diff --git a/functions/package-lock.json b/functions/package-lock.json
index 72e88f9..77b2dbd 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -54,7 +54,6 @@
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@@ -594,6 +702,11 @@
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@@ -701,6 +824,11 @@
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-          "optional": true,
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@@ -2413,7 +2710,6 @@
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-          "optional": true,
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@@ -2422,7 +2718,6 @@
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-          "optional": true,
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             "xtend": "~4.0.1"
@@ -2497,28 +2792,78 @@
         "send": "0.16.2"
       }
     },
+    "set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
+    },
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       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
       "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ=="
     },
+    "sharp": {
+      "version": "0.22.0",
+      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.22.0.tgz",
+      "integrity": "sha512-yInpiWYvVbE0hJylso2Q2A7QaYFBxGdSlVVHGeUf1F9JsQNAUpmaqdnX54TImgKbSCy9mQpEAoGm1pcKCZhCsQ==",
+      "requires": {
+        "bindings": "^1.5.0",
+        "color": "^3.1.0",
+        "detect-libc": "^1.0.3",
+        "fs-copy-file-sync": "^1.1.1",
+        "nan": "^2.13.1",
+        "npmlog": "^4.1.2",
+        "prebuild-install": "^5.2.5",
+        "semver": "^5.6.0",
+        "simple-get": "^3.0.3",
+        "tar": "^4.4.8",
+        "tunnel-agent": "^0.6.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
+          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA=="
+        }
+      }
+    },
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
-      "optional": true
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
+    },
+    "simple-concat": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.0.tgz",
+      "integrity": "sha1-c0TLuLbib7J9ZrL8hvn21Zl1IcY="
+    },
+    "simple-get": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-3.0.3.tgz",
+      "integrity": "sha512-Wvre/Jq5vgoz31Z9stYWPLn0PqRqmBDpFSdypAnHu5AvRVCYPRYGnvryNLiXu8GOBNDH82J2FRHUGMjjHUpXFw==",
+      "requires": {
+        "decompress-response": "^3.3.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
+    "simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
+      "requires": {
+        "is-arrayish": "^0.3.1"
+      }
     },
     "snakeize": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/snakeize/-/snakeize-0.1.0.tgz",
-      "integrity": "sha1-EMCI2LWOsHazIpu1oE4jLOEmQi0=",
-      "optional": true
+      "integrity": "sha1-EMCI2LWOsHazIpu1oE4jLOEmQi0="
     },
     "split-array-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/split-array-stream/-/split-array-stream-2.0.0.tgz",
       "integrity": "sha512-hmMswlVY91WvGMxs0k8MRgq8zb2mSen4FmDNc5AFiTWtrBpdZN6nwD6kROVe4vNL+ywrvbCKsWVCnEd4riELIg==",
-      "optional": true,
       "requires": {
         "is-stream-ended": "^0.1.4"
       }
@@ -2538,7 +2883,6 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
       "integrity": "sha512-E1GUzBSgvct8Jsb3v2X15pjzN1tYebtbLaMg+eBOUOAxgbLoSbT2NS91ckc5lJD1KfLjId+jXJRgo0qnV5Nerg==",
-      "optional": true,
       "requires": {
         "stubs": "^3.0.0"
       }
@@ -2546,14 +2890,12 @@
     "stream-shift": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/stream-shift/-/stream-shift-1.0.0.tgz",
-      "integrity": "sha1-1cdSgl5TZ+eG944Y5EXqIjoVWVI=",
-      "optional": true
+      "integrity": "sha1-1cdSgl5TZ+eG944Y5EXqIjoVWVI="
     },
     "string-width": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
       "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-      "optional": true,
       "requires": {
         "code-point-at": "^1.0.0",
         "is-fullwidth-code-point": "^1.0.0",
@@ -2574,11 +2916,15 @@
         "ansi-regex": "^2.0.0"
       }
     },
+    "strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
+    },
     "stubs": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
-      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls=",
-      "optional": true
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls="
     },
     "supports-color": {
       "version": "2.0.0",
@@ -2586,11 +2932,89 @@
       "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
       "dev": true
     },
+    "tar": {
+      "version": "4.4.8",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.8.tgz",
+      "integrity": "sha512-LzHF64s5chPQQS0IYBn9IN5h3i98c12bo4NCO7e0sGM2llXQ3p2FGC5sdENN4cTW48O915Sh+x+EXx7XW96xYQ==",
+      "requires": {
+        "chownr": "^1.1.1",
+        "fs-minipass": "^1.2.5",
+        "minipass": "^2.3.4",
+        "minizlib": "^1.1.1",
+        "mkdirp": "^0.5.0",
+        "safe-buffer": "^5.1.2",
+        "yallist": "^3.0.2"
+      }
+    },
+    "tar-fs": {
+      "version": "1.16.3",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-1.16.3.tgz",
+      "integrity": "sha512-NvCeXpYx7OsmOh8zIOP/ebG55zZmxLE0etfWRbWok+q2Qo8x/vOR/IJT1taADXPe+jsiu9axDb3X4B+iIgNlKw==",
+      "requires": {
+        "chownr": "^1.0.1",
+        "mkdirp": "^0.5.1",
+        "pump": "^1.0.0",
+        "tar-stream": "^1.1.2"
+      },
+      "dependencies": {
+        "pump": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/pump/-/pump-1.0.3.tgz",
+          "integrity": "sha512-8k0JupWme55+9tCVE+FS5ULT3K6AbgqrGa58lTT49RpyfwwcGedHqaC5LlQNdEAumn/wFsu6aPwkuPMioy8kqw==",
+          "requires": {
+            "end-of-stream": "^1.1.0",
+            "once": "^1.3.1"
+          }
+        }
+      }
+    },
+    "tar-stream": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
+      "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
+      "requires": {
+        "bl": "^1.0.0",
+        "buffer-alloc": "^1.2.0",
+        "end-of-stream": "^1.0.0",
+        "fs-constants": "^1.0.0",
+        "readable-stream": "^2.3.0",
+        "to-buffer": "^1.1.1",
+        "xtend": "^4.0.0"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+        },
+        "readable-stream": {
+          "version": "2.3.6",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
     "teeny-request": {
       "version": "3.11.3",
       "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-3.11.3.tgz",
       "integrity": "sha512-CKncqSF7sH6p4rzCgkb/z/Pcos5efl0DmolzvlqRQUNcpRIruOhY9+T1FsIlyEbfWd7MsFpodROOwHYh2BaXzw==",
-      "optional": true,
       "requires": {
         "https-proxy-agent": "^2.2.1",
         "node-fetch": "^2.2.0",
@@ -2601,7 +3025,6 @@
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/through2/-/through2-3.0.1.tgz",
       "integrity": "sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==",
-      "optional": true,
       "requires": {
         "readable-stream": "2 || 3"
       },
@@ -2610,7 +3033,6 @@
           "version": "3.3.0",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.3.0.tgz",
           "integrity": "sha512-EsI+s3k3XsW+fU8fQACLN59ky34AZ14LoeVZpYwmZvldCFo0r0gnelwF2TcMjLor/BTL5aDJVBMkss0dthToPw==",
-          "optional": true,
           "requires": {
             "inherits": "^2.0.3",
             "string_decoder": "^1.1.1",
@@ -2621,13 +3043,17 @@
           "version": "1.2.0",
           "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
           "integrity": "sha512-6YqyX6ZWEYguAxgZzHGL7SsCeGx3V2TtOTqZz1xSTSWnqsbWwbptafNyvf/ACquZUXV3DANr5BDIwNYe1mN42w==",
-          "optional": true,
           "requires": {
             "safe-buffer": "~5.1.0"
           }
         }
       }
     },
+    "to-buffer": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
+      "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg=="
+    },
     "tslib": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
@@ -2671,6 +3097,14 @@
         "tslib": "^1.8.1"
       }
     },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "type-is": {
       "version": "1.6.16",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
@@ -2683,8 +3117,7 @@
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
-      "optional": true
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
     "typescript": {
       "version": "3.4.2",
@@ -2696,11 +3129,15 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
       "integrity": "sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=",
-      "optional": true,
       "requires": {
         "crypto-random-string": "^1.0.0"
       }
     },
+    "universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg=="
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -2709,8 +3146,7 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "optional": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "utils-merge": {
       "version": "1.0.1",
@@ -2720,8 +3156,7 @@
     "uuid": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
-      "optional": true
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
     },
     "vary": {
       "version": "1.1.2",
@@ -2748,6 +3183,19 @@
       "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.3.tgz",
       "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg=="
     },
+    "which-pm-runs": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs="
+    },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      }
+    },
     "window-size": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
@@ -2773,7 +3221,6 @@
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
       "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
-      "optional": true,
       "requires": {
         "graceful-fs": "^4.1.11",
         "imurmurhash": "^0.1.4",
@@ -2783,8 +3230,7 @@
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
-      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
-      "optional": true
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ="
     },
     "xmlhttprequest": {
       "version": "1.8.0",
@@ -2805,8 +3251,7 @@
     "yallist": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
-      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
-      "optional": true
+      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A=="
     },
     "yargs": {
       "version": "3.32.0",
diff --git a/functions/package.json b/functions/package.json
index c57d672..214ce6f 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -11,8 +11,13 @@
   },
   "main": "lib/index.js",
   "dependencies": {
+    "@google-cloud/storage": "^2.5.0",
+    "@types/fs-extra": "^5.0.5",
+    "@types/sharp": "^0.22.1",
     "firebase-admin": "~7.0.0",
-    "firebase-functions": "^2.2.0"
+    "firebase-functions": "^2.2.0",
+    "fs-extra": "^7.0.1",
+    "sharp": "^0.22.0"
   },
   "devDependencies": {
     "tslint": "^5.12.0",
diff --git a/functions/src/index.ts b/functions/src/index.ts
index 1f3fc67..e49372c 100644
--- a/functions/src/index.ts
+++ b/functions/src/index.ts
@@ -1,8 +1,50 @@
 import * as functions from 'firebase-functions';
+import { Storage } from '@google-cloud/storage';
 
-// // Start writing Firebase Functions
-// // https://firebase.google.com/docs/functions/typescript
-//
-// export const helloWorld = functions.https.onRequest((request, response) => {
-//  response.send("Hello from Firebase!");
-// });
+const gcs = new Storage();
+
+import { tmpdir } from 'os';
+import { join, dirname } from 'path';
+
+import * as sharp from 'sharp';
+import * as fs from 'fs-extra';
+
+export const generateThumb = functions.storage.object().onFinalize(async object => {
+    // Find the bucket where the uploaded dile resides.
+    const bucket = gcs.bucket(object.bucket);
+    const filePathGcs = object.name;
+    const fileName = filePathGcs!.split('/').pop();
+
+    const bucketDirectory = dirname(filePathGcs!);
+    const workingDirectory = join(tmpdir(), 'thumbnails');
+    const tmpFilePath = join(workingDirectory, 'source.png');
+
+    if (fileName!.includes('thumb@') || !object.contentType!.includes('image')) {
+        console.log('Exiting function');
+        return false;
+    }
+
+    // Ensure that our directory exists.
+    await fs.ensureDir(workingDirectory);
+
+    // Download the source file to the temporary directory.
+    await bucket.file(filePathGcs!).download({
+        destination: tmpFilePath,
+    });
+
+    // Create the thumnail in 124 size.
+    const thumbnailName = `thumb@${fileName}`;
+    const thumbnailLocalPath = join(workingDirectory, thumbnailName);
+
+    await sharp(tmpFilePath)
+        .resize(124, 124)
+        .toFile(thumbnailLocalPath);
+
+    // Upload the resulting thumnail to the same directory as the original file.
+    await bucket.upload(thumbnailLocalPath, {
+        destination: join(bucketDirectory, thumbnailName),
+    });
+
+    // Exit the function deleting all the temprorary files.
+    return fs.remove(workingDirectory);
+});
\ No newline at end of file