diff --git a/package-lock.json b/package-lock.json
index 77cbddb..2a985d9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
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+        "configurable-http-proxy": "^4.6.2",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-select": "^5.7.4",
@@ -34,6 +34,7 @@
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         "jest": "^29.7.0",
         "jest-environment-jsdom": "^29.7.0",
+        "jest-fetch-mock": "^3.0.3",
         "react-test-renderer": "^18.3.1",
         "style-loader": "^3.3.2",
         "webpack": "^5.6.0",
@@ -1868,16 +1869,18 @@
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-      "resolved": "https://registry.npmjs.org/@colors/colors/-/colors-1.6.0.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/@colors%2fcolors/-/colors-1.6.0.tgz",
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+      "license": "MIT",
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-      "resolved": "https://registry.npmjs.org/@dabh/diagnostics/-/diagnostics-2.0.3.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/@dabh%2fdiagnostics/-/diagnostics-2.0.3.tgz",
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+      "license": "MIT",
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@@ -3658,8 +3661,9 @@
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+      "resolved": "http://verdaccio.ds.io:4873/@types%2ftriple-beam/-/triple-beam-1.3.5.tgz",
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+      "license": "MIT"
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+      "version": "3.2.6",
+      "resolved": "http://verdaccio.ds.io:4873/async/-/async-3.2.6.tgz",
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+      "license": "MIT"
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@@ -4572,8 +4577,9 @@
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+      "resolved": "http://verdaccio.ds.io:4873/bintrees/-/bintrees-1.0.2.tgz",
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+      "license": "MIT"
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-      "resolved": "https://registry.npmjs.org/color/-/color-3.2.1.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/color/-/color-3.2.1.tgz",
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+      "license": "MIT",
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@@ -4923,8 +4930,9 @@
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-      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.9.1.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/color-string/-/color-string-1.9.1.tgz",
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@@ -4938,8 +4946,9 @@
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-      "resolved": "https://registry.npmjs.org/colorspace/-/colorspace-1.1.4.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/colorspace/-/colorspace-1.1.4.tgz",
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@@ -5029,15 +5038,16 @@
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+      "resolved": "http://verdaccio.ds.io:4873/configurable-http-proxy/-/configurable-http-proxy-4.6.2.tgz",
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-        "winston": "~3.11.0"
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@@ -5222,6 +5232,16 @@
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+      "resolved": "http://verdaccio.ds.io:4873/cross-fetch/-/cross-fetch-3.1.8.tgz",
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+      "dev": true,
+      "license": "MIT",
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+      "resolved": "http://verdaccio.ds.io:4873/enabled/-/enabled-2.0.0.tgz",
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+      "resolved": "http://verdaccio.ds.io:4873/fecha/-/fecha-4.2.3.tgz",
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+      "resolved": "http://verdaccio.ds.io:4873/fn.name/-/fn.name-1.1.0.tgz",
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+      "license": "MIT"
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@@ -7202,6 +7226,20 @@
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+    "node_modules/http-proxy-node16": {
+      "version": "1.0.3",
+      "resolved": "http://verdaccio.ds.io:4873/http-proxy-node16/-/http-proxy-node16-1.0.3.tgz",
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+        "follow-redirects": "^1.0.0",
+        "requires-port": "^1.0.0"
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@@ -8613,6 +8651,17 @@
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       }
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+    "node_modules/jest-fetch-mock": {
+      "version": "3.0.3",
+      "resolved": "http://verdaccio.ds.io:4873/jest-fetch-mock/-/jest-fetch-mock-3.0.3.tgz",
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+      "license": "MIT",
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+        "promise-polyfill": "^8.1.3"
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+      "resolved": "http://verdaccio.ds.io:4873/logform/-/logform-2.6.1.tgz",
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+    "node_modules/node-fetch": {
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+      "resolved": "http://verdaccio.ds.io:4873/node-fetch/-/node-fetch-2.7.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      },
+      "engines": {
+        "node": "4.x || >=6.0.0"
+      },
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+        "encoding": "^0.1.0"
+      },
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+        }
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+      "resolved": "http://verdaccio.ds.io:4873/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o=",
+      "dev": true,
+      "license": "MIT"
+    },
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+      "resolved": "http://verdaccio.ds.io:4873/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE=",
+      "dev": true,
+      "license": "BSD-2-Clause"
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+      "version": "5.0.0",
+      "resolved": "http://verdaccio.ds.io:4873/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
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+      "license": "MIT",
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@@ -10902,8 +11000,9 @@
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@@ -10911,6 +11010,13 @@
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+      "license": "MIT",
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@@ -11846,16 +11953,18 @@
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+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
+      "license": "MIT",
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+      "resolved": "http://verdaccio.ds.io:4873/is-arrayish/-/is-arrayish-0.3.2.tgz",
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@@ -11957,8 +12066,9 @@
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+      "version": "2.5.0",
+      "resolved": "http://verdaccio.ds.io:4873/safe-stable-stringify/-/safe-stable-stringify-2.5.0.tgz",
+      "integrity": "sha512-b3rppTKm9T+PsVCBEOUR46GWI7fdOs00VKZ1+9c1EWDaDMvjQc6tUwuFyIprgGgTcWoVHSKrU8H31ZHA2e0RHA=="
     },
     "safer-buffer": {
       "version": "2.1.2",
@@ -22285,15 +22470,15 @@
     },
     "simple-swizzle": {
       "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
-      "integrity": "sha512-JA//kQgZtbuY83m+xT+tXJkmJncGMTFT+C+g2h2R9uxkYIrE2yy9sgmcLhCnw57/WSD+Eh3J97FPEDFnbXnDUg==",
+      "resolved": "http://verdaccio.ds.io:4873/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
       "requires": {
         "is-arrayish": "^0.3.1"
       },
       "dependencies": {
         "is-arrayish": {
           "version": "0.3.2",
-          "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+          "resolved": "http://verdaccio.ds.io:4873/is-arrayish/-/is-arrayish-0.3.2.tgz",
           "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ=="
         }
       }
@@ -22385,8 +22570,8 @@
     },
     "stack-trace": {
       "version": "0.0.10",
-      "resolved": "https://registry.npmjs.org/stack-trace/-/stack-trace-0.0.10.tgz",
-      "integrity": "sha512-KGzahc7puUKkzyMt+IqAep+TVNbKP+k2Lmwhub39m1AsTSkaDutx56aDCo+HLDzf/D26BIHTJWNiTG1KAJiQCg=="
+      "resolved": "http://verdaccio.ds.io:4873/stack-trace/-/stack-trace-0.0.10.tgz",
+      "integrity": "sha1-VHxws0fo0ytOEI6hoqFZ5f3eGcA="
     },
     "stack-utils": {
       "version": "2.0.6",
@@ -22412,9 +22597,9 @@
       "dev": true
     },
     "strftime": {
-      "version": "0.10.2",
-      "resolved": "https://registry.npmjs.org/strftime/-/strftime-0.10.2.tgz",
-      "integrity": "sha512-Y6IZaTVM80chcMe7j65Gl/0nmlNdtt+KWPle5YeCAjmsBfw+id2qdaJ5MDrxUq+OmHKab+jHe7mUjU/aNMSZZg=="
+      "version": "0.10.3",
+      "resolved": "http://verdaccio.ds.io:4873/strftime/-/strftime-0.10.3.tgz",
+      "integrity": "sha512-DZrDUeIF73eKJ4/GgGuv8UHWcUQPYDYfDeQFj3jrx+JZl6GQE656MbHIpvbo4mEG9a5DgS8GRCc5DxJXD2udDQ=="
     },
     "string_decoder": {
       "version": "1.3.0",
@@ -22584,7 +22769,7 @@
     },
     "tdigest": {
       "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/tdigest/-/tdigest-0.1.2.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/tdigest/-/tdigest-0.1.2.tgz",
       "integrity": "sha512-+G0LLgjjo9BZX2MfdvPfH+MKLCrxlXSYec5DaPYP1fe6Iyhf0/fSmJ0bFiZ1F8BT6cGXl2LpltQptzjXKWEkKA==",
       "requires": {
         "bintrees": "1.0.2"
@@ -22649,7 +22834,7 @@
     },
     "text-hex": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/text-hex/-/text-hex-1.0.0.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/text-hex/-/text-hex-1.0.0.tgz",
       "integrity": "sha512-uuVGNWzgJ4yhRaNSiubPY7OjISw4sw4E5Uv0wbjp+OzcbmVU/rsT8ujgcXJhn9ypzsgr5vlzpPqP+MBBKcGvbg=="
     },
     "text-table": {
@@ -22713,7 +22898,7 @@
     },
     "triple-beam": {
       "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.4.1.tgz",
+      "resolved": "http://verdaccio.ds.io:4873/triple-beam/-/triple-beam-1.4.1.tgz",
       "integrity": "sha512-aZbgViZrg1QNcG+LULa7nhZpJTZSLm/mXnHXnbAbjmN5aSa0y7V+wvv6+4WaBtpISJzThKy+PIPxc1Nq1EJ9mg=="
     },
     "tslib": {
@@ -23333,30 +23518,30 @@
       "dev": true
     },
     "winston": {
-      "version": "3.11.0",
-      "resolved": "https://registry.npmjs.org/winston/-/winston-3.11.0.tgz",
-      "integrity": "sha512-L3yR6/MzZAOl0DsysUXHVjOwv8mKZ71TrA/41EIduGpOOV5LQVodqN+QdQ6BS6PJ/RdIshZhq84P/fStEZkk7g==",
+      "version": "3.13.1",
+      "resolved": "http://verdaccio.ds.io:4873/winston/-/winston-3.13.1.tgz",
+      "integrity": "sha512-SvZit7VFNvXRzbqGHsv5KSmgbEYR5EiQfDAL9gxYkRqa934Hnk++zze0wANKtMHcy/gI4W/3xmSDwlhf865WGw==",
       "requires": {
         "@colors/colors": "^1.6.0",
         "@dabh/diagnostics": "^2.0.2",
         "async": "^3.2.3",
         "is-stream": "^2.0.0",
-        "logform": "^2.4.0",
+        "logform": "^2.6.0",
         "one-time": "^1.0.0",
         "readable-stream": "^3.4.0",
         "safe-stable-stringify": "^2.3.1",
         "stack-trace": "0.0.x",
         "triple-beam": "^1.3.0",
-        "winston-transport": "^4.5.0"
+        "winston-transport": "^4.7.0"
       }
     },
     "winston-transport": {
-      "version": "4.7.0",
-      "resolved": "https://registry.npmjs.org/winston-transport/-/winston-transport-4.7.0.tgz",
-      "integrity": "sha512-ajBj65K5I7denzer2IYW6+2bNIVqLGDHqDw3Ow8Ohh+vdW+rv4MZ6eiDvHoKhfJFZ2auyN8byXieDDJ96ViONg==",
+      "version": "4.7.1",
+      "resolved": "http://verdaccio.ds.io:4873/winston-transport/-/winston-transport-4.7.1.tgz",
+      "integrity": "sha512-wQCXXVgfv/wUPOfb2x0ruxzwkcZfxcktz6JIMUaPLmcNhO4bZTwA/WtDWK74xV3F2dKu8YadrFv0qhwYjVEwhA==",
       "requires": {
-        "logform": "^2.3.2",
-        "readable-stream": "^3.6.0",
+        "logform": "^2.6.1",
+        "readable-stream": "^3.6.2",
         "triple-beam": "^1.3.0"
       }
     },
diff --git a/package.json b/package.json
index f90c9de..dadd6ad 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@jupyterhub/binderhub-client": "0.4.0",
-    "configurable-http-proxy": "^4.6.1",
+    "configurable-http-proxy": "^4.6.2",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-select": "^5.7.4",
@@ -48,6 +48,7 @@
     "identity-obj-proxy": "^3.0.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
+    "jest-fetch-mock": "^3.0.3",
     "react-test-renderer": "^18.3.1",
     "style-loader": "^3.3.2",
     "webpack": "^5.6.0",
@@ -55,6 +56,7 @@
     "webpack-dev-server": "^4.9.3"
   },
   "jest": {
+    "automock": false,
     "testEnvironment": "jsdom",
     "testMatch": [
       "<rootDir>/src/**/*.test.js"
diff --git a/setupTests.js b/setupTests.js
index e20d173..980252d 100644
--- a/setupTests.js
+++ b/setupTests.js
@@ -1,4 +1,22 @@
+import { jest } from "@jest/globals";
 import "@testing-library/jest-dom";
+import fetchMock from "jest-fetch-mock";
+fetchMock.enableMocks();
+
+HTMLCanvasElement.prototype.getContext = () => {};
+Object.defineProperty(window, "matchMedia", {
+  writable: true,
+  value: jest.fn().mockImplementation((query) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: jest.fn(), // Deprecated
+    removeListener: jest.fn(), // Deprecated
+    addEventListener: jest.fn(),
+    removeEventListener: jest.fn(),
+    dispatchEvent: jest.fn(),
+  })),
+});
 
 window.profileList = [
   {
diff --git a/src/ImageBuilder.jsx b/src/ImageBuilder.jsx
index 74bead9..12a6159 100644
--- a/src/ImageBuilder.jsx
+++ b/src/ImageBuilder.jsx
@@ -1,4 +1,7 @@
-import { useEffect, useState } from "react";
+import { useEffect, useState, useRef } from "react";
+import Select from "react-select";
+import useRepositoryField from "./hooks/useRepositoryField";
+import useRefField from "./hooks/useRefField";
 
 async function buildImage(repo, ref, term, fitAddon, onImageBuilt) {
   const { BinderRepository } = await import("@jupyterhub/binderhub-client");
@@ -86,23 +89,33 @@ function ImageLogs({ setTerm, setFitAddon }) {
     </div>
   );
 }
+
 export function ImageBuilder({ name }) {
-  const [repo, setRepo] = useState("");
+  const { repo, repoId, repoFieldProps, repoError, repoIsValidating } =
+    useRepositoryField();
+  const { ref, refError, refFieldProps, refIsLoading } = useRefField(repoId);
+  const repoFieldRef = useRef();
+  const branchFieldRef = useRef();
+
   const [customImage, setCustomImage] = useState("");
-  const [error, setError] = useState("");
 
-  // FIXME: Allow users to actually configure this
-  const [ref, _] = useState("HEAD"); // eslint-disable-line no-unused-vars
   const [term, setTerm] = useState(null);
   const [fitAddon, setFitAddon] = useState(null);
 
   const handleBuildStart = async () => {
     if (!repo) {
-      setError("Provide a Github repository.");
+      repoFieldRef.current.focus();
+      repoFieldRef.current.blur();
+      return;
+    }
+
+    if (!ref) {
+      branchFieldRef.current.focus();
+      branchFieldRef.current.blur();
       return;
     }
 
-    await buildImage(repo, ref, term, fitAddon, (imageName) => {
+    await buildImage(repoId, ref, term, fitAddon, (imageName) => {
       setCustomImage(imageName);
       term.write(
         "\nImage has been built! Click the start button to launch your server",
@@ -116,28 +129,73 @@ export function ImageBuilder({ name }) {
   // don't generate the hidden input that posts the built image out.
   return (
     <>
-      <div className={`profile-option-container ${error ? "has-error" : ""}`}>
+      <div className="profile-option-container">
+        <div className="profile-option-label-container">
+          <b>Provider</b>
+        </div>
+        <div className="profile-option-control-container">GitHub</div>
+      </div>
+
+      <div
+        className={`profile-option-container ${repoError ? "has-error" : ""}`}
+      >
         <div className="profile-option-label-container">
-          <label htmlFor="github-repo">GitHub Repository</label>
+          <label htmlFor="repo">Repository</label>
         </div>
         <div className="profile-option-control-container">
           <input
-            id="github-repo"
+            id="repo"
             type="text"
-            value={repo}
-            onChange={(e) => setRepo(e.target.value)}
+            ref={repoFieldRef}
+            {...repoFieldProps}
+            aria-invalid={!!repoError}
           />
-          {error && <div className="profile-option-control-error">{error}</div>}
-          <button
-            type="button"
-            className="btn btn-jupyter pull-right"
-            onClick={handleBuildStart}
-          >
-            Build image
-          </button>
+          {repoIsValidating && (
+            <div className="profile-option-control-info">
+              Validating repository...
+            </div>
+          )}
+          {repoError && (
+            <div className="profile-option-control-error">{repoError}</div>
+          )}
         </div>
-        <input name={name} type="hidden" value={customImage} />
       </div>
+
+      <div
+        className={`profile-option-container ${repoError ? "has-error" : ""}`}
+      >
+        <div className="profile-option-label-container">
+          <label>Git Ref</label>
+        </div>
+        <div className="profile-option-control-container">
+          <Select
+            aria-label="Git Ref"
+            ref={branchFieldRef}
+            {...refFieldProps}
+            aria-invalid={!!refError}
+            isDisabled={!refFieldProps.options}
+          />
+          {refIsLoading && !refIsLoading && (
+            <div className="profile-option-control-info">
+              Loading Git ref options...
+            </div>
+          )}
+          {refError && (
+            <div className="profile-option-control-error">{refError}</div>
+          )}
+        </div>
+      </div>
+
+      <div className="right-button">
+        <button
+          type="button"
+          className="btn btn-jupyter"
+          onClick={handleBuildStart}
+        >
+          Build image
+        </button>
+      </div>
+      <input name={name} type="hidden" value={customImage} />
       <ImageLogs setFitAddon={setFitAddon} setTerm={setTerm} />
     </>
   );
diff --git a/src/ImageBuilder.test.js b/src/ImageBuilder.test.js
new file mode 100644
index 0000000..defc260
--- /dev/null
+++ b/src/ImageBuilder.test.js
@@ -0,0 +1,320 @@
+import { expect, test } from "@jest/globals";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+
+import ProfileForm from "./ProfileForm";
+import { SpawnerFormProvider } from "./state";
+
+test("select repository by org/repo", async () => {
+  fetch
+    .mockResponseOnce("")
+    .mockResponseOnce(JSON.stringify([{ name: "main" }, { name: "develop" }]))
+    .mockResponseOnce(JSON.stringify([{ name: "v1.0" }]));
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "org/repo");
+  await user.click(document.body);
+
+  const branchField = await screen.getByLabelText("Git Ref");
+  await user.click(branchField);
+  await user.click(screen.getByText("main"));
+  expect(fetch.mock.calls[0][0]).toEqual(
+    "https://api.github.com/repos/org/repo",
+  );
+});
+
+test("select repository by https://github.com/org/repo", async () => {
+  fetch
+    .mockResponseOnce("")
+    .mockResponseOnce(JSON.stringify([{ name: "main" }, { name: "develop" }]))
+    .mockResponseOnce(JSON.stringify([{ name: "v1.0" }]));
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "https://github.com/org/repo");
+  await user.click(document.body);
+
+  const branchField = await screen.getByLabelText("Git Ref");
+  await user.click(branchField);
+  await user.click(screen.getByText("main"));
+  expect(fetch.mock.calls[0][0]).toEqual(
+    "https://api.github.com/repos/org/repo",
+  );
+});
+
+test("select repository by https://www.github.com/org/repo", async () => {
+  fetch
+    .mockResponseOnce("")
+    .mockResponseOnce(JSON.stringify([{ name: "main" }, { name: "develop" }]))
+    .mockResponseOnce(JSON.stringify([{ name: "v1.0" }]));
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "https://www.github.com/org/repo");
+  await user.click(document.body);
+
+  const branchField = await screen.getByLabelText("Git Ref");
+  await user.click(branchField);
+  await user.click(screen.getByText("main"));
+  expect(fetch.mock.calls[0][0]).toEqual(
+    "https://api.github.com/repos/org/repo",
+  );
+});
+
+test("select repository by github.com/org/repo", async () => {
+  fetch
+    .mockResponseOnce("")
+    .mockResponseOnce(JSON.stringify([{ name: "main" }, { name: "develop" }]))
+    .mockResponseOnce(JSON.stringify([{ name: "v1.0" }]));
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "github.com/org/repo");
+  await user.click(document.body);
+
+  const branchField = await screen.getByLabelText("Git Ref");
+  await user.click(branchField);
+  await user.click(screen.getByText("main"));
+  expect(fetch.mock.calls[0][0]).toEqual(
+    "https://api.github.com/repos/org/repo",
+  );
+});
+
+test("select repository by www.github.com/org/repo", async () => {
+  fetch
+    .mockResponseOnce("")
+    .mockResponseOnce(JSON.stringify([{ name: "main" }, { name: "develop" }]))
+    .mockResponseOnce(JSON.stringify([{ name: "v1.0" }]));
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "www.github.com/org/repo");
+  await user.click(document.body);
+
+  const branchField = await screen.getByLabelText("Git Ref");
+  await user.click(branchField);
+  await user.click(screen.getByText("main"));
+  expect(fetch.mock.calls[0][0]).toEqual(
+    "https://api.github.com/repos/org/repo",
+  );
+});
+
+test("invalid org/repo string (not matching pattern)", async () => {
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "org");
+  await user.click(document.body);
+
+  expect(
+    screen.getByText(
+      "Provide the repository as the format 'organization/repository'.",
+    ),
+  );
+  expect(screen.queryByLabelText("Git Ref")).toHaveAttribute("disabled");
+});
+
+test("invalid org/repo string (wrong base URL)", async () => {
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "example.com/org/repo");
+  await user.click(document.body);
+
+  expect(
+    screen.getByText(
+      "Provide the repository as the format 'organization/repository'.",
+    ),
+  );
+  expect(screen.queryByLabelText("Git Ref")).toHaveAttribute("disabled");
+});
+
+test("repo not found", async () => {
+  fetch.mockResponseOnce("", { status: 400 });
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "https://github.com/org/repo");
+  await user.click(document.body);
+
+  expect(screen.queryByLabelText("Git Ref")).toHaveAttribute("disabled");
+});
+
+test("no org/repo provided", async () => {
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+  await user.click(screen.getByRole("button", { name: "Build image" }));
+
+  expect(
+    screen.getByText(
+      "Provide the repository as the format 'organization/repository'.",
+    ),
+  );
+});
+
+test("no branch selected", async () => {
+  fetch
+    .mockResponseOnce("")
+    .mockResponseOnce(JSON.stringify([{ name: "main" }, { name: "develop" }]))
+    .mockResponseOnce(JSON.stringify([{ name: "v1.0" }]));
+  const user = userEvent.setup();
+
+  render(
+    <SpawnerFormProvider>
+      <ProfileForm />
+    </SpawnerFormProvider>,
+  );
+  const radio = screen.getByRole("radio", {
+    name: "CPU only No GPU, only CPU",
+  });
+  await user.click(radio);
+
+  const select = screen.getByLabelText("Image - dynamic image building");
+  await user.click(select);
+
+  await user.click(screen.getByText("Build your own image"));
+
+  const repoField = screen.getByLabelText("Repository");
+  await user.type(repoField, "org/repo");
+  await user.click(document.body);
+
+  expect(screen.queryByLabelText("Git Ref")).toBeInTheDocument();
+  await user.click(screen.getByRole("button", { name: "Build image" }));
+
+  expect(screen.getByText("Select a git ref."));
+});
diff --git a/src/form.css b/src/form.css
index 4626d9f..3910bc8 100644
--- a/src/form.css
+++ b/src/form.css
@@ -75,6 +75,10 @@
   border-radius: 4px;
 }
 
+.profile-option-control-info {
+  margin-top: 0.5rem;
+}
+
 .profile-option-container.has-error label {
   color: red;
 }
@@ -97,6 +101,11 @@
   margin-top: 0.5rem;
 }
 
+.right-button {
+  text-align: right;
+  margin-bottom: 2rem;
+}
+
 /* react-select styling */
 .react-select-item-container.react-select-item-menu-display.react-select-item-selected
   .react-select-item-description {
diff --git a/src/hooks/useRefField.js b/src/hooks/useRefField.js
new file mode 100644
index 0000000..c872cb9
--- /dev/null
+++ b/src/hooks/useRefField.js
@@ -0,0 +1,64 @@
+import { useState, useEffect, useMemo } from "react";
+
+function fetchRef(repository, refType) {
+  return fetch(`https://api.github.com/repos/${repository}/${refType}`).then(
+    (r) => {
+      if (r.ok) return r.json();
+    },
+  );
+}
+
+export default function useRefField(repository) {
+  const [value, setValue] = useState("");
+  const [options, setOptions] = useState();
+  const [error, setError] = useState();
+  const [isLoading, setIsLoading] = useState();
+
+  const selectedOption = useMemo(() => {
+    if (!value || !options) return;
+    return options.find((option) => option.value === value);
+  }, [value]);
+
+  useEffect(() => {
+    setIsLoading(true);
+    setOptions();
+    if (repository) {
+      Promise.all([
+        fetchRef(repository, "branches"),
+        fetchRef(repository, "tags"),
+      ])
+        .then((results) => {
+          const refOptions = results.flat().map(({ name }) => ({
+            label: name,
+            value: name,
+          }));
+          setOptions(refOptions);
+        })
+        .finally(() => setIsLoading(false));
+    }
+  }, [repository]);
+
+  const onChange = (e) => {
+    setError();
+    setValue(e.value);
+  };
+
+  const onBlur = () => {
+    setError();
+    if (!value) {
+      setError("Select a git ref.");
+    }
+  };
+
+  return {
+    ref: value,
+    refError: error,
+    refIsLoading: isLoading,
+    refFieldProps: {
+      value: selectedOption,
+      options,
+      onChange,
+      onBlur,
+    },
+  };
+}
diff --git a/src/hooks/useRepositoryField.js b/src/hooks/useRepositoryField.js
new file mode 100644
index 0000000..5363fd5
--- /dev/null
+++ b/src/hooks/useRepositoryField.js
@@ -0,0 +1,76 @@
+import { useCallback, useState } from "react";
+
+function extractOrgAndRepo(value) {
+  let orgRepoString;
+  const orgRepoMatch = /^[^/]+\/[^/]+$/.exec(value);
+
+  if (orgRepoMatch) {
+    orgRepoString = orgRepoMatch[0];
+  } else {
+    const fullUrlMatch =
+      /^(?:https?:\/\/)?(?:www\.)?github\.com\/((?:[^/]+\/[^/]+|[^/]+\/[^/]+)?)\/?$/.exec(
+        value,
+      );
+    if (fullUrlMatch) {
+      orgRepoString = fullUrlMatch[1];
+    }
+  }
+
+  return orgRepoString;
+}
+
+export default function useRepositoryField() {
+  const [value, setValue] = useState("");
+  const [error, setError] = useState();
+  const [repoId, setRepoId] = useState();
+  const [isValidating, setIsValidating] = useState(false);
+
+  const validate = async () => {
+    setIsValidating(true);
+    setError();
+    const orgRepoString = extractOrgAndRepo(value);
+
+    if (!orgRepoString) {
+      return "Provide the repository as the format 'organization/repository'.";
+    }
+
+    const repoExists = await fetch(
+      `https://api.github.com/repos/${orgRepoString}`,
+      {
+        method: "HEAD",
+      },
+    )
+      .then((r) => r.ok)
+      .finally(() => setIsValidating(false));
+
+    if (!repoExists) {
+      return "The repository doesn't exist or is not public.";
+    }
+  };
+
+  const onChange = useCallback((e) => {
+    setValue(e.target.value);
+  }, []);
+
+  const onBlur = useCallback(async () => {
+    setRepoId();
+    const err = await validate();
+    if (err) {
+      setError(err);
+    } else {
+      setRepoId(extractOrgAndRepo(value));
+    }
+  }, [value]);
+
+  return {
+    repo: value,
+    repoError: error,
+    repoId,
+    repoIsValidating: isValidating,
+    repoFieldProps: {
+      value,
+      onChange,
+      onBlur,
+    },
+  };
+}