Loading…
Also forDatabase EngineerDatabase Reliability EngineerCloud database engineer loops test one area far more deeply than a generalist loop does, and they punish vagueness. Expect to justify an engine choice from access patterns rather than from preference, to be precise about consistency and isolation, and to walk a live migration through its rollback plan. The questions frequently start broad and narrow quickly to whether you understand what the database is actually doing.
Engine selection and the reasoning behind it, replication and its lag, partitioning and the permanence of the partition key, a near-zero-downtime migration with a verification strategy, and a diagnosis scenario where a database is slow or saturated. Caching comes up as the layer in front, along with what happens to the database when it disappears.
Reaching for partitioning too early. It is the most disruptive change available and is frequently proposed when the real problem is a missing index, an N+1 query pattern, or insufficient memory — all of which are far cheaper and are what an interviewer expects you to exhaust first.
Prefer a sequence to a catalogue?
The 6-week Cloud Database Engineer study plan orders this material week by week, easiest first, with a free first week and progress derived from what you have already completed.
Fully unlocked, solutions included. Enough to see whether the format suits you.
Broad questions with no system to draw. Free, and frequently where this loop is decided.
Easiest first. 36 in total for this role.
At senior level it eliminates more candidates than the technical rounds do. Free interactive guides to the questions that come up most.
Deep enough that hand-waving is visible. Expect questions on how an index is structured, what an isolation level actually prevents, how replication lag arises and what it means for reading your own writes. You are not expected to have written a storage engine, but you are expected to know what the one you use is doing.
Very likely, and it is the question that separates candidates most. The design is well known; the assessment is sequencing, how you prove the two databases hold the same data, and where the point of no return sits.