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Lessons (40)

• Developer Learning Plan and Document-Assistant Capstone

  … Save it as document search.py and run python3 document search.py . python import re documents = [ {"id": "deploy …

• Collaborative Document Editing & Real-Time Sync

  … The hard parts are ordering inside one document and hot documents , not raw throughput. 3. The core decision …

• I — Interface Segregation Principle

  … doc: Document): void; scan(doc: Document): Image; fax(doc: Document, number: string): void; staple(doc: Document): void; } // A …

• SQL vs NoSQL Databases

  Relational tables or flexible documents? Understand how each stores data, the four NoSQL families, ACID vs BASE, and …

• 500 Users Upload Documents at Once: Design the Background Job Pipeline

  Move slow document processing out of the HTTP request with object storage, a job table, a task queue …

• Embeddings, Semantic Search, and RAG

  Use vector representations to retrieve relevant source material and ground language-model answers in your documents. The big …

• Design System Operations

  Run a component library as a reliable product with headless primitives, theming, documentation, visual checks and a safe …

• Atomic Design & Component Libraries

  … design tokens, interaction rules, accessibility requirements, documentation, and ownership. The five levels Level Responsibility Example Should it know …

• REST API Design

  … a field, changing a type) do. Rule 7: Document it with OpenAPI An OpenAPI (Swagger) spec describes every …

• Multi-Region and Disaster Recovery

  … backup is unproven until restored Keep encrypted backups, document who can trigger failover, practice restoration, and verify the …

• What to Learn in AI, and in What Order

  … staged deliverables and a runnable local document-search project. Make small projects that answer a real question: classify …

• Production Capstone and Interview Practice

  … bucket arn" { value = aws s3 bucket.assets.arn } Document public-access protection, encryption, versioning, and deletion behavior. A …

• Choosing a Programming Language

  … the compiler finds every caller Relies on tests Speed of writing a script Slightly slower Fastest Documentation Types …

• What Is Software Architecture?

  … It's a short document, one per decision, kept in the repo. markdown ADR-007: Use PostgreSQL for …

• Normalization & Denormalization

  … a materialized sales summary, a search document, a product card projection, or an order total. For each one …

• Neural Networks and Deep Learning

  … Embeddings are used for words, images, users, products, and documents. Different architecture families suit different data and tasks …

• Reusable Modules and Clear Interfaces

  … a validation rejecting an empty module name and document the module's inputs and outputs. Decide which settings …

• Releases, Observability and Production Safety

  … Use a flag to disable new behavior and document rollback constraints. Rotate secrets and validate configuration without exposing …

• Providers and Your First AWS Resources

  … Further reading: [AWS provider documentation](https://registry.terraform.io/providers/hashicorp/aws/latest/docs), [AWS authentication](https://registry …

• Database Internals, Replication and Scaling

  … relational, document, key-value, wide-column, graph, time-series, search and vector stores solve different queries. Diagnose before …

• API Contracts, Gateways and Security

  … Use TLS, rate limits, audit logs and secrets management. A safe API contract For POST /orders , document request …

• State, Remote Backends, and Locking

  … Current HashiCorp documentation marks DynamoDB-based locking as deprecated; use native S3 locking for these new examples. See …

• Scalable Frontend Architecture

  … client button is only a UX choice. 5. Document decisions that impose lasting constraints, such as microfrontends or …

• Domain-Driven Design: Strategic Design

  … in conversations, documents, tests and the code itself . mermaid flowchart LR subgraph Without["❌ Translation everywhere"] E1["Expert: 'The …

• Storage, Search and Location Queries

  … An indexer updates the search document. A user query tokenizes text, applies filters such as open-now/delivery …

• Payment Retries: Prevent Duplicate Charges

  … Keep provider keys and attempt history for the documented retry window. Walk through a failure and recovery A …

• Meaningful Names

  Names are the cheapest documentation you have. Learn simple rules for naming variables, functions and classes so code …

• Small Functions That Do One Thing

  … com", true, false, 3); // ✅ Named options are self-documenting createUser({ name: "Ana", email: "ana@mail.com", isAdmin: true …

• How Browsers Render a Page

  … HTML → DOM The browser reads HTML top to bottom and builds the Document Object Model , a tree of …

• Brokers, Replication & Durability

  … drawn step by step. The big idea Important documents are kept in several safes in different buildings . One …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … every document is stored in order and kept. Anyone can come and read from any point, as many …

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … isolation Imagine production, staging, and shared-services VPCs. Document which pairs should communicate before creating attachments. Separate route …

• Finding Service Boundaries with DDD

  … messy or legacy model Published language A shared, documented format (for example, event schemas) Shared kernel A small …

• Event-Driven Architecture

  … event contents Treat event schemas as public APIs; document them (AsyncAPI) (The Kafka and Microservices topics cover delivery …

• Resilience, Disaster Recovery and Multi-Region Design

  … environment and time it against your RTO. 4. Document runbooks and keep them close to the on-call …

• DynamoDB Modeling, RDS Scaling and Data Resilience

  … Check [RDS Proxy endpoints](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/rds-proxy-endpoints.html). Deliverable: document …

• Practical Project: Deploy a Real CRM App on EKS

  … create-role --role-name MyAppCrmCorePodRole \ --assume-role-policy-document file://pod-trust.json aws iam put-role-policy …

• CloudFront: Faster Websites and Safer File Delivery

  … Use the full generated policy or place this statement into a valid policy document. Merge it deliberately with …

• Cost Optimization and the Well-Architected Framework

  … controlled release, then compare cost, latency, and errors. Document the tradeoff instead of claiming success from a lower …

• Code Profiling

  … Reproduce it with a documented workload and record a baseline. 3. Use the right signal: trace for I …