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Lessons (40)

• State Management (Redux, Zustand, TanStack Query)

  Where should data live in a frontend app? Learn the four kinds of state, when local state is …

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

  … In Strategy the client picks the algorithm. In State the object switches itself as its state changes. --- Cheat …

• Stacks & Queues

  … Avoid shift() on large arrays; use a proper queue. - Stacks: undo, call stack, bracket matching, DFS, monotonic-stack …

• State, Remote Backends, and Locking

  Share state through S3, enable native locking, migrate safely, and protect recovery data. Why state exists A resource …

• Views, Triggers & Stored Procedures

  Interview answers for views, materialized views, triggers and stored procedures. Covers PDF questions 20, 24 and 27-30 …

• StatefulSets, DaemonSets, Jobs and CronJobs

  … Stable identity and storage: StatefulSet. - Node agents: DaemonSet. - Jobs need restartPolicy of Never or OnFailure , plus backoffLimit and …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … validate(event) perform operation with stable idempotency key(event.operationId) persist confirmed result or recoverable pending state() This …

• Rust: Ownership, Borrowing and Lifetimes

  … Covers Cargo, move vs copy vs clone, &T vs &mut T, String vs &str, slices and reading borrow …

• Production Capstone and Interview Practice

  Combine modules, isolated environments, remote state, tests, and reviewed delivery in a production-style storage project. Build a …

• TypeScript in Practice

  … T } { status: "error"; error: string }; function render(state: RemoteData<User[] ): string { switch (state.status) { case "idle": return "Press …

• TypeScript Essentials

  … model states safely ts type RequestState<T = { status: "loading" } { status: "error"; error: string } { status: "success"; data: T }; function …

• Batch vs Stream and Data Modeling

  … Run streaming fraud checks with stable event IDs and event-time windows; define how late arrivals update a …

• Design a File Storage Service

  Upload bytes directly to object storage while the API owns durable metadata, authorization, sharing and synchronization. The problem …

• Advanced TypeScript for Frontend

  Model real UI states safely with generics, discriminated unions, conditional types and runtime schema validation at API boundaries …

• Dynamic Programming

  … tabulation"] direction TB b1["Start from the smallest case"] -- b2["Fill a table step by step"] -- b3["Last …

• EC2, Storage and Auto Scaling

  … A running EC2 status alone does not prove Apache started successfully. If it fails, inspect instance status checks …

• Rust: Types, Errors and Concurrency

  … Vec::new(), status: Status::Pending } } fn describe(&self) - String { match &self.status { Status::Pending = "waiting for payment".into …

• Configuration, Secrets and Storage

  … Opaque stringData: DATABASE URL: "replace-with-real-value" yaml envFrom: - secretRef: name: shop-api-secrets Base64 encoding is …

• Storage, Search and Location Queries

  … Store photo bytes in object storage and keep ownership plus publication state in transactional metadata. 2. Build text …

• Go Fundamentals

  … small language, fast compiler, one static binary](/img/languages/go-overview.svg) Setup and structure bash go mod …

• Arrays & Strings

  The most-used data structure. See how arrays live in memory, why some operations are instant and others …

• Terraform: Start Here

  … 2. Intermediate, lessons 6–10: dependencies, stable resource identities, modules, shared state, and environments. 3. Advanced, lessons 11 …

• Go Web Services with Gin

  … c.JSON(http.StatusNotFound, gin.H{"error": "not found"}) case errors.Is(err, ErrInvalidTitle): c.JSON(http.StatusUnprocessableEntity …

• Prompting and Structured Outputs

  … A strong prompt makes the task, context, boundaries, and expected output explicit. It can improve consistency, but it …

• Domain-Driven Design: Strategic Design

  … string; STAT CD: "A" "I" "B" }; // …our Billing context wants this. type BillingCustomer = { id: string; fullName: string; canBeInvoiced …

• Node.js and Express

  What Node.js is and how it serves thousands of connections on one thread, then Express step by …

• Flash Sale: 10 Million Buyers, No Oversell

  A queue smooths traffic but does not reserve stock. The durable inventory owner decides the winner atomically. The …

• Extending Kubernetes: CRDs, Operators and Admission

  … a controller watches the desired state , compares it with the actual state , and acts to close the gap …

• Serverless Architecture

  … a cold start . mermaid gantt title Cold vs warm invocation dateFormat x axisFormat %L section Cold start start …

• Drift, Troubleshooting, and Disaster Recovery

  Diagnose common failures, recover after partial applies, and operate state without destructive guesswork. Start with the failing layer …

• 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 …

• Storage Engines & Database Operations

  … a bounded pool protects the primary while WAL, backups and replicas provide recoverability](/img/database/storage-operations.svg …

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

  … For Acme Shop, this is enough: mermaid flowchart LR Customer["👤 Customer"] Staff["👩‍💼 Store staff"] Shop["🛒 Acme Shop …

• AWS: Start Here

  … running time, storage, data transfer, and requests. Add a budget alert before experimenting. Stop or delete test resources …

• CQRS & Event Sourcing

  Separate the model you write with from the model you read with, and store every change as an …

• Clean Architecture in Depth

  … OrderLine[], private status: "PENDING" "PAID" "CANCELLED", ) {} static create(id: string, customerId: string, lines: OrderLine[]): Order { if (lines.length …

• DynamoDB Modeling, RDS Scaling and Data Resilience

  … The standby does not serve reads in the classic single-standby setup. - Aurora stores data in six copies …

• Kubernetes: Start Here

  … 1. Desired state — what you asked for. Example: “three copies.” 2. Actual state — what is running right now …

• Big Data: ETL, Warehouses and Streaming

  Build reliable analytical pipelines with batch/stream processing, lake and warehouse layers, and explicit freshness contracts. The problem …

• AWS Databases: Choose the Right One

  Choose SQL, key-value, or cache storage by the problem you need to solve, then protect it with …