diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8af972c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f05cae
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,43 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac ###
+.DS_Store
+
+### yml ###
+cakey-api/src/main/resources/application.yml
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..c9ddab0
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,71 @@
+// plugin 이란 미리 구성해놓은 task 들의 모음이며, 특정 빌드과정에 필요한 기본정보를 포함함
+plugins {
+	id 'java'// 테스트, 번들링 기능과 함께 Java 컴파일을 추가해주며, 다른 JVM 언어 플러그인의 기반이 됨
+	id 'org.springframework.boot' version '3.2.1' // 실행가능한 jar 또는 war로 패키징하여 애플리케이션 실행이 가능하도록 하며, spring-boot-dependencies 기반의 의존성 관리를 사용함
+	id 'io.spring.dependency-management' version '1.1.4' // 자동으로 spring-boot-dependencies bom을 끌어와서 버전 관리를 해줌
+}
+
+// 현재의 root 프로젝트와 앞으로 추가될 서브 모듈에 대한 설정
+allprojects {
+
+	group = 'com.cakey'
+	version = '0.0.1-SNAPSHOT'
+
+	java {
+		sourceCompatibility = JavaVersion.VERSION_17
+		targetCompatibility = JavaVersion.VERSION_17
+	}
+
+	// 라이브러리들을 받아올 원격 저장소들을 설정함
+	repositories {
+		mavenCentral()
+	}
+}
+
+//컴파일 시 필요한 애너테이션 프로세서가 올바르게 적용되도록 설정하는 역할
+//allprojects안에 넣으면 안되는 이유 : allprojects는 서브 모듈의 빌드 구성 전에 실행됩니다. 만약 configurations {}를 allprojects에 넣으면, 아직 서브 모듈에서 java 플러그인이나 관련 플러그인이 적용되지 않은 상태에서 실행될 수 있습니다.
+//이로 인해 compileOnly 또는 annotationProcessor가 정의되지 않았다는 오류가 발생할 수 있습니다.
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
+// 루트 제외한 전체 서브 모듈에 해당되는 설정
+// settings.gradle에 include된 전체 프로젝트에 대한 공통 사항을 명시함
+// root 프로젝트까지 적용하고 싶다면 allprojects에서 사용해야 함
+subprojects {
+
+	// subprojects 블록 안에서는 plugins 블록을 사용할 수 없으므로 apply plugin을 사용해야 함
+	apply plugin: "java"
+	apply plugin: "org.springframework.boot"
+	apply plugin: "io.spring.dependency-management"
+
+	configurations {
+		compileOnly {
+			extendsFrom annotationProcessor
+		}
+	}
+
+	// 모든 서브 모듈에서 사용될 공통 의존성들을 추가함
+	dependencies {
+		implementation 'org.springframework.boot:spring-boot-starter-web:3.2.1'
+		annotationProcessor "org.projectlombok:lombok:1.18.22"
+		compileOnly "org.projectlombok:lombok:1.18.22"
+
+		//Test
+		testImplementation 'org.springframework.boot:spring-boot-starter-test:3.2.1'
+		testCompileOnly("org.projectlombok:lombok:1.18.22")
+		testAnnotationProcessor("org.projectlombok:lombok:1.18.22")
+	}
+
+	// 모든 서브 모듈에서 Junit을 사용하기 위한 설정
+	tasks.named("test") {
+		useJUnitPlatform()
+	}
+}
+
+bootJar { enabled = false }
+jar { enabled = true }
+
+
diff --git a/cakey-api/build.gradle b/cakey-api/build.gradle
new file mode 100644
index 0000000..cb11c69
--- /dev/null
+++ b/cakey-api/build.gradle
@@ -0,0 +1,20 @@
+plugins {
+    id 'org.springframework.boot' //api에 있는 springBootApplication으로 실행할 것이기 때문
+}
+
+dependencies {
+    implementation project(':cakey-common')   // 공통 모듈 의존성
+    implementation project(':cakey-domain')   // 도메인 모듈 의존성
+    implementation project(':cakey-auth')     // 인증 모듈 의존성
+    implementation project(':cakey-external')     // 외부 모듈 의존성
+
+    implementation 'mysql:mysql-connector-java:8.0.33'
+    implementation 'org.springframework.boot:spring-boot-starter-actuator'
+
+}
+
+// 실행가능한 jar로 생성하는 옵션, main이 없는 라이브러리에서는 false로 비활성화함
+bootJar { enabled = true }
+
+// 외부에서 의존하기 위한 jar로 생성하는 옵션, main이 없는 라이브러리에서는 true로 비활성화함
+jar { enabled = false }
diff --git a/cakey-api/src/main/java/com/cakey/CakeyServerApplication.java b/cakey-api/src/main/java/com/cakey/CakeyServerApplication.java
new file mode 100644
index 0000000..d813b4a
--- /dev/null
+++ b/cakey-api/src/main/java/com/cakey/CakeyServerApplication.java
@@ -0,0 +1,11 @@
+package com.cakey;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CakeyServerApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(CakeyServerApplication.class, args);
+    }
+}
\ No newline at end of file
diff --git a/cakey-auth/build.gradle b/cakey-auth/build.gradle
new file mode 100644
index 0000000..48bf7be
--- /dev/null
+++ b/cakey-auth/build.gradle
@@ -0,0 +1,6 @@
+bootJar { enabled = false }
+jar { enabled = true }
+
+dependencies {
+    implementation project(':cakey-common')   // 공통 모듈 의존성
+}
diff --git a/cakey-auth/src/main/java/com/cakey/Main.java b/cakey-auth/src/main/java/com/cakey/Main.java
new file mode 100644
index 0000000..4a3a482
--- /dev/null
+++ b/cakey-auth/src/main/java/com/cakey/Main.java
@@ -0,0 +1,7 @@
+package com.cakey;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}
\ No newline at end of file
diff --git a/cakey-common/build.gradle b/cakey-common/build.gradle
new file mode 100644
index 0000000..a2a82a8
--- /dev/null
+++ b/cakey-common/build.gradle
@@ -0,0 +1,2 @@
+bootJar { enabled = false }
+jar { enabled = true }
diff --git a/cakey-common/src/main/java/com/cakey/Main.java b/cakey-common/src/main/java/com/cakey/Main.java
new file mode 100644
index 0000000..4a3a482
--- /dev/null
+++ b/cakey-common/src/main/java/com/cakey/Main.java
@@ -0,0 +1,7 @@
+package com.cakey;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}
\ No newline at end of file
diff --git a/cakey-domain/build.gradle b/cakey-domain/build.gradle
new file mode 100644
index 0000000..2da0965
--- /dev/null
+++ b/cakey-domain/build.gradle
@@ -0,0 +1,8 @@
+bootJar { enabled = false }
+jar { enabled = true }
+
+dependencies {
+    implementation project(':cakey-common')   // 공통 모듈 의존성
+    implementation project(':cakey-auth')     // 인증 모듈 의존성
+    implementation project(':cakey-external')     // 외부 모듈 의존성
+}
diff --git a/cakey-domain/src/main/java/com/cakey/Main.java b/cakey-domain/src/main/java/com/cakey/Main.java
new file mode 100644
index 0000000..4a3a482
--- /dev/null
+++ b/cakey-domain/src/main/java/com/cakey/Main.java
@@ -0,0 +1,7 @@
+package com.cakey;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}
\ No newline at end of file
diff --git a/cakey-external/build.gradle b/cakey-external/build.gradle
new file mode 100644
index 0000000..774b5a4
--- /dev/null
+++ b/cakey-external/build.gradle
@@ -0,0 +1,6 @@
+bootJar { enabled = false }
+jar { enabled = true }
+
+dependencies {
+    implementation project(":cakey-common")
+}
diff --git a/cakey-external/src/main/java/com/cakey/Main.java b/cakey-external/src/main/java/com/cakey/Main.java
new file mode 100644
index 0000000..4a3a482
--- /dev/null
+++ b/cakey-external/src/main/java/com/cakey/Main.java
@@ -0,0 +1,7 @@
+package com.cakey;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..a4b76b9
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e2847c8
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..f5feea6
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,252 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..9d21a21
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..6ecbb1f
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,7 @@
+rootProject.name = 'cakey-server'
+include 'cakey-api'
+include 'cakey-auth'
+include 'cakey-common'
+include 'cakey-domain'
+include 'cakey-external'
+