Day 2 - Startup Serverless-First Architecture — Cost-Zero Scaling, No Ops Overhead, Function Composition Limits

[WEEK 15 DAY 2 COMPREHENSIVE SCENARIO: SERVERLESS STARTUP FROM $0 TO 100X]

Extreme opposite of Day 1 enterprise: 3-person startup, $0 cloud budget, viral growth risk, zero ops team. Pro design here means pure serverless-first—Lambda, DynamoDB, API Gateway, S3—every choice optimized to avoid provisioning.

Core principles:

• Consumption model: Pay only for invocations/GB-months, autoscale to infinity
• No cold start killers: Provisioned concurrency, reserved capacity where needed
• Function composition: Lambda→SQS→Lambda pipelines, not monoliths
• DynamoDB on-demand: Autoscale throughput, pay-per-request