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Lessons (40)

• Finding Service Boundaries with DDD

  … Learn bounded contexts, ubiquitous language, aggregates and context maps from Domain-Driven Design. The big idea The word …

• Domain-Driven Design: Strategic Design

  … One team should own each context. 4. Context mapping: how contexts relate A context map shows the bounded …

• Go Concurrency: Goroutines, Channels and Context

  … limit how much runs at once go func process(ctx context.Context, jobs []Job, workers int) []Result { jobCh …

• Go Web Services with Gin

  … services take context.Context and return domain errors, mapped to HTTP in one place. - Configure server timeouts and …

• Transformers and Large Language Models

  Learn tokens, next-token prediction, attention, pretraining, fine-tuning, context windows, and the limits of language models. The …

• Prompting and Structured Outputs

  Write clear instructions, provide context and examples, constrain responses, and validate model output in code. The big idea …

• C4 Architecture Diagrams: Context, Container, Component and Code

  … Think of a shopping mall: - The context diagram shows the mall, shoppers, bank, delivery company and nearby roads …

• Putting AI Systems into Production

  … input validation, retrieval or context, provider calls, output checks, user experience, monitoring, and operational controls. The model is …

• Embeddings, Semantic Search, and RAG

  … Chunking too small loses context; too large can bury the relevant sentence and consume the context budget. Overlap …

• What Is Software Architecture?

  … a modular monolith , split along DDD bounded contexts , where each module uses Hexagonal/Clean architecture inside, and modules …

• Go Fundamentals

  … If a type has the methods, it is that interface. go type Notifier interface { Notify(ctx context.Context …

• Observability and Incident Response

  … one propagated context through HTTP, queues and background jobs. - Logs: structured, searchable events with no secrets or unnecessary …

• Kubernetes Cluster Architecture, Simply

  … kubectl config current-context Which cluster/context will commands use? Always check the current context before changing anything …

• Product-Scale Frontend Patterns

  … and helpful empty states from tenant and role context. It must not be the final authorization check. tsx …

• Real-Time, Pub/Sub, Webhooks and CDC

  … Include event ID, schema version, ordering key and trace context; consumers deduplicate and send exhausted failures to a …

• State Management (Redux, Zustand, TanStack Query)

  … Theme, logged-in user, shopping cart, sidebar open Context, Zustand , Redux Toolkit Server state Products, orders, user profiles …

• Secrets, Ephemeral Values, and Least Privilege

  … persisted Terraform state/plan Only permitted in compatible contexts Write-only resource arguments Provider input omitted from persisted …

• Domain-Driven Design: Tactical Patterns

  … Date; }; They let aggregates stay small and decoupled (rule 4), feed other bounded contexts (through an outbox and …

• Choosing an Architecture

  … For example: a modular monolith (1), with Hexagonal modules (2), cut along DDD bounded contexts (3), talking via …

• React Hooks in Practice

  … Context makes a value available to a whole subtree. jsx const ThemeContext = createContext("light"); function App() { const [theme …

• Python Fundamentals

  … print("Always runs") A context manager ( with ) guarantees cleanup even when an error happens: python from pathlib import …

• Backend Languages: Node.js, Go, Python & Rust

  … users/:id", func(c gin.Context) { user, err := findUser(c.Request.Context(), c.Param("id")) if err != nil …

• Behavioral Patterns I: Observer, Strategy, Command, State

  … add a new strategy, don't edit the context. --- 3. Command 🧾 Analogy: A waiter writes your order …

• Observability: Logs, Metrics & Traces

  … hard to search, no context console.log("Payment failed for user 42"); // ✅ Structured (pino): every field is searchable …

• Frontend Performance & Core Web Vitals

  … render only the ~20 visible rows (TanStack Virtual, react-window) Context updates re-render everything Split contexts, or …

• Architecture Patterns at Scale

  … failure boundaries and operational cost. The problem in context A twelve-person team runs a growing marketplace. Deployments …

• CloudWatch: Know What Your App Is Doing

  … These signals complement each other. Write a useful structured log Instead of Something broke , emit safe context: json …

• Batch vs Stream and Data Modeling

  … deliberately denormalize proven read bottlenecks. The problem in context A marketplace needs yesterday’s financial report and a …

• Design a Reliable Notification System

  … provider failover and auditable states. The problem in context A marketplace sends password resets, order receipts and promotional …

• Big Data: ETL, Warehouses and Streaming

  … layers, and explicit freshness contracts. The problem in context A retailer receives 50 million purchase and browsing events …

• Design a Polite Web Crawler

  … normalize, deduplicate and schedule per host. The problem in context A search product wants to crawl 100 million …

• Releases, Observability and Production Safety

  … and observable service-level outcomes. The problem in context A new checkout release changes an order column and …

• React Internals & Concurrent Rendering

  … own state changes, its parent renders, a consumed context changes, or its identity/key changes. A render is …

• Time, Consistency and Distributed Transactions

  … without promising impossible global certainty. The problem in context Two regions edit an account and process an order …

• Design a Logging and Monitoring Platform

  … alerting useful rather than noisy. The problem in context A fleet of 5,000 services emits 200,000 …

• Data Structures for Scale

  … while understanding their error bounds. The problem in context A location service must find nearby drivers, count distinct …

• Distributed Coordination: Consensus, Heartbeats and Gossip

  … propagation for the right problems. The problem in context Three scheduler nodes coordinate work. A network pause makes …

• System Design Interview Framework

  … trade-off-aware architecture discussion. The problem in context An interviewer asks “Design a messaging app.” There is …

• Design a File Storage Service

  … metadata, authorization, sharing and synchronization. The problem in context A team uploads 2 GB video files from unreliable …

• Proxies, APIs and Real-Time Protocols

  … based on the interaction shape. The problem in context A delivery app needs order creation, live driver positions …