diff --git a/src/modules/task-manager/providers/task.service.ts b/src/modules/task-manager/providers/task.service.ts
new file mode 100644
index 0000000..9e635e3
--- /dev/null
+++ b/src/modules/task-manager/providers/task.service.ts
@@ -0,0 +1,100 @@
+import { BadRequestException, Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { In, Repository } from 'typeorm';
+import { TaskRepository } from '../repositories/task.repository';
+import { TaskPhaseRepository } from '../repositories/task-phase.repository';
+import { TMTask } from '../entities/task.entity';
+import { CreateTaskDto } from '../dto/task/create-task.dto';
+import { UpdateTaskDto } from '../dto/task/update-task.dto';
+import { ChangeTaskPhaseDto } from '../dto/task/change-task-phase.dto';
+import { User } from '../../users/entities/user.entity';
+
+@Injectable()
+export class TaskService {
+  constructor(
+    private readonly taskRepository: TaskRepository,
+    private readonly taskPhaseRepository: TaskPhaseRepository,
+    @InjectRepository(User)
+    private readonly userRepository: Repository<User>,
+  ) {}
+
+  findAll(): Promise<TMTask[]> {
+    return this.taskRepository.findAll();
+  }
+
+  findByPhase(taskPhaseId: string): Promise<TMTask[]> {
+    return this.taskRepository.findByPhase(taskPhaseId);
+  }
+
+  async findOne(id: string): Promise<TMTask> {
+    const task = await this.taskRepository.findOneById(id);
+    if (!task) throw new NotFoundException(`Task #${id} not found`);
+    return task;
+  }
+
+  async create(dto: CreateTaskDto): Promise<TMTask> {
+    const { userIds, startDate, endDate, ...rest } = dto;
+
+    const taskPhase = await this.taskPhaseRepository.findOneById(dto.taskPhaseId);
+    if (!taskPhase) throw new NotFoundException(`TaskPhase #${dto.taskPhaseId} not found`);
+
+    const task = this.taskRepository.create({
+      ...rest,
+      startDate: startDate ? new Date(startDate) : undefined,
+      endDate: endDate ? new Date(endDate) : undefined,
+    });
+
+    if (userIds?.length) {
+      task.users = await this.userRepository.findBy({ id: In(userIds) });
+    }
+
+    return this.taskRepository.save(task);
+  }
+
+  async update(id: string, dto: UpdateTaskDto): Promise<TMTask> {
+    const task = await this.findOne(id);
+    const { userIds, startDate, endDate, ...rest } = dto;
+
+    if (dto.taskPhaseId) {
+      const taskPhase = await this.taskPhaseRepository.findOneById(dto.taskPhaseId);
+      if (!taskPhase) throw new NotFoundException(`TaskPhase #${dto.taskPhaseId} not found`);
+    }
+
+    Object.assign(task, {
+      ...rest,
+      startDate: startDate ? new Date(startDate) : task.startDate,
+      endDate: endDate ? new Date(endDate) : task.endDate,
+    });
+
+    if (userIds) {
+      task.users = userIds.length
+        ? await this.userRepository.findBy({ id: In(userIds) })
+        : [];
+    }
+
+    return this.taskRepository.save(task);
+  }
+
+  async changePhase(id: string, dto: ChangeTaskPhaseDto): Promise<TMTask> {
+    const task = await this.findOne(id);
+
+    const newPhase = await this.taskPhaseRepository.findOneById(dto.taskPhaseId);
+    if (!newPhase) throw new NotFoundException(`TaskPhase #${dto.taskPhaseId} not found`);
+
+    if (task.taskPhase.projectId !== newPhase.projectId) {
+      throw new BadRequestException(
+        `TaskPhase #${dto.taskPhaseId} does not belong to the same project as the current phase`,
+      );
+    }
+
+    task.taskPhaseId = dto.taskPhaseId;
+    task.taskPhase = newPhase;
+
+    return this.taskRepository.save(task);
+  }
+
+  async remove(id: string): Promise<void> {
+    await this.findOne(id);
+    await this.taskRepository.delete(id);
+  }
+}
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