Backend and databases

• Node.jsPractice

  0/16 lessons

  1. What Node.js is55 min
  2. Modules55 min
  3. npm and packages55 min
  4. Files, events and streams55 min
  5. Environment variables55 min
  6. Module assignment: Log statistics tool90 min
  7. Event loop and timers50 min
  8. Promises and async/await55 min
  9. Errors, unhandled rejections and exit codes45 min
  10. Paths and __dirname35 min
  11. Buffers and text encoding40 min
  12. Child processes45 min
  13. Signals and graceful shutdown40 min
  14. Reading JSON and config files safely35 min
  15. Dates, timestamps and time zones40 min
  16. ES modules vs CommonJS in practice45 min

  Module quiz

• ExpressPractice

  0/13 lessons

  1. Your first server and routing50 min
  2. Request and response55 min
  3. Middleware and error handling55 min
  4. Structuring an Express project55 min
  5. Module assignment: Tasks API90 min
  6. Route parameters and router.param40 min
  7. File uploads with multer45 min
  8. Async handlers in Express 535 min
  9. Request logging and request IDs40 min
  10. Serving static files and frontend builds40 min
  11. Streaming responses and server-sent events45 min
  12. Health and readiness endpoints40 min
  13. Dependency injection in Express40 min

  Module quiz

• REST APIsPractice

  0/13 lessons

  1. REST principles and status codes50 min
  2. Building a CRUD API55 min
  3. Validation and pagination55 min
  4. Versioning and testing an API55 min
  5. Module assignment: Library loans API55 min
  6. Idempotency keys for POST45 min
  7. Partial updates with PATCH40 min
  8. ETags and If-Match40 min
  9. Cursor-based pagination45 min
  10. Bulk endpoints40 min
  11. Problem details for errors35 min
  12. Hypermedia links45 min
  13. Long-running jobs with 202 Accepted50 min

  Module quiz

• Authentication and SecurityPractice

  0/16 lessons

  1. Hashing passwords50 min
  2. Sessions, JWT and cookies55 min
  3. Building login with JWT in Express55 min
  4. Authorization and OAuth55 min
  5. Security basics for web apps55 min
  6. Module assignment: Secure notes API55 min
  7. Rate limiting algorithms40 min
  8. Refresh token rotation and reuse detection45 min
  9. Password reset tokens45 min
  10. Two-factor login with TOTP55 min
  11. API keys with hashing and scopes40 min
  12. Secrets management and key rotation40 min
  13. Content Security Policy45 min
  14. Dependency audits and supply chain risk45 min
  15. HTTPS, TLS and HSTS35 min
  16. Audit logs without secrets35 min

  Module quiz

• MongoDBPractice

  0/16 lessons

  1. Documents and CRUD55 min
  2. Queries and indexes55 min
  3. The aggregation pipeline55 min
  4. Mongoose models and validation55 min
  5. Schema design: embed or reference55 min
  6. Module assignment: Reading club API55 min
  7. BSON types and ObjectId40 min
  8. Update operators50 min
  9. Querying arrays with $elemMatch35 min
  10. Compound indexes and the ESR rule40 min
  11. Text search indexes40 min
  12. $facet and $bucket reports40 min
  13. Change streams40 min
  14. Multi-document transactions with sessions40 min
  15. Mongoose populate and virtuals45 min
  16. TTL indexes and expiring data40 min

  Module quiz

• SQL FundamentalsPractice

  0/14 lessons

  1. Tables and SELECT55 min
  2. Filtering, sorting and NULL55 min
  3. Aggregates, GROUP BY and HAVING55 min
  4. Changing data and constraints55 min
  5. Module assignment: Bookshop ledger55 min
  6. Data types for real columns40 min
  7. Text matching with LIKE and string functions40 min
  8. Dates and times in SQL40 min
  9. CASE expressions35 min
  10. Conditional aggregation40 min
  11. DISTINCT and set operations40 min
  12. COALESCE and NULLIF40 min
  13. Multi-row INSERT, UPDATE FROM and RETURNING45 min
  14. Upserts with ON CONFLICT35 min

  Module quiz

• SQL Joins and Database DesignPractice

  0/16 lessons

  1. Joins55 min
  2. Subqueries and CTEs55 min
  3. Window functions55 min
  4. Keys, normalization and indexes55 min
  5. Transactions and ACID55 min
  6. Module assignment: Stationery shop database55 min
  7. Many-to-many junction tables45 min
  8. Foreign keys and ON DELETE rules50 min
  9. Views and materialized views40 min
  10. Reading EXPLAIN plans45 min
  11. Composite and covering indexes40 min
  12. Deadlocks and lock ordering45 min
  13. Denormalization on purpose40 min
  14. Window frames and named windows40 min
  15. ROLLUP, CUBE and GROUPING SETS45 min
  16. Soft deletes and optimistic locking45 min

  Module quiz

• ORMs and MigrationsPractice

  0/14 lessons

  1. What an ORM is and defining a schema50 min
  2. Migrations55 min
  3. Queries and relations55 min
  4. The N+1 query problem55 min
  5. Transactions, seeding and using Drizzle in Express55 min
  6. Module assignment: Library lending data layer90 min
  7. Prepared statements and parameter binding40 min
  8. Raw SQL with the sql tag40 min
  9. The repository pattern40 min
  10. Connection pooling with pg45 min
  11. Keyset pagination with an ORM45 min
  12. Inferring types from the schema40 min
  13. Enums and check constraints in the ORM45 min
  14. Comparing Prisma and Drizzle45 min

  Module quiz

• TestingPractice

  0/8 lessons

  1. The testing pyramid35 min
  2. The built-in node:test runner40 min
  3. Vitest basics40 min
  4. Mocks, stubs and fakes45 min
  5. Integration tests with supertest40 min
  6. Testing against a real database50 min
  7. Test data factories40 min
  8. Coverage and what it misses40 min

• Debugging LabsPractice

  0/6 lessons

  1. Reading stack traces35 min
  2. Debugging with node --inspect40 min
  3. Structured logging40 min
  4. Finding memory leaks45 min
  5. Lab: bug hunt in a broken API45 min
  6. Lab: race condition in a counter40 min

• Build-Along ProjectsPractice

  0/6 lessons

  1. Project: URL shortener50 min
  2. Project: Expense tracker60 min
  3. Project: Chat message API45 min
  4. Project: Inventory service45 min
  5. Project: Blog API50 min
  6. Project: Background job worker55 min

• Caching and PerformancePractice

  0/6 lessons

  1. Why caching helps and where it lives35 min
  2. Cache-Control and max-age35 min
  3. In-memory caching with an LRU45 min
  4. Redis basics50 min
  5. Cache invalidation strategies45 min
  6. Load testing with k645 min

• Kafka and Event StreamingPractice

  0/14 lessons

  1. What Event Streaming Is and Where Kafka Fits35 min
  2. Topics, Partitions and Retention40 min
  3. Brokers, Replicas and Leaders40 min
  4. Running Kafka Locally with Docker35 min
  5. Producers, Keys and Ordering35 min
  6. Producer Acks, Retries and Idempotence40 min
  7. Consumers and Consumer Groups45 min
  8. Offsets and Committing45 min
  9. Delivery Guarantees45 min
  10. Rebalancing and Consumer Lag45 min
  11. Retries and Dead-Letter Topics45 min
  12. Message Schemas and Evolution50 min
  13. Kafka Versus a Queue40 min
  14. Build an Event Pipeline in Node50 min

• MicroservicesPractice

  0/14 lessons

  1. Monolith versus services35 min
  2. Service boundaries35 min
  3. Splitting a monolith step by step45 min
  4. REST calls between services50 min
  5. Messaging between services40 min
  6. Event contracts and versioning40 min
  7. API gateway45 min
  8. Service discovery45 min
  9. Timeouts and retries50 min
  10. Circuit breaker45 min
  11. Data per service45 min
  12. Saga pattern50 min
  13. Tracing across services40 min
  14. Project: Order, stock and payment services60 min

• GraphQL APIsPractice

  0/12 lessons

  1. What GraphQL Is and Where It Fits35 min
  2. Schema and Types40 min
  3. Queries and Field Selection40 min
  4. Mutations and Input Types40 min
  5. Resolvers and the Execution Model40 min
  6. Building a Node GraphQL Server45 min
  7. The N+1 Problem in GraphQL40 min
  8. DataLoader Batching and Caching45 min
  9. Authentication and Authorization in Resolvers40 min
  10. Pagination with Connections40 min
  11. Errors and Partial Responses40 min
  12. GraphQL versus REST in Practice40 min

• Cloud DatabasesPractice

  0/12 lessons

  1. Managed vs Self-Hosted Databases40 min
  2. Choosing a Data Store40 min
  3. Managed Postgres: Networking and TLS40 min
  4. Connection Limits and Pooling in the Cloud40 min
  5. DynamoDB Partition and Sort Keys45 min
  6. DynamoDB Query, Scan, and Indexes50 min
  7. DynamoDB Conditional Writes and Transactions50 min
  8. Firebase Firestore Documents and Security Rules50 min
  9. Supabase Postgres with Row Level Security50 min
  10. Backups, Point-in-Time Restore, and Restore Drills55 min
  11. Migrating a Database with Minimal Downtime45 min
  12. Cloud Database Cost and Capacity Planning40 min

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