Senior Platform & Infrastructure Engineer

Aleksander Gosk

I build and tend the cloud platforms teams ship on - AWS, Terraform, and Ruby on Rails - with a bias for reliability, cost efficiency, and paved roads that make the right thing the easy thing.

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Selected wins

// most recent first

2026 · Q1Performance

Cut a Rails API's CI test suite from 11 minutes to under 3

Traced a months-long CI-vs-local gap to production networking middleware (retries + DNS SRV lookups) running inside the test suite, and added a first-class test mode to the shared HTTP client.

impact → CI runtime −75% · ~19h reclaimed and counting

Read the writeup →

Writing

// notes from the work

Mar 2026 Performance · CI/CDCutting CI running tests from 11 minutes to 3 →

Stack

// day-to-day

Cloud & Infra

AWSTerraformLambda ECS / FargateGraviton / ARM64GitHub Actions

Languages & Runtime

Ruby on RailsGoBash

Observability

DatadogCloudWatchPagerDuty

Ways of working

IaC everythingCost-aware designPaved roadsBlameless postmortems