & Stacks
Modern Full-Stack Engineering: React 19, Next.js 15, TypeScript & Rust
Complete hands-on curriculum: The React Compiler, async Server Components, Rust Tokio microservices, and PostgreSQL pgvector production deployment.
- ✓Ahead-of-time React Compiler memoization and eliminating useMemo/useCallback.
- ✓Next.js 15 asynchronous request headers, cookies, and partial prerendering (PPR).
- ✓High-throughput Rust services with Tokio async channel streaming and zero-copy JSON.
Next.js 15React 19RustTypeScript 5.8Postgres 17
System Design
System Design: Stripe-style Payment Gateway & Immutable Financial Ledger
Zero-loss financial transactions: two-phase commits, idempotency keys, Raft distributed consensus, double-entry bookkeeping, and fraud anomaly detection.
- ✓Distributed idempotency key enforcement using atomic Redis leases and Postgres transactions.
- ✓Double-entry bookkeeping math: assets = liabilities + equity with audit trail hash chains.
- ✓Deadlock-free concurrent wallet balance mutations with optimistic locking.
Double-Entry SQLRaft ConsensusRedis LocksKMS HSMKafka
System Design
System Design: Enterprise AI Automation Platform & Model Context Protocol
Building multi-agent autonomous systems: MCP tool server architectures, sandboxed code execution, streaming token state machines, and human-in-the-loop review.
- ✓Standard open MCP JSON-RPC tool endpoints with authentication and permission tiers.
- ✓Secure isolated Docker container pools with cgroup limits for untrusted agent code execution.
- ✓Streaming SSE token pipeline with verification checkpoints and rollback compensation.
Anthropic MCPPython FastAPIDocker SandboxesVector DBRedis
System Design
System Design: High-Concurrency Ticket Booking & Flash Sale Lock Engine
Zero-overselling distributed architecture: Redlock mutex algorithms, virtual waiting room queueing, seat matrix caching, and payment timeout webhooks.
- ✓Virtual waiting room rate limiting using token bucket algorithms during flash concert drops.
- ✓Sub-second seat reservation holds with TTL keys in Redis cluster.
- ✓Optimistic version checking in PostgreSQL to prevent race conditions across parallel checkouts.
Redis RedlockOptimistic LockingPostgreSQLKafkaNext.js 15
System Design
System Design: WhatsApp-style Ultra-High Concurrency Messaging
Architecting end-to-end encrypted bidirectional messaging, offline sync queues, read receipts, and cluster federation across 2 billion users.
- ✓Bidirectional connection pooling & heartbeat protocols for 10M live socket connections.
- ✓Signal protocol end-to-end encryption with ephemeral key ratcheting.
- ✓Distributed Cassandra time-series storage for message histories with zero-tombstone compaction.
WebSocketsErlang/RustCassandraRedisTLS 1.3
System Design
System Design: Netflix-style Adaptive Bitrate Video Streaming & Multi-CDN
Per-title chunked video encoding, adaptive bitrate switching (HLS/DASH), multi-CDN steering algorithms, and distributed viewing session state.
- ✓Dynamic adaptive bitrate ladder generation based on video complexity metrics.
- ✓Real-time client telemetry aggregation and automatic fallback between CDN providers.
- ✓Cassandra write-heavy bookmarking for instant resume playback across mobile and TV apps.
HLS / DASHFFmpegMulti-CDN SteeringCassandraEnvoy
System Design
System Design: Instagram-style Global Media Pipeline & CDN Edge Caching
High-throughput photo/video ingestion, asynchronous transcoding workers, pgvector semantic search, and multi-tier edge CDN invalidation.
- ✓Pre-signed direct S3 upload chunking with client-side SHA-256 integrity validation.
- ✓Distributed asynchronous transcoding cluster with adaptive quality tiers.
- ✓Vector embeddings search for explore feed personalization using HNSW index.
PostgreSQL 17pgvectorAWS CloudFrontFFmpegS3
System Design
System Design: Facebook-style Social Graph & Billion-User NewsFeed
Designing graph edge traversal, fan-out-on-write timelines, distributed Memcached clusters, and asynchronous notification backplanes.
- ✓Hybrid fan-out strategy (push for active followers, pull for celebrity accounts).
- ✓TAO graph data store architecture: nodes, associations, and distributed read replication.
- ✓Asynchronous notification indexing with Kafka partition keys and deduplication windows.
Neo4jMemcachedSharded MySQLKafkaGraphQL
System Design
System Design: Food Delivery Platform & Real-Time Geospatial Dispatch
UberEats/DoorDash architecture: QuadTree spatial partitioning, driver-order matching algorithms, live GPS streaming, and dynamic surge pricing.
- ✓Sub-millisecond driver lookup using Redis GeoRadius and hexagonal H3 indexing.
- ✓Hungarian algorithm for multi-order batching and optimal driver route scheduling.
- ✓Finite state machine for real-time kitchen order acceptance and pickup confirmation.
Redis GeoRadiusQuadTreeApache KafkaWebSocketsGo
IELTS & Vocabulary
IELTS Academic & Executive Tech English: Band 8.5+ Architecture Communication
Master senior engineering interview communication, architectural whitepaper writing, vocabulary precision, and English fluency with native voice feedback.
- ✓Precision technical vocabulary and avoiding ambiguity during staff architect presentations.
- ✓IELTS Academic Writing Task 1 & 2 blueprints tailored for software professionals.
- ✓Real-time audio pronunciation feedback powered by neural acoustic analysis.
ElevenLabs Audio AIIELTS AcademicVocabulary EngineGrammar
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