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Jobs/Coinbase/Set up the round

Online practical assessment

Full practice round

Software Engineer · Coinbase90 min planned

Set up the room

We’ve set it up the way we’d suggest. Change what you like; we’ll tell you if a choice makes the feedback less useful.

Length

This practice round is 90 minutes.

Problem

Based on how this company interviews.

Difficulty

Senior, as planned for this job.

Who runs it

Someone you trust can take the interviewer seat.

How you’ll talk

Use voice for spoken practice, or text for a written conversation.

Hints while you work

A coach can nudge you privately. It never reaches your feedback.

The brief, in short

Open the full brief →

Expect to be pushed on

Add a requirement that changes state lifetime or lookup semantics.
Ask how the design behaves with missing, repeated, or expired records.

Do

  • Choose a simple model before adding features, then state its invariants.
  • Write code clearly and narrate a manual dry-run after each major change.

Avoid

  • Over-engineer before the required operations work.
  • Assume tests or execution will reveal defects; inspect the code manually instead.

Why this round, now

You picked this round yourself, so there’s no suggestion attached to it.

What we’re watching this round

Defines simple data structures and interfaces that support each stated operation and later requirement.

Done when

Finish the full 90-minute round at their level.

Read the full brief
Online practical assessment · 90 minWatching for: Defines simple data structures and interfaces that support each stated operation and later requirement.