Chapter 3: Cloud & Infrastructure

Designing for Scalability, Availability & Resilience

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Objective

To understand the foundational elements of cloud-native architecture, and to learn how to design, deploy, and manage systems that scale efficiently, recover gracefully, and align with modern infrastructure best practices.

Introduction

In the previous chapter, we explored Software Design & Architectural Patterns, how to structure your application logic using layered, clean, and modular principles. But great code alone isn’t enough. To truly architect a solution, we must consider where and how that software runs.

This brings us to a critical pivot in your journey: Cloud & Infrastructure Design.

As a Solution Architect, it’s not just about writing scalable code, it’s about building scalable systems. This chapter will equip you with the tools, principles, and mental models to design reliable cloud architectures that power modern businesses.

The Big Three: AWS, Azure & GCP

Cloud providers have abstracted away the pain of physical infrastructure, but with great power comes great complexity. You’ll choose one cloud platform track (AWS / Azure / GCP) and learn the core services every architect must know:

Core Concepts:

• Compute: EC2 (AWS) / VM (Azure) / Compute Engine (GCP)
• Storage: S3 (AWS) / Blob Storage / GCS
• Networking: VPC, Subnets, NAT Gateway, Route Tables
• Identity & Access Management: IAM roles, policies, and security groups
• Serverless: Lambda (AWS) / Azure Functions / Cloud Functions

Serverless vs Containerized Architecture

Every architecture decision has trade-offs. This section dives into:

• When to go Serverless: event-driven apps, unpredictable loads, fast iteration
• When to use Containers: consistent environments, complex microservices, portability with Kubernetes

We’ll weigh factors like cold starts, cost optimization, latency, and ecosystem support.

Designing for High Availability

A true architect plans for failure. That means:

• Multi-region deployments for global reach & redundancy
• Load Balancers to distribute traffic
• Auto-scaling groups to handle dynamic workloads
• Failover strategies to ensure business continuity

You’ll learn how to build systems that stay resilient even when components break, because in the cloud, something always does.

Tools of the Trade

As architects, we don’t click around UIs, we define infrastructure as code (IaC). You’ll get hands-on experience with:

• AWS CloudFormation: Define and deploy infrastructure in repeatable templates
• Terraform: A cloud-agnostic tool to provision infrastructure across providers
• Monitoring & Logging: Basics of CloudWatch, Azure Monitor, and Stackdriver

Lab: Cloud Deployment Exercise

Goal: Deploy a basic 3-tier web application using IaC. Choose between CloudFormation (AWS) or Terraform and build:

• A VPC with subnets
• EC2 instances for backend
• Load balancer for frontend
• S3 bucket for static content
• IAM roles with least privilege

Assignment: High Availability Design

Sketch out a high-level architecture diagram for a customer-facing application. Include:

• Multi-region setup
• Load balancing and autoscaling
• Backup & failover
• Security layers (IAM, subnets)

Use draw.io, Lucidchart, or a whiteboard, the goal is to think like an architect.

Key Takeaways

• Cloud is your infrastructure playground, but design principles still rule.
• Think in availability zones, latency boundaries, and failure domains.
• Infrastructure is not just deployment, it’s strategy.
• Your code needs a cloud-native home, make it solid, secure, and scalable.

Next Up → Chapter 4: DevOps, CI/CD & Monitoring

Now that your infrastructure is cloud-ready, it’s time to automate deployments, ensure continuous delivery, and monitor systems like a pro.

Course is powered by Techvalens

This program is brought to the developer community by Techvalens, a global technology consulting company with over 17 years of experience in building scalable digital solutions for clients across the US, Europe, and India.

We’re the minds behind Evluate AI, AI-powered hiring platform and we’re committed to empowering the next generation of tech leaders.

Follow us on LinkedIn for expert insights, system design tips, and updates on upcoming programs: linkedin.com/company/techvalens