Is system design needed for L4 / mid?

Sometimes — especially at Amazon and Meta for SDE II. From senior (L5+) it's almost always 1–2 dedicated rounds.

Whiteboard or Excalidraw?

Match the loop. In-person: whiteboard. Virtual: Excalidraw / Miro / Google Drawings. Speed of expression matters more than fidelity.

Yes — back-of-envelope math is expected. Memorise read/write latency tiers, typical QPS per node, storage per row of common types.

Different beast — feature stores, training/serving split, online vs batch, drift detection. Set the role to ML Engineer in the practice tool.

How to prep for system design interviews at senior+ levels — a reusable template, 6 must-know prompts, tradeoff drills and free practice tools.

Reviewed by Canadian recruitersJobeefy editorialPublished May 6, 2026Updated May 6, 20269 min read

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