diff --git a/backend/src/app.module.ts b/backend/src/app.module.ts
index 85e71da..ed1cdc0 100644
--- a/backend/src/app.module.ts
+++ b/backend/src/app.module.ts
@@ -5,10 +5,10 @@
  */
 
 import { Module } from '@nestjs/common';
-import { ConfigModule } from '@nestjs/config';
+import { ConfigModule, ConfigService } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { ThrottlerModule, ThrottlerGuard } from '@nestjs/throttler';
-import { APP_GUARD } from '@nestjs/core';
+import { APP_GUARD, APP_INTERCEPTOR } from '@nestjs/core';
 
 import { BullModule } from '@nestjs/bull';
 import { envValidationSchema } from './config/env.validation';
diff --git a/backend/src/modules/auth/auth.service.ts b/backend/src/modules/auth/auth.service.ts
index 017d3df..93154c2 100644
--- a/backend/src/modules/auth/auth.service.ts
+++ b/backend/src/modules/auth/auth.service.ts
@@ -14,12 +14,12 @@ import { JwtService } from '@nestjs/jwt';
 import { ConfigService } from '@nestjs/config';
 import { DataSource } from 'typeorm';
 import * as bcrypt from 'bcrypt';
-import { User } from '../../users/entities/user.entity';
-import { Tenant, TenantStatus } from '../../tenants/entities/tenant.entity';
-import { UserRole } from '../../users/enums/role.enum';
+import { User } from '../users/entities/user.entity';
+import { Tenant, TenantStatus } from '../tenants/entities/tenant.entity';
+import { UserRole } from '../users/enums/role.enum';
 import { RegisterDto } from './dto/register.dto';
 import { LoginDto } from './dto/login.dto';
-import { Subscription, SubscriptionPlan, SubscriptionStatus } from '../../subscriptions/entities/subscription.entity';
+import { Subscription, SubscriptionPlan, SubscriptionStatus } from '../subscriptions/entities/subscription.entity';
 
 @Injectable()
 export class AuthService {
diff --git a/backend/src/modules/companies/company.service.ts b/backend/src/modules/companies/company.service.ts
index ae71e50..3088af7 100644
--- a/backend/src/modules/companies/company.service.ts
+++ b/backend/src/modules/companies/company.service.ts
@@ -40,7 +40,7 @@ export class CompaniesService {
     const company = this.companyRepository.create({
       ...dto,
       tenant_id: tenantId,
-    });
+    } as Partial<Company>);
 
     return this.companyRepository.save(company);
   }
diff --git a/backend/src/modules/invoices/gemini-extractor.service.ts b/backend/src/modules/invoices/gemini-extractor.service.ts
index fa05202..f1050d3 100644
--- a/backend/src/modules/invoices/gemini-extractor.service.ts
+++ b/backend/src/modules/invoices/gemini-extractor.service.ts
@@ -82,7 +82,7 @@ export class GeminiExtractorService {
       const cleanedJson = responseText.replace(/```json|```/g, '').trim();
 
       return JSON.parse(cleanedJson);
-    } catch (error) {
+    } catch (error: any) {
       this.logger.error(`AI Extraction failed: ${error.message}`);
       throw new InternalServerErrorException('AI Extraction failed');
     }
diff --git a/backend/src/modules/invoices/jofotara-gateway.service.ts b/backend/src/modules/invoices/jofotara-gateway.service.ts
index b2c88ee..4de7dba 100644
--- a/backend/src/modules/invoices/jofotara-gateway.service.ts
+++ b/backend/src/modules/invoices/jofotara-gateway.service.ts
@@ -50,7 +50,7 @@ export class JoFotaraGatewayService {
       );
 
       return response.data;
-    } catch (error) {
+    } catch (error: any) {
       this.logger.error(`JoFotara API Error: ${error.response?.data || error.message}`);
       throw new InternalServerErrorException(
         `Failed to submit invoice to JoFotara: ${error.response?.data?.message || 'Unknown Error'}`,
@@ -72,7 +72,7 @@ export class JoFotaraGatewayService {
         },
       });
       return response.data;
-    } catch (error) {
+    } catch (error: any) {
       throw new InternalServerErrorException('Failed to check invoice status');
     }
   }
diff --git a/backend/src/modules/users/user.service.ts b/backend/src/modules/users/user.service.ts
index c948b8d..2a53235 100644
--- a/backend/src/modules/users/user.service.ts
+++ b/backend/src/modules/users/user.service.ts
@@ -35,7 +35,7 @@ export class UsersService {
       ...dto,
       password_hash: passwordHash,
       tenant_id: tenantId,
-    });
+    } as Partial<User>);
 
     return this.userRepository.save(user);
   }
diff --git a/backend/tsconfig.build.json b/backend/tsconfig.build.json
index d0979cc..8de12a4 100644
--- a/backend/tsconfig.build.json
+++ b/backend/tsconfig.build.json
@@ -2,7 +2,9 @@
   "extends": "./tsconfig",
   "compilerOptions": {
     "outDir": "./dist",
-    "baseUrl": "./"
+    "baseUrl": "./",
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true
   },
   "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
 }