diff --git a/user/app/emacs/default.nix b/user/app/emacs/default.nix
index 0d09c671..1c010376 100644
--- a/user/app/emacs/default.nix
+++ b/user/app/emacs/default.nix
@@ -14,12 +14,14 @@
         nerd-icons nerd-icons-dired nerd-icons-corfu
         nerd-icons-ibuffer nerd-icons-completion
         yasnippet
-        projectile treemacs
+        projectile treemacs treemacs-projectile
+        treesit-grammars.with-all-grammars
         magit magit-file-icons
         vterm sudo-edit
         gdscript-mode
         nix-mode
         python python-mode
+        lsp-mode flycheck lsp-ui lsp-treemacs
       ];
     })
     fira-code
diff --git a/user/app/emacs/init.el b/user/app/emacs/init.el
index 553dee67..b34cdcd2 100644
--- a/user/app/emacs/init.el
+++ b/user/app/emacs/init.el
@@ -360,3 +360,25 @@
 (evil-define-key 'normal 'global (kbd "<leader>fU") 'sudo-edit)
 (evil-define-key 'normal 'global (kbd "<leader>fu") 'sudo-edit-find-file)
 
+(require 'lsp-mode)
+(add-hook 'gdscript-ts-mode-hook #'lsp-deferred)
+
+(use-package flycheck
+  :init
+  (global-flycheck-mode))
+
+(use-package treemacs
+  :config
+  (add-hook 'projectile-after-switch-project-hook 'treemacs-add-and-display-current-project-exclusively))
+
+(use-package lsp-mode
+  :init
+  ;; set prefix for lsp-command-keymap (few alternatives - "C-l", "C-c l")
+  (setq lsp-keymap-prefix (kbd "SPC l"))
+  :hook (;; replace XXX-mode with concrete major-mode(e. g. python-mode)
+         (gdscript-mode . lsp)
+         (gdscript-ts-mode . lsp))
+  :commands lsp-deferred)
+
+(use-package lsp-ui :commands lsp-ui-mode)
+(use-package lsp-treemacs :commands lsp-treemacs-errors-list)