Add optional assignee to task form

backend/src/main/java/net/beetechgroup/beetask/frameworks/config/OrganizationUseCaseConfig.java

@@ -9,6 +9,7 @@ import net.beetechgroup.beetask.usecase.organization.requests.ListPendingRequest
 import net.beetechgroup.beetask.usecase.organization.requests.ListUserJoinRequestsUseCase;
 import net.beetechgroup.beetask.usecase.organization.requests.HandleJoinRequestUseCase;
 import net.beetechgroup.beetask.usecase.organization.auth.AuthorizeOrganizationAdminUseCase;
+import net.beetechgroup.beetask.usecase.organization.members.ListOrganizationMembersUseCase;
 import net.beetechgroup.beetask.usecase.repository.OrganizationRepository;
 import net.beetechgroup.beetask.usecase.repository.UserOrganizationRepository;
 import net.beetechgroup.beetask.usecase.repository.UserRepository;
@@ -58,4 +59,10 @@ public class OrganizationUseCaseConfig {
                                                                  UserRepository userRepository) {
         return new ListUserJoinRequestsUseCase(userOrganizationRepository, userRepository);
     }
-}
+
+    @Produces
+    public ListOrganizationMembersUseCase listOrganizationMembersUseCase(UserRepository userRepository,
+                                                                         UserOrganizationRepository userOrganizationRepository) {
+        return new ListOrganizationMembersUseCase(userRepository, userOrganizationRepository);
+    }
+}

backend/src/main/java/net/beetechgroup/beetask/frameworks/config/TaskUseCaseConfig.java

@@ -5,6 +5,7 @@ import jakarta.enterprise.inject.Produces;
 import net.beetechgroup.beetask.usecase.repository.CategoryRepository;
 import net.beetechgroup.beetask.usecase.repository.ProjectRepository;
 import net.beetechgroup.beetask.usecase.repository.TaskRepository;
+import net.beetechgroup.beetask.usecase.repository.UserOrganizationRepository;
 import net.beetechgroup.beetask.usecase.repository.UserRepository;
 import net.beetechgroup.beetask.usecase.task.create.CreateTaskUseCase;
 import net.beetechgroup.beetask.usecase.task.listall.ListAllTasksUseCase;
@@ -20,8 +21,9 @@ public class TaskUseCaseConfig {
 
     @Produces
     public CreateTaskUseCase createTaskUseCase(TaskRepository taskRepository, ProjectRepository projectRepository,
-                                                CategoryRepository categoryRepository, UserRepository userRepository) {
+                                                CategoryRepository categoryRepository, UserRepository userRepository,
-        return new CreateTaskUseCase(taskRepository, projectRepository, categoryRepository, userRepository);
+                                                UserOrganizationRepository userOrganizationRepository) {
+        return new CreateTaskUseCase(taskRepository, projectRepository, categoryRepository, userRepository, userOrganizationRepository);
     }
 
     @Produces
@@ -51,8 +53,9 @@ public class TaskUseCaseConfig {
 
     @Produces
     public UpdateTaskUseCase updateTaskUseCase(TaskRepository taskRepository, ProjectRepository projectRepository,
-                                                CategoryRepository categoryRepository, UserRepository userRepository) {
+                                                CategoryRepository categoryRepository, UserRepository userRepository,
-        return new UpdateTaskUseCase(taskRepository, projectRepository, categoryRepository, userRepository);
+                                                UserOrganizationRepository userOrganizationRepository) {
+        return new UpdateTaskUseCase(taskRepository, projectRepository, categoryRepository, userRepository, userOrganizationRepository);
     }
 
     @Produces

backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/organization/OrganizationController.java

@@ -21,6 +21,8 @@ import net.beetechgroup.beetask.usecase.organization.requests.ListUserJoinReques
 import net.beetechgroup.beetask.usecase.organization.requests.UserJoinRequestOutput;
 import net.beetechgroup.beetask.usecase.organization.requests.JoinRequestOutput;
 import net.beetechgroup.beetask.usecase.organization.requests.HandleJoinRequestUseCase;
+import net.beetechgroup.beetask.usecase.organization.members.ListOrganizationMembersUseCase;
+import net.beetechgroup.beetask.usecase.organization.members.OrganizationMemberOutput;
 import org.jboss.logging.Logger;
 
 import java.util.List;
@@ -47,6 +49,9 @@ public class OrganizationController {
     @Inject
     HandleJoinRequestUseCase handleJoinRequestUseCase;
 
+    @Inject
+    ListOrganizationMembersUseCase listOrganizationMembersUseCase;
+
     @Inject
     SecurityIdentity securityIdentity;
 
@@ -116,6 +121,17 @@ public class OrganizationController {
         LOGGER.infof("Join request rejected for user %d in organization %d by %s", userId, organizationId, userEmail);
     }
 
+    @GET
+    @Path("/{id}/members")
+    @Authenticated
+    @Operation(summary = "List organization members", description = "List all active members of an organization")
+    public List<OrganizationMemberOutput> listMembers(@PathParam("id") Long organizationId) {
+        String userEmail = securityIdentity.getPrincipal().getName();
+        List<OrganizationMemberOutput> members = listOrganizationMembersUseCase.execute(userEmail, organizationId);
+        LOGGER.infof("User %s listed %d active members for organization %d", userEmail, members.size(), organizationId);
+        return members;
+    }
+
     @GET
     @Path("/my-requests")
     @Authenticated

backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/task/CreateTaskRequest.java

@@ -8,7 +8,9 @@ public record CreateTaskRequest(
                 String title,
                 String description,
                 TaskStatus status,
+                Long organizationId,
                 Long projectId,
                 Long categoryId,
+                Long assigneeUserId,
                 List<TaskHistoryItemResponse> history) {
 }

backend/src/main/java/net/beetechgroup/beetask/interfaceadapters/controllers/task/TaskControllerMapper.java

@@ -33,8 +33,10 @@ public class TaskControllerMapper {
                 request.title(),
                 request.description(),
                 request.status(),
+                request.organizationId(),
                 request.projectId(),
                 request.categoryId(),
+                request.assigneeUserId(),
                 userEmail,
                 Objects.nonNull(request.history()) ? request.history().stream()
                         .map(h -> new TaskHistoryItemInput(h.id(), h.startAt(), h.endAt()))
@@ -85,8 +87,10 @@ public class TaskControllerMapper {
                 request.title(),
                 request.description(),
                 request.status(),
+                request.organizationId(),
                 request.projectId(),
                 request.categoryId(),
+                request.assigneeUserId(),
                 userEmail,
                 Objects.nonNull(request.history()) ? request.history().stream()
                         .map(h -> new TaskHistoryItemInput(h.id(), h.startAt(), h.endAt()))

backend/src/main/java/net/beetechgroup/beetask/usecase/organization/members/ListOrganizationMembersUseCase.java

@@ -0,0 +1,47 @@
+package net.beetechgroup.beetask.usecase.organization.members;
+
+import java.util.List;
+
+import net.beetechgroup.beetask.entities.organization.UserOrganizationStatus;
+import net.beetechgroup.beetask.usecase.repository.UserOrganizationRepository;
+import net.beetechgroup.beetask.usecase.repository.UserRepository;
+import org.jboss.logging.Logger;
+
+public class ListOrganizationMembersUseCase {
+    private static final Logger LOGGER = Logger.getLogger(ListOrganizationMembersUseCase.class);
+
+    private final UserRepository userRepository;
+    private final UserOrganizationRepository userOrganizationRepository;
+
+    public ListOrganizationMembersUseCase(UserRepository userRepository,
+                                          UserOrganizationRepository userOrganizationRepository) {
+        this.userRepository = userRepository;
+        this.userOrganizationRepository = userOrganizationRepository;
+    }
+
+    public List<OrganizationMemberOutput> execute(String userEmail, Long organizationId) {
+        var requester = userRepository.findByEmail(userEmail)
+                .orElseThrow(() -> new IllegalArgumentException("Usuário não encontrado: " + userEmail));
+
+        boolean belongsToOrganization = userRepository.findUserOrganizations(requester.getId()).stream()
+                .anyMatch(membership -> membership.getOrganization().getId().equals(organizationId));
+
+        if (!belongsToOrganization) {
+            LOGGER.warnf("User %s attempted to list members of organization %d without membership", userEmail, organizationId);
+            throw new SecurityException("Você não tem permissão para listar membros desta organização.");
+        }
+
+        List<OrganizationMemberOutput> members = userOrganizationRepository
+                .findByOrganizationIdAndStatus(organizationId, UserOrganizationStatus.ACTIVE)
+                .stream()
+                .map(membership -> new OrganizationMemberOutput(
+                        membership.getUser().getId(),
+                        membership.getUser().getName(),
+                        membership.getUser().getEmail(),
+                        membership.getUser().getPhoto()))
+                .toList();
+
+        LOGGER.infof("Loaded %d active members for organization %d requested by %s", members.size(), organizationId, userEmail);
+        return members;
+    }
+}

backend/src/main/java/net/beetechgroup/beetask/usecase/organization/members/OrganizationMemberOutput.java

@@ -0,0 +1,7 @@
+package net.beetechgroup.beetask.usecase.organization.members;
+
+public record OrganizationMemberOutput(
+        Long userId,
+        String userName,
+        String userEmail,
+        String userPhoto) {}

backend/src/main/java/net/beetechgroup/beetask/usecase/task/create/CreateTaskInput.java

@@ -8,8 +8,10 @@ public record CreateTaskInput(
         String title,
         String description,
         TaskStatus status,
+        Long organizationId,
         Long projectId,
         Long categoryId,
+        Long assigneeUserId,
         String userEmail,
         List<TaskHistoryItemInput> history) {
 }

backend/src/main/java/net/beetechgroup/beetask/usecase/task/create/CreateTaskUseCase.java

@@ -4,8 +4,11 @@ import java.util.List;
 import java.util.Objects;
 import net.beetechgroup.beetask.entities.Category;
 import net.beetechgroup.beetask.entities.Project;
+import net.beetechgroup.beetask.entities.User;
+import net.beetechgroup.beetask.entities.organization.UserOrganizationStatus;
 import net.beetechgroup.beetask.entities.task.Task;
 import net.beetechgroup.beetask.entities.task.TaskHistoryItem;
+import net.beetechgroup.beetask.usecase.repository.UserOrganizationRepository;
 import net.beetechgroup.beetask.usecase.repository.CategoryRepository;
 import net.beetechgroup.beetask.usecase.repository.ProjectRepository;
 import net.beetechgroup.beetask.usecase.repository.TaskRepository;
@@ -18,13 +21,16 @@ public class CreateTaskUseCase {
     private final ProjectRepository projectRepository;
     private final CategoryRepository categoryRepository;
     private final UserRepository userRepository;
+    private final UserOrganizationRepository userOrganizationRepository;
 
     public CreateTaskUseCase(TaskRepository taskRepository, ProjectRepository projectRepository,
-                              CategoryRepository categoryRepository, UserRepository userRepository) {
+                              CategoryRepository categoryRepository, UserRepository userRepository,
+                              UserOrganizationRepository userOrganizationRepository) {
         this.taskRepository = taskRepository;
         this.projectRepository = projectRepository;
         this.categoryRepository = categoryRepository;
         this.userRepository = userRepository;
+        this.userOrganizationRepository = userOrganizationRepository;
     }
 
     public CreateTaskOutput execute(CreateTaskInput input) {
@@ -52,11 +58,8 @@ public class CreateTaskUseCase {
             task.setCategory(category);
         }
 
-        task.setUser(userRepository.findByEmail(input.userEmail())
+        validateRequesterMembership(input.organizationId(), input.userEmail());
-                .orElseThrow(() -> {
+        task.setUser(resolveAssignee(input.organizationId(), input.assigneeUserId()));
-                    LOGGER.warnf("Task creation failed because user %s was not found", input.userEmail());
-                    return new IllegalArgumentException("Usuário não encontrado: " + input.userEmail());
-                }));
 
         if (Objects.nonNull(input.history())) {
             List<TaskHistoryItem> historyItems = input.history().stream().map(h -> {
@@ -72,4 +75,46 @@ public class CreateTaskUseCase {
         LOGGER.infof("Task %d created for user %s", output.id(), input.userEmail());
         return output;
     }
+
+    private void validateRequesterMembership(Long organizationId, String userEmail) {
+        if (Objects.isNull(organizationId)) {
+            throw new IllegalArgumentException("Organização é obrigatória para criar a tarefa.");
+        }
+
+        User requester = userRepository.findByEmail(userEmail)
+                .orElseThrow(() -> {
+                    LOGGER.warnf("Task creation failed because user %s was not found", userEmail);
+                    return new IllegalArgumentException("Usuário não encontrado: " + userEmail);
+                });
+
+        boolean belongsToOrganization = userRepository.findUserOrganizations(requester.getId()).stream()
+                .anyMatch(membership -> membership.getOrganization().getId().equals(organizationId));
+
+        if (!belongsToOrganization) {
+            LOGGER.warnf("Task creation denied because user %s is not an active member of organization %d", userEmail, organizationId);
+            throw new SecurityException("Você não tem permissão para criar tarefas nesta organização.");
+        }
+    }
+
+    private User resolveAssignee(Long organizationId, Long assigneeUserId) {
+        if (Objects.isNull(assigneeUserId)) {
+            return null;
+        }
+
+        boolean belongsToOrganization = userOrganizationRepository
+                .findByOrganizationIdAndStatus(organizationId, UserOrganizationStatus.ACTIVE)
+                .stream()
+                .anyMatch(membership -> membership.getUser().getId().equals(assigneeUserId));
+
+        if (!belongsToOrganization) {
+            LOGGER.warnf("Task creation failed because assignee %d is not an active member of organization %d", assigneeUserId, organizationId);
+            throw new IllegalArgumentException("Responsável não pertence à organização selecionada.");
+        }
+
+        return userRepository.findUserById(assigneeUserId)
+                .orElseThrow(() -> {
+                    LOGGER.warnf("Task creation failed because assignee %d was not found", assigneeUserId);
+                    return new IllegalArgumentException("Usuário responsável não encontrado: " + assigneeUserId);
+                });
+    }
 }

backend/src/main/java/net/beetechgroup/beetask/usecase/task/update/UpdateTaskInput.java

@@ -8,8 +8,10 @@ public record UpdateTaskInput(
         String title,
         String description,
         TaskStatus status,
+        Long organizationId,
         Long projectId,
         Long categoryId,
+        Long assigneeUserId,
         String userEmail,
         List<TaskHistoryItemInput> history) {
 }

backend/src/main/java/net/beetechgroup/beetask/usecase/task/update/UpdateTaskUseCase.java

@@ -4,11 +4,14 @@ import java.util.List;
 import java.util.Objects;
 import net.beetechgroup.beetask.entities.Category;
 import net.beetechgroup.beetask.entities.Project;
+import net.beetechgroup.beetask.entities.User;
+import net.beetechgroup.beetask.entities.organization.UserOrganizationStatus;
 import net.beetechgroup.beetask.entities.task.Task;
 import net.beetechgroup.beetask.entities.task.TaskHistoryItem;
 import net.beetechgroup.beetask.usecase.repository.CategoryRepository;
 import net.beetechgroup.beetask.usecase.repository.ProjectRepository;
 import net.beetechgroup.beetask.usecase.repository.TaskRepository;
+import net.beetechgroup.beetask.usecase.repository.UserOrganizationRepository;
 import net.beetechgroup.beetask.usecase.repository.UserRepository;
 import net.beetechgroup.beetask.usecase.task.create.CreateTaskMapper;
 import net.beetechgroup.beetask.usecase.task.create.CreateTaskOutput;
@@ -20,26 +23,23 @@ public class UpdateTaskUseCase {
     private final ProjectRepository projectRepository;
     private final CategoryRepository categoryRepository;
     private final UserRepository userRepository;
+    private final UserOrganizationRepository userOrganizationRepository;
 
     public UpdateTaskUseCase(TaskRepository taskRepository, ProjectRepository projectRepository,
-                              CategoryRepository categoryRepository, UserRepository userRepository) {
+                              CategoryRepository categoryRepository, UserRepository userRepository,
+                              UserOrganizationRepository userOrganizationRepository) {
         this.taskRepository = taskRepository;
         this.projectRepository = projectRepository;
         this.categoryRepository = categoryRepository;
         this.userRepository = userRepository;
+        this.userOrganizationRepository = userOrganizationRepository;
     }
 
     public CreateTaskOutput execute(UpdateTaskInput input) {
         LOGGER.infof("Updating task %d requested by user %s", input.id(), input.userEmail());
         Task task = taskRepository.findTaskById(input.id());
 
-        if (Objects.isNull(task.getUser())) {
+        validateRequesterMembership(input.organizationId(), input.userEmail());
-            task.setUser(userRepository.findByEmail(input.userEmail())
-                .orElseThrow(() -> {
-                    LOGGER.warnf("Task update failed because user %s was not found", input.userEmail());
-                    return new IllegalArgumentException("Usuário não encontrado: " + input.userEmail());
-                }));
-        }
 
         task.setTitle(input.title());
         task.setDescription(input.description());
@@ -67,6 +67,8 @@ public class UpdateTaskUseCase {
             task.setCategory(null);
         }
 
+        task.setUser(resolveAssignee(input.organizationId(), input.assigneeUserId()));
+
         if (Objects.nonNull(input.history())) {
             List<TaskHistoryItem> updatedHistory = input.history().stream().map(hInput -> {
                 if (Objects.nonNull(hInput.id())) {
@@ -101,4 +103,46 @@ public class UpdateTaskUseCase {
         LOGGER.infof("Task %d updated successfully", input.id());
         return output;
     }
+
+    private void validateRequesterMembership(Long organizationId, String userEmail) {
+        if (Objects.isNull(organizationId)) {
+            throw new IllegalArgumentException("Organização é obrigatória para atualizar a tarefa.");
+        }
+
+        User requester = userRepository.findByEmail(userEmail)
+                .orElseThrow(() -> {
+                    LOGGER.warnf("Task update failed because user %s was not found", userEmail);
+                    return new IllegalArgumentException("Usuário não encontrado: " + userEmail);
+                });
+
+        boolean belongsToOrganization = userRepository.findUserOrganizations(requester.getId()).stream()
+                .anyMatch(membership -> membership.getOrganization().getId().equals(organizationId));
+
+        if (!belongsToOrganization) {
+            LOGGER.warnf("Task update denied because user %s is not an active member of organization %d", userEmail, organizationId);
+            throw new SecurityException("Você não tem permissão para atualizar tarefas nesta organização.");
+        }
+    }
+
+    private User resolveAssignee(Long organizationId, Long assigneeUserId) {
+        if (Objects.isNull(assigneeUserId)) {
+            return null;
+        }
+
+        boolean belongsToOrganization = userOrganizationRepository
+                .findByOrganizationIdAndStatus(organizationId, UserOrganizationStatus.ACTIVE)
+                .stream()
+                .anyMatch(membership -> membership.getUser().getId().equals(assigneeUserId));
+
+        if (!belongsToOrganization) {
+            LOGGER.warnf("Task update failed because assignee %d is not an active member of organization %d", assigneeUserId, organizationId);
+            throw new IllegalArgumentException("Responsável não pertence à organização selecionada.");
+        }
+
+        return userRepository.findUserById(assigneeUserId)
+                .orElseThrow(() -> {
+                    LOGGER.warnf("Task update failed because assignee %d was not found", assigneeUserId);
+                    return new IllegalArgumentException("Usuário responsável não encontrado: " + assigneeUserId);
+                });
+    }
 }

frontend/src/pages/CreateTaskPage.tsx

@@ -7,6 +7,7 @@ import {
   Layout,
   PlusCircle,
   Send,
+  Users,
   XCircle,
 } from "lucide-react";
 import { format } from "date-fns";
@@ -22,12 +23,18 @@ import { useAuth } from "../contexts/AuthContext";
 import { useEffect } from "react";
 import { projectService, type Project } from "../services/projectService";
 import { categoryService } from "../services/categoryService";
+import {
+  organizationService,
+  type OrganizationMember,
+} from "../services/organizationService";
 import type { Category } from "../types/category";
 import { CategoryIcon } from "../components/CategoryIcon";
+import { UserAvatar } from "../components/UserAvatar";
 
-type FormState = Omit<CreateTaskPayload, 'projectId' | 'categoryId'> & {
+type FormState = Omit<CreateTaskPayload, 'organizationId' | 'projectId' | 'categoryId' | 'assigneeUserId'> & {
   projectId: string;
   categoryId: string;
+  assigneeUserId: string;
   history: TaskHistoryItem[];
 };
 
@@ -37,6 +44,7 @@ const initialFormState: FormState = {
   status: "NOT_STARTED",
   projectId: "",
   categoryId: "",
+  assigneeUserId: "",
   history: [],
 };
 
@@ -47,7 +55,9 @@ export function CreateTaskPage() {
   const [createdTask, setCreatedTask] = useState<TaskResponse | null>(null);
   const [projects, setProjects] = useState<Project[]>([]);
   const [categories, setCategories] = useState<Category[]>([]);
-  const { activeOrg } = useAuth();
+  const [members, setMembers] = useState<OrganizationMember[]>([]);
+  const [assignToLoggedUser, setAssignToLoggedUser] = useState(false);
+  const { activeOrg, user } = useAuth();
   const { id } = useParams();
   const navigate = useNavigate();
   const isEdit = !!id;
@@ -63,8 +73,10 @@ export function CreateTaskPage() {
             status: data.status,
             projectId: data.project?.id?.toString() || "",
             categoryId: data.category?.id?.toString() || "",
+            assigneeUserId: data.user?.id?.toString() || "",
             history: data.history || [],
           });
+          setAssignToLoggedUser(Boolean(user?.email && data.user?.email === user.email));
         } catch (error) {
           console.error("Erro ao carregar tarefa:", error);
           setErrorMessage("Não foi possível carregar os dados da tarefa.");
@@ -72,7 +84,7 @@ export function CreateTaskPage() {
       }
       loadTask();
     }
-  }, [id, isEdit]);
+  }, [id, isEdit, user?.email]);
 
   useEffect(() => {
     async function loadProjects() {
@@ -93,10 +105,30 @@ export function CreateTaskPage() {
         console.error("Erro ao carregar categorias:", error);
       }
     }
+    async function loadMembers() {
+      if (!activeOrg) return;
+      try {
+        const data = await organizationService.listMembers(activeOrg.id);
+        setMembers(data);
+      } catch (error) {
+        console.error("Erro ao carregar membros:", error);
+      }
+    }
     loadProjects();
     loadCategories();
+    loadMembers();
   }, [activeOrg]);
 
+  useEffect(() => {
+    if (!activeOrg) return;
+    if (assignToLoggedUser && user) {
+      const currentMember = members.find((member) => member.userEmail === user.email);
+      if (currentMember) {
+        setForm((current) => ({ ...current, assigneeUserId: currentMember.userId.toString() }));
+      }
+    }
+  }, [assignToLoggedUser, user, members, activeOrg]);
+
   function updateField(
     event: ChangeEvent<
       HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement
@@ -115,12 +147,18 @@ export function CreateTaskPage() {
     setIsSubmitting(true);
 
     try {
+      if (!activeOrg) {
+        throw new Error("Nenhuma organização ativa selecionada.");
+      }
+
       const payload = {
         title: form.title.trim(),
         description: form.description.trim(),
         status: form.status,
+        organizationId: activeOrg.id,
         projectId: form.projectId ? Number(form.projectId) : null,
         categoryId: form.categoryId ? Number(form.categoryId) : null,
+        assigneeUserId: form.assigneeUserId ? Number(form.assigneeUserId) : null,
         history: form.history,
       };
 
@@ -131,6 +169,7 @@ export function CreateTaskPage() {
         const response = await taskService.createTask(payload);
         setCreatedTask(response);
         setForm(initialFormState);
+        setAssignToLoggedUser(false);
       }
     } catch (error) {
       setErrorMessage(
@@ -198,6 +237,10 @@ export function CreateTaskPage() {
     );
   }
 
+  const selectedAssignee = members.find(
+    (member) => member.userId === Number(form.assigneeUserId),
+  );
+
   return (
     <div className="mx-auto max-w-3xl pb-20">
       <div className="mb-8 flex items-center justify-between">
@@ -324,6 +367,69 @@ export function CreateTaskPage() {
               </label>
             </div>
 
+            <div className="space-y-4 rounded-[2rem] border border-border-soft bg-app-bg/40 p-5">
+              <div className="flex flex-col gap-4 md:flex-row md:items-end md:justify-between">
+                <label className="group block flex-1">
+                  <div className="mb-2 flex items-center gap-2 text-sm font-bold text-text-main group-focus-within:text-brand">
+                    <Users size={16} />
+                    Funcionário Responsável
+                  </div>
+                  <select
+                    name="assigneeUserId"
+                    value={form.assigneeUserId}
+                    onChange={updateField}
+                    disabled={assignToLoggedUser}
+                    className="h-12 w-full appearance-none rounded-xl border border-border-soft bg-app-bg px-4 text-sm font-medium outline-none transition-all disabled:cursor-not-allowed disabled:opacity-60 focus:border-brand focus:ring-4 focus:ring-brand/10"
+                  >
+                    <option value="">Sem responsável</option>
+                    {members.map((member) => (
+                      <option key={member.userId} value={member.userId}>
+                        {member.userName} - {member.userEmail}
+                      </option>
+                    ))}
+                  </select>
+                </label>
+
+                <label className="flex items-center gap-3 rounded-xl border border-border-soft bg-surface px-4 py-3 text-sm font-bold text-text-main">
+                  <input
+                    type="checkbox"
+                    checked={assignToLoggedUser}
+                    onChange={(event) => {
+                      const checked = event.target.checked;
+                      setAssignToLoggedUser(checked);
+                      if (!checked && user?.email && selectedAssignee?.userEmail === user.email) {
+                        setForm((current) => ({ ...current, assigneeUserId: current.assigneeUserId }));
+                      }
+                    }}
+                    className="h-4 w-4 rounded border-border-soft text-brand focus:ring-brand"
+                  />
+                  Associar ao usuário logado
+                </label>
+              </div>
+
+              {selectedAssignee ? (
+                <div className="flex items-center gap-3 rounded-2xl border border-border-soft bg-surface p-4">
+                  <UserAvatar
+                    name={selectedAssignee.userName}
+                    photo={selectedAssignee.userPhoto}
+                    size="md"
+                  />
+                  <div>
+                    <p className="text-sm font-black text-text-main">
+                      {selectedAssignee.userName}
+                    </p>
+                    <p className="text-xs font-medium text-text-muted">
+                      {selectedAssignee.userEmail}
+                    </p>
+                  </div>
+                </div>
+              ) : (
+                <p className="text-xs font-medium text-text-muted">
+                  Esta tarefa pode ficar sem responsável.
+                </p>
+              )}
+            </div>
+
             {/* Description Section */}
             <label className="group block">
               <div className="mb-2 flex items-center gap-2 text-sm font-bold text-text-main group-focus-within:text-brand">

frontend/src/services/organizationService.ts

@@ -18,6 +18,13 @@ export interface UserJoinRequest {
   status: 'PENDING' | 'ACTIVE' | 'REJECTED'
 }
 
+export interface OrganizationMember {
+  userId: number
+  userName: string
+  userEmail: string
+  userPhoto?: string | null
+}
+
 export const organizationService = {
   create: async (name: string): Promise<Organization> => {
     return apiFetch('/organizations', {
@@ -46,6 +53,10 @@ export const organizationService = {
     return apiFetch(`/organizations/${organizationId}/requests/${userId}/reject`, { method: 'PATCH' })
   },
 
+  listMembers: async (organizationId: number): Promise<OrganizationMember[]> => {
+    return apiFetch<OrganizationMember[]>(`/organizations/${organizationId}/members`)
+  },
+
   getUserRequests: async (): Promise<UserJoinRequest[]> => {
     return apiFetch<UserJoinRequest[]>('/organizations/my-requests')
   }

frontend/src/services/taskService.ts

@@ -26,8 +26,10 @@ export const taskService = {
   async createTask(task: {
     title: string
     description?: string
+    organizationId: number
     projectId?: number | null
     categoryId?: number | null
+    assigneeUserId?: number | null
     status?: TaskStatus
   }): Promise<TaskResponse> {
     return apiFetch<TaskResponse>('/tasks', {
@@ -59,7 +61,12 @@ export const taskService = {
     return apiFetch<TaskResponse>(`/tasks/${id}`)
   },
 
-  async updateTask(id: number, task: Partial<TaskResponse> & { projectId?: number | null; categoryId?: number | null }): Promise<TaskResponse> {
+  async updateTask(id: number, task: Partial<TaskResponse> & {
+    organizationId: number
+    projectId?: number | null
+    categoryId?: number | null
+    assigneeUserId?: number | null
+  }): Promise<TaskResponse> {
     return apiFetch<TaskResponse>(`/tasks/${id}`, {
       method: 'PUT',
       body: task,

frontend/src/types/task.ts

@@ -18,8 +18,10 @@ export type CreateTaskPayload = {
   title: string
   description: string
   status: TaskStatus
+  organizationId: number
   projectId: number | null
   categoryId: number | null
+  assigneeUserId: number | null
 }
 
 export type TaskHistoryItem = {