Lightspeed Backend Engineer Interview Questions

The questions to prepare for a Lightspeed Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

4questions

~1htotal time

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Behavioral & LeadershipStart here. 3 questions · ~24 min

Tests teamwork, collaboration, accountability, and the candidate’s contribution to a healthy team culture.

Challenging Project ExperienceMedium

Tests ownership, prioritization, and leadership through a difficult project example.

OwnershipbehavioralPrioritizationLLightspeed

Deep Dive Into a ProjectHard

Tests technical ownership, decision quality, optimization judgment, and the ability to explain individual impact with precision.

AIaccountabilitybehavioralLLightspeed

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min

Approach a mixed interview round while summarizing completed activity with a CTE, aggregation, and left join.

Join two tables and derive palindrome, reversed-substring, and character-frequency results with PostgreSQL.

Explain a SQL statement’s result, plus basic PostgreSQL key and data type concepts.

The finish line: interview-readyComplete all 4 questions plus 3 hands-on drills to finish this plan.