Build AWS Infrastructure
The Right Way

The wrong answer most candidates give vs the right answer senior engineers give. 10 real scenarios with exact debugging commands, mental models, and the one-liners that impress interviewers. Site down at 3 AM, AWS key leaked, database at 95% CPU, and more.

Real cost breakdowns across compute, storage, databases, Kubernetes, serverless, and data transfer. Which cloud is actually cheapest for your workload — with dollar amounts, not marketing.

Real salary data for 6 Indian cities, 4 experience levels, service vs product vs FAANG, DevOps vs SRE vs Platform Engineer, remote US/EU salaries, skill premiums, certification impact, and negotiation strategies. Not Glassdoor averages — real numbers.

The three roles that used to be one job. What each actually does day-to-day, real salary data for India and remote, which certifications matter, a decision framework for choosing your path, and how to transition between roles. With comparison tables and career flow diagrams.

Every photo on Facebook still exists. TAO (2 billion reads/sec social graph cache), Haystack and f4 (warm and cold photo storage), Cassandra for messaging, the CDN layer, Open Compute Project custom hardware, and the economics of exabyte-scale storage.

Meta pushes code thousands of times per day — 4 billion users, zero maintenance windows. Tupperware container orchestration, canary deployments, Gatekeeper feature flags, graceful degradation tiers, and the cultural shift from 'move fast and break things' to 'move fast with stable infra'.

How does WhatsApp deliver 100 billion messages daily to 2 billion users with under 200ms latency? Erlang/BEAM, Signal Protocol E2E encryption, the message delivery pipeline, multi-device sync, group messaging fan-out, and why 50 engineers handled 2 billion users for years.

The honest multi-cloud playbook. Seven real reasons companies run AWS + Azure + GCP (most have nothing to do with technology), five reasons most companies shouldn't, real architecture patterns with diagrams, hidden cost traps, and a decision framework for whether multi-cloud is actually right for you. No vendor marketing, just production reality.

Most DevOps content assumes you already have the job. This one does not. The real, no-fluff playbook for landing your first DevOps role with zero production experience — what to learn, the 5 projects that actually get you noticed, which certifications matter, how to write a resume without experience, and exactly how to answer "you have no experience" in the interview.

Scaling is not one problem — it is a sequence of five very specific problems, each with a predictable fix. A stage-by-stage walkthrough of what actually breaks at 1K, 10K, 100K, 500K, and 1M users, the exact AWS architecture change that unblocks each stage, and the over-engineering traps that waste a year of engineering time.

NAT Gateway is the silent bill killer on small AWS accounts. The full playbook: how the $0.045/GB data processing charge actually works, how to audit your traffic with VPC Flow Logs and Athena, and the free S3 Gateway Endpoint plus Interface Endpoint patterns that cut NAT Gateway costs by 80% in an afternoon.

Three-layer entitlement checks, Widevine on Android, the 5-device / 10,000-song cap, the 30-day heartbeat clock, and why Spotify's audio DRM is deliberately weaker than Netflix's video DRM. A direct companion to the Netflix DRM series.

Content-addressable block storage, rolling hash chunking, Magic Pocket's exabyte-scale erasure-coded backend, LAN Sync peer-to-peer, and the Rust-rewritten Nucleus sync engine. How a 4GB video edit uploads as 200KB.

Operational Transform explained with real examples. The Jupiter model, server-authoritative rebasing, optimistic client updates, and why Google chose OT over CRDTs. The algorithm that lets 100 people type in one document without losing anyone's changes.

The three-layer architecture behind Stripe Radar: feature store, model serving inline with authorization, and decision layer. Real-time ML under a sub-100ms latency budget, with shadow deployments and network-effect data.

H3 hexagonal geo-indexing, geo-sharded supply/demand state, streaming aggregation pipelines, hot cell rebalancing, and the dispatch feedback loop. The distributed systems problem hidden behind the surge multiplier.

When you tap the Download button, you are not downloading an MP4. The full step-by-step: offline manifest, persistent license issuance, CDM secure storage, app-private sandbox, the 30-day and 48-hour expiration clocks, and why rooting cannot extract the video.

A full end-to-end walk-through of how streaming services run DRM at planet scale. Common Encryption, Widevine L1/L2/L3, license server architecture, concurrent stream enforcement, HDCP, Open Connect, and the distributed systems tricks that make it all work.

The patterns that separate junior playbooks from ones you can run against 500 servers safely. Idempotency, handlers, roles, check mode, tags, serial rollouts, and the production checklist I work through every time.

A production walk-through of Kubernetes RBAC with real YAML. Role vs ClusterRole, RoleBinding vs ClusterRoleBinding, service accounts, EKS IAM integration, and the rules I follow to keep clusters locked down.

Terraform provisions the infrastructure. Ansible configures the software inside it. Here is how they work together in production, with a real EC2 + NGINX example showing where the line is between the two tools.

Build a complete CI/CD pipeline with GitHub Actions that builds Docker images, pushes to ECR, and deploys to ECS Fargate. Uses OIDC — no access keys needed.

Deploy Nginx as a reverse proxy on AWS EC2 with free SSL from Let's Encrypt. Complete Terraform setup with security hardening and production config.

Decision framework for choosing between RIs and Savings Plans. Real cost comparisons, flexibility tradeoffs, and common mistakes that waste money.

Deploy a production EKS cluster on AWS using Terraform. Managed node groups, IRSA, OIDC provider, Ingress, and networking best practices.

gp3 is 20% cheaper with better baseline performance. Migrate with zero downtime using Console, CLI bulk script, or Terraform. Includes RDS migration too.

Most EC2 instances are 2-4x larger than needed. This guide walks through collecting metrics, identifying candidates, and safely resizing — with a real case study saving 78%.

Deploy a complete monitoring stack on AWS. Prometheus for metrics, Grafana for dashboards, Node Exporter for system data, and alerting — all with Terraform and Docker Compose.

A real production case study: how I diagnosed slow PHP-FPM workers, found missing MySQL indexes causing full table scans, tuned pool settings with a calculated formula, offloaded sessions to Redis (97% cache hit rate), and moved static assets to CloudFront — cutting AWS costs by ~80% and reducing EC2 instances from 6 to 2.

S3 for objects, EBS for block storage, EFS for shared files — but knowing which to pick for each use case saves you money and headaches. This guide covers pricing, performance, real use cases, and a decision flowchart to help you choose the right storage every time.

From "what is Docker" to multi-stage production builds. This guide covers images, containers, Dockerfiles, layer caching, Docker Compose for multi-service apps, .dockerignore, and pushing to ECR. Everything you need to go from zero to deploying containers.

You run terraform plan and get "Error acquiring the state lock." Do not panic. Do not immediately force-unlock. This guide explains why it happens, how to safely fix it, and how to prevent it from happening again — without corrupting your state file.

Most AWS accounts have the same problems — root with no MFA, developers with AdministratorAccess, access keys that have not been rotated in years. This guide covers practical IAM patterns that work in production: scoped policies, tag-based access control, MFA enforcement for destructive actions, and using Access Analyzer to find unused permissions.

An honest comparison from someone who has used both. Terraform wins on ecosystem, multi-cloud, syntax, and modules. CloudFormation wins on automatic rollback and zero state management. This guide covers the real trade-offs with side-by-side code examples so you can pick the right tool for your team.

By default Terraform stores state locally. The moment a second person joins your project, local state becomes a problem — no locking, no versioning, no collaboration. This guide sets up S3 for encrypted state storage and DynamoDB for locking so two people never corrupt the state by running apply at the same time.

Spinning up an RDS instance through the AWS console takes five minutes. Setting it up properly for production takes a lot more thought. This guide covers what actually matters — placing your database in private subnets where it cannot be reached from the internet, enabling encryption at rest and in transit, configuring automated backups with the right retention, switching to gp3 storage to save money, and turning on Performance Insights so you can spot slow queries before your users do.

Storing AWS access keys in GitHub secrets is a security risk that most teams accept because they do not know a better way. There is one — OIDC lets GitHub Actions assume an IAM role directly without any long-lived credentials. This guide sets up the full pipeline: ECR repository with image scanning, OIDC trust between GitHub and AWS, and deployment workflows you can copy straight into your repo for ECS or EKS.

You have dockerized your app and now you need somewhere to run it. ECS Fargate lets you run containers without managing any servers — no EC2 instances to patch, no cluster capacity to worry about. This guide takes you through the full setup: task definitions, services, load balancer integration, auto-scaling based on CPU and memory, and pulling secrets from AWS Secrets Manager so nothing sensitive ends up in your code.

You have built a React app, a portfolio, or a landing page and you want to put it on your own domain with proper SSL. This guide covers the full setup — S3 bucket for storage, CloudFront as your CDN for fast global delivery, Route 53 for DNS, ACM for a free SSL certificate, and proper routing so your single-page app does not break when someone refreshes on a deep link.

Your dev and staging EC2 instances and RDS databases are running 24/7 but your team only works 8 hours a day. That means you are paying for 16 hours of idle time every single day. This guide shows you how to automatically stop everything at night and start it back up in the morning using Lambda and EventBridge — saving up to 65% on non-production AWS costs without anyone lifting a finger.

Most tutorials show you a single subnet and call it done. That falls apart the moment you need a database that should not be reachable from the internet. This guide walks you through building a proper three-tier VPC — public subnets for load balancers, private subnets for your application, and isolated database subnets — spread across multiple availability zones so one AZ going down does not take your entire stack with it.

Your dev and staging EC2 instances and RDS databases are running 24/7 but your team only works 8 hours a day. That means you are paying for 16 hours of idle time every single day. This guide shows you how to automatically stop everything at night and start it back up in the morning using Lambda and EventBridge — saving up to 65% on non-production AWS costs without anyone lifting a finger.

You have built a React app, a portfolio, or a landing page and you want to put it on your own domain with proper SSL. This guide covers the full setup — S3 bucket for storage, CloudFront as your CDN for fast global delivery, Route 53 for DNS, ACM for a free SSL certificate, and proper routing so your single-page app does not break when someone refreshes on a deep link.

You have dockerized your app and now you need somewhere to run it. ECS Fargate lets you run containers without managing any servers — no EC2 instances to patch, no cluster capacity to worry about. This guide takes you through the full setup: task definitions, services, load balancer integration, auto-scaling based on CPU and memory, and pulling secrets from AWS Secrets Manager so nothing sensitive ends up in your code.

Storing AWS access keys in GitHub secrets is a security risk that most teams accept because they do not know a better way. There is one — OIDC lets GitHub Actions assume an IAM role directly without any long-lived credentials. This guide sets up the full pipeline: ECR repository with image scanning, OIDC trust between GitHub and AWS, and deployment workflows you can copy straight into your repo for ECS or EKS.

Spinning up an RDS instance through the AWS console takes five minutes. Setting it up properly for production takes a lot more thought. This guide covers what actually matters — placing your database in private subnets where it cannot be reached from the internet, enabling encryption at rest and in transit, configuring automated backups with the right retention, switching to gp3 storage to save money, and turning on Performance Insights so you can spot slow queries before your users do.

By default Terraform stores state locally. The moment a second person joins your project, local state becomes a problem — no locking, no versioning, no collaboration. This guide sets up S3 for encrypted state storage and DynamoDB for locking so two people never corrupt the state by running apply at the same time.

An honest comparison from someone who has used both. Terraform wins on ecosystem, multi-cloud, syntax, and modules. CloudFormation wins on automatic rollback and zero state management. This guide covers the real trade-offs with side-by-side code examples so you can pick the right tool for your team.

Most AWS accounts have the same problems — root with no MFA, developers with AdministratorAccess, access keys that have not been rotated in years. This guide covers practical IAM patterns that work in production: scoped policies, tag-based access control, MFA enforcement for destructive actions, and using Access Analyzer to find unused permissions.