Marceli Grabowski
Technical notes

Technical notes from working with complex backend, cloud and legacy systems.

Notes on system takeover, pragmatic architecture, Kotlin/Java backend, cloud platforms and technical decision-making.

Purpose

Not a portfolio grid. Not a content machine. Just practical notes about how I reason through difficult systems.

Themes

LegacyCloudKotlinArchitectureIdentityObservabilityDecision-makingModernization

Published notes

May 30, 2026

How I approach legacy system takeover

Documentation is useful, but in a legacy takeover I treat it as a set of hypotheses until the system confirms it.

LegacyArchitectureModernizationDecision-making