Dataford
Top 17
Prep plan
Updated weekly · Last refresh Aug 30

BlockFi Software Engineer Interview Questions

The questions to prepare for a BlockFi Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

17questions
~2htotal time
Track your progressSign up free to work through all 17 questions and resume where you left off.
Start practicing free →
1
System DesignStart here. 5 questions · ~41 min
High-Concurrency Wallet BalancesHard

Tests system design for concurrency control and data integrity in BlockFi wallet balance updates.

concurrencyrace conditionsBlockFi
Traffic Spikes During VolatilityHard

Tests scalability and reliability planning for BlockFi during peak demand and market volatility.

rate limitingBlockFi
More System Design questions with a free account
2
Behavioral & Leadership6 questions · ~49 min
More Behavioral & Leadership questions with a free account
3
More topics6 questions · ~49 min
Idempotent Recurring Posting PipelineHard

Design an idempotent recurring posting pipeline so payments are never applied twice.

OrchestrationIdempotencyQualityBlockFi
Optimize Blocking SQL QueryHard

Tests SQL performance tuning and strategies to reduce blocking in high-write transactional systems.

Performance Tuningtransactionsdata integrityBlockFi
Networking FundamentalsMedium

Tests understanding of core networking protocols and how they relate to network behavior.

NetworkingprotocolsBlockFi
React Hooks Interview ReadinessMedium

Assesses your practical knowledge of React hooks and how you apply them in real code.

reactBlockFi
Dealing With Data Provider FlakinessHard

Evaluates reliability strategies for time-sensitive financial data ingestion and user-facing correctness.

BlockFi
Coding Fundamentals PracticeMedium

Assesses your readiness for common coding challenges relevant to BlockFi’s day-to-day engineering work.

technical skillsBlockFi

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Duplicate Record DetectionEasy
Practice
Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
Finding Duplicate Records in SQLMedium
Practice
Practice drill

Find repeated posted transactions in Smc³ CarrierConnect using a CTE, GROUP BY, HAVING, and a LEFT JOIN.

Group BytransactionsSmc³U.S. Bank
SQL Joins for TransactionsMedium
Practice
Practice drill

Combine customer transactions and optional notes using INNER JOIN, LEFT JOIN, aggregation, and conditional spend bands.

JoinsData WranglingtransactionsSupernova TechnologyDeloitte
The finish line: interview-readyComplete all 17 questions plus 3 hands-on drills to finish this plan.