diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..f06c2d8
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,4 @@
+DATABASE_URL=postgresql://user:password@localhost:5432/dbname
+JWT_SECRET=your_jwt_secret
+JWT_EXPIRY=1h
+PORT=3000
diff --git a/package.json b/package.json
index dda7360..3dd518e 100644
--- a/package.json
+++ b/package.json
@@ -22,10 +22,13 @@
   },
   "homepage": "https://github.com/MindFlowInteractive/logiquest_api#readme",
   "dependencies": {
+    "@nestjs/config": "^3.2.0",
+    "joi": "^17.12.0",
     "@nestjs/common": "^11.1.27",
     "@nestjs/core": "^11.1.27",
     "@nestjs/platform-express": "^11.1.27",
-    "reflect-metadata": "^0.2.2"
+    "reflect-metadata": "^0.2.2",
+    "@nestjs/event-emitter": "^2.0.0"
   },
   "devDependencies": {
     "@nestjs/cli": "^11.0.23",
diff --git a/src/achievements/achievements.module.ts b/src/achievements/achievements.module.ts
new file mode 100644
index 0000000..2f97e4f
--- /dev/null
+++ b/src/achievements/achievements.module.ts
@@ -0,0 +1,17 @@
+import { Module, Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { EventName } from '../events/events.enum';
+import { AchievementUnlockedPayload } from '../events/event-payloads';
+
+@Injectable()
+export class AchievementsListener {
+  @OnEvent(EventName.AchievementUnlocked)
+  async handleAchievementUnlocked(payload: AchievementUnlockedPayload) {
+    console.log('AchievementsListener received AchievementUnlocked:', payload);
+  }
+}
+
+@Module({
+  providers: [AchievementsListener],
+})
+export class AchievementsModule {}
diff --git a/src/app.module.ts b/src/app.module.ts
index 01068c5..ca94f4e 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -1,4 +1,23 @@
 import { Module } from '@nestjs/common';
+import { EventEmitterModule } from '@nestjs/event-emitter';
+import { AppConfigModule } from './config/app-config.module';
+import { EventService } from './events/event.service';
+import { ScoringModule } from './scoring/scoring.module';
+import { AchievementsModule } from './achievements/achievements.module';
+import { RewardsModule } from './rewards/rewards.module';
+import { NotificationsModule } from './notifications/notifications.module';
 
-@Module({})
+@Module({
+  imports: [
+    AppConfigModule,
+    EventEmitterModule.forRoot({
+      global: true,
+    }),
+    ScoringModule,
+    AchievementsModule,
+    RewardsModule,
+    NotificationsModule,
+  ],
+  providers: [EventService],
+})
 export class AppModule {}
diff --git a/src/config/app-config.module.spec.ts b/src/config/app-config.module.spec.ts
new file mode 100644
index 0000000..6145e06
--- /dev/null
+++ b/src/config/app-config.module.spec.ts
@@ -0,0 +1,44 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { ConfigModule } from '@nestjs/config';
+import * as Joi from 'joi';
+
+describe('Config Validation', () => {
+  const configFactory = () =>
+    ConfigModule.forRoot({
+      isGlobal: true,
+      validationSchema: Joi.object({
+        DATABASE_URL: Joi.string().required(),
+        JWT_SECRET: Joi.string().required(),
+        JWT_EXPIRY: Joi.string().required(),
+        PORT: Joi.number().required(),
+      }),
+    });
+
+  it('should fail when required env vars are missing', async () => {
+    // Clear env vars
+    delete process.env.DATABASE_URL;
+    delete process.env.JWT_SECRET;
+    delete process.env.JWT_EXPIRY;
+    delete process.env.PORT;
+
+    await expect(
+      Test.createTestingModule({
+        imports: [configFactory()],
+      }).compile(),
+    ).rejects.toThrow();
+  });
+
+  it('should succeed when all required env vars are provided', async () => {
+    process.env.DATABASE_URL = 'postgres://test';
+    process.env.JWT_SECRET = 'secret';
+    process.env.JWT_EXPIRY = '1h';
+    process.env.PORT = '3000';
+
+    const moduleRef: TestingModule = await Test.createTestingModule({
+      imports: [configFactory()],
+    }).compile();
+
+    expect(moduleRef).toBeDefined();
+    await moduleRef.close();
+  });
+});
diff --git a/src/config/app-config.module.ts b/src/config/app-config.module.ts
new file mode 100644
index 0000000..55cd370
--- /dev/null
+++ b/src/config/app-config.module.ts
@@ -0,0 +1,19 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule as NestConfigModule } from '@nestjs/config';
+import * as Joi from 'joi';
+
+@Module({
+  imports: [
+    NestConfigModule.forRoot({
+      isGlobal: true,
+      validationSchema: Joi.object({
+        DATABASE_URL: Joi.string().required(),
+        JWT_SECRET: Joi.string().required(),
+        JWT_EXPIRY: Joi.string().required(),
+        PORT: Joi.number().required(),
+      }),
+    }),
+  ],
+  exports: [NestConfigModule],
+})
+export class AppConfigModule {}
diff --git a/src/events/event-payloads.ts b/src/events/event-payloads.ts
new file mode 100644
index 0000000..c77dfb7
--- /dev/null
+++ b/src/events/event-payloads.ts
@@ -0,0 +1,20 @@
+export interface SessionCompletedPayload {
+  sessionId: string;
+  userId: string;
+  // any other relevant fields
+}
+
+export interface ScoreUpdatedPayload {
+  sessionId: string;
+  newScore: number;
+}
+
+export interface AchievementUnlockedPayload {
+  userId: string;
+  achievementId: string;
+}
+
+export interface RewardGrantedPayload {
+  userId: string;
+  rewardId: string;
+}
diff --git a/src/events/event.service.ts b/src/events/event.service.ts
new file mode 100644
index 0000000..6c474e7
--- /dev/null
+++ b/src/events/event.service.ts
@@ -0,0 +1,12 @@
+import { Injectable } from '@nestjs/common';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { EventName } from './events.enum';
+
+@Injectable()
+export class EventService {
+  constructor(private readonly eventEmitter: EventEmitter2) {}
+
+  emit<T>(event: EventName, payload: T): void {
+    this.eventEmitter.emit(event, payload);
+  }
+}
diff --git a/src/events/events.enum.ts b/src/events/events.enum.ts
new file mode 100644
index 0000000..2d569ef
--- /dev/null
+++ b/src/events/events.enum.ts
@@ -0,0 +1,6 @@
+export enum EventName {
+  SessionCompleted = 'session.completed',
+  ScoreUpdated = 'score.updated',
+  AchievementUnlocked = 'achievement.unlocked',
+  RewardGranted = 'reward.granted',
+}
diff --git a/src/main.ts b/src/main.ts
index 747b613..c631b19 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,9 +1,11 @@
 import { NestFactory } from '@nestjs/core';
 import type { NestExpressApplication } from '@nestjs/platform-express';
 import { AppModule } from './app.module';
+import { ConfigService } from '@nestjs/config';
 
 async function bootstrap() {
-  const app = await NestFactory.create<NestExpressApplication>(AppModule);
-  await app.listen(process.env.PORT || 3000);
+  const configService = app.get(ConfigService);
+  const port = configService.get<number>('PORT') || 3000;
+  await app.listen(port);
 }
 bootstrap();
diff --git a/src/notifications/notifications.module.ts b/src/notifications/notifications.module.ts
new file mode 100644
index 0000000..9dbaa84
--- /dev/null
+++ b/src/notifications/notifications.module.ts
@@ -0,0 +1,17 @@
+import { Module, Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { EventName } from '../events/events.enum';
+import { SessionCompletedPayload } from '../events/event-payloads';
+
+@Injectable()
+export class NotificationsListener {
+  @OnEvent(EventName.SessionCompleted)
+  async handleSessionCompleted(payload: SessionCompletedPayload) {
+    console.log('NotificationsListener received SessionCompleted:', payload);
+  }
+}
+
+@Module({
+  providers: [NotificationsListener],
+})
+export class NotificationsModule {}
diff --git a/src/rewards/rewards.module.ts b/src/rewards/rewards.module.ts
new file mode 100644
index 0000000..5715df9
--- /dev/null
+++ b/src/rewards/rewards.module.ts
@@ -0,0 +1,17 @@
+import { Module, Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { EventName } from '../events/events.enum';
+import { RewardGrantedPayload } from '../events/event-payloads';
+
+@Injectable()
+export class RewardsListener {
+  @OnEvent(EventName.RewardGranted)
+  async handleRewardGranted(payload: RewardGrantedPayload) {
+    console.log('RewardsListener received RewardGranted:', payload);
+  }
+}
+
+@Module({
+  providers: [RewardsListener],
+})
+export class RewardsModule {}
diff --git a/src/scoring/scoring.module.ts b/src/scoring/scoring.module.ts
new file mode 100644
index 0000000..0f6c9e3
--- /dev/null
+++ b/src/scoring/scoring.module.ts
@@ -0,0 +1,18 @@
+import { Module, Injectable } from '@nestjs/common';
+import { OnEvent } from '@nestjs/event-emitter';
+import { EventName } from '../events/events.enum';
+import { ScoreUpdatedPayload } from '../events/event-payloads';
+
+@Injectable()
+export class ScoringListener {
+  @OnEvent(EventName.ScoreUpdated)
+  async handleScoreUpdated(payload: ScoreUpdatedPayload) {
+    // Placeholder implementation
+    console.log('ScoringListener received ScoreUpdated:', payload);
+  }
+}
+
+@Module({
+  providers: [ScoringListener],
+})
+export class ScoringModule {}