System Design & Serverless Architecture

Event-driven design • AWS Serverless • High availability • Cost optimization

Summary

Goal: Build scalable, fault-tolerant cloud systems with minimal ops overhead and pay-per-use efficiency.
Approach: AWS Serverless stack — API Gateway, Lambda, DynamoDB, SQS/SNS, CloudWatch, and S3.
Outcome: Reduced infrastructure cost by ~60% and improved reliability with automatic scaling and zero-downtime deployments.

Architecture Overview

Architecture includes API Gateway entrypoints, Lambda compute, S3 for file storage, DynamoDB for data persistence, and SQS for asynchronous workflows.

Key Components

API Gateway + Lambda: Modular endpoints deployed as independent Lambdas for microservice isolation.
Event-driven pipelines: S3 triggers → Lambda → SQS → Worker Lambda for background processing.
Data Layer: DynamoDB for OLTP workloads; optional Redshift for analytics integration.
Observability: CloudWatch metrics, structured logging, and centralized tracing via X-Ray.
Cost Optimization: Spot compute for batch jobs, reserved concurrency for predictable cost ceilings.

Deployment Workflow

IaC via AWS CDK / Serverless Framework.
Continuous deployment through GitHub Actions →sam deploy to AWS.
Versioned Lambdas with staged rollouts (dev → staging → prod).

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