diff --git a/go.mod b/go.mod
index d4194cb..d7aa886 100644
--- a/go.mod
+++ b/go.mod
@@ -20,8 +20,30 @@
 	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect
 	golang.org/x/mod v0.4.2
 	golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420 // indirect
-	golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac // indirect
+	golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	cloud.google.com/go v0.97.0 // indirect
+	cloud.google.com/go/firestore v1.6.1 // indirect
+	github.com/census-instrumentation/opencensus-proto v0.2.1 // indirect
+	github.com/cespare/xxhash v1.1.0 // indirect
+	github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403 // indirect
+	github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed // indirect
+	github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0 // indirect
+	github.com/envoyproxy/protoc-gen-validate v0.1.0 // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/googleapis/gax-go/v2 v2.1.1 // indirect
+	go.opencensus.io v0.23.0 // indirect
+	golang.org/x/oauth2 v0.0.0-20211005180243-6b3c2da341f1 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	google.golang.org/api v0.60.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto v0.0.0-20211028162531-8db9c33dc351 // indirect
+	google.golang.org/grpc v1.40.0 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+)
diff --git a/go.sum b/go.sum
index cd3bec2..bb4035c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,21 +1,98 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
+cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
+cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
+cloud.google.com/go v0.97.0 h1:3DXvAyifywvq64LfkKaMOmkWPS1CikIQdMe2lY9vxU8=
+cloud.google.com/go v0.97.0/go.mod h1:GF7l59pYBVlXQIBLx3a761cZ41F9bBH3JUlihCt2Udc=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/firestore v1.6.1 h1:8rBq3zRjnHx8UtBvaOWqBB1xq9jH6/wltfQLlTMh2Fw=
+cloud.google.com/go/firestore v1.6.1/go.mod h1:asNXNOzBdyVQmEU+ggO8UPodTkEVFW5Qx+rwHnAz+EY=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
 github.com/Microsoft/go-winio v0.4.16 h1:FtSW/jqD+l4ba5iPBj9CODVtgfYAD8w2wS923g/cFDk=
 github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7 h1:YoJbenK9C67SkzkDfmQuVln04ygHj3vjZfd9FL+GmQQ=
 github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
 github.com/acomagu/bufpipe v1.0.3 h1:fxAGrHZTgQ9w5QqVItgzwj235/uYZYgbXitB+dLupOk=
 github.com/acomagu/bufpipe v1.0.3/go.mod h1:mxdxdup/WdsKVreO5GpW4+M/1CE2sMG4jeGJ2sYmHc4=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/census-instrumentation/opencensus-proto v0.2.1 h1:glEXhBS5PSLLv4IXzLA5yPRVX4bilULVyxxbrfOtDAk=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403 h1:cqQfy1jclcSy/FwLjemeg3SR1yaINm74aQyupQ0Bl8M=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed h1:OZmjad4L3H8ncOIR8rnb5MREYqG8ixi5+WbeUsquF0c=
+github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/emirpasic/gods v1.12.0 h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=
 github.com/emirpasic/gods v1.12.0/go.mod h1:YfzfFFoVP/catgzJb4IKIqXjX78Ha8FMSDh3ymbK86o=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.7/go.mod h1:cwu0lG7PUMfa9snN8LXBig5ynNVH9qI8YYLbd1fK2po=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0 h1:dulLQAYQFYtG5MTplgNGHWuV2D+OBD+Z8lmDBmbLg+s=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
+github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gliderlabs/ssh v0.2.2 h1:6zsha5zo/TWhRhwqCD3+EarCAgZ2yN28ipRnGPnwkI0=
 github.com/gliderlabs/ssh v0.2.2/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
 github.com/go-git/gcfg v1.5.0 h1:Q5ViNfGF8zFgyJWPqYwA7qGFoMTEiBmdlkcfRmpIMa4=
@@ -27,16 +104,97 @@
 github.com/go-git/go-git-fixtures/v4 v4.2.1/go.mod h1:K8zd3kDUAykwTdDCr+I0per6Y6vMiRR/nnVTBtavnB0=
 github.com/go-git/go-git/v5 v5.4.2 h1:BXyZu9t0VkbiHtqrsvdq39UDhGJTl1h55VW6CSC4aY4=
 github.com/go-git/go-git/v5 v5.4.2/go.mod h1:gQ1kArt6d+n+BGd+/B/I74HwRTLhth2+zti4ihgckDc=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e h1:1r7pUrabqp18hOBcwBwiTsbnFeTZHV9eER/QT5JVZxY=
+github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
+github.com/golang/mock v1.4.0/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
+github.com/golang/mock v1.4.1/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
+github.com/golang/mock v1.4.3/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
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diff --git a/internal/worker/store/fire_store.go b/internal/worker/store/fire_store.go
new file mode 100644
index 0000000..d1266a4
--- /dev/null
+++ b/internal/worker/store/fire_store.go
@@ -0,0 +1,219 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package store
+
+import (
+	"context"
+	"errors"
+	"sort"
+
+	"cloud.google.com/go/firestore"
+	"golang.org/x/vuln/internal/derrors"
+	"google.golang.org/api/iterator"
+)
+
+// FireStore is a Store implemented with Google Cloud Firestore.
+//
+// A Firestore DB is a set of documents. Each document has its own unique ID
+// (primary key). Documents are grouped into collections, and each document can
+// have sub-collections. A document can be referred to by a path of the form
+// top-level-collection/doc/sub-collection/doc/...
+//
+// In this layout, there is a single top-level collection called Namespaces,
+// with documents for each development environment. Within each namespace, there
+// are two collections: CVEs for CVERecords, and Updates for UpdateRecords.
+type FireStore struct {
+	namespace string
+	client    *firestore.Client
+	nsDoc     *firestore.DocumentRef
+}
+
+const (
+	namespaceCollection = "Namespaces"
+	updateCollection    = "Updates"
+	cveCollection       = "CVEs"
+)
+
+// NewFireStore creates a new FireStore, backed by a client to Firestore. Since
+// each project can have only one Firestore database, callers must provide a
+// non-empty namespace to distinguish different virtual databases (e.g. prod and
+// testing).
+func NewFireStore(ctx context.Context, projectID, namespace string) (_ *FireStore, err error) {
+	defer derrors.Wrap(&err, "NewFireStore(%q, %q)", projectID, namespace)
+
+	if namespace == "" {
+		return nil, errors.New("empty namespace")
+	}
+	client, err := firestore.NewClient(ctx, projectID)
+	if err != nil {
+		return nil, err
+	}
+	return &FireStore{
+		namespace: namespace,
+		client:    client,
+		nsDoc:     client.Collection(namespaceCollection).Doc(namespace),
+	}, nil
+}
+
+// CreateUpdateRecord implements Store.CreateUpdateRecord.
+// On successful return, r.ID is set to the record's ID.
+func (fs *FireStore) CreateUpdateRecord(ctx context.Context, r *UpdateRecord) (err error) {
+	defer derrors.Wrap(&err, "CreateUpdateRecord()")
+
+	docref := fs.nsDoc.Collection(updateCollection).NewDoc()
+	if _, err := docref.Create(ctx, r); err != nil {
+		return err
+	}
+	r.ID = docref.ID
+	return nil
+}
+
+// SetUpdateRecord implements Store.SetUpdateRecord.
+func (fs *FireStore) SetUpdateRecord(ctx context.Context, r *UpdateRecord) (err error) {
+	defer derrors.Wrap(&err, "SetUpdateRecord(%q)", r.ID)
+
+	if r.ID == "" {
+		return errors.New("missing ID")
+	}
+	_, err = fs.nsDoc.Collection(updateCollection).Doc(r.ID).Set(ctx, r)
+	return err
+}
+
+// ListUpdateRecords implements Store.ListUpdateRecords.
+func (fs *FireStore) ListUpdateRecords(ctx context.Context) ([]*UpdateRecord, error) {
+	var urs []*UpdateRecord
+	iter := fs.nsDoc.Collection(updateCollection).Documents(ctx)
+	for {
+		docsnap, err := iter.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+		var ur UpdateRecord
+		if err := docsnap.DataTo(&ur); err != nil {
+			return nil, err
+		}
+		ur.ID = docsnap.Ref.ID
+		urs = append(urs, &ur)
+	}
+	sort.Slice(urs, func(i, j int) bool {
+		return urs[i].StartedAt.After(urs[j].StartedAt)
+	})
+	return urs, nil
+}
+
+// RunTransaction implements Store.RunTransaction.
+func (fs *FireStore) RunTransaction(ctx context.Context, f func(context.Context, Transaction) error) error {
+	return fs.client.RunTransaction(ctx,
+		func(ctx context.Context, tx *firestore.Transaction) error {
+			return f(ctx, &fsTransaction{fs, tx})
+		})
+}
+
+// cveRecordRef returns a DocumentRef to the CVERecord with id.
+func (s *FireStore) cveRecordRef(id string) *firestore.DocumentRef {
+	return s.nsDoc.Collection(cveCollection).Doc(id)
+}
+
+// fsTransaction implements Transaction
+type fsTransaction struct {
+	s *FireStore
+	t *firestore.Transaction
+}
+
+// CreateCVERecord implements Transaction.CreateCVERecord.
+func (tx *fsTransaction) CreateCVERecord(r *CVERecord) (err error) {
+	defer derrors.Wrap(&err, "FireStore.CreateCVERecord(%s)", r.ID)
+
+	if err := r.Validate(); err != nil {
+		return err
+	}
+	return tx.t.Create(tx.s.cveRecordRef(r.ID), r)
+}
+
+// SetCVERecord implements Transaction.SetCVERecord.
+func (tx *fsTransaction) SetCVERecord(r *CVERecord) (err error) {
+	defer derrors.Wrap(&err, "SetCVERecord(%s)", r.ID)
+
+	if err := r.Validate(); err != nil {
+		return err
+	}
+	return tx.t.Set(tx.s.cveRecordRef(r.ID), r)
+}
+
+// GetCVERecords implements Transaction.GetCVERecords.
+func (tx *fsTransaction) GetCVERecords(startID, endID string) (_ []*CVERecord, err error) {
+	defer derrors.Wrap(&err, "GetCVERecords(%s, %s)", startID, endID)
+
+	q := tx.s.nsDoc.Collection(cveCollection).
+		OrderBy(firestore.DocumentID, firestore.Asc).
+		StartAt(startID).
+		EndAt(endID)
+	iter := tx.t.Documents(q)
+	docsnaps, err := iter.GetAll()
+	if err != nil {
+		return nil, err
+	}
+	var crs []*CVERecord
+	for _, ds := range docsnaps {
+		var cr CVERecord
+		if err := ds.DataTo(&cr); err != nil {
+			return nil, err
+		}
+		crs = append(crs, &cr)
+	}
+	return crs, nil
+}
+
+// Clear removes all documents in the namespace.
+func (s *FireStore) Clear(ctx context.Context) (err error) {
+	defer derrors.Wrap(&err, "Clear")
+
+	collrefs, err := s.nsDoc.Collections(ctx).GetAll()
+	if err != nil {
+		return err
+	}
+	for _, cr := range collrefs {
+		if err := deleteCollection(ctx, s.client, cr, 100); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Copied from https://cloud.google.com/firestore/docs/samples/firestore-data-delete-collection.
+func deleteCollection(ctx context.Context, client *firestore.Client, ref *firestore.CollectionRef, batchSize int) error {
+	for {
+		// Get a batch of documents
+		iter := ref.Limit(batchSize).Documents(ctx)
+		numDeleted := 0
+
+		// Iterate through the documents, adding a delete operation for each one
+		// to a WriteBatch.
+		batch := client.Batch()
+		for {
+			doc, err := iter.Next()
+			if err == iterator.Done {
+				break
+			}
+			if err != nil {
+				return err
+			}
+			batch.Delete(doc.Ref)
+			numDeleted++
+		}
+
+		// If there are no documents to delete, the process is over.
+		if numDeleted == 0 {
+			return nil
+		}
+
+		if _, err := batch.Commit(ctx); err != nil {
+			return err
+		}
+	}
+}
diff --git a/internal/worker/store/fire_store_test.go b/internal/worker/store/fire_store_test.go
new file mode 100644
index 0000000..cbb583e
--- /dev/null
+++ b/internal/worker/store/fire_store_test.go
@@ -0,0 +1,46 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package store
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"math/rand"
+	"os/user"
+	"testing"
+	"time"
+)
+
+var project = flag.String("project", "", "GCP project for Firestore")
+
+func TestFireStore(t *testing.T) {
+	if *project == "" {
+		t.Skip("missing -project")
+	}
+	ctx := context.Background()
+	// Create a client with a unique namespace for this test.
+	username := "unknown"
+	if u, err := user.Current(); err == nil {
+		username = u.Username
+	}
+	rand.Seed(time.Now().UnixNano())
+	r := rand.Intn(1000)
+	namespace := fmt.Sprintf("testing-%s-%d", username, r)
+	t.Logf("testing in namespace %s", namespace)
+
+	fs, err := NewFireStore(ctx, *project, namespace)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Delete the namespace when we're done.
+	defer func() {
+		if err := fs.Clear(ctx); err != nil {
+			t.Log(err)
+		}
+	}()
+
+	testStore(t, fs)
+}