diff --git a/modules/cloudflare/main.tf b/modules/cloudflare/dns/main.tf
similarity index 100%
rename from modules/cloudflare/main.tf
rename to modules/cloudflare/dns/main.tf
diff --git a/modules/cloudflare/provider.tf b/modules/cloudflare/dns/provider.tf
similarity index 100%
rename from modules/cloudflare/provider.tf
rename to modules/cloudflare/dns/provider.tf
diff --git a/modules/cloudflare/variables.tf b/modules/cloudflare/dns/variables.tf
similarity index 100%
rename from modules/cloudflare/variables.tf
rename to modules/cloudflare/dns/variables.tf
diff --git a/projects/dev/main.tf b/projects/dev/main.tf
deleted file mode 100644
index 9adeb6d..0000000
--- a/projects/dev/main.tf
+++ /dev/null
@@ -1,210 +0,0 @@
-terraform {
-  backend "gcs" {
-    bucket = "goboolean-terraform-state"
-    prefix = "dev"
-  }
-}
-
-module "service" {
-  source = "../../modules/gcp/service"
-  project_id = var.project_id
-}
-
-module "iam" {
-  source = "../../modules/gcp/iam"
-  project_id = var.project_id
-  region = var.region
-}
-
-module "gce" {
-  source = "../../modules/gcp/gce"
-  zone = var.zone
-  service_account_email = module.iam.atlantis_service_account_email
-}
-
-module "cloudflare" {
-  source = "../../modules/cloudflare"
-  api_token = var.cloudflare_api_token
-  zone_id = var.cloudflare_zone_id
-  ip_address = module.istio.istio_gateway_ip
-}
-
-module "acme" {
-  source = "../../modules/cloudflare/acme"
-
-  cloudflare_email = var.cloudflare_email
-  cloudflare_api_token = var.cloudflare_api_token
-  cloudflare_zone_id = var.cloudflare_zone_id
-  cloudflare_api_key = var.cloudflare_api_key
-}
-
-module "gcs" {
-  source = "../../modules/gcp/gcs"
-  project_id = var.project_id
-  location = var.location
-}
-
-module "gke" {
-  source = "../../modules/gcp/gke"
-  region = var.region
-  project_id = var.project_id
-  zone = var.zone
-}
-
-module "namespace" {
-  source = "../../modules/gcp/gke/namespace"
-}
-
-module "istio" {
-  source = "../../modules/infra/istio"
-  depends_on = [module.gke, module.namespace]
-}
-
-module "cert_manager" {
-  source = "../../modules/infra/cert-manager"
-  depends_on = [module.gke, module.namespace]
-  cloudflare_api_token = var.cloudflare_api_token
-}
-
-module "vault" {
-  source = "../../modules/infra/vault"
-  depends_on = [module.gke, module.namespace]
-}
-
-module "argocd" {
-  source = "../../modules/infra/argocd"
-  depends_on = [module.gke, module.namespace]
-}
-
-module "kafka" {
-  source = "../../modules/infra/kafka"
-  depends_on = [module.gke, module.namespace]
-}
-
-module "etcd" {
-  source = "../../modules/infra/etcd"
-  depends_on = [module.gke, module.namespace]
-}
-
-module "opentelemetry" {
-  source = "../../modules/infra/opentelemetry"
-  depends_on = [module.gke, module.namespace]
-}
-
-/*
-  The following infrastructure depends on Vault.
-  Therefore, it should be separated into a distinct module
-  and divided into stages.
-*/
-# module "argocd-application" {
-#   source = "../../modules/infra/argocd/application"
-#   depends_on = [module.argocd, module.namespace]
-#   providers = {
-#     argocd = argocd
-#   }
-# }
-
-data "vault_kv_secret_v2" "harbor" {
-  mount = "kv-v2"
-  name = "infra/harbor"
-}
-
-module "harbor" {
-  source = "../../modules/infra/harbor"
-  depends_on = [module.gke, module.namespace]
-  harbor_url = data.vault_kv_secret_v2.harbor.data["url"]
-  harbor_username = data.vault_kv_secret_v2.harbor.data["username"]
-  harbor_password = data.vault_kv_secret_v2.harbor.data["password"]
-  providers = {
-    harbor = harbor
-  }
-}
-
-data "vault_kv_secret_v2" "postgresql" {
-  mount = "kv-v2"
-  name = "infra/postgresql"
-}
-
-module "postgresql" {
-  source = "../../modules/infra/postgresql"
-  depends_on = [module.gke, module.namespace]
-  postgresql_username = data.vault_kv_secret_v2.postgresql.data["username"]
-  postgresql_password = data.vault_kv_secret_v2.postgresql.data["password"]
-}
-
-# module "fetch-system-util" {
-#   source = "../../modules/infra/argocd/job/fetch-system.util"
-#   depends_on = [module.argocd, module.postgresql, module.namespace]
-#   providers = {
-#     argocd = argocd
-#   }
-# }
-
-data "vault_kv_secret_v2" "influxdb" {
-  mount = "kv-v2"
-  name = "infra/influxdb"
-}
-
-module "influxdb" {
-  source = "../../modules/infra/influxdb"
-  depends_on = [module.gke, module.namespace]
-  influxdb_username = data.vault_kv_secret_v2.influxdb.data["username"]
-  influxdb_password = data.vault_kv_secret_v2.influxdb.data["password"]
-  influxdb_token = data.vault_kv_secret_v2.influxdb.data["token"]
-}
-
-module "telegraf" {
-  source = "../../modules/infra/fetch-system/telegraf"
-  depends_on = [module.gke, module.namespace]
-  influxdb_token = data.vault_kv_secret_v2.influxdb.data["token"]
-}
-
-data "vault_kv_secret_v2" "grafana" {
-  mount = "kv-v2"
-  name = "infra/grafana"
-}
-
-# module "grafana" {
-#   source = "../../modules/infra/grafana"
-#   depends_on = [module.gke, module.namespace]
-#   grafana_username = data.vault_kv_secret_v2.grafana.data["username"]
-#   grafana_password = data.vault_kv_secret_v2.grafana.data["password"]
-#   influxdb_token = data.vault_kv_secret_v2.influxdb.data["token"]
-# }
-
-module "kube-prometheus-stack" {
-  source = "../../modules/infra/monitoring/kube-prometheus-stack"
-  depends_on = [module.gke, module.namespace]
-  grafana_username = data.vault_kv_secret_v2.grafana.data["username"]
-  grafana_password = data.vault_kv_secret_v2.grafana.data["password"]
-}
-
-data "vault_kv_secret_v2" "airflow" {
-  mount = "kv-v2"
-  name = "infra/airflow"
-}
-
-module "airflow" {
-  source = "../../modules/infra/airflow"
-  depends_on = [module.gke, module.namespace]
-  airflow_username = data.vault_kv_secret_v2.airflow.data["username"]
-  airflow_password = data.vault_kv_secret_v2.airflow.data["password"]
-  postgres_host = "postgresql.postgresql.svc.cluster.local"
-  postgres_user = data.vault_kv_secret_v2.postgresql.data["username"]
-  postgres_password = data.vault_kv_secret_v2.postgresql.data["password"]
-}
-
-module "loki-stack" {
-  source = "../../modules/infra/monitoring/loki-stack"
-  depends_on = [module.iam, module.gke, module.namespace]
-  project_id = var.project_id
-}
-
-module "github" {
-  source = "../../modules/github"
-}
-
-module "dex" {
-  source = "../../modules/infra/dex"
-  depends_on = [module.gke, module.namespace]
-}
diff --git a/projects/dev/provider.tf b/projects/dev/provider.tf
deleted file mode 100644
index f8f15c0..0000000
--- a/projects/dev/provider.tf
+++ /dev/null
@@ -1,121 +0,0 @@
-terraform {
-  required_providers {
-    google = {
-      source  = "hashicorp/google"
-      version = "4.84.0"
-    }
-
-    cloudflare = {
-      source  = "cloudflare/cloudflare"
-      version = "5.0.0-rc1"
-    }
-
-    acme = {
-      source = "vancluever/acme"
-      version = "2.29.0"
-    }
-
-    kubectl = {
-      source  = "gavinbunney/kubectl"
-      version = ">= 1.14.0"
-    }
-
-    /*
-      The following infrastructure depends on Vault.
-      Therefore, it should be separated into a distinct module
-      and divided into stages.
-    */
-    vault = {
-      source  = "hashicorp/vault"
-      version = "4.6.0"
-    }
-
-    argocd = {
-      source  = "argoproj-labs/argocd"
-      version = "7.3.0"
-    }
-
-    harbor = {
-      source  = "goharbor/harbor"
-      version = "3.10.19"
-    }
-  }
-  required_version = ">= 0.14"
-}
-
-provider "google" {
-  project = var.project_id
-  region = var.region
-}
-
-provider "cloudflare" {
-  api_token = var.cloudflare_api_token
-}
-
-provider "acme" {
-  server_url = "https://acme-staging-v02.api.letsencrypt.org/directory"
-}
-
-provider "kubernetes" {
-  host                   = module.gke.kubernetes_provider_config.host
-  token                  = module.gke.kubernetes_provider_config.token
-  cluster_ca_certificate = module.gke.kubernetes_provider_config.cluster_ca_certificate
-}
-
-provider "helm" {
-  kubernetes {
-    host                   = module.gke.kubernetes_provider_config.host
-    token                  = module.gke.kubernetes_provider_config.token
-    cluster_ca_certificate = module.gke.kubernetes_provider_config.cluster_ca_certificate
-  }
-}
-
-provider "kubectl" {
-  host                   = module.gke.kubernetes_provider_config.host
-  token                  = module.gke.kubernetes_provider_config.token
-  cluster_ca_certificate = module.gke.kubernetes_provider_config.cluster_ca_certificate
-  load_config_file       = false
-}
-
-/*
-  The following infrastructure depends on Vault.
-  Therefore, it should be separated into a distinct module
-  and divided into stages.
-*/
-provider "vault" {
-  address = "https://vault.goboolean.io"
-  auth_login {
-    path = "auth/approle/login"
-    parameters = {
-      role_id   = var.vault_role_id
-      secret_id = var.vault_secret_id
-    }
-  }
-}
-
-data "vault_kv_secret_v2" "argocd" {
-  mount = "kv-v2"
-  name = "infra/argocd"
-}
-
-provider "argocd" {
-  server_addr = "argocd.goboolean.io:443"
-  username = data.vault_kv_secret_v2.argocd.data["username"]
-  password = data.vault_kv_secret_v2.argocd.data["password"]
-}
-
-provider "harbor" {
-  url = data.vault_kv_secret_v2.harbor.data["url"]
-  username = data.vault_kv_secret_v2.harbor.data["username"]
-  password = data.vault_kv_secret_v2.harbor.data["password"]
-}
-
-data "vault_kv_secret_v2" "github" {
-  mount = "kv-v2"
-  name = "infra/github"
-}
-
-provider "github" {
-  owner = "goboolean"
-  token = data.vault_kv_secret_v2.github.data["admin_token"]
-}
diff --git a/projects/dev/terraform.tfvars b/projects/dev/terraform.tfvars
deleted file mode 100644
index cd33ecd..0000000
--- a/projects/dev/terraform.tfvars
+++ /dev/null
@@ -1,5 +0,0 @@
-# Google Cloud Platform
-project_id = "goboolean-448812"
-region     = "asia-northeast3"
-zone       = "asia-northeast3-a"
-location   = "ASIA"
diff --git a/projects/dev/variables.tf b/projects/dev/variables.tf
deleted file mode 100644
index 4c02f4c..0000000
--- a/projects/dev/variables.tf
+++ /dev/null
@@ -1,39 +0,0 @@
-# Google Cloud Platform
-variable "project_id" {
-  description = "project id"
-}
-variable "region" {
-  description = "region"
-}
-variable "zone" {
-  description = "zone"
-}
-variable "location" {
-  description = "location"
-}
-
-# Cloudflare
-variable "cloudflare_email" {
-  description = "cloudflare email"
-}
-variable "cloudflare_api_token" {
-  description = "cloudflare api token"
-}
-variable "cloudflare_zone_id" {
-  description = "cloudflare zone id"
-}
-variable "cloudflare_api_key" {
-  description = "cloudflare api key"
-}
-
-/*
-  The following infrastructure depends on Vault.
-  Therefore, it should be separated into a distinct module
-  and divided into stages.
-*/
-variable "vault_role_id" {
-  description = "vault role id"
-}
-variable "vault_secret_id" {
-  description = "vault secret id"
-}
diff --git a/projects/domain/main.tf b/projects/domain/main.tf
index eb3ba18..facbbc8 100644
--- a/projects/domain/main.tf
+++ b/projects/domain/main.tf
@@ -9,8 +9,8 @@ module "istio" {
   source = "../../modules/infra/istio"
 }
 
-module "cloudflare" {
-  source = "../../modules/cloudflare"
+module "dns" {
+  source = "../../modules/cloudflare/dns"
   api_token = local.cloudflare_api_token
   zone_id = local.cloudflare_zone_id
   ip_address = module.istio.istio_gateway_ip