Zettabyte

Small

Zettabyte is a technology company operating in the data infrastructure and analytics space, focused on helping organizations manage and process large volumes of data. It is a smaller company known for its data storage and management solutions.

5 interview notes · updated Jul 2026

Zettabyte·Software Engineer·Onsite - System Design / Architecture

Jun 2026

Had a system design round at Zettabyte for a full-stack role and the middleware question took up most of the session. More depth than I expected for what I assumed would be a surface-level topic.

Walk me through how you design and use middleware in your applications, including ordering, custom implementations, and how you test it.

“I started with the textbook definition and immediately felt like I was reciting a glossary.”

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Zettabyte·Frontend Engineer·Technical Phone Screen

Jun 2026

Zettabyte frontend interview that leaned heavily on architecture judgment rather than coding. The main question was a deep dive into rendering strategies and I felt reasonably prepared but still fumbled a few of the trade-off specifics.

How do you decide whether to use server-side rendering, static generation, or client-side rendering for a given page or application?

“This is broader than it sounds.”

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Zettabyte·Frontend Engineer·Technical Phone Screen

Jun 2026

Technical screen at Zettabyte for a frontend role. Most of the conversation centered on state management architecture, specifically how Zustand and TanStack Query fit together (or don't). Felt pretty solid on the conceptual stuff but stumbled a bit when they pushed on the anti-patterns.

What is Zustand used for, and how does it differ from TanStack Query in a React application?
What's wrong with storing fetched server data inside a Zustand store and writing your own refetch logic around it?
Can you describe a scenario where you'd use both Zustand and TanStack Query together in the same feature?

“I knew this one well enough.”

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Zettabyte·Software Engineer·Onsite - System Design / Architecture

May 2026

System design round at Zettabyte for a full-stack role. The whole session was basically one big multi-tenancy deep dive, which I was not expecting to go as broad as it did.

Walk me through the main isolation models for multi-tenant architecture and the trade-offs between them.
How do you propagate tenant identity through a request, from the edge all the way down to the data layer?
How would you prevent one tenant from degrading performance for others, and how do you handle tenant-specific configuration and customizations?
How do you handle backups and migrations in a multi-tenant setup, particularly when tenants may be on different versions of the schema?

“I knew the three models (separate database per tenant, shared database with separate schemas, shared database with a tenant_id column everywhere) but I fumbled the trade-off framing.”

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Zettabyte·Frontend Engineer·Technical Phone Screen

May 2026

Zettabyte is a GPU cloud company and they threw a pretty involved memory allocator problem at me for a frontend role, which I did not see coming. The problem had real depth to it and the data structure discussion went longer than I expected.

Design a GPU slot allocator with N slots (indexed 0 to N-1). Implement allocate(customerId, count) using best-fit strategy, release(customerId) with adjacent block merging, and getUsage() returning a map of customer slot counts.

“This was way more involved than I expected for a frontend screen.”

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