diff --git a/environments/dev/main.tf b/environments/dev/main.tf
new file mode 100644
index 0000000..95db99c
--- /dev/null
+++ b/environments/dev/main.tf
@@ -0,0 +1,52 @@
+terraform {
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~> 6.0"
+    }
+  }
+}
+
+provider "google" {
+  project = var.project_id
+  region  = var.region
+}
+
+module "network" {
+  source = "./modules/network"
+  
+  # Variables d'entrée
+  project_name = var.project_name
+  region      = var.region
+  
+  # Autres variables spécifiques au module
+  cidr_range  = "10.0.0.0/16"
+}
+
+module "network" {
+  source = "./modules/iam"
+  
+  # Variables d'entrée
+  project_name = var.project_name
+  region      = var.region
+  
+  # Autres variables spécifiques au module
+  cidr_range  = "10.0.0.0/16"
+}
+
+module "network" {
+  source = "./modules/compute"
+  
+  # Variables d'entrée
+  project_name = var.project_name
+  region      = var.region
+  
+  # Autres variables spécifiques au module
+  cidr_range  = "10.0.0.0/16"
+  backend_cidr = var.backend_cidr
+  frontend_cidr = var.frontend_cidr
+  database_cidr = var.database_cidr
+  ssh_source_ranges = var.ssh_source_ranges
+  zone = var.zone
+  instance_type = var.instance_type
+}
\ No newline at end of file
diff --git a/environments/dev/outputs.tf b/environments/dev/outputs.tf
new file mode 100644
index 0000000..e69de29
diff --git a/environments/dev/variables.tf b/environments/dev/variables.tf
new file mode 100644
index 0000000..7407106
--- /dev/null
+++ b/environments/dev/variables.tf
@@ -0,0 +1,53 @@
+variable "project_id" {
+  description = "ID du projet GCP"
+  type        = string
+  default     = "97892"
+}
+
+variable "project_name" {
+  description = "nom_du_projet"
+  type        = string
+  default     = "terraforming"
+}
+
+variable "region" {
+  description = "emplacement"
+  type        = string
+  default     = "europe-west4"
+}
+
+variable "frontend_cidr" {
+  description = "addr_front"
+  type        = string
+  default     = "10.0.1.0/24"
+}
+
+variable "backend_cidr" {
+  description = "addr_back"
+  type        = string
+  default     = "10.0.2.0/24"
+}
+
+variable "database_cidr" {
+  description = "addr_bdd"
+  type        = string
+  default     = "10.0.3.0/24"
+}
+
+variable "ssh_source_ranges" {
+  description = "addr_ssh"
+  type        = string
+  default     = "0.0.0.0/0"
+}
+
+variable "instance_type" {
+  description = "type d'instance"
+  type        = string
+  default     = "e2-micro"
+}
+
+variable "zone" {
+  description = "zone"
+  type        = string
+  default     = "europe-west4-a"
+}
diff --git a/modules/compute/main.tf b/modules/compute/main.tf
new file mode 100644
index 0000000..b3cd088
--- /dev/null
+++ b/modules/compute/main.tf
@@ -0,0 +1,72 @@
+resource "google_compute_instance" "vm-front" {
+  name         = "vm-front"
+  machine_type = var.instance_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-11"
+      size  = 10
+    }
+  }
+
+  network_interface {
+    subnetwork = google_compute_subnetwork.subnet.id
+    access_config {} # IP publique
+  }
+
+  tags = ["web", "ssh"]
+
+  metadata = {
+    enable-oslogin = "TRUE"
+  }
+}
+
+resource "google_compute_instance" "vm-back" {
+  name         = "vm-back"
+  machine_type = var.instance_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-11"
+      size  = 10
+    }
+  }
+
+  network_interface {
+    subnetwork = google_compute_subnetwork.subnet.id
+    access_config {} # IP publique
+  }
+
+  tags = ["backend", "ssh"]
+
+  metadata = {
+    enable-oslogin = "TRUE"
+  }
+}
+
+resource "google_compute_instance" "vm-database" {
+  name         = "vm"-database
+  machine_type = var.instance_type
+  zone         = var.zone
+
+  boot_disk {
+    initialize_params {
+      image = "debian-cloud/debian-11"
+      size  = 20
+    }
+  }
+
+  network_interface {
+    subnetwork = google_compute_subnetwork.subnet.id
+    access_config {} # IP publique
+  }
+
+  tags = ["database", "ssh"]
+
+  metadata = {
+    enable-oslogin = "TRUE"
+  }
+}
+
diff --git a/modules/compute/outputs.tf b/modules/compute/outputs.tf
new file mode 100644
index 0000000..80e1b80
--- /dev/null
+++ b/modules/compute/outputs.tf
@@ -0,0 +1,4 @@
+# Output
+output "instance_ip" {
+  value = google_compute_instance.main.network_interface[0].access_config[0].nat_ip
+}
\ No newline at end of file
diff --git a/modules/compute/variables.tf b/modules/compute/variables.tf
new file mode 100644
index 0000000..34a788d
--- /dev/null
+++ b/modules/compute/variables.tf
@@ -0,0 +1,31 @@
+variable "instance_type" {
+  description = "type d'instance"
+  type        = string
+  default     = "e2-micro"
+}
+
+variable "zone" {
+  description = "zone"
+  type        = string
+  default     = "europe-west4-a"
+}
+
+variable "frontend_subnet_id" {
+  description = "front sub id"
+  type        = string
+  default     = "10.0.1.0/24"
+}
+
+variable "backend_subnet_id" {
+  description = "back sub id"
+  type        = string
+  default     = "10.0.2.0/24"
+}
+
+variable "database_subnet_id" {
+  description = "data sub id"
+  type        = string
+  default     = "10.0.3.0/24"
+}
+
+
diff --git a/modules/iam/main.tf b/modules/iam/main.tf
new file mode 100644
index 0000000..e69de29
diff --git a/modules/iam/outputs.tf b/modules/iam/outputs.tf
new file mode 100644
index 0000000..e69de29
diff --git a/modules/iam/variables.tf b/modules/iam/variables.tf
new file mode 100644
index 0000000..e69de29
diff --git a/modules/network/main.tf b/modules/network/main.tf
index e69de29..0300491 100644
--- a/modules/network/main.tf
+++ b/modules/network/main.tf
@@ -0,0 +1,77 @@
+resource "google_compute_network" "vpc" {
+  name                    = "net1"
+  auto_create_subnetworks = false
+}
+
+# Sous-réseau
+resource "google_compute_subnetwork" "subnet1" {
+  name          = "frontend"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.frontend_cidr
+  region        = var.region
+}
+
+resource "google_compute_subnetwork" "subnet2" {
+  name          = "backend"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.backend_cidr
+  region        = var.region
+
+resource "google_compute_subnetwork" "subnet3" {
+  name          = "database"
+  network       = google_compute_network.vpc.id
+  ip_cidr_range = var.database_cidr
+  region        = var.region
+}
+
+resource "google_compute_firewall" "allow_http" {
+  name    = "rule-http"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["80", "443"]
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+  target_tags   = ["web"]
+}
+
+resource "google_compute_firewall" "allow_ssh" {
+  name    = "allow-ssh"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["22"]
+  }
+
+  source_ranges = [var.ssh_source_ranges]
+  target_tags   = ["ssh"]
+}
+
+resource "google_compute_firewall" "front_to_back" {
+  name    = "front_to_back"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["8000"]
+  }
+
+  source_tags = ["web"]
+  target_tags   = ["backend"]
+}
+
+resource "google_compute_firewall" "back_to_bdd" {
+  name    = "back_to_bdd"
+  network = google_compute_network.vpc.id
+
+  allow {
+    protocol = "tcp"
+    ports    = ["8000"]
+  }
+
+  source_tags = ["backend"]
+  target_tags   = ["database"]
+}
\ No newline at end of file
diff --git a/modules/network/outputs.tf b/modules/network/outputs.tf
index e69de29..80e1b80 100644
--- a/modules/network/outputs.tf
+++ b/modules/network/outputs.tf
@@ -0,0 +1,4 @@
+# Output
+output "instance_ip" {
+  value = google_compute_instance.main.network_interface[0].access_config[0].nat_ip
+}
\ No newline at end of file