Blog

Notes on building software

Engineering write-ups, architecture decisions, and things we worked out the hard way. Some of it is about what we build; plenty of it isn't.

EngineeringArchitectureKafka

Keeping analytics off the hot path with Kafka

In a multi-tenant SaaS, one busy storefront can exhaust the connection pool every other merchant shares. Why Fitly's events go to an append-only log instead of straight into Postgres.

8 min read
ShopifyProductEngineering

Introducing Fitly: solving the returns problem at the source

Why we built a no-code Shopify size-chart app, and a few engineering decisions behind it — from serving charts through metafields to assignment that scales.

4 min read