<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2022-03-01T20:16:36.2466607+00:00 -->
<!-- Version            : 5.0.1.728 -->
<!-- Package ID         : 5fea905d6bbd4b1687a26216be588502 -->
<!-- Copyright (c) 2022 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="bigc_StockIssuedDuringPeriodShareConversionOfConvertibleDebtSecurities" name="StockIssuedDuringPeriodShareConversionOfConvertibleDebtSecurities" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_DividendsPreferredStockPayments" name="DividendsPreferredStockPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_TemporaryEquityIncreaseDecreaseOfDividends" name="TemporaryEquityIncreaseDecreaseOfDividends" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_TemporaryEquityPaymentOfDividend" name="TemporaryEquityPaymentOfDividend" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_TemporaryEquityAccretionOfIssuanceCosts" name="TemporaryEquityAccretionOfIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_AccretionOnDiscountToMarketableSecurities" name="AccretionOnDiscountToMarketableSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_IncreaseDecreaseInDeferredCommissions" name="IncreaseDecreaseInDeferredCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_IncreaseDecreaseInAccruedAndOtherCurrentLiabilities" name="IncreaseDecreaseInAccruedAndOtherCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_PurchaseOfCappedCalls" name="PurchaseOfCappedCalls" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_ProceedsFromIssuanceSecondaryPublicOffering" name="ProceedsFromIssuanceSecondaryPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_ProceedsFromExerciseOfStockOptionsAndWarrants" name="ProceedsFromExerciseOfStockOptionsAndWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_CommitmentsContingenciesAndLeasesTextBlock" name="CommitmentsContingenciesAndLeasesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_CommitmentsContingenciesAndLeasesAbstract" name="CommitmentsContingenciesAndLeasesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_RestrictedCashPolicyTextBlock" name="RestrictedCashPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_ScheduleOfEstimatedUsefulLivesOfPropertyAndEquipmentTableTextBlock" name="ScheduleOfEstimatedUsefulLivesOfPropertyAndEquipmentTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EstimatedFairValueOfOurCashEquivalentsAndMarketableSecuritiesTableTextBlock" name="EstimatedFairValueOfOurCashEquivalentsAndMarketableSecuritiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_ScheduleOfInterestExpenseRecognizedTableTextBlock" name="ScheduleOfInterestExpenseRecognizedTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_AccountReceivablePaymentTerms" name="AccountReceivablePaymentTerms" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_OneStrategicPartnerMember" name="OneStrategicPartnerMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConcentrationRiskNumberOfCustomer" name="ConcentrationRiskNumberOfCustomer" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_BusinessCombinationMeasurementPeriod" name="BusinessCombinationMeasurementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_FirstContingentCompensationArrangementPaymentsOverServicePeriod" name="FirstContingentCompensationArrangementPaymentsOverServicePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_SecondContingentCompensationArrangementPaymentsOverServicePeriod" name="SecondContingentCompensationArrangementPaymentsOverServicePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_BusinessCombinationAcquisitionRelatedSpend" name="BusinessCombinationAcquisitionRelatedSpend" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_BusinessCombinationCompensationExpenseRelatedToContingentCompensation" name="BusinessCombinationCompensationExpenseRelatedToContingentCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_PartnerAndServicesMember" name="PartnerAndServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ContractWithCustomerPeriod" name="ContractWithCustomerPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_ImpairmentOfDeferredCommissions" name="ImpairmentOfDeferredCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_AmortizationOfDeferredSalesCommissionsEstimatedPeriod" name="AmortizationOfDeferredSalesCommissionsEstimatedPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_DeferredSalesCommissions" name="DeferredSalesCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_SeniorNotesZeroPointTwoFivePercentDueTwoThousandTwentySixMember" name="SeniorNotesZeroPointTwoFivePercentDueTwoThousandTwentySixMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_FeedonomicsLLCMember" name="FeedonomicsLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_QuoteNinjaIncMember" name="QuoteNinjaIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_CompletedTechnologyMember" name="CompletedTechnologyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndAccruedLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndAccruedLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerPrepaidLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerPrepaidLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_BusinessCombinationPurchasePricePostCloseAdjustmentConsiderationTransferred" name="BusinessCombinationPurchasePricePostCloseAdjustmentConsiderationTransferred" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_BusinessCombinationContingentCompensation" name="BusinessCombinationContingentCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_BusinessCombinationsExistingProductsAndFinancialMilestones" name="BusinessCombinationsExistingProductsAndFinancialMilestones" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_BusinessCombinationAdditionalCompensationExpenseRelatedToContingentCompensation" name="BusinessCombinationAdditionalCompensationExpenseRelatedToContingentCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_DevelopedTechnologyMember" name="DevelopedTechnologyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_NonCompeteAgreementMember" name="NonCompeteAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_BusinessCombinationProFormaInformationReductionInTransactionRelatedCosts" name="BusinessCombinationProFormaInformationReductionInTransactionRelatedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_BusinessCombinationProFormaInformationIncreaseInAmortizationOfIntangible" name="BusinessCombinationProFormaInformationIncreaseInAmortizationOfIntangible" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_BusinessCombinationProFormaInformationReductionInPostAcquisitionCompensation" name="BusinessCombinationProFormaInformationReductionInPostAcquisitionCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_BusinessCombinationProFormaInformationIncreaseInPostAcquisitionCompensation" name="BusinessCombinationProFormaInformationIncreaseInPostAcquisitionCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableOnFirstAndSecondAnniversariesOfClosing" name="BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableOnFirstAndSecondAnniversariesOfClosing" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_RecordedUnconditionalPurchaseObligationsDueInThirdYearAndThereafter" name="RecordedUnconditionalPurchaseObligationsDueInThirdYearAndThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_LeaseOperatingLeaseExpirationYear" name="LeaseOperatingLeaseExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_OperatingLeaseShortTermRentExpense" name="OperatingLeaseShortTermRentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_AcquisitionRelatedCompensationCurrent" name="AcquisitionRelatedCompensationCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_OtherLiabilitiesDisclosureLineItems" name="OtherLiabilitiesDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_OtherLiabilitiesDisclosureTable" name="OtherLiabilitiesDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_FeedonomicsLimitedLiabilityCompanyAndBusinessToBusinessMember" name="FeedonomicsLimitedLiabilityCompanyAndBusinessToBusinessMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ZeroPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember" name="ZeroPointTwoFivePercentageConvertibleSeniorNotesDueTwoThousandTwentySixMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwentyTradingDaysPeriodMember" name="TwentyTradingDaysPeriodMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TenTradingDaysPeriodMember" name="TenTradingDaysPeriodMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyOneCappedCallTransactionsMember" name="TwoThousandTwentyOneCappedCallTransactionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConvertibleTermLoanMember" name="ConvertibleTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_Series1CommonStocksMember" name="Series1CommonStocksMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_SiliconValleyBankMember" name="SiliconValleyBankMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyConvertibleLoanMember" name="TwoThousandTwentyConvertibleLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandEighteenTermLoanMember" name="TwoThousandEighteenTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_MezzanineLoanAndSecurityAgreementMember" name="MezzanineLoanAndSecurityAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_WestRiverInnovationLendingFundVIIILPMember" name="WestRiverInnovationLendingFundVIIILPMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_DebtInstrumentConvertibleConversionRatioDenominator" name="DebtInstrumentConvertibleConversionRatioDenominator" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_ProceedsFromSeniorConvertibleNotesUsedForCappedCallTransactions" name="ProceedsFromSeniorConvertibleNotesUsedForCappedCallTransactions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_PercentageOfPremiumOfCapPriceOverLastReportedSalePricePerCommonShare" name="PercentageOfPremiumOfCapPriceOverLastReportedSalePricePerCommonShare" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_InitialPublicOfferingCompletionDate" name="InitialPublicOfferingCompletionDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_RepaymentOfPaidPrincipalAmount" name="RepaymentOfPaidPrincipalAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_LineOfCreditFacilityIncreaseAmended" name="LineOfCreditFacilityIncreaseAmended" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_ClassOfWarrantOrRightNumberOfWarrantExercisedByWarrantsOrRights" name="ClassOfWarrantOrRightNumberOfWarrantExercisedByWarrantsOrRights" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_PercentageOfCommonStockIssuedAndOutstanding" name="PercentageOfCommonStockIssuedAndOutstanding" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="bigc_CommonStockCapitalSharesAvailableForFutureIssuance" name="CommonStockCapitalSharesAvailableForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="bigc_UncategorizedAbstract" name="UncategorizedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyEquityIncentivesPlanMember" name="TwoThousandTwentyEquityIncentivesPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_SeriesOneAndSeriesTwoCommonStockMember" name="SeriesOneAndSeriesTwoCommonStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandThirteenEquityIncentivePlanMember" name="TwoThousandThirteenEquityIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyPlanMember" name="TwoThousandTwentyPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyOneInducementPlanMember" name="TwoThousandTwentyOneInducementPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ManagementAndCertainOtherEmployeesMember" name="ManagementAndCertainOtherEmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandThirteenPlanMember" name="TwoThousandThirteenPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsRelatedToAcquisition" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsRelatedToAcquisition" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_PreferredStockAdjustedDividendRatePercentage" name="PreferredStockAdjustedDividendRatePercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EffectiveIncomeTaxRateReconciliationPurchasePriceAccounting" name="EffectiveIncomeTaxRateReconciliationPurchasePriceAccounting" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation" name="EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EffectiveIncomeTaxRateReconciliationTaxCreditsAddback" name="EffectiveIncomeTaxRateReconciliationTaxCreditsAddback" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EffectiveIncomeTaxRateReconciliationPermanentDifferences" name="EffectiveIncomeTaxRateReconciliationPermanentDifferences" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_DeferredTaxAssetsLeasingArrangements" name="DeferredTaxAssetsLeasingArrangements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_DeferredTaxAssetsDepreciationAndAmortization" name="DeferredTaxAssetsDepreciationAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_DeferredTaxLiabilitiesDeferredCommission" name="DeferredTaxLiabilitiesDeferredCommission" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_DeferredTaxLiabilitiesPrepaidExpensesAndOther" name="DeferredTaxLiabilitiesPrepaidExpensesAndOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_DeferredTaxAssetsOperatingLossCarryforwardsDomesticPriorYear" name="DeferredTaxAssetsOperatingLossCarryforwardsDomesticPriorYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_OperatingLossCarryforwardsExpirationYear" name="OperatingLossCarryforwardsExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_NetOperatingLossCarryforwardsExpirationYear" name="NetOperatingLossCarryforwardsExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_DeferredTaxAssetsOperatingLossCarryforwardsDomesticToFuturePeriod" name="DeferredTaxAssetsOperatingLossCarryforwardsDomesticToFuturePeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentDomestic" name="DeferredTaxAssetsTaxCreditCarryforwardsResearchAndDevelopmentDomestic" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_TaxCreditsBeginToExpirationYear" name="TaxCreditsBeginToExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_OperatingLossCarryforwardsIncreaseDecreaseInValuationAllowanceForInitialPublicOfferingCostsBookedToEquity" name="OperatingLossCarryforwardsIncreaseDecreaseInValuationAllowanceForInitialPublicOfferingCostsBookedToEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="bigc_Series2CommonStocksMember" name="Series2CommonStocksMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_AntidilutiveSecuritiesExcludedFromComputationsOfEarningsPerShareAbstract" name="AntidilutiveSecuritiesExcludedFromComputationsOfEarningsPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_AcquisitionRelatedCompensationMember" name="AcquisitionRelatedCompensationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
