diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..79f21cc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+juggl/config/config.txt
+juggl/config/config.path
diff --git a/juggl/config/config.path.sample b/juggl/config/config.path.sample
new file mode 100644
index 0000000..35b61a7
--- /dev/null
+++ b/juggl/config/config.path.sample
@@ -0,0 +1 @@
+relativepath=config/config.txt
\ No newline at end of file
diff --git a/juggl/config/config.txt.sample b/juggl/config/config.txt.sample
new file mode 100644
index 0000000..b102c26
--- /dev/null
+++ b/juggl/config/config.txt.sample
@@ -0,0 +1,4 @@
+host=HOST
+dbname=DBNAME
+username=USERNAME
+password=PASSWORD
\ No newline at end of file
diff --git a/juggl/services/apiBranch.inc.php b/juggl/services/apiBranch.inc.php
new file mode 100644
index 0000000..62601e9
--- /dev/null
+++ b/juggl/services/apiBranch.inc.php
@@ -0,0 +1,38 @@
+<?php
+require_once(__DIR__."/authenticator.inc.php");
+require_once(__DIR__."/responses.inc.php");
+require_once(__DIR__."/requestTypes.inc.php");
+require_once(__DIR__."/dbOperations.inc.php");
+require_once(__DIR__."/paramCleaner.inc.php");
+
+abstract class ApiBranch {
+    function get (ParamCleaner $params) {}
+    function post (ParamCleaner $params) {}
+    function authenticationMissing (ParamCleaner $params) {
+        respondStatus(403);
+    }
+
+    function execute ($authenticationRequired = true) {
+        if ($authenticationRequired) {
+            $auth = new Authenticator();
+            if (!$auth->isAuthenticated($_SESSION, $_REQUEST)) {
+                $this->authenticationMissing($this->getParams());
+                return;
+            }
+        }
+
+        $currentType = currentRequestType();
+        if($currentType === RequestType::GET) {
+            $this->get($this->getParams());
+        } else if ($currentType === RequestType::POST) {
+            $this->post($this->getParams());
+        }
+    }
+
+    private function getParams() {
+        $content = json_decode(file_get_contents('php://input'), true);
+        $contentArray = array("json" => $content);
+        return new ParamCleaner(array_merge($contentArray, $_REQUEST, $_SESSION, $_FILES));
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/authenticator.inc.php b/juggl/services/authenticator.inc.php
new file mode 100644
index 0000000..8cb07d9
--- /dev/null
+++ b/juggl/services/authenticator.inc.php
@@ -0,0 +1,43 @@
+<?php
+require(__DIR__."/dbOperations.inc.php");
+    
+class Authenticator {
+    function isApiKeyAuthenticated($key) {
+        $db = new DbOperations();
+        $db->select("api_keys", array("quota_max", "client_key"));
+        $db->where("client_key", Comparison::EQUAL, $key);
+        
+        $result = $db->execute();
+        
+        if (count($result) == 1 && $result[0]['quota_max'] > 0)
+            return true;
+        else
+            return false;
+    }
+
+    function isSessionAuthenticated($session) {
+        if (isset($session['stayloggedin'])) {
+            if($session["stayloggedin"]) {
+                return true;
+            }
+        }
+
+        if (!isset($session['until'])) {
+            return false;
+        }
+            
+        if ($session['until'] > time() || $session['until'] == 0)
+            return true;
+        else
+            return false;
+    }
+
+    function isAuthenticated($session, $request) {
+        if (isset($request['key'])) {
+            return $this->isApiKeyAuthenticated($request['key']);
+        } else {
+            return $this->isSessionAuthenticated($session);
+        }
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/basicEnum.inc.php b/juggl/services/basicEnum.inc.php
new file mode 100644
index 0000000..5805eea
--- /dev/null
+++ b/juggl/services/basicEnum.inc.php
@@ -0,0 +1,33 @@
+<?php
+abstract class BasicEnum {
+    private static $constCacheArray = NULL;
+
+    private static function getConstants() {
+        if (self::$constCacheArray == NULL) {
+            self::$constCacheArray = [];
+        }
+        $calledClass = get_called_class();
+        if (!array_key_exists($calledClass, self::$constCacheArray)) {
+            $reflect = new ReflectionClass($calledClass);
+            self::$constCacheArray[$calledClass] = $reflect->getConstants();
+        }
+        return self::$constCacheArray[$calledClass];
+    }
+
+    public static function isValidName($name, $strict = false) {
+        $constants = self::getConstants();
+
+        if ($strict) {
+            return array_key_exists($name, $constants);
+        }
+
+        $keys = array_map('strtolower', array_keys($constants));
+        return in_array(strtolower($name), $keys);
+    }
+
+    public static function isValidValue($value, $strict = true) {
+        $values = array_values(self::getConstants());
+        return in_array($value, $values, $strict);
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/configReader.inc.php b/juggl/services/configReader.inc.php
new file mode 100644
index 0000000..c9bcd69
--- /dev/null
+++ b/juggl/services/configReader.inc.php
@@ -0,0 +1,45 @@
+<?php
+
+class ConfigReader {
+    private const VALUE_SEPARATOR = '=';
+
+    function readFile ($path) {
+        if (file_exists($path) == false)
+            return;
+
+        $this->configuration = array();
+        foreach (file($path) as $line) {
+            $valuePair = $this->convertLine(trim($line));
+
+            if ($valuePair === false)
+                continue;
+                $this->configuration[$valuePair['key']] = $valuePair['value'];
+            }
+    }
+
+    function getSetting ($key) {
+        if (array_key_exists($key, $this->configuration) == false)
+            return NULL;
+        
+        return $this->configuration[$key];
+    }
+
+    private function convertLine($line) {
+        if ($line == "")
+            return False;
+        
+        $splitted = explode (self::VALUE_SEPARATOR, $line, 2);
+        $key = $splitted[0];
+        
+        $value = "";
+        for ($i = 1; $i < sizeof($splitted); $i++) {
+            if ($i > 1) {
+                $value .= "=";
+            }
+            $value .= $splitted[$i];
+        }
+
+        return ['key' => $key, 'value' => $value];
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/dbOperations.inc.php b/juggl/services/dbOperations.inc.php
new file mode 100644
index 0000000..e73ecb9
--- /dev/null
+++ b/juggl/services/dbOperations.inc.php
@@ -0,0 +1,190 @@
+<?php
+require(__DIR__."/configReader.inc.php");
+require(__DIR__."/basicEnum.inc.php");
+
+class DbOperations {
+    function __construct () {
+        $this->resetQuery();
+    }
+
+    function resetQuery() {
+        $this->query = "";
+        $this->data = array();
+        $this->table = "";
+    }
+
+    private function openConnection () {
+        $config = new ConfigReader();
+        $config->readFile(__DIR__."/../config/config.path");
+        $config->readFile(__DIR__."/../".$config->getSetting("relativepath"));
+        
+        $host = $config->getSetting('host');
+        $dbname = $config->getSetting('dbname');
+        $dsn = "mysql:host=$host;dbname=$dbname";
+
+        $options = array(PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC);
+        
+        $this->pdo = new PDO($dsn, $config->getSetting('username'), $config->getSetting('password'), $options);
+    }
+    
+    function select (string $table, array $attributes = array()) {
+        $this->table = $table;
+        if (count($attributes) == 0)
+            $formattedAttributes = "*";
+        else {
+            for($i = 0; $i < count($attributes); $i++){
+                $a = $attributes[$i];
+                if (strpos($a, ".") === false) {
+                    $attributes[$i] = "$this->table.$a";
+                }
+            }
+            $formattedAttributes = implode(', ', $attributes);
+        }
+
+        $this->addToQuery("SELECT $formattedAttributes FROM $table");
+
+        return $this;
+    }
+    
+    
+    function orderBy (string $attribute, string $order = Order::ASC) {
+        $this->addToQuery("ORDER BY $attribute $order");
+
+        return $this;
+    }
+    
+    static function getLatestIdInTable (string $table, string $attribute = "id") {
+        $db = new DbOperations();
+        $db->select($table, array($attribute));
+        $db->orderBy($attribute, Order::DESC);
+
+        return $db->execute()[0][$attribute];
+    }
+    
+    function insert (string $table, array $data) {
+        $this->table = $table;
+        
+        $attributes = implode(", ", array_keys($data));
+        $valuesIds = array();
+        foreach($data as $attribute => $value) {
+            $valuesIds[] = $this->addData($value, $attribute);
+        }
+        $values = implode(" , ", $valuesIds);
+
+        $this->addToQuery("INSERT INTO $table ( $attributes ) VALUES ( $values )");
+
+        return $this;
+    }
+    
+    function update (string $table, array $data) {
+        $this->table = $table;
+        
+        $sets = array();
+        foreach($data as $attribute => $value) {
+            $valueId = $this->addData($value, $attribute);
+            $sets[] = "$attribute = $valueId";
+        }
+        $setString = implode(", ", $sets);
+
+        $this->addToQuery("UPDATE $table SET $setString");
+
+        return $this;
+    }
+    
+    function delete (string $table) {
+        $this->table = $table;
+
+        $this->addToQuery("DELETE FROM $table");
+
+        return $this;
+    }
+
+    private function addToQuery (string $phrase) {
+        $delimeter = " ";
+        $this->query = implode($delimeter, array($this->query, $phrase));
+    }
+    
+    function where (string $attribute, string $comparison, $value, string $connector = Combination::AND) {
+        if (Comparison::isValidValue($comparison) == false)
+            return;
+        
+        $keyWord = "WHERE";
+        if (!(strpos($this->query, $keyWord) === false))
+            $keyWord = $connector;
+
+        $valueId = $this->addData($value, $attribute);
+        $this->addToQuery("$keyWord $attribute $comparison $valueId");
+
+        return $this;
+    }
+
+    function innerJoin (string $table, string $externAttribute, string $internAttribute, string $internTable = "") {
+        if ($internTable === "") {
+            $internTable = $this->table;
+        }
+
+        $innerJoin = "INNER JOIN $table ON $table.$externAttribute = $internTable.$internAttribute";
+
+        $this->addToQuery($innerJoin);
+
+        return $this;
+    }
+
+    private function addData($data, $attribute) {
+        $name = str_replace(".", "", $attribute);
+
+        $this->data[$name] = $data;
+        return ":".$name;
+    }
+
+    function execute() {
+        try{
+            $this->openConnection();
+    
+            $pdoQuery = $this->pdo->prepare($this->query);
+            $pdoQuery->execute($this->data);
+    
+            $results = array();
+            while($row = $pdoQuery->fetch()) {
+                $results[] = $row;
+            }
+    
+            $this->resetQuery();
+            
+            return $results;
+        } catch (PDOException $e) {
+            // TODO: Hide errors from user and log them
+            print($e);
+            return array();
+        }
+    }
+
+    function sql(string $sqlStatement, array $data) {
+        $this->query = $sqlStatement;
+        
+        foreach($data as $attribute => $value) {
+            $this->addData($value, $attribute);
+        }
+    }
+}
+
+abstract class Comparison extends BasicEnum {
+    const EQUAL = "=";
+    const GREATER_THAN = ">";
+    const GREATER_THAN_OR_EQUAL = ">=";
+    const LESS_THAN = "<";
+    const LESS_THAN_OR_EQUAL = "<=";
+    const UNEQUAL = "!=";
+    const LIKE = "LIKE";
+}
+
+abstract class Combination extends BasicEnum {
+    const AND = "AND";
+    const OR = "OR";
+}
+
+abstract class Order extends BasicEnum {
+    const ASC = "ASC";
+    const DESC = "DESC";
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/jsonBuilder.inc.php b/juggl/services/jsonBuilder.inc.php
new file mode 100644
index 0000000..9cb0577
--- /dev/null
+++ b/juggl/services/jsonBuilder.inc.php
@@ -0,0 +1,37 @@
+<?php
+class JsonBuilder {
+    function __construct () {
+        $this->jsonData = array();
+    }
+
+    function getJson () {
+        return json_encode($this->jsonData, JSON_FORCE_OBJECT);
+    }
+
+    function getArray () {
+        return $this->jsonData;
+    }
+
+    function addCategories (array $categories) {
+        $columns = array("id" => "",
+                        "name" => "");
+
+        foreach ($categories as $category) {
+            $this->jsonData['categories'] = array();
+            $this->jsonData['categories'][] = $this->createJsonArray($category, $columns);
+        }
+        return $this;
+    }
+
+    private function createJsonArray (array $data, array $columns) {
+        $jsonArray = array();
+        foreach ($columns as $key => $column) {
+            if ($column === "") {
+                $column = $key;
+            }
+            $jsonArray[$key] = $data[$column];
+        }
+        return $jsonArray;
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/paramCleaner.inc.php b/juggl/services/paramCleaner.inc.php
new file mode 100644
index 0000000..e6ef868
--- /dev/null
+++ b/juggl/services/paramCleaner.inc.php
@@ -0,0 +1,41 @@
+<?php
+class ParamCleaner {
+    function __construct (array $params) {
+        $this->sourceParams = $params;
+        $this->selectedParams = $params;
+        $this->errorCount = 0;
+        $this->errorMessage = "";
+    }
+
+    function select (string $prop = "") {
+        if ($prop == "") {
+            $this->selectedParams = $this->sourceParams;
+        } else {
+            $this->selectedParams = $this->selectedParams[$prop];
+        }
+    }
+
+    function get (string $prop) {
+        if(isset($this->selectedParams[$prop])) {
+            return $this->selectedParams[$prop];
+        } else {
+            $this->errorCount += 1;
+            $this->errorMessage .= "Property \"{$prop}\" missing. ";
+            return null;
+        }
+    }
+    
+    function hasErrorOccurred () {
+        return $this->errorCount > 0;
+    }
+    
+    function getErrorMessage () {
+        return $this->errorMessage;
+    }
+    
+    function resetErrors () {
+        $this->errorMessage = "";
+        $this->errorCount = 0;
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/requestTypes.inc.php b/juggl/services/requestTypes.inc.php
new file mode 100644
index 0000000..97607e6
--- /dev/null
+++ b/juggl/services/requestTypes.inc.php
@@ -0,0 +1,19 @@
+<?php
+require_once(__DIR__.'/basicEnum.inc.php');
+
+abstract class RequestType extends BasicEnum {
+    const GET = "GET";
+    const POST = "POST";
+    const PUT = "PUT";
+    const DELETE = "DELETE";
+}
+
+function currentRequestType () {
+    $requestType = $_SERVER['REQUEST_METHOD'];
+    if (RequestType::isValidValue($requestType)) {
+        return $requestType;
+    } else {
+        return null;
+    }
+}
+?>
\ No newline at end of file
diff --git a/juggl/services/responses.inc.php b/juggl/services/responses.inc.php
new file mode 100644
index 0000000..51c0cb7
--- /dev/null
+++ b/juggl/services/responses.inc.php
@@ -0,0 +1,25 @@
+<?php
+require_once(__DIR__."/jsonBuilder.inc.php");
+
+function respondJson(JsonBuilder $builder) {
+    header('Content-type: application/json');
+    echo($builder->getJson());
+}
+
+function respondHtml(string $html) {
+    print($html);
+}
+
+function respondStatus(int $statusCode, string $message = "") {
+    http_response_code($statusCode);
+    die($message);
+}
+
+function redirectBack() {
+    header("Location: {$_SERVER['HTTP_REFERER']}");
+}
+
+function redirectTo($url) {
+    header("Location: {$url}");
+}
+?>
\ No newline at end of file
diff --git a/juggl/timetracking.php b/juggl/timetracking.php
new file mode 100644
index 0000000..246799e
--- /dev/null
+++ b/juggl/timetracking.php
@@ -0,0 +1,17 @@
+<?php
+require_once(__DIR__."/services/apiBranch.inc.php");
+require_once(__DIR__."/services/jsonBuilder.inc.php");
+require_once(__DIR__."/services/responses.inc.php");
+
+class TimeTrackingBranch extends ApiBranch {
+    function get (ParamCleaner $params) {
+        respondStatus(404);
+    }
+
+    function post (ParamCleaner $params) {
+    }
+}
+
+$branch = new TimeTrackingBranch();
+$branch->execute();
+?>
\ No newline at end of file