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Preptima

Blockchain Engineer Interview Prep & Rubrics

Smart contract auditing and decentralized systems.

The loop, in order

  1. Blockchain & Web36 questions · 2 topicsSmart contracts, consensus, and decentralised architecture.
  2. Backend Engineering30 questions · 7 topicsLanguage-agnostic service engineering: the protocols, boundaries, and failure handling that sit between a coding round and a full system design round.
  3. System Design70 questions · 12 topicsOpen-ended design rounds broken into the building blocks they draw on, plus full case studies worked end to end with explicit trade-off reasoning.
  4. Behavioural & Culture Fit25 questions · 8 topicsThe round candidates most often under-prepare, treated as a skill with structure rather than small talk, including the rubric interviewers score against.

Latest for this track

mediumScenarioCoding

You are dropped into an unfamiliar repository with one failing business rule and an AI assistant that only gives hints. What do you do in the first ten minutes?

Debugging an unfamiliar codebase starts by running the failing test, then reading it as the rule and tracing its call path to the code that computes the wrong value. Let the size of the error narrow the cause, ask the assistant to locate and explain rather than patch, and prove the fix with a test that failed before.

Backend Scenarios5 minmid, senior