diff --git a/package-lock.json b/package-lock.json
index 592c9500..cece9dc1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11835,6 +11835,7 @@
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-3.1.1.tgz",
       "integrity": "sha512-LpB/54B+/2J5hqQ7imZHfdU31OlgQqx7ZicVlkm9kzg9/w8GKLEcFfJl/t7DCEDueOyBAD6zCCwTO6Fzs0NoEQ==",
+      "dev": true,
       "license": "ISC",
       "engines": {
         "node": ">=16"
@@ -21007,6 +21008,7 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/which/-/which-4.0.0.tgz",
       "integrity": "sha512-GlaYyEb07DPxYCKhKzplCWBJtvxZcZMrL+4UkrTSJHHPyZU4mYYTv3qaOe77H7EODLSSopAUFAc6W8U4yqvscg==",
+      "dev": true,
       "dependencies": {
         "isexe": "^3.1.1"
       },
@@ -21552,8 +21554,7 @@
         "lodash.get": "^4.4.2",
         "set-value": "^4.1.0",
         "source-map-support": "0.5.19",
-        "supports-color": "9.2.1",
-        "which": "^4.0.0"
+        "supports-color": "9.2.1"
       },
       "devDependencies": {
         "@babel/core": "^7.12.10",
diff --git a/packages/build/build/commands.js b/packages/build/build/commands.js
index f026487b..e6de9d5f 100644
--- a/packages/build/build/commands.js
+++ b/packages/build/build/commands.js
@@ -224,7 +224,7 @@ exports.commands = (program, flecks) => {
         }
         const webpackConfig = await flecks.resolveBuildConfig('fleckspack.config.js');
         const cmd = [
-          await binaryPath('webpack'),
+          await binaryPath('webpack', '@flecks/build'),
           ...((watch || hot) ? ['watch'] : []),
           '--config', webpackConfig,
           '--mode', (production && !hot) ? 'production' : 'development',
@@ -310,7 +310,7 @@ exports.commands = (program, flecks) => {
           .map((pkg) => join(process.cwd(), pkg))
           .map(async (cwd) => {
             const cmd = [
-              await binaryPath('eslint'),
+              await binaryPath('eslint', '@flecks/build'),
               '--config', await flecks.resolveBuildConfig('eslint.config.js'),
               '.',
             ];
diff --git a/packages/core/package.json b/packages/core/package.json
index 9554d5cc..94dcf075 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -30,8 +30,7 @@
     "lodash.get": "^4.4.2",
     "set-value": "^4.1.0",
     "source-map-support": "0.5.19",
-    "supports-color": "9.2.1",
-    "which": "^4.0.0"
+    "supports-color": "9.2.1"
   },
   "devDependencies": {
     "@babel/core": "^7.12.10",
diff --git a/packages/core/src/server/process.js b/packages/core/src/server/process.js
index ed496b2e..acf80354 100644
--- a/packages/core/src/server/process.js
+++ b/packages/core/src/server/process.js
@@ -1,21 +1,37 @@
-const {exec, fork, spawn} = require('child_process');
+const {fork, spawn} = require('child_process');
+const {
+  access,
+  constants: {X_OK},
+  realpath,
+} = require('fs/promises');
+const {dirname, join, sep} = require('path');
 
 const D = require('../../build/debug');
 
 const debug = D('@flecks/core/server');
 const debugSilly = debug.extend('silly');
 
-exports.binaryPath = (binary) => (
-  new Promise((resolve, reject) => {
-    exec(`npx which ${binary}`, (error, stdout) => {
-      if (error) {
-        reject(error);
-        return;
-      }
-      resolve(stdout.trim());
-    });
-  })
-);
+const {
+  FLECKS_CORE_ROOT = process.cwd(),
+} = process.env;
+
+exports.binaryPath = async (binary, root = FLECKS_CORE_ROOT) => {
+  // eslint-disable-next-line no-eval
+  const resolved = dirname(await realpath(eval('require').resolve(join(root, 'package.json'))));
+  const parts = resolved.split(sep);
+  while (parts.length > 0) {
+    const path = parts.concat(join('node_modules', '.bin', binary)).join(sep);
+    try {
+      // eslint-disable-next-line no-await-in-loop
+      await access(path, X_OK);
+      return path;
+    }
+    catch (error) {
+      parts.pop();
+    }
+  }
+  throw new Error(`Binary '${binary}' not found! (root: ${root})`);
+};
 
 exports.processCode = (child) => new Promise((resolve, reject) => {
   child.on('error', reject);
diff --git a/packages/electron/build/flecks.bootstrap.js b/packages/electron/build/flecks.bootstrap.js
index 3490755d..5801571f 100644
--- a/packages/electron/build/flecks.bootstrap.js
+++ b/packages/electron/build/flecks.bootstrap.js
@@ -1,4 +1,12 @@
-const {join} = require('path');
+const {
+  basename,
+  dirname,
+  extname,
+  join,
+  relative,
+} = require('path');
+
+const {binaryPath} = require('@flecks/core/src/server');
 
 exports.hooks = {
   '@flecks/core.config': () => ({
@@ -25,16 +33,24 @@ exports.hooks = {
      */
     url: undefined,
   }),
-  '@flecks/build.config.alter': (configs) => {
-    const {server: config} = configs;
-    if (config) {
-      const plugin = config.plugins.find(({pluginName}) => pluginName === 'StartServerPlugin');
-      // Extremely hackish, c'est la vie.
+  '@flecks/build.config.alter': async (configs) => {
+    const electronPath = await binaryPath('electron', '@flecks/electron');
+    const {server} = configs;
+    if (server) {
+      const plugin = server.plugins.find(({pluginName}) => pluginName === 'StartServerPlugin');
       if (plugin) {
+        const relativePath = relative(server.output.path, electronPath);
         const {exec} = plugin.options;
         plugin.options.exec = (compilation) => {
-          plugin.options.args = [join(config.output.path, compilation.getPath(exec))];
-          return join('..', '..', 'node_modules', '.bin', 'electron');
+          const assetPath = compilation.getPath(exec);
+          const trimmed = join(dirname(assetPath), basename(assetPath, extname(assetPath)));
+          plugin.options.args = [
+            join(
+              server.output.path,
+              `${trimmed}.mjs`,
+            ),
+          ];
+          return relativePath;
         };
       }
     }
diff --git a/packages/server/test/server/build/build.js b/packages/server/test/server/build/build.js
index e74c8ae1..8785af46 100644
--- a/packages/server/test/server/build/build.js
+++ b/packages/server/test/server/build/build.js
@@ -30,7 +30,7 @@ export async function createApplication() {
 
 export async function buildChild(path, {args = [], opts = {}} = {}) {
   return spawnWith(
-    [await binaryPath('flecks'), 'build', ...args],
+    [await binaryPath('flecks', '@flecks/build'), 'build', ...args],
     {
       ...opts,
       env: {
diff --git a/packages/web/build/flecks.bootstrap.js b/packages/web/build/flecks.bootstrap.js
index 59a8e1ed..698ea3ff 100644
--- a/packages/web/build/flecks.bootstrap.js
+++ b/packages/web/build/flecks.bootstrap.js
@@ -3,7 +3,7 @@ const {join} = require('path');
 
 const Build = require('@flecks/build/build/build');
 const {regexFromExtensions} = require('@flecks/build/src/server');
-const {spawnWith} = require('@flecks/core/src/server');
+const {binaryPath, spawnWith} = require('@flecks/core/src/server');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 
 const {
@@ -161,14 +161,12 @@ exports.hooks = {
       return;
     }
     // Bail if the build isn't watching.
-    if (!process.argv.find((arg) => '--watch' === arg)) {
+    if (!process.argv.find((arg) => 'watch' === arg)) {
       return;
     }
     // Otherwise, spawn `webpack-dev-server` (WDS).
     const cmd = [
-      // `npx` doesn't propagate signals!
-      // 'npx', 'webpack',
-      join(FLECKS_CORE_ROOT, 'node_modules', '.bin', 'webpack'),
+      await binaryPath('webpack', '@flecks/build'),
       'serve',
       '--mode', 'development',
       '--hot',