<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-02-26T19:27:39.9720670+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : f85be01745884953b37710023a850bf5 -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <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_SeriesOneCommonStockMember" name="SeriesOneCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConvertibleTermLoanMember" name="ConvertibleTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_SiliconValleyBankMember" name="SiliconValleyBankMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_AfterJanuaryOneTwoThousandAndTwentyMember" name="AfterJanuaryOneTwoThousandAndTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_AfterJanuaryOneTwoThousandAndTwentyOneMember" name="AfterJanuaryOneTwoThousandAndTwentyOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_AfterJanuaryOneTwoThousandAndTwentyTwoMember" name="AfterJanuaryOneTwoThousandAndTwentyTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyConvertibleLoanMember" name="TwoThousandTwentyConvertibleLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_PriorToJanuaryOneTwoThousandTwentyTwoMember" name="PriorToJanuaryOneTwoThousandTwentyTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_FromJanuaryOneTwoThousandTwentyTwoAndPriorToJanuaryOneTwoThousandTwentyThreeMember" name="FromJanuaryOneTwoThousandTwentyTwoAndPriorToJanuaryOneTwoThousandTwentyThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_FromJanuaryOneTwoThousandTwentyThreeAndPriorToJanuaryOneTwoThousandTwentyFourMember" name="FromJanuaryOneTwoThousandTwentyThreeAndPriorToJanuaryOneTwoThousandTwentyFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_FromAfterJanuaryOneTwoThousandTwentyFourMember" name="FromAfterJanuaryOneTwoThousandTwentyFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConvertedWithinEighteenMonthsMember" name="ConvertedWithinEighteenMonthsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConvertedBetweenEighteenMonthsAndTwentyFourMonthsMember" name="ConvertedBetweenEighteenMonthsAndTwentyFourMonthsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConvertedBetweenTwentyFourMonthsAndMaturityMember" name="ConvertedBetweenTwentyFourMonthsAndMaturityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandEighteenTermLoanMember" name="TwoThousandEighteenTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_AmendedAndRestatedLoanAndSecurityAgreementMember" name="AmendedAndRestatedLoanAndSecurityAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_MezzanineLoanAndSecurityAgreementMember" name="MezzanineLoanAndSecurityAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_WestRiverInnovationLendingFundViiilpMember" name="WestRiverInnovationLendingFundViiilpMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ConversionOfRequiredMinimumReturn" name="ConversionOfRequiredMinimumReturn" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <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_LineOfCreditFacilityCovenantToMaintainRevenueGrowthRateForEachQuarter" name="LineOfCreditFacilityCovenantToMaintainRevenueGrowthRateForEachQuarter" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_LineOfCreditFacilityCovenantToMaintainMinimumLiquidityRatio" name="LineOfCreditFacilityCovenantToMaintainMinimumLiquidityRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_PercentageOfCommonStockIssuedAndOutstanding" name="PercentageOfCommonStockIssuedAndOutstanding" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="bigc_SharesReservedForVestingOfRestrictedStockUnitsAndMarketStockUnits" name="SharesReservedForVestingOfRestrictedStockUnitsAndMarketStockUnits" type="xbrli:sharesItemType" 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="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandThirteenStockOptionPlanMember" name="TwoThousandThirteenStockOptionPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_SeriesOneAndSeriesTwoCommonStockMember" name="SeriesOneAndSeriesTwoCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandTwentyPlanMember" name="TwoThousandTwentyPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ManagementAndCertainOtherEmployeesMember" name="ManagementAndCertainOtherEmployeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_TwoThousandThirteenPlanMember" name="TwoThousandThirteenPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="bigc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrossFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="bigc_PreferredStockAdjustedDividendRatePercentage" name="PreferredStockAdjustedDividendRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation" name="EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="bigc_EffectiveIncomeTaxRateReconciliationPermanentDifferences" name="EffectiveIncomeTaxRateReconciliationPermanentDifferences" type="num: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_AntidilutiveSecuritiesExcludedFromComputationsOfEarningsPerShareAbstract" name="AntidilutiveSecuritiesExcludedFromComputationsOfEarningsPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
