diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 5dba7004dae2..eb487bd2cb6c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -842,6 +842,9 @@ importers:
       tar-stream:
         specifier: 3.1.7
         version: 3.1.7
+      tree-kill:
+        specifier: 1.2.2
+        version: 1.2.2
 
 packages:
 
@@ -7759,6 +7762,10 @@ packages:
     peerDependencies:
       tslib: '2'
 
+  tree-kill@1.2.2:
+    resolution: {integrity: sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==}
+    hasBin: true
+
   ts-api-utils@2.4.0:
     resolution: {integrity: sha512-3TaVTaAv2gTiMB35i3FiGJaRfwb3Pyn/j3m/bfAvGe8FB7CF6u+LMYqYlDh7reQf7UNvoTvdfAqHGmPGOSsPmA==}
     engines: {node: '>=18.12'}
@@ -16405,6 +16412,8 @@ snapshots:
     dependencies:
       tslib: 2.8.1
 
+  tree-kill@1.2.2: {}
+
   ts-api-utils@2.4.0(typescript@5.9.3):
     dependencies:
       typescript: 5.9.3
diff --git a/tests/e2e/utils/BUILD.bazel b/tests/e2e/utils/BUILD.bazel
index dbbda05702cd..d4493fb14492 100644
--- a/tests/e2e/utils/BUILD.bazel
+++ b/tests/e2e/utils/BUILD.bazel
@@ -20,5 +20,6 @@ ts_project(
         "//:node_modules/verdaccio-auth-memory",
         "//tests:node_modules/@types/tar-stream",
         "//tests:node_modules/tar-stream",
+        "//tests:node_modules/tree-kill",
     ],
 )
diff --git a/tests/e2e/utils/process.ts b/tests/e2e/utils/process.ts
index 54bcf629a69e..91216843086a 100644
--- a/tests/e2e/utils/process.ts
+++ b/tests/e2e/utils/process.ts
@@ -1,7 +1,7 @@
 import { spawn, SpawnOptions } from 'node:child_process';
 import * as child_process from 'node:child_process';
 import { getGlobalVariable, getGlobalVariablesEnv } from './env';
-import { setTimeout as sleep } from 'node:timers/promises';
+import treeKill from 'tree-kill';
 import { delimiter, join, resolve } from 'node:path';
 import { stripVTControlCharacters, styleText } from 'node:util';
 
@@ -255,37 +255,29 @@ export async function waitForAnyProcessOutputToMatch(
   return matchingProcess;
 }
 
-/**
- * Kills all tracked processes with a retry mechanism.
- */
-export async function killAllProcesses(signal: NodeJS.Signals = 'SIGTERM'): Promise<void> {
-  let attempts = 0;
-  const maxRetries = 3;
-
-  while (_processes.length > 0 && attempts < maxRetries) {
-    attempts++;
-
-    // Iterate backwards so we can remove elements while looping if needed.
-    for (let i = _processes.length - 1; i >= 0; i--) {
-      const childProc = _processes[i];
+export async function killAllProcesses(signal = 'SIGTERM'): Promise<void> {
+  const processesToKill: Promise<void>[] = [];
 
-      if (!childProc || childProc.killed) {
-        _processes.splice(i, 1);
-        continue;
-      }
-
-      const killed = childProc.kill(signal);
-      if (killed) {
-        _processes.splice(i, 1);
-        continue;
-      }
+  while (_processes.length) {
+    const childProc = _processes.pop();
+    if (!childProc || childProc.pid === undefined) {
+      continue;
     }
 
-    // If still have processes, wait a bit before the next retry (e.g., 100ms)
-    if (_processes.length > 0 && attempts < maxRetries) {
-      await sleep(100);
-    }
+    processesToKill.push(
+      new Promise<void>((resolve) => {
+        treeKill(childProc.pid!, signal, () => {
+          // Ignore all errors.
+          // This is due to a race condition with the `waitForMatch` logic.
+          // where promises are resolved on matches and not when the process terminates.
+          // Also in some cases in windows we get `The operation attempted is not supported`.
+          resolve();
+        });
+      }),
+    );
   }
+
+  await Promise.all(processesToKill);
 }
 
 export function exec(cmd: string, ...args: string[]) {
diff --git a/tests/package.json b/tests/package.json
index 9eb906b8cda5..17660ff2192e 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -2,6 +2,7 @@
   "devDependencies": {
     "@types/tar-stream": "3.1.4",
     "@angular-devkit/schematics": "workspace:*",
-    "tar-stream": "3.1.7"
+    "tar-stream": "3.1.7",
+    "tree-kill": "1.2.2"
   }
 }