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cloud and cost

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Mumbai and Virginia two hundred milliseconds apart on a night map, comparing active-passive and active-active replication, synchronous against asynchronous writes, and partitioning users so each row has one home region

Cloud & CostDay 71Oct 12, 2026

Two Regions, One Truth

system-design cloud-and-cost multi-region

Two services with identical dashboards and twenty-fold different cost per request, beside on-demand, reserved and spot capacity matched to steady, bursty and interruptible workloads

Cloud & CostDay 70Oct 11, 2026

The Metric Nobody Puts On The Dashboard

system-design cloud-and-cost finops

A long-lived access key leaking into a repo, a pipeline, a laptop and a config file, beside an assumed role handing out credentials that expire in an hour, with least-privilege policies and an explicit deny overriding every allow

Cloud & CostDay 69Oct 10, 2026

Nobody Should Own A Key

system-design cloud-and-cost iam

A folder tree beside a flat S3 keyspace where every path is one key with slashes, with storage classes matched to access patterns, lifecycle rules moving objects to colder tiers, and presigned uploads going straight to the bucket

Cloud & CostDay 68Oct 9, 2026

Storage That Isn’t A Disk

system-design cloud-and-cost object-storage

A traffic graph where load doubles at 9:00, the autoscaler notices at 9:02 and new instances serve at 9:06, with the request queue timing out in the six-minute gap

Cloud & CostDay 67Oct 8, 2026

Capacity That Arrives After The Rush

system-design cloud-and-cost autoscaling

A region drawn as a city and availability zones as separate buildings a millisecond apart, comparing single-AZ, multi-AZ and multi-region deployments, and the configuration changes that travel to all of them at once

Cloud & CostDay 66Oct 7, 2026

How Much Can One Failure Take With It?

system-design cloud-and-cost availability-zones

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