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diff --git a/lib/prog/jao-clojure.el b/lib/prog/jao-clojure.el
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+;;; jao-clojure.el --- Clojure utilities             -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2025  Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <mail@jao.io>
+;; Keywords: languages
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Helpers for clojure coding
+
+;;; Code:
+
+(require 'clojure-mode)
+(require 'project)
+
+;;;; Jumping between implementation and test files
+(defun jao-clojure--ext-dir (prefix)
+  (let* ((ext (file-name-extension buffer-file-name))
+         (ext-rx (format "/%s/" ext)))
+    (if (string-match-p ext-rx buffer-file-name)
+        (format "%s/%s" prefix ext)
+      prefix)))
+
+(defun jao-clojure-find-current-test ()
+  (save-excursion
+    (and (re-search-backward
+          "(deftest\\(?:\\W+^:\\w+\\)*\\W+\\b\\(.+\\)\\b" nil t)
+         (match-string-no-properties 1))))
+
+(defvar jao-clojure--src-candidates '("lib" "src" "srv" "app"))
+
+(defun jao-clojure--test-namespace-p (ns)
+  (or (string-suffix-p "-test" ns)
+      (string-match "\\(.+\\)\\.\\(test\\)\\(\\..+\\)" ns)))
+
+(defun jao-clojure-test-buffer-p ()
+  (jao-clojure--test-namespace-p (clojure-find-ns)))
+
+(defun jao-clojure--test-for (namespace sep)
+  (funcall cider-test-infer-test-ns namespace))
+
+(defun jao-clojure--infer-test-ns (ns)
+  (if (jao-clojure--test-namespace-p ns)
+      ns
+    (jao-clojure--test-for ns ".")))
+
+(defun jao-clojure--root () (project-root (project-current)))
+
+(defun jao-clojure-jump-to-test ()
+  "Jump from implementation to test file."
+  (interactive)
+  (let* ((f (format "%s/%s/%s.%s"
+                    (jao-clojure--root)
+                    (jao-clojure--ext-dir "test")
+                    (jao-clojure--test-for (clojure-find-ns) "/")
+                    (file-name-extension buffer-file-name)))
+         (f (replace-regexp-in-string "-" "_" f)))
+    (find-file f)))
+
+(defun jao-clojure--implementation-for (namespace)
+  (let ((n (replace-regexp-in-string "-test$" "" namespace)))
+    (replace-regexp-in-string "\\.test\\." "." n)))
+
+(defun jao-clojure--find-implementation (src)
+  (let ((f (format "%s/%s/%s.%s"
+                   (jao-clojure--root)
+                   (jao-clojure--ext-dir src)
+                   (jao-clojure--implementation-for (clojure-find-ns))
+                   (file-name-extension buffer-file-name))))
+    (and (file-exists-p f) f)))
+
+(defun jao-clojure-jump-to-implementation ()
+  "Jump from test file to implementation."
+  (interactive)
+  (let ((impl (car (seq-keep #'jao-clojure--find-implementation
+                             jao-clojure--src-candidates))))
+    (if impl (find-file impl) (message "No implementation file found"))))
+
+(defun jao-clojure-other-file ()
+  "Toggle between implementation and test file"
+  (interactive)
+  (if (jao-clojure-test-buffer-p)
+      (jao-clojure-jump-to-implementation)
+    (jao-clojure-jump-to-test)))
+
+(provide 'jao-clojure)
+;;; jao-clojure.el ends here