diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..4492e53
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,4293 @@
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+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "write-file-atomic": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
+      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
+      "optional": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "xdg-basedir": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ="
+    },
+    "xmlbuilder": {
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.1.tgz",
+      "integrity": "sha1-kc1wiXdVNj66V8Et3uq0o0GmH2U="
+    },
+    "xmlhttprequest": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz",
+      "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw="
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
+    },
+    "yargs": {
+      "version": "3.32.0",
+      "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.32.0.tgz",
+      "integrity": "sha1-AwiOnr+edWtpdRYR0qXvWRSCyZU=",
+      "requires": {
+        "camelcase": "^2.0.1",
+        "cliui": "^3.0.3",
+        "decamelize": "^1.1.1",
+        "os-locale": "^1.4.0",
+        "string-width": "^1.0.1",
+        "window-size": "^0.1.4",
+        "y18n": "^3.2.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..92b0731
--- /dev/null
+++ b/package.json
@@ -0,0 +1,37 @@
+{
+  "name": "tagfer-server",
+  "version": "0.0.0",
+  "description": "Express server hosts the business logic behind tagfer.inc",
+  "main": "server.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mihilmy/tagfer-server.git"
+  },
+  "keywords": [
+    "api"
+  ],
+  "author": "@mihilmy, @oonyeje",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/mihilmy/tagfer-server/issues"
+  },
+  "homepage": "https://github.com/mihilmy/tagfer-server#readme",
+  "dependencies": {
+    "bcrypt": "^3.0.2",
+    "express": "^4.16.4",
+    "firebase": "^5.7.0",
+    "firebase-admin": "^6.4.0",
+    "lodash": "^4.17.11",
+    "lokijs": "^1.5.5",
+    "phone": "^2.3.0",
+    "twilio": "^3.25.0",
+    "uuid": "^3.3.2"
+  },
+  "devDependencies": {
+    "eslint": "^5.9.0",
+    "faker": "^4.1.0"
+  }
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..d1a19d5
--- /dev/null
+++ b/server.js
@@ -0,0 +1,14 @@
+require('./src/config/firebase');
+
+const express = require('express');
+const appConfig = require('./src/config/app.json');
+const router = require('./src/config/router');
+
+const app = express();
+
+app.use(express.json());
+
+router(app);
+
+// eslint-disable-next-line no-console
+app.listen(appConfig.server.port, () => console.log('Listening on port 3000!'));
\ No newline at end of file
diff --git a/src/config/app.json b/src/config/app.json
new file mode 100644
index 0000000..10074dc
--- /dev/null
+++ b/src/config/app.json
@@ -0,0 +1,41 @@
+{
+  "server": {
+    "port": 3000
+  },
+  "keys": {
+    "appSecret": "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJujjNO60eZu3GUU+1Tx9ruhVzlbjlpfZlvROONBqwj6jOgd86dTPtbfvBZO7dKlwiIikLJNP6tpFeNohxO6EcsCAwEAAQ",
+    "firebaseAdmin": {
+      "type": "service_account",
+      "project_id": "tagfer-inc",
+      "private_key_id": "bd5a13081cb521ea1b43f374d3bdc1f09b13ef99",
+      "private_key": "-----BEGIN PRIVATE KEY-----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\neFGb6qu0ZoT7vaEt4rSA2iLpPw==\n-----END PRIVATE KEY-----\n",
+      "client_email": "firebase-adminsdk-tcgaf@tagfer-inc.iam.gserviceaccount.com",
+      "client_id": "112076836493715153722",
+      "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+      "token_uri": "https://oauth2.googleapis.com/token",
+      "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+      "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-tcgaf%40tagfer-inc.iam.gserviceaccount.com"
+    },
+    "firebase": {
+      "apiKey": "AIzaSyCtyieRAu2Vl_0i9KvnD8aYfAqFGUnWDkY",
+      "authDomain": "tagfer-inc.firebaseapp.com",
+      "databaseURL": "https://tagfer-inc.firebaseio.com",
+      "projectId": "tagfer-inc",
+      "storageBucket": "tagfer-inc.appspot.com",
+      "messagingSenderId": "497562483601"
+    },
+    "twilio": {
+      "accountSid": "ACf62469621684ed007c01dfc9aa0923fa",
+      "authToken": "62bbc8dc0bd42503dcc46eb17fb26895", 
+      "phoneNumber": "+17027108370 "
+    }
+  },
+  "dbPath": {
+    "users": "users"
+  },
+  "loki" : {
+    "verificationTTL": 300000,
+    "verificationTTLClear": 1800000
+  }
+  
+}
\ No newline at end of file
diff --git a/src/config/errors.js b/src/config/errors.js
new file mode 100644
index 0000000..8b661f3
--- /dev/null
+++ b/src/config/errors.js
@@ -0,0 +1,15 @@
+module.exports = {
+  AUTH_INVALID_EMAIL: 'auth/invalid-email',
+  AUTH_INVALID_PHONE_NUMBER: 'auth/invalid-phone-number',
+  AUTH_USER_NOT_FOUND: 'auth/user-not-found',
+  AUTH_WRONG_PASSWORD: 'auth/wrong-password',
+  AUTH_UID_ALREADY_EXISTS: 'auth/uid-already-exists',
+  AUTH_EMAIL_ALREADY_EXISTS: 'auth/email-already-exists',
+  AUTH_PHONE_ALREADY_EXISTS: 'auth/phone-number-already-exists',
+  AUTH_PHONE_NOT_CACHED: 'auth/phone-number-not-cached',
+  AUTH_VERIFICATION_CODE_MISMATCH: 'auth/phone-verification-code-mismatch',
+  APP_NETWORK_ERROR: 'app/network-error', 
+  APP_NETWORK_TIMEOUT: 'app/network-timeout',
+  APP_UNABLE_TO_PARSE_RESPONSE: 'app/unable-to-parse-response',
+  MISSING_BODY_ATTRIBUTES: 'request/missing-body-attributes'
+};
\ No newline at end of file
diff --git a/src/config/firebase.js b/src/config/firebase.js
new file mode 100644
index 0000000..9b9ee3e
--- /dev/null
+++ b/src/config/firebase.js
@@ -0,0 +1,11 @@
+const admin = require('firebase-admin');
+const firebase = require('firebase');
+
+const appConfig = require('./app.json');
+
+admin.initializeApp({
+  credential: admin.credential.cert(appConfig.keys.firebaseAdmin),
+  databaseURL: appConfig.keys.firebase.databaseURL
+});
+
+firebase.initializeApp(appConfig.keys.firebase);
\ No newline at end of file
diff --git a/src/config/http.js b/src/config/http.js
new file mode 100644
index 0000000..9df84ac
--- /dev/null
+++ b/src/config/http.js
@@ -0,0 +1,8 @@
+module.exports = {
+  OK: 200,
+  CREATED: 201,
+  BAD_REQUEST: 400,
+  UNAUTHORIZED: 401,
+  FORBIDDEN: 403,
+  INTERNAL_SERVER_ERROR: 500
+};
\ No newline at end of file
diff --git a/src/config/loki.js b/src/config/loki.js
new file mode 100644
index 0000000..ce7c6a4
--- /dev/null
+++ b/src/config/loki.js
@@ -0,0 +1,27 @@
+const Loki = require('lokijs');
+
+const appConfig = require('./app.json');
+
+const loki = new Loki('store.json', { autosave: true, autoload: true, autoloadCallback: lokiInit });
+
+/**
+ * Initializes the collections in our local loki
+ */
+function lokiInit() {
+  let sessions = loki.getCollection('sessions');
+  let verifications = loki.getCollection('verifications');
+
+  if (sessions == null) {
+    sessions = loki.addCollection('sessions', { unique: ['id'] });
+  }
+
+  if(verifications == null) {
+    verifications = loki.addCollection('verifications', {
+      unique: ['phoneNumber'], 
+      ttl: appConfig.loki.verificationTTL,
+      ttlInterval: appConfig.loki.verificationTTLClear
+    });
+  }
+}
+
+module.exports = loki;
\ No newline at end of file
diff --git a/src/config/router.js b/src/config/router.js
new file mode 100644
index 0000000..a752fa8
--- /dev/null
+++ b/src/config/router.js
@@ -0,0 +1,21 @@
+const AuthHandlers = require('../ups/auth/handlers');
+const UserHandlers = require('../ups/users/handlers');
+
+/**
+ * Main router for our application, include all routes here. No logic should be added in this file.
+ * @param {Express} app 
+ */
+function router(app) {
+  // Auth Endpoints
+  app.get('/auth/email/:email/exists', AuthHandlers.doesAttributeExist );
+  app.get('/auth/tagferId/:tagferId/exists', AuthHandlers.doesAttributeExist );
+  app.post('/auth/phone/code', AuthHandlers.sendPhoneCode);
+  app.post('/auth/phone/verify', AuthHandlers.verifyPhoneCode);
+  app.post('/auth/signin', AuthHandlers.signin);
+  app.put('/auth/signup', AuthHandlers.signup);
+
+  // Users Endpoints
+  app.get('/users/by/phone', UserHandlers.findNetworkByPhone);
+}
+
+module.exports = router;
\ No newline at end of file
diff --git a/src/config/twilio.js b/src/config/twilio.js
new file mode 100644
index 0000000..7095599
--- /dev/null
+++ b/src/config/twilio.js
@@ -0,0 +1,30 @@
+const Twilio = require('twilio');
+
+const appConfig = require('./app.json');
+
+const authToken  = appConfig.keys.twilio.authToken;
+const accountSid = appConfig.keys.twilio.accountSid;
+const tagferPhone = appConfig.keys.twilio.phoneNumber;
+const client = new Twilio(accountSid, authToken);
+
+/**
+ * 
+ */
+function sendSMSTo(clientPhone, message, callback) {
+  const sms = {
+    from: tagferPhone,
+    body: message,
+    to: clientPhone
+  };
+
+  client.messages.create(sms).then(() => {
+    callback({result: true});
+  }).catch(error => {
+    //TODO: add twilio error handler
+    callback({error: error.message});
+  }).done();
+}
+
+module.exports = {
+  sendSMSTo
+};
\ No newline at end of file
diff --git a/src/ups/auth/dao.js b/src/ups/auth/dao.js
new file mode 100644
index 0000000..6a15481
--- /dev/null
+++ b/src/ups/auth/dao.js
@@ -0,0 +1,173 @@
+const firebase = require('firebase');
+const admin = require('firebase-admin');
+const uuid = require('uuid/v4');
+const _ = require('lodash');
+
+const errors = require('../../config/errors');
+const loki = require('../../config/loki');
+const twilio = require('../../config/twilio');
+
+/**
+ * Checks if the email exists in our auth system
+ */
+function doesEmailExist(email) {
+  return _doesKeyValueExist({email});
+}
+
+/**
+ * Checks if the tagferId exists in our auth system
+ */
+function doesTagferIdExist(tagferId) {
+  return _doesKeyValueExist({tagferId});
+}
+
+/**
+ * Checks if the phone number exists in our auth system
+ */
+function doesPhoneExist(phoneNumber) {
+  return _doesKeyValueExist({phoneNumber});
+}
+
+/**
+ * Sign in user using firebase client api
+ * @param {String} email 
+ * @param {String} password 
+ */
+function signinWithEmail(email, password) {
+  return firebase.auth().signInWithEmailAndPassword(email, password);
+}
+
+/**
+ * Sign in with tagferId using the admin sdk to get email and then the firebase client to sign in
+ * @param {String} tagferId 
+ * @param {String} password 
+ */
+function signinWithTagferId(tagferId, password) {
+  return admin.auth().getUser(tagferId).then(user => signinWithEmail(user.email, password) );
+}
+
+/**
+ * Creates a new user in firebase auth
+ * @param {Object} user 
+ * @param {Function} callback 
+ */
+function createNewUser(user) {
+  return admin.auth().createUser({
+    uid: user.tagferId.toLowerCase(),
+    email: user.email,
+    password: user.password,
+    phoneNumber: user.phoneNumber,
+    displayName: _.startCase(user.fullName)
+  });
+}
+
+/**
+ * 
+ * @param {string} phone 
+ * @param {number} usrCode 
+ */
+function isVerificationCodeCorrect(phoneNumber, usrCode) {
+  try {
+    const sysCode = getVerificationCode(phoneNumber);
+    return {result: usrCode == sysCode};
+  } catch (error) {
+    return {error};
+  }
+}
+
+/**
+ * Sends the verification code by calling twilio and saving the code to our local storgae
+ * @param {string} phoneNumber 
+ * @param {function} callback 
+ */
+function sendVerificationCode(phoneNumber, callback) {
+  const code = createNewVerificationCode(phoneNumber);
+  const message = `Tagfer PIN: ${code}`;
+  twilio.sendSMSTo(phoneNumber, message, callback);
+}
+
+/**
+ * Creates a new session for security of users and to maintain states of the requests.
+ * @returns Session identifier to manage state of the user
+ */
+function createNewSessionId(tagferId) {
+  const sessionId = uuid();
+  const sessions  = loki.getCollection('sessions');
+  sessions.insert({ id: sessionId, tagferId });
+
+  return sessionId;
+}
+
+/**
+ * Create new verification code for the phone number
+ */
+function createNewVerificationCode(phoneNumber) {
+  const code = Math.floor(((Math.random() * 899999) + 100000));
+  const verifications = loki.getCollection('verifications');
+
+  try {
+    verifications.insert({ phoneNumber, code });
+  } catch (error){
+    const record = verifications.by('phoneNumber', phoneNumber);
+    record.code = code;
+    verifications.update(record);
+  }
+
+  return code;
+}
+
+/**
+ * Gets the verification code from loki by phone number
+ * @param {string} phoneNumber phone number
+ */
+function getVerificationCode(phoneNumber) {
+  const verifications = loki.getCollection('verifications');
+  
+  const record = verifications.by('phoneNumber', phoneNumber);
+  if (!record) {
+    throw errors.AUTH_PHONE_NOT_CACHED;
+  }
+
+  return record.code; 
+}
+
+function _doesKeyValueExist({email, tagferId, phoneNumber}) {
+  let promise;
+
+  if (email) { promise = admin.auth().getUserByEmail(email); }
+  if (tagferId) { promise = admin.auth().getUser(tagferId.toLowerCase());}
+  if (phoneNumber) {promise = admin.auth().getUserByPhoneNumber(phoneNumber); }
+  
+  return promise.then(() => { return true; })
+    .catch(error => { 
+      if (error.code === errors.AUTH_USER_NOT_FOUND) {  
+        return false; 
+      } else {
+        throw { error: error.code };
+      }
+    });
+}
+
+module.exports = {
+  doesEmailExist,
+  doesTagferIdExist,
+  doesPhoneExist,
+  sendVerificationCode,
+  isVerificationCodeCorrect,
+  signinWithTagferId,
+  signinWithEmail,
+  createNewUser,
+  createNewSessionId
+};
+
+// function signinWithTagferId1(tagferId, password, callback) {
+//   const path = `users/${tagferId}/hash`;
+
+//   db.ref(path).once('value').then( data => {
+//     if(!data.exists()) {
+//       callback({error: errors.AUTH_USER_NOT_FOUND});
+//     }
+//     const hash = data.val();
+//     bcrypt.compare(password, hash).then(result => callback({result}));
+//   });
+// }
\ No newline at end of file
diff --git a/src/ups/auth/handlers.js b/src/ups/auth/handlers.js
new file mode 100644
index 0000000..2130cb5
--- /dev/null
+++ b/src/ups/auth/handlers.js
@@ -0,0 +1,116 @@
+const dao = require('./dao');
+const utils = require('../utils/utils');
+const errors =  require('../../config/errors');
+
+// Handlers
+/**
+ * Endpoints: auth/email/:email/exists or auth/tagferId/:tagferId/exists
+ * Extracts the parameter from the request and calls the appropriate function to check if the attribute exists.
+ * @param {Object} req 
+ * @param {Object} res {result: Boolean} | {error: String}
+ */
+function doesAttributeExist(req, res) {
+  const { email, tagferId } = req.params;
+  if (!utils.isAppSecretValid(req,res)) {
+    return;
+  }
+  var promise = email? dao.doesEmailExist(email) : dao.doesTagferIdExist(tagferId.toLowerCase());
+
+  promise.then((result) => res.json({ result }) ).catch(error => res.json(error));
+}
+
+/**
+ * Handles the request/response for auth/phone/code. Uses the data layer to generate a unique code,
+ * if the phone number is not in our system.
+ * @param {Object} req request body contains number
+ * @param {Object} res {code: String} | {error: String}
+ */
+function sendPhoneCode(req, res) {
+  const verifier = () => req.body.phoneNumber;
+  if (!utils.isAppSecretValid(req,res) || !utils.isBodyValid(verifier, res)) {
+    return;
+  }
+
+  const phoneNumber = req.body.phoneNumber;
+  dao.doesPhoneExist(phoneNumber).then( result => { 
+    if (result === false) { 
+      dao.sendVerificationCode(phoneNumber, status => res.json(status)); 
+    } else{ 
+      throw { error: errors.AUTH_PHONE_ALREADY_EXISTS };
+    }
+  }).catch( error => res.json(error) );
+}
+
+/**
+ * Handles the request/response for auth/phone/verify. Uses the data layer to verify that the code is correct.
+ * @param {Object} req request is a json that has both attributes { phone, code }
+ * @param {Object} res express request object
+ */
+function verifyPhoneCode(req, res) {
+  const verifier = () => req.body.phoneNumber && req.body.code;
+  if (!utils.isAppSecretValid(req,res) || !utils.isBodyValid(verifier, res)) {
+    return;
+  }
+
+  const phoneNumber = req.body.phoneNumber;
+  const code  = req.body.code;
+  res.json(dao.isVerificationCodeCorrect(phoneNumber, code));
+}
+
+/**
+ * Endpoint: auth/signin
+ * Signs the user in using firebase auth
+ * @param {Object} req {email: String, password: String} | {tagferId: String, password: String}
+ * @param {Object} res {sessionId: String} | {error: String}
+ */
+function signin(req, res) {
+  const { email, tagferId, password } = req.body;
+  const verifier = () => (email || tagferId) && password;
+  if (!utils.isAppSecretValid(req,res) || !utils.isBodyValid(verifier, res)) {
+    return;
+  }
+
+  var promise;
+
+  if (email) {
+    promise = dao.signinWithEmail(email, password);
+  } else {
+    promise = dao.signinWithTagferId(tagferId, password);
+  }
+
+  promise.then( ({ user })=> {
+    const sessionId = dao.createNewSessionId(user.uid);
+    res.json({sessionId});
+  }).catch(error => {
+    res.json( {error: error.code} );
+  });
+}
+
+/**
+ * Endpoint: auth/signup
+ * Signs up the user by creating a new user in firebase admin.
+ * @param {Object} req { tagferId: String, email: String, password: String, phoneNumber: String, fullName: String }
+ * @param {Object} res { sessionId: String } | { error: String }
+ */
+function signup(req, res) {
+  const user = req.body;
+  const verifier = () => user.tagferId && user.email && user.password && user.phoneNumber && user.fullName;
+  if (!utils.isAppSecretValid(req,res) || !utils.isBodyValid(verifier, res)) {
+    return;
+  }
+
+  dao.createNewUser(user).then( user => {
+    const sessionId = dao.createNewSessionId(user.uid);
+    res.json({sessionId});
+  }).catch(error => {
+    res.json( {error: error.code} );
+  });
+}
+
+module.exports = {
+  doesAttributeExist,
+  sendPhoneCode,
+  verifyPhoneCode,
+  signin,
+  signup
+};
\ No newline at end of file
diff --git a/src/ups/users/dao.js b/src/ups/users/dao.js
new file mode 100644
index 0000000..f7270c6
--- /dev/null
+++ b/src/ups/users/dao.js
@@ -0,0 +1,47 @@
+const admin = require('firebase-admin');
+
+const errors = require('../../config/errors');
+
+/**
+ * Filters contacts into three batches:
+ * 1. Contacts that are in the tagfer network.
+ * 2. Contacts that are out of the network.
+ * 3. Contacts that failed to be processed.
+ * @param {Array} contacts 
+ * @returns {Object} groups inNetwork, outNetwork, failedBatch
+ */
+async function filterContactsIntoBatches(contacts) {
+  const promises = [];
+  const inNetworkBatch = [];
+  const outNetworkBatch = [];
+  const failedBatch = [];
+
+  const addToBatch = (contact) => contact.inNetwork? inNetworkBatch.push(contact.tagferId) : contact.outNetwork? outNetworkBatch.push(contact.phoneNumber) : failedBatch.push(contact.phoneNumber);
+  
+  for (let i = 0; i < contacts.length; i++) {
+    if (contacts[i]) {
+      promises.push(_getContactStatus(contacts[i]));
+    }
+  }
+
+  const results = await Promise.all(promises);
+  
+  for(let i = 0; i < results.length; i++) {
+    if (results[i])
+      addToBatch(results[i]);
+  }
+
+  return {inNetworkBatch, outNetworkBatch, failedBatch};
+}
+
+function _getContactStatus(phoneNumber) {
+  return admin.auth().getUserByPhoneNumber(phoneNumber).then( user => {
+    return {inNetwork: true, tagferId: user.uid}; 
+  }).catch( error => {
+    return error === errors.AUTH_USER_NOT_FOUND ? { outNetwork: true, phoneNumber } : { error: error.code, phoneNumber};
+  });
+}
+
+module.exports = {
+  filterContactsIntoBatches
+};
\ No newline at end of file
diff --git a/src/ups/users/handlers.js b/src/ups/users/handlers.js
new file mode 100644
index 0000000..52ce538
--- /dev/null
+++ b/src/ups/users/handlers.js
@@ -0,0 +1,26 @@
+const phone = require('phone');
+
+const dao = require('./dao');
+const utils = require('../utils/utils');
+
+/**
+ * Endpoint: users/by/phone
+ * Seperates the phone numbers into batches in/out of Tagfer network, receiver should use this information to either
+ * add people who already in network, or send invites or repeat calls for failed batches.
+ * @param {Object} req {contacts: Array<PhoneNumber>}
+ * @param {Object} res {inNetworkBatch : Array<PhoneNumber>, outNetworkBatch: Array<PhoneNumber>, failedBatch: Array<PhoneNumber> }
+ */
+async function findNetworkByPhone(req, res) {
+  const contacts = req.body.contacts;
+  const verifier = () => contacts && Array.isArray(contacts);
+  if (!utils.isAppSecretValid(req,res) || !utils.isBodyValid(verifier, res)) {
+    return;
+  }
+
+  const batches = await dao.filterContactsIntoBatches(contacts.map((number) => phone(number)[0]));
+  res.json(batches);
+}
+
+module.exports = {
+  findNetworkByPhone
+};
diff --git a/src/ups/utils/utils.js b/src/ups/utils/utils.js
new file mode 100644
index 0000000..3e14f3d
--- /dev/null
+++ b/src/ups/utils/utils.js
@@ -0,0 +1,38 @@
+const appConfig =  require('../../config/app.json');
+const http =  require('../../config/http');
+const errors =  require('../../config/errors');
+
+/**
+ * Verifies if the request is valid by checking if the request has the right app secret.
+ * @param {Object} req express request object
+ * @param {Object} res express response object
+ * @returns true if the app secret is valid and false otherwise
+ */
+function isAppSecretValid(req, res) {
+  const usrToken = req.headers.authorization;
+  const sysToken = appConfig.keys.appSecret;
+
+  if( usrToken !== sysToken) {
+    res.status(http.UNAUTHORIZED).json({ error: 'Unauthorized access into api' });
+    return false;
+  }
+
+  return true;  
+}
+/**
+ * Checks if the body is valid
+ * @param {Function} isValid verifier 
+ */
+function isBodyValid(isValid, response) {
+  if (!isValid()) {
+    response.status(http.BAD_REQUEST).json({error: errors.MISSING_BODY_ATTRIBUTES});
+    return false;
+  }
+
+  return true;
+} 
+
+module.exports = {
+  isAppSecretValid,
+  isBodyValid
+};
\ No newline at end of file