AWS Lambda
Run code without provisioning or managing servers
About AWS Lambda
AWS Lambda is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources. You pay only for the compute time you consume, with no charge when your code isn't running, making it ideal for event-driven applications, APIs, and data processing workloads.
Pros & Cons
Pros
- True pay-per-use with no idle costs
- Automatic scaling from zero to thousands of concurrent executions
- Deep integration with the broader AWS ecosystem
- Generous always-free tier suitable for many small projects
- Strong support for multiple languages and container deployments
- Mature tooling, documentation, and community
Cons
- Cold starts can add latency, especially for VPC-bound functions
- 15-minute maximum execution time limits long-running tasks
- Vendor lock-in to AWS services and APIs
- Local development and debugging more complex than traditional servers
- Costs can be unpredictable at very high scale compared to provisioned compute
Key Features
Event-Driven Execution
Trigger functions from over 200 AWS services and SaaS applications, including S3, DynamoDB, API Gateway, and EventBridge.
Multiple Language Support
Native runtimes for Node.js, Python, Java, Go, Ruby, .NET, and custom runtimes via Lambda Layers.
Automatic Scaling
Scales from a few requests per day to thousands per second automatically, with no capacity planning required.
Pay-Per-Use Pricing
Charged only for requests and compute time used, billed in 1ms increments with a generous free tier.
Lambda Layers
Share code, libraries, and dependencies across multiple functions to reduce deployment package size and complexity.
Container Image Support
Package and deploy functions as container images up to 10 GB in size for larger workloads and familiar tooling.
Provisioned Concurrency
Pre-warm functions to eliminate cold starts for latency-sensitive applications.
Lambda@Edge
Run code at AWS edge locations via CloudFront for low-latency global content delivery customization.
VPC Integration
Securely access resources inside an Amazon VPC, including RDS databases and ElastiCache clusters.
Built-in Monitoring
Integrated with CloudWatch for logs, metrics, and X-Ray for distributed tracing out of the box.
Pricing
- 1 million free requests per month
- 400,000 GB-seconds of compute time
- Always free (no expiration)
- All AWS Lambda features included
- $0.0000166667 per GB-second
- Billing in 1ms increments
- No upfront commitment
- Scales automatically
- $0.0000133334 per GB-second
- Up to 34% better price-performance
- Same Lambda features
- Faster execution for many workloads
- Pre-initialized execution environments
- Eliminates cold starts
- Predictable low latency
- Charged for time provisioned
Best For
Serverless APIs
Build REST and GraphQL APIs combined with API Gateway without managing any backend servers.
Event-Driven Data Processing
Process files uploaded to S3, transform DynamoDB streams, or react to Kinesis events in real time.
Scheduled Tasks & Cron Jobs
Run periodic jobs via EventBridge schedules without maintaining always-on infrastructure.
Backend for Mobile and Web Apps
Power authentication, business logic, and data access for client applications cost-effectively.
Real-Time Stream Processing
Analyze and react to streaming data from IoT devices, logs, or clickstreams as it arrives.
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