diff --git a/package.json b/package.json
index 1671aba..23ea575 100644
--- a/package.json
+++ b/package.json
@@ -23,20 +23,20 @@
   },
   "devDependencies": {
     "@flaschengeist/types": "^1.0.0-alpha.5",
-    "@quasar/app": "^3.2.2",
-    "quasar": "^2.3.2",
+    "@quasar/app": "^3.2.3",
+    "quasar": "^2.3.3",
     "axios": "^0.24.0",
     "prettier": "^2.4.1",
     "typescript": "^4.4.4",
-    "pinia": "^2.0.3",
+    "pinia": "^2.0.4",
     "@typescript-eslint/eslint-plugin": "^5.4.0",
     "@typescript-eslint/parser": "^5.4.0",
-    "eslint": "^8.2.0",
+    "eslint": "^8.3.0",
     "eslint-config-prettier": "^8.3.0",
-    "eslint-plugin-vue": "^8.0.3"
+    "eslint-plugin-vue": "^8.1.1"
   },
   "peerDependencies": {
-    "@flaschengeist/api": "^1.0.0-alpha.2",
+    "@flaschengeist/api": "^1.0.0-alpha.4",
     "@flaschengeist/users": "^1.0.0-alpha.1"
   },
   "prettier": {
diff --git a/src/api.d.ts b/src/api.d.ts
index 4584a27..bf406f8 100644
--- a/src/api.d.ts
+++ b/src/api.d.ts
@@ -27,6 +27,7 @@ declare namespace FG {
     comment?: string;
     services: Array<Service>;
     required_services: number;
+    locked: boolean;
   }
   interface JobType {
     id: number;
diff --git a/src/components/overview/slots/JobSlot.vue b/src/components/overview/slots/JobSlot.vue
index 5c4a8f0..190f6a8 100644
--- a/src/components/overview/slots/JobSlot.vue
+++ b/src/components/overview/slots/JobSlot.vue
@@ -27,8 +27,29 @@
       >
       </q-select>
       <div class="row col-12 justify-end">
-        <q-btn v-if="canEnroll" flat color="primary" label="Eintragen" @click="enrollForJob" />
-        <q-btn v-if="isEnrolled" flat color="negative" label="Austragen" @click="signOutFromJob" />
+        <q-btn
+          v-if="!modelValue.locked && !isEnrolled && !isFull"
+          flat
+          color="primary"
+          label="Eintragen"
+          @click="enrollForJob"
+        />
+        <q-btn v-if="isEnrolled && !modelValue.locked" flat color="secondary" label="Optionen">
+          <q-menu auto-close>
+            <q-list style="min-width: 100px">
+              <q-item v-if="!isFull && canInvite" clickable @click="invite">
+                <q-item-section>Einladen</q-item-section>
+              </q-item>
+              <q-item clickable @click="transfer">
+                <q-item-section>Tauschen</q-item-section>
+              </q-item>
+              <q-separator />
+              <q-item clickable @click="signOutFromJob">
+                <q-item-section class="text-negative">Austragen</q-item-section>
+              </q-item>
+            </q-list>
+          </q-menu>
+        </q-btn>
       </div>
     </div>
   </q-card>
@@ -36,9 +57,10 @@
 
 <script lang="ts">
 import { defineComponent, onBeforeMount, computed, PropType } from 'vue';
-import { useQuasar } from 'quasar';
+import { date, useQuasar } from 'quasar';
 import { asHour, useMainStore, useUserStore } from '@flaschengeist/api';
 import { useEventStore } from '../../../store';
+import TransferInviteDialog from './TransferInviteDialog.vue';
 
 export default defineComponent({
   name: 'JobSlot',
@@ -72,12 +94,20 @@ export default defineComponent({
         ) !== -1
     );
 
-    const canEnroll = computed(() => {
-      const is = isEnrolled.value;
-      let sum = 0;
-      props.modelValue.services.forEach((s) => (sum += s.value));
-      return sum < props.modelValue.required_services && !is;
-    });
+    const isFull = computed(
+      () =>
+        props.modelValue.services.map((s) => s.value).reduce((p, c) => p + c, 0) >=
+        props.modelValue.required_services
+    );
+
+    const canInvite = computed(
+      () =>
+        (props.modelValue.end || props.modelValue.start) >
+        date.subtractFromDate(
+          date.buildDate({ hours: 0, minutes: 0, seconds: 0, milliseconds: 0 }),
+          { days: 1 }
+        )
+    );
 
     async function enrollForJob() {
       const newService: FG.Service = {
@@ -86,7 +116,9 @@ export default defineComponent({
         value: 1,
       };
       try {
-        const job = await store.updateJob(props.eventId, props.modelValue.id, { user: newService });
+        await store.assignToJob(props.modelValue.id, newService);
+        const job = Object.assign({}, props.modelValue)
+        job.services.push(newService)
         emit('update:modelValue', job);
       } catch (error) {
         console.warn(error);
@@ -107,9 +139,9 @@ export default defineComponent({
         value: -1,
       };
       try {
-        const job = await store.updateJob(props.eventId, props.modelValue.id, {
-          user: newService,
-        });
+        await store.assignToJob(props.modelValue.id, newService);
+        const job = Object.assign({}, props.modelValue)
+        job.services.push(newService)
         emit('update:modelValue', job);
       } catch (error) {
         console.warn(error);
@@ -124,12 +156,24 @@ export default defineComponent({
       }
     }
 
+    function invite(isInvite = true) {
+      quasar.dialog({
+        component: TransferInviteDialog,
+        componentProps: {
+          invite: isInvite,
+          job: props.modelValue,
+        },
+      });
+    }
+
     return {
-      availableUsers,
+      canInvite,
       enrollForJob,
       isEnrolled,
+      isFull,
+      invite: () => invite(true),
       signOutFromJob,
-      canEnroll,
+      transfer: () => invite(false),
       userDisplay,
       asHour,
     };
diff --git a/src/components/overview/slots/TransferInviteDialog.vue b/src/components/overview/slots/TransferInviteDialog.vue
new file mode 100644
index 0000000..d0f6b1b
--- /dev/null
+++ b/src/components/overview/slots/TransferInviteDialog.vue
@@ -0,0 +1,84 @@
+<template>
+  <!-- notice dialogRef here -->
+  <q-dialog ref="dialogRef" @hide="onDialogHide">
+    <q-card class="q-dialog-plugin">
+      <q-card-section>
+        <div v-if="isInvite" class="text-h6">Zum Dienst einladen</div>
+        <div v-else class="text-h6">Dienst tauschen</div>
+      </q-card-section>
+      <q-separator />
+      <q-card-section>
+        <q-select
+          v-model="invitees"
+          filled
+          :options="otherUsers"
+          :option-label="(opt) => opt.display_name"
+          :multiple="isInvite"
+          use-chips
+          stack-label
+          label="Dienste"
+        >
+        </q-select>
+      </q-card-section>
+      <!-- buttons example -->
+      <q-card-actions align="right">
+        <q-btn color="primary" label="Ok" @click="invite" />
+        <q-btn color="primary" label="Abbrechen" @click="onDialogCancel" />
+      </q-card-actions>
+    </q-card>
+  </q-dialog>
+</template>
+
+<script lang="ts">
+import { useMainStore, useUserStore } from '@flaschengeist/api';
+import { useEventStore } from '../../../store';
+import { useDialogPluginComponent } from 'quasar';
+import { PropType, computed, defineComponent, ref } from 'vue';
+
+export default defineComponent({
+  props: {
+    isInvite: {
+      type: Boolean,
+      default: true,
+    },
+    job: {
+      required: true,
+      type: Object as PropType<FG.Job>,
+    },
+  },
+
+  emits: [...useDialogPluginComponent.emits],
+
+  setup(props) {
+    const { dialogRef, onDialogHide, onDialogOK, onDialogCancel } = useDialogPluginComponent();
+
+    const userStore = useUserStore();
+    const mainStore = useMainStore();
+    const store = useEventStore();
+    const invitees = ref([] as FG.User[]);
+    const otherUsers = computed(() =>
+      userStore.users.filter(
+        (u) =>
+          u.userid !== mainStore.currentUser.userid &&
+          props.job.services.findIndex((s) => s.userid === u.userid) === -1
+      )
+    );
+
+    function invite() {
+      store
+        .sendInvite(props.job, invitees.value, !props.isInvite)
+        .then(() => onDialogOK())
+        .catch(() => onDialogCancel());
+    }
+
+    return {
+      invite,
+      invitees,
+      otherUsers,
+      dialogRef,
+      onDialogHide,
+      onDialogCancel,
+    };
+  },
+});
+</script>
\ No newline at end of file
diff --git a/src/permissions.ts b/src/permissions.ts
index c1bc584..00f29cf 100644
--- a/src/permissions.ts
+++ b/src/permissions.ts
@@ -13,4 +13,8 @@ export const PERMISSIONS = {
   ASSIGN: 'events_assign',
   // Can assign other users to jobs
   ASSIGN_OTHER: 'events_assign_other',
+  // Can see users assigned as backup
+  SEE_BACKUP: 'events_see_backup',
+  // Can lock jobs, no further services can be assigned or unassigned
+  LOCK_JOBS: 'events_lock_jobs',
 };
diff --git a/src/store.ts b/src/store.ts
index 328a991..623e8f2 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -138,14 +138,8 @@ export const useEventStore = defineStore({
       }
     },
 
-    async updateJob(eventId: number, jobId: number, service: FG.Service | UserService) {
-      try {
-        const { data } = await api.put<FG.Job>(`/events/${eventId}/jobs/${jobId}`, service);
-        fixJob(data);
-        return data;
-      } catch (error) {
-        throw error;
-      }
+    async assignToJob(jobId: number, service: FG.Service) {
+      return api.post<FG.Job>(`/events/jobs/${jobId}/assign`, service);  
     },
 
     async addEvent(event: FG.Event) {
@@ -161,5 +155,11 @@ export const useEventStore = defineStore({
         return data;
       }
     },
+
+    async sendInvite(job: FG.Job, invitees: FG.User[], transfer = false) {
+      await Promise.resolve()
+      console.log(job, invitees, transfer)
+      return Promise.resolve()
+    }
   },
 });