CodingLevel 4

Backend internals

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StatusFormatCompany style
Easy
IP address validationWrite code · Cisco styleCisco styleWrite codeCisco style15 minPercent decode URLWrite code · Stripe styleStripe styleWrite codeStripe style15 minMAC address normalizationWrite code · Cisco styleCisco styleWrite codeCisco style15 minRun-length encoding codecWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style20 minHeap file page wasteWrite code · Oracle styleOracle styleWrite codeOracle style15 minTransaction crash recoveryWrite code · Oracle styleOracle styleWrite codeOracle style16 minComposite index prefix matchWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style14 minRow store vs column storeWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style15 minQuorum write safetyWrite code · Amazon styleAmazon styleWrite codeAmazon style14 minCluster split majorityWrite code · Amazon styleAmazon styleWrite codeAmazon style14 minGossip build propagationWrite codeWrite code15 minRadio frame payloadsWrite code · Cisco styleCisco styleWrite codeCisco style14 min
Medium
CIDR subnet rangeWrite code · Cisco styleCisco styleWrite codeCisco style20 minTCP segment reassemblyWrite code · Cisco styleCisco styleWrite codeCisco style25 minOrdered index range queryWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style25 minSlab allocatorWrite code · Microsoft styleMicrosoft styleWrite codeMicrosoft style30 minKey-value snapshotsWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style30 minByte quota enforcementWrite codeWrite code25 minOrdered index range scanWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style25 minQuorum read consistency decisionWrite code · Amazon styleAmazon styleWrite codeAmazon style25 minPN-counter CRDT replica mergeWrite code · Figma styleFigma styleWrite codeFigma style25 minGossip dissemination roundsWrite code · Amazon styleAmazon styleWrite codeAmazon style28 minRead repair stale replicasWrite code · Amazon styleAmazon styleWrite codeAmazon style25 minSloppy quorum with hinted handoffWrite code · Amazon styleAmazon styleWrite codeAmazon style28 min
Hard
CLOCK page cacheWrite code · Oracle styleOracle styleWrite codeOracle style35 minMulti-version key-value storeWrite code · Oracle styleOracle styleWrite codeOracle style35 minLSM-tree compactionWrite code · Meta styleMeta styleWrite codeMeta style35 minSecondary index queriesWrite code · Snowflake styleSnowflake styleWrite codeSnowflake style30 minCost-based optimizer choiceWrite code · Oracle styleOracle styleWrite codeOracle style30 minCovering index scanWrite code · Oracle styleOracle styleWrite codeOracle style30 minB-tree leaf insert and rangeWrite code · Oracle styleOracle styleWrite codeOracle style35 minRaft commit index from matchIndexWrite code · Databricks styleDatabricks styleWrite codeDatabricks style35 minHybrid Logical Clock updateWrite code · Google styleGoogle styleWrite codeGoogle style32 minOR-Set CRDT replica mergeWrite code · Figma styleFigma styleWrite codeFigma style32 minMVCC snapshot isolation visibilityWrite code · Oracle styleOracle styleWrite codeOracle style30 minSemantic version comparisonWrite codeWrite code28 min