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Lessons (25)

• Design a File Storage Service

  Upload bytes directly to object storage while the API owns durable metadata, authorization, sharing and synchronization. The problem …

• S3: Store Files Safely

  Use S3 for uploads, images, backups, and static files without making buckets public by accident. What S3 is …

• Practical Lab: S3 File Upload and CloudFront Delivery with NestJS

  … StorageService) {} @Post('upload') @UseInterceptors(FileInterceptor('file')) upload( @UploadedFile( new ParseFilePipe({ validators: [ new MaxFileSizeValidator({ maxSize: 5 1024 1024 }), // 5 …

• Storage, Search and Location Queries

  … ask to upload profile-photo.jpg API - Client: short-lived, scoped presigned upload URL Client - Object storage: upload …

• 500 Users Upload Documents at Once: Design the Background Job Pipeline

  … accept, store and record python @app.post("/documents", status code=202) async def upload(file: UploadFile, user: User …

• IAM: Who Can Do What

  … For the book shop, a developer may read logs, the order API may upload receipts, and the email …

• Configuration, Secrets and Storage

  … This is good for temporary files and bad for databases or user uploads. For data that must remain …

• Serverless Architecture

  … order.id }) }; }; ts // Triggered by an S3 upload: create a thumbnail export const handler = async (event: S3Event) = { for …

• Timeouts, Retries & Backpressure

  … Admit up to a safe rate, show new uploads as “processing,” and return a clear retry-later response …

• Safe AWS Deployments with IaC and CI/CD

  … Value: !Ref UploadsBucket CloudFormation generates a bucket name, avoiding a hard-coded naming collision. This template creates a …

• EC2, Storage and Auto Scaling

  … Keep user uploads in S3 and shared session data in an appropriate external store. Otherwise a user's …

• IAM Deep Dive: Policy Evaluation, STS and Cross-Account Access

  … s3: ", "Resource": ["arn:aws:s3:::shop-uploads", "arn:aws:s3:::shop-uploads/ "], "Condition": { "Bool": { "aws:SecureTransport": "true" }, "IpAddress …

• Testing, Preconditions, and Policy Checks

  … Do not upload raw plan JSON to an untrusted service. Exercise: add a second test assertion for a …

• Providers and Your First AWS Resources

  … If you uploaded objects, remove all object versions and delete markers before deleting a versioned bucket. This example …

• AWS: Start Here

  … customers RDS PostgreSQL Store structured data with transactions Uploaded covers Private S3 bucket Store file bytes separately from …

• AWS Interview Questions: Clear Answers

  … restoration. When would you choose S3? For files: uploads, images, backups, reports, and static assets. I would not …

• Meaningful Names

  … L["Module / global scope"] -- very descriptive l1["MAX UPLOAD SIZE MB"] The wider a name travels, the more …

• Production Capstone and Interview Practice

  … Destroy only dev application resources when finished, after confirming the plan and clearing any object versions you uploaded …

• CloudFront: Faster Websites and Safer File Delivery

  … h1 <p Delivered through CloudFront.</p </body </html Upload it to the bucket root. Then configure CloudFront: 1 …

• Cost Optimization and the Well-Architected Framework

  … when access patterns are unknown. - Abort incomplete multipart uploads; expire old versions. json { "Rules": [{ "ID": "tier-and-expire …

• AWS Data Pipelines in Plain Language

  … cents, or 43.00 in the example currency. Upload the file to a dedicated S3 prefix such as …

• Serverless: Lambda and API Gateway

  … safely. What serverless means here With Lambda, you upload a function. AWS runs it when an event arrives …

• Node.js and Express

  … with a request ID on every line File uploads multer with size and type limits, store in object …

• Go Concurrency: Goroutines, Channels and Context

  … are running) go func() { defer func() { <-sem }() // release upload(f) }() } For "run these, stop on the first error …

• Scaling, Load Balancing & Rate Limiting

  … R[(Redis sessions)] A2 & B2 -- S3[(S3 file uploads)] end Rule: any server should be able to handle …