diff --git a/internal/router/router.go b/internal/router/router.go
new file mode 100644
index 0000000..502fd73
--- /dev/null
+++ b/internal/router/router.go
@@ -0,0 +1,51 @@
+package router
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/kevinmarquesp/go-postr/internal/controllers"
+	"github.com/kevinmarquesp/go-postr/internal/repositories"
+	"github.com/kevinmarquesp/go-postr/internal/services"
+)
+
+func StartRouter(port string) error {
+	if port == "" {
+		return errors.New("Empty port value error.")
+	}
+
+	// Enabled repositories.
+
+	userRepository, err := repositories.NewSqliteUserRepository("./tmp/database.sqlite3")
+	if err != nil {
+		return err
+	}
+
+	// Enalbed services.
+
+	authenticationService := services.NewGopostrAuthenticationService(userRepository)
+
+	// Routes definition.
+
+	apiRouter := http.NewServeMux()
+
+	apiUserHandler := controllers.NewApiUserHandler(authenticationService)
+
+	apiRouter.HandleFunc("POST /user", apiUserHandler.RegisterNewUserWithCredentials)
+	apiRouter.HandleFunc("GET /user/{username}", apiUserHandler.FetchUserDataByUsername)
+	apiRouter.HandleFunc("PUT /user", apiUserHandler.UpdateProfileDetails)
+	apiRouter.HandleFunc("DELETE /user", apiUserHandler.RemoveRegisteredUser)
+
+	router := http.NewServeMux()
+
+	router.Handle("/api/v1/", http.StripPrefix("/api/v1", apiRouter))
+
+	// Server initialization.
+
+	server := http.Server{
+		Addr:    ":" + port,
+		Handler: router,
+	}
+
+	return server.ListenAndServe()
+}