Serverless Application Infrastructure Requirements

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Application Context & Use Case

Primary use case? (API backend, event processing, data transformation, automation)
Application type? (web API, batch processing, real-time processing, workflow automation)
Event sources? (HTTP requests, S3 events, database changes, scheduled tasks, IoT events)
Business criticality and SLA requirements?
Expected lifespan and evolution of the application?
Integration with existing systems?

Function Architecture & Design

Programming language preference? (Python, Node.js, Java, C#, Go, Ruby)
Function execution patterns? (synchronous, asynchronous, event-driven)
Function size and complexity? (simple transforms vs complex business logic)
Stateful vs stateless requirements?
Cold start sensitivity? (latency requirements, warm-up strategies)
Function composition needs? (step functions, workflow orchestration)

Event Sources & Triggers

API Gateway requirements? (REST, HTTP, WebSocket APIs)
Database triggers needed? (DynamoDB streams, RDS events)
File processing triggers? (S3 events, EFS changes)
Message queue integration? (SQS, SNS, EventBridge)
Scheduled execution needs? (EventBridge rules, cron expressions)
Third-party webhook integration?

Data Processing & Storage

Database requirements? (DynamoDB, RDS, Aurora Serverless, DocumentDB)
Data volume and velocity? (records per second, data size)
Caching needs? (ElastiCache, DAX for DynamoDB)
File storage requirements? (S3, EFS for shared storage)
Data transformation complexity?
Cross-function data sharing needs?

Performance & Scalability

Expected request volume? (per second, per minute, per day)
Latency requirements? (milliseconds, seconds)
Concurrency requirements? (simultaneous executions)
Memory and timeout requirements per function?
Burst capacity needs? (sudden traffic spikes)
Reserved concurrency requirements?

Security & Authentication

Authentication method? (API keys, JWT, Cognito, IAM)
Authorization requirements? (fine-grained permissions, RBAC)
VPC requirements? (private subnets, NAT gateway access)
Secrets management needs? (API keys, database credentials)
Encryption requirements? (at rest, in transit)
Compliance requirements? (GDPR, HIPAA, PCI-DSS)

Development & Deployment

CI/CD pipeline requirements?
Infrastructure as Code preference? (SAM, CDK, Serverless Framework)
Environment management? (dev, staging, prod)
Blue/green or canary deployment needs?
Local development and testing strategy?
Automated testing requirements? (unit, integration, load)

Cost Optimization

Expected execution frequency and duration?
Memory optimization requirements?
Provisioned concurrency needs vs cost trade-offs?
Data transfer cost considerations?
Reserved capacity planning?
Cost allocation and tracking requirements?