diff --git a/msa/js-executor/pom.xml b/msa/js-executor/pom.xml
index f5ea04fac3..58404c0152 100644
--- a/msa/js-executor/pom.xml
+++ b/msa/js-executor/pom.xml
@@ -52,6 +52,29 @@
             <type>exe</type>
             <scope>provided</scope>
         </dependency>
+        <!--
+            Reactor-only ordering dep (NOT a real classpath dependency).
+            Forces `mvn -T<n>` to serialize this module after web-ui so that
+            no two `yarn install` / `yarn run pkg` invocations can overlap on
+            the same agent. Concurrent yarn 1.x processes share ~/.cache/yarn
+            and have intermittently produced `tsc: not found` failures during
+            yarn pkg (incomplete typescript extraction in node_modules).
+            The chain is: ui-ngx -> msa/web-ui -> msa/js-executor.
+            type=pom + provided + wildcard exclusions keep nothing on the classpath.
+        -->
+        <dependency>
+            <groupId>org.thingsboard.msa</groupId>
+            <artifactId>web-ui</artifactId>
+            <version>${project.version}</version>
+            <type>pom</type>
+            <scope>provided</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>*</groupId>
+                    <artifactId>*</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
     </dependencies>
 
     <build>
@@ -90,7 +113,7 @@
                         </goals>
                         <phase>compile</phase>
                         <configuration>
-                            <arguments>run pkg</arguments>
+                            <arguments>--mutex network run pkg</arguments>
                         </configuration>
                     </execution>
                 </executions>
diff --git a/msa/pom.xml b/msa/pom.xml
index ac7b7b70c3..84c98308cd 100644
--- a/msa/pom.xml
+++ b/msa/pom.xml
@@ -44,7 +44,16 @@
     </properties>
 
     <modules>
-        <!--Modules order is important to speedup parallel build and avoid yarn pgk parallel execution-->
+        <!--
+            Module order below is informational only. Yarn-using modules
+            (web-ui, js-executor) are serialized via reactor-only
+            <dependency> entries in their own poms, forming the chain
+            ui-ngx -> web-ui -> js-executor. This prevents
+            concurrent yarn install / yarn run pkg invocations under `mvn -T<n>`,
+            which previously caused intermittent `tsc: not found` failures
+            (incomplete typescript extraction in node_modules from racing
+            yarn 1.x processes against the shared ~/.cache/yarn).
+        -->
         <module>tb</module>
         <module>web-ui</module>
         <module>vc-executor</module>
diff --git a/msa/web-ui/pom.xml b/msa/web-ui/pom.xml
index 00c1703dcd..196311f880 100644
--- a/msa/web-ui/pom.xml
+++ b/msa/web-ui/pom.xml
@@ -99,7 +99,7 @@
                         </goals>
                         <phase>compile</phase>
                         <configuration>
-                            <arguments>run pkg</arguments>
+                            <arguments>--mutex network run pkg</arguments>
                         </configuration>
                     </execution>
                 </executions>
diff --git a/ui-ngx/pom.xml b/ui-ngx/pom.xml
index cc58f728a0..4bc4bfd6cd 100644
--- a/ui-ngx/pom.xml
+++ b/ui-ngx/pom.xml
@@ -106,7 +106,7 @@
                                     <goal>yarn</goal>
                                 </goals>
                                 <configuration>
-                                    <arguments>run build:prod</arguments>
+                                    <arguments>--mutex network run build:prod</arguments>
                                 </configuration>
                             </execution>
                         </executions>