Learn AWS-LAMBDA with Real Code Examples

Lambda executes code in response to events such as HTTP requests, S3 uploads, DynamoDB updates, or custom triggers.

Supports multiple programming languages including Node.js, Python, Java, Go, Ruby, .NET, and custom runtimes via Lambda Layers.

Automatically scales functions in response to traffic, handling concurrency without server management.

Integrates with AWS services like API Gateway, S3, DynamoDB, CloudWatch, EventBridge, and Step Functions.

Ideal for building APIs, ETL pipelines, microservices, and event-driven workflows.

Function-as-a-Service (FaaS) model

Triggers from AWS services (S3, DynamoDB, SNS, API Gateway, EventBridge)

Lambda Layers for code reuse

Environment variables and secrets via AWS Secrets Manager

Integration with CloudWatch for logging and monitoring

Function - the deployed serverless code

Trigger - AWS event that invokes function

Layer - reusable code and dependencies

Environment Variables - runtime configuration

Execution Role - IAM permissions for function access

src/ - source code

template.yaml - SAM configuration

package.json / requirements.txt - dependencies

tests/ - unit and integration tests

deployment scripts - optional CI/CD pipelines

Write code in supported language

Define function configuration and triggers

Package dependencies (if needed) and deploy

Test function locally using SAM or Serverless Framework

Monitor logs and metrics via CloudWatch

Beginner: single API Gateway endpoint

Intermediate: event-driven S3 or DynamoDB processor

Advanced: microservices with multiple functions and triggers

Expert: serverless orchestration with Step Functions

Auditor: optimize concurrency, cold-starts, and cost

AWS Lambda vs Cloudflare Workers: Lambda is region-based serverless, Workers run at edge globally

Lambda vs Fission: Lambda is fully managed on AWS, Fission runs serverless on Kubernetes

Lambda vs Fastly Compute@Edge: Lambda is AWS-region serverless, Fastly executes at edge

Lambda vs Micronaut: Lambda is serverless FaaS, Micronaut is full-stack framework

Lambda vs Node.js server: Node.js requires servers, Lambda auto-scales serverless

2014 – AWS Lambda initial launch

2015 – Added API Gateway integration

2016 – Introduced Layers for code sharing

2017–2019 – Expanded language runtimes

2020–2025 – Improved concurrency, orchestration, and monitoring features

Function - unit of serverless code

Trigger - AWS event invoking function

Layer - reusable dependencies

Environment Variables - runtime configuration

Execution Role - IAM role granting permissions