Practical AWS — Lambda cold starts and when to actually care, S3 patterns that prevent surprise bills, SQS vs SNS, IAM done with least privilege, and the cloud-cost levers that move the needle.
3 articles · updated regularly
A VPC is just a CIDR block, a subnet is an AZ plus a slice of it, and "public" is a fact about a route table — not a checkbox. Here is the mental model that makes connectivity bugs obvious.
S3 is the most boring service that breaks the most production systems. Get these five patterns right and it disappears.
Cold starts are a percentile problem, not a feature problem. Here's the math, the levers, and when to stop optimising.