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<link:definition>1027 - Disclosure - Leases (Tables)</link:definition>
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<link:definition>1028 - Disclosure - Income Taxes (Tables)</link:definition>
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<link:definition>1031 - Disclosure - Revenue from Contracts with Customers - Additional Information (Detail)</link:definition>
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<link:definition>1042 - Disclosure - Stock-Based Compensation - Additional Information (Detail)</link:definition>
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<link:definition>1043 - Disclosure - Credit Facility - Additional information (Detail)</link:definition>
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<link:definition>1044 - Disclosure - Income Taxes - Components of Income Before Income Taxes (Detail)</link:definition>
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<link:definition>1045 - Disclosure - Income Taxes - Provision for Income Taxes (Detail)</link:definition>
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<link:definition>1046 - Disclosure - Income Taxes - Reconciliation of Income Taxes (Detail)</link:definition>
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<link:definition>1047 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
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<link:definition>1049 - Disclosure - Fair Value Measurements - Additional Information (Detail)</link:definition>
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<link:definition>1050 - Disclosure - Shareholders' Equity - Additional Information (Detail)</link:definition>
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<link:definition>1051 - Disclosure - Earnings per Share - Additional Information (Detail)</link:definition>
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<link:definition>1052 - Disclosure - Business Segments and Geographic Information - Additional Information (Detail)</link:definition>
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<link:definition>1054 - Disclosure - Business Segments and Geographic Information - Summary of Assets by Segment (Detail)</link:definition>
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<link:definition>1055 - Disclosure - Business Segments and Geographic Information - Summary of Revenue from External Customers (Detail)</link:definition>
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<link:linkbaseRef xlink:type="simple" xlink:href="mhh-20220630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
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<import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
<import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
<import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
<import namespace="http://fasb.org/us-gaap/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd" />
<import namespace="http://xbrl.sec.gov/country/2022" schemaLocation="https://xbrl.sec.gov/country/2022/country-2022.xsd" />
<import namespace="http://xbrl.sec.gov/currency/2022" schemaLocation="https://xbrl.sec.gov/currency/2022/currency-2022.xsd" />
<import namespace="http://xbrl.sec.gov/exch/2022" schemaLocation="https://xbrl.sec.gov/exch/2022/exch-2022.xsd" />
<import namespace="http://xbrl.sec.gov/naics/2022" schemaLocation="https://xbrl.sec.gov/naics/2022/naics-2022.xsd" />
<import namespace="http://xbrl.sec.gov/sic/2022" schemaLocation="https://xbrl.sec.gov/sic/2022/sic-2022.xsd" />
<import namespace="http://xbrl.sec.gov/stpr/2022" schemaLocation="https://xbrl.sec.gov/stpr/2022/stpr-2022.xsd" />
<import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
<import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
<import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
<import namespace="http://xbrl.sec.gov/dei/2022" schemaLocation="https://xbrl.sec.gov/dei/2022/dei-2022.xsd" />
<import namespace="http://fasb.org/us-types/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-types-2022.xsd" />
<import namespace="http://fasb.org/srt-types/2022" schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-types-2022.xsd" />
<import namespace="http://fasb.org/srt/2022" schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd" />
<import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd" />
<element name="OtherComprehensiveIncomeLossOnIncomeTaxExpenseBenefit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_OtherComprehensiveIncomeLossOnIncomeTaxExpenseBenefit" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="PaymentsForRecoveryOfNoncurrentDeposits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_PaymentsForRecoveryOfNoncurrentDeposits" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="IncreaseDecreaseInOperatingLeaseAssetsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_IncreaseDecreaseInOperatingLeaseAssetsNet" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PayrollTaxLiabilityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_PayrollTaxLiabilityAbstract" substitutionGroup="xbrli:item" />
<element name="AccruedPayrollTaxesNoncurrentTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_AccruedPayrollTaxesNoncurrentTextBlock" substitutionGroup="xbrli:item" />
<element name="CreditFacilityDisclosureTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_CreditFacilityDisclosureTextBlock" substitutionGroup="xbrli:item" />
<element name="AccountingPrinciplesPolicyTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_AccountingPrinciplesPolicyTextBlock" substitutionGroup="xbrli:item" />
<element name="SignificantAccountingPoliciesPolicyTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_SignificantAccountingPoliciesPolicyTextBlock" substitutionGroup="xbrli:item" />
<element name="BusinessDescriptionPoliciesPolicyTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_BusinessDescriptionPoliciesPolicyTextBlock" substitutionGroup="xbrli:item" />
<element name="SummaryOfBalanceSheetClassificationOfLeaseAssetAndRelatedLeaseLiabilityTableTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_SummaryOfBalanceSheetClassificationOfLeaseAssetAndRelatedLeaseLiabilityTableTextBlock" substitutionGroup="xbrli:item" />
<element name="ReconciliationOfAssetsDepreciationAmortizationAndCapitalExpenditureFromSegmentToConsolidatedTableTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_ReconciliationOfAssetsDepreciationAmortizationAndCapitalExpenditureFromSegmentToConsolidatedTableTextBlock" substitutionGroup="xbrli:item" />
<element name="RevenueFromExternalCustomersAndLongLivedAssetsByGeographicAreasTableTextBlock" type="dtr-types:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_RevenueFromExternalCustomersAndLongLivedAssetsByGeographicAreasTableTextBlock" substitutionGroup="xbrli:item" />
<element name="CustomerPercentageOfRevenue" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_CustomerPercentageOfRevenue" substitutionGroup="xbrli:item" />
<element name="RevenuePercentageToAggregateRevenue" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_RevenuePercentageToAggregateRevenue" substitutionGroup="xbrli:item" />
<element name="MaximumPercentageOfBillableExpensesOnRevenueFromCustomer" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_MaximumPercentageOfBillableExpensesOnRevenueFromCustomer" substitutionGroup="xbrli:item" />
<element name="NumberOfCustomersAccountedForRevenues" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_NumberOfCustomersAccountedForRevenues" substitutionGroup="xbrli:item" />
<element name="CgiMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_CgiMember" substitutionGroup="xbrli:item" />
<element name="TopTenCustomersMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_TopTenCustomersMember" substitutionGroup="xbrli:item" />
<element name="DataAndAnalyticsServicesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_DataAndAnalyticsServicesMember" substitutionGroup="xbrli:item" />
<element name="ITStaffingServicesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_ITStaffingServicesMember" substitutionGroup="xbrli:item" />
<element name="IndiaAndOtherMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_IndiaAndOtherMember" substitutionGroup="xbrli:item" />
<element name="ScheduleOfIntangibleAssetsAndGoodwillTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_ScheduleOfIntangibleAssetsAndGoodwillTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="GoodwillAndIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_GoodwillAndIntangibleAssetsLineItems" substitutionGroup="xbrli:item" />
<element name="HudsonItMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_HudsonItMember" substitutionGroup="xbrli:item" />
<element name="InfoTrellisIncMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_InfoTrellisIncMember" substitutionGroup="xbrli:item" />
<element name="AmberLeafPartnersIncMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_AmberLeafPartnersIncMember" substitutionGroup="xbrli:item" />
<element name="CovenantNotToCompeteMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_CovenantNotToCompeteMember" substitutionGroup="xbrli:item" />
<element name="IntangibleLiabilityDisclosureAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_IntangibleLiabilityDisclosureAbstract" substitutionGroup="xbrli:item" />
<element name="LesseeOperatingLeasesRenewalTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_LesseeOperatingLeasesRenewalTerm" substitutionGroup="xbrli:item" />
<element name="ImputedInterestInRespectOfOperatingLeasesFutureMinimumRentalsPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_ImputedInterestInRespectOfOperatingLeasesFutureMinimumRentalsPayable" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="TypeOfSecurityTaxAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_TypeOfSecurityTaxAxis" substitutionGroup="xbrldt:dimensionItem" />
<element name="TypeOfSecurityTaxDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_TypeOfSecurityTaxDomain" substitutionGroup="xbrli:item" />
<element name="SocialSecurityTaxMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_SocialSecurityTaxMember" substitutionGroup="xbrli:item" />
<element name="CurrentLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_CurrentLiabilities" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="BalancesheetlocationaxisAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_BalancesheetlocationaxisAxis" substitutionGroup="xbrldt:dimensionItem" />
<element name="BalancesheetlocationaxisDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_BalancesheetlocationaxisDomain" substitutionGroup="xbrli:item" />
<element name="ShortTermPayrollTaxLiabiitiesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_ShortTermPayrollTaxLiabiitiesMember" substitutionGroup="xbrli:item" />
<element name="TaxSupportToEntityReliefActAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_TaxSupportToEntityReliefActAxis" substitutionGroup="xbrldt:dimensionItem" />
<element name="TaxSupportToEntityReliefActDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_TaxSupportToEntityReliefActDomain" substitutionGroup="xbrli:item" />
<element name="CoronavirusAidReliefAndEconomicSecurityActMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_CoronavirusAidReliefAndEconomicSecurityActMember" substitutionGroup="xbrli:item" />
<element name="StockOptionsAndRestrictedStockMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_StockOptionsAndRestrictedStockMember" substitutionGroup="xbrli:item" />
<element name="EmployeeStockPurchasePlanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_EmployeeStockPurchasePlanMember" substitutionGroup="xbrli:item" />
<element name="OfferingPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_OfferingPeriodAxis" substitutionGroup="xbrldt:dimensionItem" />
<element name="OfferingPeriodDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_OfferingPeriodDomain" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationMaximumLimitOfContributionsTowardsPlanPerPerson" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_ShareBasedCompensationMaximumLimitOfContributionsTowardsPlanPerPerson" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ShareBasedCompensationPercentageOfDiscountToPurchaseOfCommonStock" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_ShareBasedCompensationPercentageOfDiscountToPurchaseOfCommonStock" substitutionGroup="xbrli:item" />
<element name="SwingLoansMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_SwingLoansMember" substitutionGroup="xbrli:item" />
<element name="TermLoanMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_TermLoanMember" substitutionGroup="xbrli:item" />
<element name="RevolvingCreditFacilityPercentageMarginOverBaseRate" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_RevolvingCreditFacilityPercentageMarginOverBaseRate" substitutionGroup="xbrli:item" />
<element name="TermLoanPercentageMarginAdjustedLiborRate" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_TermLoanPercentageMarginAdjustedLiborRate" substitutionGroup="xbrli:item" />
<element name="LineOfCreditFacilityAdditionalBorrowingCapacityUponCertainConditions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_LineOfCreditFacilityAdditionalBorrowingCapacityUponCertainConditions" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PercentageOfEligibleAccountsReceivableUsedToDetermineBorrowingsAvailableUnderCreditFacility" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_PercentageOfEligibleAccountsReceivableUsedToDetermineBorrowingsAvailableUnderCreditFacility" substitutionGroup="xbrli:item" />
<element name="TermLoanPercentageMarginOverBaseRate" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_TermLoanPercentageMarginOverBaseRate" substitutionGroup="xbrli:item" />
<element name="PercentageOfEligibleUnbilledAccountsUsedToDetermineBorrowingsAvailableUnderCreditFacility" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_PercentageOfEligibleUnbilledAccountsUsedToDetermineBorrowingsAvailableUnderCreditFacility" substitutionGroup="xbrli:item" />
<element name="SeniorLeverageRatio" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_SeniorLeverageRatio" substitutionGroup="xbrli:item" />
<element name="RevolvingCreditFacilityPercentageMarginAdjustedLiborRate" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_RevolvingCreditFacilityPercentageMarginAdjustedLiborRate" substitutionGroup="xbrli:item" />
<element name="PncBankNaMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_PncBankNaMember" substitutionGroup="xbrli:item" />
<element name="FederalFundsRateMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_FederalFundsRateMember" substitutionGroup="xbrli:item" />
<element name="IncomeBeforeIncomeTaxesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_IncomeBeforeIncomeTaxesAbstract" substitutionGroup="xbrli:item" />
<element name="IncomeTaxReconciliationChangesInExcessTaxBenefitFromStockOptionsAndRestrictedShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_IncomeTaxReconciliationChangesInExcessTaxBenefitFromStockOptionsAndRestrictedShares" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="EffectiveIncomeTaxRateReconciliationChangesInExcessTaxBenefitFromStockOptionsAndRestrictedShares" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_EffectiveIncomeTaxRateReconciliationChangesInExcessTaxBenefitFromStockOptionsAndRestrictedShares" substitutionGroup="xbrli:item" />
<element name="DeferredTaxLiabilitiesValuationAllowance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="mhh_DeferredTaxLiabilitiesValuationAllowance" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="FairValueDisclosuresTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_FairValueDisclosuresTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="FairValueDisclosuresLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_FairValueDisclosuresLineItems" substitutionGroup="xbrli:item" />
<element name="BusinessCombinationCreditAgreement.Member" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mhh_BusinessCombinationCreditAgreement.Member" substitutionGroup="xbrli:item" />
<element name="InterestExpensesAndOtherNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_InterestExpensesAndOtherNet" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="GrossMarginPercentage" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="mhh_GrossMarginPercentage" substitutionGroup="xbrli:item" />
</schema>
