diff --git a/.vscode/launch.json b/.vscode/launch.json
index 9a3abc3..967d3e1 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -24,7 +24,11 @@
                 "${workspaceFolder}/index.js"
             ],
             "env": {
-                "DEBUG": "true"
+                "DEBUG": "true",
+                "KUDOS_BOT_CONFIG": "{'options':{'process_whole_history':true},'slack':{'channel_id':'C8P4F6WTB'},'rules':{'tip_per_kudo_in_usd':0.02,'tip_per_reaction_in_usd':0.001,'reaction_threshold':3},'payments':{'STT':{'network_id':'ropsten','private_key':'0xaaaa','contract_address':'0xc55cF4B03948D7EBc8b9E8BAD92643703811d162'},'SNT':{'network_id':'homestead','private_key':'0xaaaa','contract_address':'0x744d70FDBE2Ba4CF95131626614a1763DF805B9E'}}}",
+                "MEMCACHE_URL": "",
+                "MEMCACHE_USERNAME": "",
+                "MEMCACHE_PASSWORD": ""
             }
         },
         {
diff --git a/lib/slack-profile-cache.js b/lib/slack-profile-cache.js
index 9027560..4559e4d 100644
--- a/lib/slack-profile-cache.js
+++ b/lib/slack-profile-cache.js
@@ -9,13 +9,23 @@
 //   PombeirP
 
 const MemCache = require('mem-cache')
-const fs = require('fs')
+const memjs = require('memjs')
 const { WebClient } = require('@slack/client')
 
 const token = process.env.SLACK_USER_TOKEN || ''
-const cachePath = './slack-cache.json'
+const cacheMemcachedKey = 'slack-profile-cache-json'
 var allowLoadFromCache = true
 
+// Environment variables are defined in app.yaml.
+let MEMCACHE_URL = process.env.MEMCACHE_URL || '127.0.0.1:11211'
+if (process.env.USE_GAE_MEMCACHE) {
+  MEMCACHE_URL = `${process.env.GAE_MEMCACHE_HOST}:${process.env.GAE_MEMCACHE_PORT}`
+}
+const mc = memjs.Client.create(MEMCACHE_URL, {
+  username: process.env.MEMCACHE_USERNAME,
+  password: process.env.MEMCACHE_PASSWORD
+})
+
 module.exports = (robot) => new GitHubSlackIdMapper(robot)
 
 class GitHubSlackIdMapper {
@@ -28,6 +38,15 @@ class GitHubSlackIdMapper {
     setInterval(() => internalBuild(this.robot, this.cache), 24 * 60 * 60 * 1000)
   }
 
+  async getSlackUsernameFromSlackId (slackUserId) {
+    await this.buildPromise
+    const profile = this.cache.get(getSlackId2ProfileCacheKeyName(slackUserId))
+    if (profile) {
+      return profile.name
+    }
+    return null
+  }
+
   async getGitHubHandleFromSlackId (slackUserId) {
     await this.buildPromise
     const profile = this.cache.get(getSlackId2ProfileCacheKeyName(slackUserId))
@@ -54,13 +73,13 @@ class GitHubSlackIdMapper {
 async function internalBuild (robot, cache) {
   if (allowLoadFromCache) {
     try {
-      const json = fs.readFileSync(cachePath)
-      if (json) {
-        const cacheFromFile = JSON.parse(json)
+      const json = await mc.get(cacheMemcachedKey)
+      if (json.value) {
+        const cacheFromFile = JSON.parse(json.value)
         for (const kvp of cacheFromFile) {
           cache.set(kvp.k, kvp.v)
         }
-        robot.log.info(`Read Slack user cache from file (${cache.length} entries)`)
+        robot.log.info(`Read Slack user cache from ${MEMCACHE_URL} (${cache.length} entries)`)
         allowLoadFromCache = false
         return
       }
@@ -100,14 +119,14 @@ async function internalBuild (robot, cache) {
           robot.log.warn(`No GitHub ID field found in @${username} (${user.id}) profile!`)
         }
 
-        const gitHubUsername = gitHubFieldId && profile.fields && profile.fields[gitHubFieldId] ? profile.fields[gitHubFieldId].value : null
+        const gitHubUsername = gitHubFieldId && profile.fields && profile.fields[gitHubFieldId] ? profile.fields[gitHubFieldId].value.replace('https://github.com/', '') : null
         if (gitHubUsername) {
           usersContainingGitHubInfo = usersContainingGitHubInfo.concat(username)
         } else {
           usersMissingGitHubInfo = usersMissingGitHubInfo.concat(username)
         }
 
-        const data = { github_handle: gitHubUsername }
+        const data = { name: username, github_handle: gitHubUsername }
 
         robot.log.debug(`@${username} (${user.id}) -> ${JSON.stringify(data)}`)
 
@@ -144,7 +163,15 @@ async function internalBuild (robot, cache) {
     for (const key of cache.keys) {
       c.push({ k: key, v: cache.get(key) })
     }
-    fs.writeFileSync(cachePath, JSON.stringify(c, null, 2))
+
+    if (mc) {
+      try {
+        await mc.set(cacheMemcachedKey, c, {})
+        robot.log.info(`Saved cache to Memcached`)
+      } catch (error) {
+        robot.log.warn(`Error while saving cache to Memcached: ${error}`)
+      }
+    }
   } catch (e) {
     robot.log.error(`Error while populating Slack user ID cache: ${e}`)
   }
diff --git a/package-lock.json b/package-lock.json
index 408cbe1..ab25eb7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -241,6 +241,7 @@
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.1.0.tgz",
       "integrity": "sha512-KjZwU26uG3u6eZcfGbTULzFcsoz6pegNKtHPksZPOUsiKo5bUmiBPa38FuHZ/Eun+XYh/JCCkS9AS3Lu4McQOQ==",
+      "dev": true,
       "requires": {
         "acorn": "5.3.0"
       }
@@ -431,7 +432,8 @@
     "async-limiter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
-      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
+      "dev": true
     },
     "asynckit": {
       "version": "0.4.0",
@@ -778,7 +780,8 @@
     "browser-process-hrtime": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-0.1.2.tgz",
-      "integrity": "sha1-Ql1opY00R/AqBKqJQYf86K+Le44="
+      "integrity": "sha1-Ql1opY00R/AqBKqJQYf86K+Le44=",
+      "dev": true
     },
     "browser-resolve": {
       "version": "1.11.2",
@@ -1319,52 +1322,15 @@
         "esutils": "2.0.2"
       }
     },
-    "dom-serializer": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.1.0.tgz",
-      "integrity": "sha1-BzxpdUbOB4DOI75KKOKT5AvDDII=",
-      "requires": {
-        "domelementtype": "1.1.3",
-        "entities": "1.1.1"
-      },
-      "dependencies": {
-        "domelementtype": {
-          "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.1.3.tgz",
-          "integrity": "sha1-vSh3PiZCiBrsUVRJJCmcXNgiGFs="
-        }
-      }
-    },
-    "domelementtype": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.0.tgz",
-      "integrity": "sha1-sXrtguirWeUt2cGbF1bg/BhyBMI="
-    },
     "domexception": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/domexception/-/domexception-1.0.1.tgz",
       "integrity": "sha512-raigMkn7CJNNo6Ihro1fzG7wr3fHuYVytzquZKX5n0yizGsTcYgzdIUwj1X9pK0VvjeihV+XiclP+DjwbsSKug==",
+      "dev": true,
       "requires": {
         "webidl-conversions": "4.0.2"
       }
     },
-    "domhandler": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.1.tgz",
-      "integrity": "sha1-iS5HAAqZvlW783dP/qBWHYh5wlk=",
-      "requires": {
-        "domelementtype": "1.3.0"
-      }
-    },
-    "domutils": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.7.0.tgz",
-      "integrity": "sha512-Lgd2XcJ/NjEw+7tFvfKxOzCYKZsdct5lczQ2ZaQY8Djz7pfAD3Gbp8ySJWtreII/vDlMVmxwa6pHmdxIYgttDg==",
-      "requires": {
-        "dom-serializer": "0.1.0",
-        "domelementtype": "1.3.0"
-      }
-    },
     "dotenv": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-4.0.0.tgz",
@@ -1412,11 +1378,6 @@
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.1.tgz",
       "integrity": "sha1-eePVhlU0aQn+bw9Fpd5oEDspTSA="
     },
-    "entities": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.1.tgz",
-      "integrity": "sha1-blwtClYhtdra7O+AuQ7ftc13cvA="
-    },
     "errno": {
       "version": "0.1.6",
       "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.6.tgz",
@@ -2259,6 +2220,795 @@
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
+    "fsevents": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.3.tgz",
+      "integrity": "sha512-WIr7iDkdmdbxu/Gh6eKEZJL6KPE74/5MEsf2whTOFNxbIoIixogroLdKYqB6FDav4Wavh/lZdzzd3b2KxIXC5Q==",
+      "optional": true,
+      "requires": {
+        "nan": "2.8.0",
+        "node-pre-gyp": "0.6.39"
+      },
+      "dependencies": {
+        "abbrev": {
+          "version": "1.1.0",
+          "bundled": true,
+          "optional": true
+        },
+        "ajv": {
+          "version": "4.11.8",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "co": "4.6.0",
+            "json-stable-stringify": "1.0.1"
+          }
+        },
+        "ansi-regex": {
+          "version": "2.1.1",
+          "bundled": true
+        },
+        "aproba": {
+          "version": "1.1.1",
+          "bundled": true,
+          "optional": true
+        },
+        "are-we-there-yet": {
+          "version": "1.1.4",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "delegates": "1.0.0",
+            "readable-stream": "2.2.9"
+          }
+        },
+        "asn1": {
+          "version": "0.2.3",
+          "bundled": true,
+          "optional": true
+        },
+        "assert-plus": {
+          "version": "0.2.0",
+          "bundled": true,
+          "optional": true
+        },
+        "asynckit": {
+          "version": "0.4.0",
+          "bundled": true,
+          "optional": true
+        },
+        "aws-sign2": {
+          "version": "0.6.0",
+          "bundled": true,
+          "optional": true
+        },
+        "aws4": {
+          "version": "1.6.0",
+          "bundled": true,
+          "optional": true
+        },
+        "balanced-match": {
+          "version": "0.4.2",
+          "bundled": true
+        },
+        "bcrypt-pbkdf": {
+          "version": "1.0.1",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "tweetnacl": "0.14.5"
+          }
+        },
+        "block-stream": {
+          "version": "0.0.9",
+          "bundled": true,
+          "requires": {
+            "inherits": "2.0.3"
+          }
+        },
+        "boom": {
+          "version": "2.10.1",
+          "bundled": true,
+          "requires": {
+            "hoek": "2.16.3"
+          }
+        },
+        "brace-expansion": {
+          "version": "1.1.7",
+          "bundled": true,
+          "requires": {
+            "balanced-match": "0.4.2",
+            "concat-map": "0.0.1"
+          }
+        },
+        "buffer-shims": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "caseless": {
+          "version": "0.12.0",
+          "bundled": true,
+          "optional": true
+        },
+        "co": {
+          "version": "4.6.0",
+          "bundled": true,
+          "optional": true
+        },
+        "code-point-at": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "combined-stream": {
+          "version": "1.0.5",
+          "bundled": true,
+          "requires": {
+            "delayed-stream": "1.0.0"
+          }
+        },
+        "concat-map": {
+          "version": "0.0.1",
+          "bundled": true
+        },
+        "console-control-strings": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "core-util-is": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "cryptiles": {
+          "version": "2.0.5",
+          "bundled": true,
+          "requires": {
+            "boom": "2.10.1"
+          }
+        },
+        "dashdash": {
+          "version": "1.14.1",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "assert-plus": "1.0.0"
+          },
+          "dependencies": {
+            "assert-plus": {
+              "version": "1.0.0",
+              "bundled": true,
+              "optional": true
+            }
+          }
+        },
+        "debug": {
+          "version": "2.6.8",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "deep-extend": {
+          "version": "0.4.2",
+          "bundled": true,
+          "optional": true
+        },
+        "delayed-stream": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "delegates": {
+          "version": "1.0.0",
+          "bundled": true,
+          "optional": true
+        },
+        "detect-libc": {
+          "version": "1.0.2",
+          "bundled": true,
+          "optional": true
+        },
+        "ecc-jsbn": {
+          "version": "0.1.1",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "jsbn": "0.1.1"
+          }
+        },
+        "extend": {
+          "version": "3.0.1",
+          "bundled": true,
+          "optional": true
+        },
+        "extsprintf": {
+          "version": "1.0.2",
+          "bundled": true
+        },
+        "forever-agent": {
+          "version": "0.6.1",
+          "bundled": true,
+          "optional": true
+        },
+        "form-data": {
+          "version": "2.1.4",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "asynckit": "0.4.0",
+            "combined-stream": "1.0.5",
+            "mime-types": "2.1.15"
+          }
+        },
+        "fs.realpath": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "fstream": {
+          "version": "1.0.11",
+          "bundled": true,
+          "requires": {
+            "graceful-fs": "4.1.11",
+            "inherits": "2.0.3",
+            "mkdirp": "0.5.1",
+            "rimraf": "2.6.1"
+          }
+        },
+        "fstream-ignore": {
+          "version": "1.0.5",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "fstream": "1.0.11",
+            "inherits": "2.0.3",
+            "minimatch": "3.0.4"
+          }
+        },
+        "gauge": {
+          "version": "2.7.4",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "aproba": "1.1.1",
+            "console-control-strings": "1.1.0",
+            "has-unicode": "2.0.1",
+            "object-assign": "4.1.1",
+            "signal-exit": "3.0.2",
+            "string-width": "1.0.2",
+            "strip-ansi": "3.0.1",
+            "wide-align": "1.1.2"
+          }
+        },
+        "getpass": {
+          "version": "0.1.7",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "assert-plus": "1.0.0"
+          },
+          "dependencies": {
+            "assert-plus": {
+              "version": "1.0.0",
+              "bundled": true,
+              "optional": true
+            }
+          }
+        },
+        "glob": {
+          "version": "7.1.2",
+          "bundled": true,
+          "requires": {
+            "fs.realpath": "1.0.0",
+            "inflight": "1.0.6",
+            "inherits": "2.0.3",
+            "minimatch": "3.0.4",
+            "once": "1.4.0",
+            "path-is-absolute": "1.0.1"
+          }
+        },
+        "graceful-fs": {
+          "version": "4.1.11",
+          "bundled": true
+        },
+        "har-schema": {
+          "version": "1.0.5",
+          "bundled": true,
+          "optional": true
+        },
+        "har-validator": {
+          "version": "4.2.1",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "ajv": "4.11.8",
+            "har-schema": "1.0.5"
+          }
+        },
+        "has-unicode": {
+          "version": "2.0.1",
+          "bundled": true,
+          "optional": true
+        },
+        "hawk": {
+          "version": "3.1.3",
+          "bundled": true,
+          "requires": {
+            "boom": "2.10.1",
+            "cryptiles": "2.0.5",
+            "hoek": "2.16.3",
+            "sntp": "1.0.9"
+          }
+        },
+        "hoek": {
+          "version": "2.16.3",
+          "bundled": true
+        },
+        "http-signature": {
+          "version": "1.1.1",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "assert-plus": "0.2.0",
+            "jsprim": "1.4.0",
+            "sshpk": "1.13.0"
+          }
+        },
+        "inflight": {
+          "version": "1.0.6",
+          "bundled": true,
+          "requires": {
+            "once": "1.4.0",
+            "wrappy": "1.0.2"
+          }
+        },
+        "inherits": {
+          "version": "2.0.3",
+          "bundled": true
+        },
+        "ini": {
+          "version": "1.3.4",
+          "bundled": true,
+          "optional": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "bundled": true,
+          "requires": {
+            "number-is-nan": "1.0.1"
+          }
+        },
+        "is-typedarray": {
+          "version": "1.0.0",
+          "bundled": true,
+          "optional": true
+        },
+        "isarray": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "isstream": {
+          "version": "0.1.2",
+          "bundled": true,
+          "optional": true
+        },
+        "jodid25519": {
+          "version": "1.0.2",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "jsbn": "0.1.1"
+          }
+        },
+        "jsbn": {
+          "version": "0.1.1",
+          "bundled": true,
+          "optional": true
+        },
+        "json-schema": {
+          "version": "0.2.3",
+          "bundled": true,
+          "optional": true
+        },
+        "json-stable-stringify": {
+          "version": "1.0.1",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "jsonify": "0.0.0"
+          }
+        },
+        "json-stringify-safe": {
+          "version": "5.0.1",
+          "bundled": true,
+          "optional": true
+        },
+        "jsonify": {
+          "version": "0.0.0",
+          "bundled": true,
+          "optional": true
+        },
+        "jsprim": {
+          "version": "1.4.0",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "assert-plus": "1.0.0",
+            "extsprintf": "1.0.2",
+            "json-schema": "0.2.3",
+            "verror": "1.3.6"
+          },
+          "dependencies": {
+            "assert-plus": {
+              "version": "1.0.0",
+              "bundled": true,
+              "optional": true
+            }
+          }
+        },
+        "mime-db": {
+          "version": "1.27.0",
+          "bundled": true
+        },
+        "mime-types": {
+          "version": "2.1.15",
+          "bundled": true,
+          "requires": {
+            "mime-db": "1.27.0"
+          }
+        },
+        "minimatch": {
+          "version": "3.0.4",
+          "bundled": true,
+          "requires": {
+            "brace-expansion": "1.1.7"
+          }
+        },
+        "minimist": {
+          "version": "0.0.8",
+          "bundled": true
+        },
+        "mkdirp": {
+          "version": "0.5.1",
+          "bundled": true,
+          "requires": {
+            "minimist": "0.0.8"
+          }
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@@ -6774,6 +7309,7 @@
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       "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
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@@ -6827,6 +7363,7 @@
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+      "dev": true,
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         "tr46": "1.0.1",
@@ -6872,12 +7409,6 @@
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-    "wip-bot": {
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@@ -6963,7 +7494,8 @@
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diff --git a/package.json b/package.json
index d86ca89..ae8746a 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
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     "jenkins": "^0.20.1",
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     "probot": "^5.0.0",
     "probot-config": "^0.1.0",
     "probot-gpg-status": "^0.5.4",