<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fec1a-535e-7e30-bf12-24a595076bad,g:afdd2695-91b7-426f-98fd-51d226838e68-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.viantinc.com/role/Cover" xlink:type="simple" xlink:href="dsp-20260810.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.viantinc.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019fec1a-535f-7a91-be2d-ba5d477c31d8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_DocumentType_019fec1a-535f-7a91-be2d-ba5d477c31d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019fec1a-535f-7b2f-a59c-554ccd336dc1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_DocumentPeriodEndDate_019fec1a-535f-7b2f-a59c-554ccd336dc1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019fec1a-535f-76c0-91b6-e25a7638414e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityRegistrantName_019fec1a-535f-76c0-91b6-e25a7638414e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019fec1a-535f-7f8c-8f55-7043329cb8f8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019fec1a-535f-7f8c-8f55-7043329cb8f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019fec1a-535f-709b-ba60-708ab7d927b0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityFileNumber_019fec1a-535f-709b-ba60-708ab7d927b0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019fec1a-535f-767a-97e3-6414042a0d1c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityTaxIdentificationNumber_019fec1a-535f-767a-97e3-6414042a0d1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019fec1a-535f-7a92-a860-fa2e29f19bed" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityAddressAddressLine1_019fec1a-535f-7a92-a860-fa2e29f19bed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019fec1a-535f-7697-bda7-2026aef0abb8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityAddressAddressLine2_019fec1a-535f-7697-bda7-2026aef0abb8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019fec1a-535f-78dd-9fbe-c2d5811e7226" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityAddressCityOrTown_019fec1a-535f-78dd-9fbe-c2d5811e7226" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019fec1a-535f-7a4a-bdc1-bd776d208381" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityAddressStateOrProvince_019fec1a-535f-7a4a-bdc1-bd776d208381" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019fec1a-535f-736d-a085-3331baf71dbd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityAddressPostalZipCode_019fec1a-535f-736d-a085-3331baf71dbd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019fec1a-535f-7473-93f8-b5bdd47556ae" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_CityAreaCode_019fec1a-535f-7473-93f8-b5bdd47556ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019fec1a-535f-7854-8a55-9849c55461c5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_LocalPhoneNumber_019fec1a-535f-7854-8a55-9849c55461c5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019fec1a-535f-7c2c-9bf6-5c00c80d70a4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_WrittenCommunications_019fec1a-535f-7c2c-9bf6-5c00c80d70a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019fec1a-535f-7554-9c52-d2e27f2d1659" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_SolicitingMaterial_019fec1a-535f-7554-9c52-d2e27f2d1659" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019fec1a-535f-7c9d-ae01-3f5444f025f1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_PreCommencementTenderOffer_019fec1a-535f-7c9d-ae01-3f5444f025f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019fec1a-535f-7ae5-a823-f937f70140e7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019fec1a-535f-7ae5-a823-f937f70140e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fec1a-535f-798b-8d46-1b988f0ac74e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_Security12bTitle_019fec1a-535f-798b-8d46-1b988f0ac74e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fec1a-535f-7a32-a3de-e3ad0338faf8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_TradingSymbol_019fec1a-535f-7a32-a3de-e3ad0338faf8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fec1a-535f-7f61-9d71-2e8f3a1a5b0a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_SecurityExchangeName_019fec1a-535f-7f61-9d71-2e8f3a1a5b0a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019fec1a-535f-71db-a56c-74cfcfe240df" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityEmergingGrowthCompany_019fec1a-535f-71db-a56c-74cfcfe240df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_019fec1a-535f-77f7-8ba7-73caca3a2c57" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityExTransitionPeriod"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityExTransitionPeriod_019fec1a-535f-77f7-8ba7-73caca3a2c57" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019fec1a-535f-7e41-8f54-161fd2b3c4ab" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_EntityCentralIndexKey_019fec1a-535f-7e41-8f54-161fd2b3c4ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019fec1a-535f-750b-b291-9f3a58db5d33" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fec1a-535f-72cd-9fcf-a9f2f0c7e038" xlink:to="loc_dei_AmendmentFlag_019fec1a-535f-750b-b291-9f3a58db5d33" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
