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Lessons (17)

• ACID, Transactions & Locks

  Make multi-step changes correct with atomic transactions, isolation choices, constraints and short-lived locks. The bank-transfer …

• Design a Reliable Notification System

  Deliver email, SMS, push and in-app messages with preferences, isolation, idempotency, provider failover and auditable states. ![Notification …

• Database Indexing & Transactions

  … Learn how B-tree indexes work, how to read a query plan, and how isolation levels prevent concurrency …

• Microkernel (Plugin) Architecture

  … catch plug-in errors, timeouts One bad plug-in shouldn't crash the host Isolate security where plug …

• Monolith vs Microservices

  … team contention, scaling differences, isolation needs. - Avoid the distributed monolith: no shared databases, no lock-step deploys.

• Design an E-Commerce Checkout

  … Handle unknown provider outcomes through reconciliation; expire reservations; isolate checkout capacity from bulk exports and marketing traffic.

• Batch vs Stream and Data Modeling

  … Batch jobs need isolation so reporting cannot starve checkout. A denormalized projection needs an owner and a measurable …

• Design a Logging and Monitoring Platform

  … Preserve tenant isolation, retention controls and an audit trail. Measure ingestion lag, dropped samples, query latency, cardinality and …

• Flash Sale: 10 Million Buyers, No Oversell

  … Give every purchase an idempotency key, reconcile reservations/orders/payments, and isolate sale traffic from browsing and recommendations.

• Transactions, Indexes & Concurrency

  … Atomicity is all-or-nothing; consistency preserves constraints; isolation defines concurrent visibility; durability survives failure. Never wait for …

• Storage Engines & Database Operations

  … Keep independent backups, define retention, encrypt them, and test restoring a realistic dataset into an isolated environment. Know …

• Replication, Partitioning & Sharding

  … tenant id is often safer than an arbitrary hash when tenancy is a hard isolation boundary. Avoid hot …

• Resilience Patterns

  … const recs = await breaker.fire(userId); 4. Bulkhead: isolate resources Ships are divided into watertight compartments ( bulkheads ). A …

• Clean Architecture

  … fast tests, swappable infrastructure, business rules you can read in isolation.

• Delivery Guarantees: At-Most, At-Least & Exactly Once

  … retried throw error; } }, }); Consumers of ledger must use isolation.level=read committed so they skip records from aborted …

• Docker & Containers

  … GBs MBs Starts in Minutes Seconds or less Isolation Strong (separate kernel) Good (shared kernel, namespaces) Density ~10s …

• Frontend Testing Strategy

  … typos and type bugs Unit One function in isolation Vitest / Jest ⚡⚡ Logic is correct Integration / component ⭐ Components working …