diff --git a/src/engine/engine.js b/src/engine/engine.js
index 18e778b..fece1c8 100644
--- a/src/engine/engine.js
+++ b/src/engine/engine.js
@@ -18,7 +18,7 @@ const { ProcessStatus } = require("./../core/workflow/process_state");
 const { validateTimeInterval } = require("../core/utils/ajvValidator");
 const { validate: uuidValidate } = require("uuid");
 const { readEnvironmentVariableAsBool, readEnvironmentVariableAsNumber } = require("../core/utils/environment");
-const { engineHeartBeat } = require("./heartbeat/base");
+const { engineHeartBeat, getBeatInstances } = require("./heartbeat/base");
 
 function getActivityManagerFromData(activity_manager_data) {
   const activity_manager = ActivityManager.deserialize(activity_manager_data);
@@ -75,6 +75,8 @@ class Engine {
     Engine.instance = this;
     this.emitter = emitter;
     if (heartBeat) {
+      Engine.instance.beat_instances = getBeatInstances();
+      Engine.instance.current_instance = Engine.instance?.beat_instances?.[0];
       Engine.beat = engineHeartBeat;
       if (process.env.TIMER_BATCH && process.env.TIMER_BATCH > 0 && process.env.TIMER_QUEUE) {
         emitter.emit("ENGINE.CONTRUCTOR", "BOTH BATCH AND QUEUE ACTIVE", {
@@ -96,7 +98,7 @@ class Engine {
   static setNextHeartBeat() {
     return setTimeout(async () => {
       try {
-        await Engine._beat();
+        await Engine._beat(Engine.instance);
       } catch (e) {
         emitter.emit("ENGINE.HEART.ERROR", `HEART FAILURE @ ENGINE_ID [${ENGINE_ID}]`, {
           engine_id: ENGINE_ID,
diff --git a/src/engine/heartbeat/base.js b/src/engine/heartbeat/base.js
index 9099cd8..e62b2d4 100644
--- a/src/engine/heartbeat/base.js
+++ b/src/engine/heartbeat/base.js
@@ -1,14 +1,42 @@
+require("dotenv").config();
 const emitter = require("../../core/utils/emitter");
 const { timerHeartBeat } = require("./timer");
 const { processHeartBeat } = require("./process");
+const { readEnvironmentVariableAsNumber } = require("../../core/utils/environment");
 
-const engineHeartBeat = async () => {
+const engineHeartBeat = async (engine) => {
   emitter.emit("ENGINE.HEARTBEAT", `HEARTBEAT @ [${new Date().toISOString()}]`);
+  const TIMER_BATCH = readEnvironmentVariableAsNumber("TIMER_BATCH", 0);
+  const PROCESS_BATCH = readEnvironmentVariableAsNumber("PROCESS_BATCH", 0);
 
-  await timerHeartBeat();
-  await processHeartBeat();
+  if (engine?.current_instance === 'TIMER') {
+    await timerHeartBeat(TIMER_BATCH);
+  } else if (engine?.current_instance === 'PROCESS') {
+    await processHeartBeat(PROCESS_BATCH);
+  }
+
+  if (engine?.beat_instances?.length === 2) {
+    engine.current_instance = engine?.current_instance === 'PROCESS' ? 'TIMER' : 'PROCESS';
+  }
+}
+
+const getBeatInstances = () => {
+  const TIMER_BATCH = readEnvironmentVariableAsNumber("TIMER_BATCH", 0);
+  const PROCESS_BATCH = readEnvironmentVariableAsNumber("PROCESS_BATCH", 0);
+  const beatInstances = [];
+
+  if (TIMER_BATCH > 0) {
+    beatInstances.push("TIMER");
+  }
+
+  if (PROCESS_BATCH > 0) {
+    beatInstances.push("PROCESS");
+  }
+
+  return beatInstances;
 }
 
 module.exports = {
   engineHeartBeat,
+  getBeatInstances,
 }
\ No newline at end of file
diff --git a/src/engine/heartbeat/process.js b/src/engine/heartbeat/process.js
index e3055be..9356870 100644
--- a/src/engine/heartbeat/process.js
+++ b/src/engine/heartbeat/process.js
@@ -3,8 +3,8 @@ const emitter = require("../../core/utils/emitter");
 const { Process } = require("../../core/workflow/process");
 const { ProcessState } = require("../../core/workflow/process_state");
 
-const processHeartBeat = async () => {
-  const PROCESS_BATCH = process.env.PROCESS_BATCH || 10;
+const processHeartBeat = async (PROCESS_BATCH) => {
+  emitter.emit("ENGINE.HEARTBEAT", `HEARTBEAT INSTANCE PROCESS`);
   const processes = await Process.getPersist()._db.transaction(async (trx) => {
     try {
       emitter.emit("ENGINE.PROCESSES_FETCHING", `  FETCHING PROCESSES ON HEARTBEAT BATCH [${PROCESS_BATCH}]`);
diff --git a/src/engine/heartbeat/tests/heartbeat.test.js b/src/engine/heartbeat/tests/heartbeat.test.js
new file mode 100644
index 0000000..e4d93dd
--- /dev/null
+++ b/src/engine/heartbeat/tests/heartbeat.test.js
@@ -0,0 +1,110 @@
+const settings = require("../../../../settings/tests/settings");
+const { PersistorProvider } = require("../../../core/persist/provider");
+const { Process } = require("../../../core/workflow/process");
+const { processHeartBeat } = require("../process");
+const { timerHeartBeat } = require("../timer");
+const { engineHeartBeat, getBeatInstances } = require("../base");
+
+jest.mock("../process", () => {
+  const actualModule = jest.requireActual("../process");
+  return {
+    ...actualModule,
+    processHeartBeat: jest.spyOn(actualModule, "processHeartBeat"),
+  };
+});
+
+jest.mock("../timer", () => {
+  const actualModule = jest.requireActual("../timer");
+  return {
+    ...actualModule,
+    timerHeartBeat: jest.spyOn(actualModule, "timerHeartBeat"),
+  };
+});
+
+beforeEach(async () => {
+  await _clean();
+});
+
+afterAll(async () => {
+  await _clean();
+  if (settings.persist_options[0] === "knex") {
+    await Process.getPersist()._db.destroy();
+  }
+});
+
+test("engineHeartBeat runs only for TIMER when current_instance=TIMER", async () => {
+  const minimalEngine = {
+    current_instance: 'TIMER',
+  }
+  await engineHeartBeat(minimalEngine);
+
+  expect(timerHeartBeat).toHaveBeenCalled();
+  expect(processHeartBeat).not.toHaveBeenCalled();
+});
+
+test("engineHeartBeat runs only for PROCESS when current_instance=PROCESS", async () => {
+  const minimalEngine = {
+    current_instance: 'PROCESS',
+  }
+  await engineHeartBeat(minimalEngine);
+
+  expect(processHeartBeat).toHaveBeenCalled();
+  expect(timerHeartBeat).not.toHaveBeenCalled();
+});
+
+test("engineHeartBeat runs for both TIMER and PROCESS when beat_instances length is 2", async () => {
+  const minimalEngine = {
+    current_instance: 'TIMER',
+    beat_instances: ['TIMER' , 'PROCESS'],
+  }
+
+  await engineHeartBeat(minimalEngine);
+  await engineHeartBeat(minimalEngine);
+
+  expect(processHeartBeat).toHaveBeenCalled();
+  expect(timerHeartBeat).toHaveBeenCalled();
+});
+
+test("getBeatInstances runs for TIMER_BATCH = 10", async () => {
+  process.env.TIMER_BATCH = 10;
+
+  const beatInstances = getBeatInstances();
+
+  expect(beatInstances).toHaveLength(1);
+  process.env.TIMER_BATCH = 0;
+});
+
+test("getBeatInstances runs for PROCESS_BATCH = 10", async () => {
+  process.env.PROCESS_BATCH = 10;
+
+  const beatInstances = getBeatInstances();
+
+  expect(beatInstances).toHaveLength(1);
+  process.env.PROCESS_BATCH = 0;
+});
+
+test("getBeatInstances runs for TIMER_BATCH = 10 and PROCESS_BATCH = 10", async () => {
+  process.env.TIMER_BATCH = 10;
+  process.env.PROCESS_BATCH = 10;
+
+  const beatInstances = getBeatInstances();
+
+  expect(beatInstances).toHaveLength(2);
+});
+
+const _clean = async () => {
+  const persistor = PersistorProvider.getPersistor(...settings.persist_options);
+  const activity_persist = persistor.getPersistInstance("Activity");
+  const activity_manager_persist = persistor.getPersistInstance("ActivityManager");
+  const process_state_persist = persistor.getPersistInstance("ProcessState");
+  const process_persist = persistor.getPersistInstance("Process");
+  const workflow_persist = persistor.getPersistInstance("Workflow");
+  const timer_persist = persistor.getPersistInstance("Timer");
+
+  await activity_persist.deleteAll();
+  await activity_manager_persist.deleteAll();
+  await process_state_persist.deleteAll();
+  await process_persist.deleteAll();
+  await workflow_persist.deleteAll();
+  await timer_persist.deleteAll();
+};
\ No newline at end of file
diff --git a/src/engine/heartbeat/timer.js b/src/engine/heartbeat/timer.js
index 69f9a31..7f60c51 100644
--- a/src/engine/heartbeat/timer.js
+++ b/src/engine/heartbeat/timer.js
@@ -1,8 +1,8 @@
 const emitter = require("../../core/utils/emitter");
 const { Timer } = require("../../core/workflow/timer");
 
-const timerHeartBeat = async () => {
-  const TIMER_BATCH = process.env.TIMER_BATCH || 40;
+const timerHeartBeat = async (TIMER_BATCH) => {
+  emitter.emit("ENGINE.HEARTBEAT", `HEARTBEAT INSTANCE TIMER`);
 
   const max_connection_pool = Timer.getPersist()._db.context.client.pool.max
   const connections = Timer.getPersist()._db.context.client.pool.free.length