diff --git a/cvat-ui/src/components/task-page/job-list.tsx b/cvat-ui/src/components/task-page/job-list.tsx
index 9418418ed771..8c8d0ecb76fc 100644
--- a/cvat-ui/src/components/task-page/job-list.tsx
+++ b/cvat-ui/src/components/task-page/job-list.tsx
@@ -6,7 +6,7 @@ import React from 'react';
 import { RouteComponentProps } from 'react-router';
 import { withRouter } from 'react-router-dom';
 import { Row, Col } from 'antd/lib/grid';
-import { QuestionCircleOutlined, CopyOutlined } from '@ant-design/icons';
+import { CopyOutlined } from '@ant-design/icons';
 import { ColumnFilterItem } from 'antd/lib/table/interface';
 import Table from 'antd/lib/table';
 import Button from 'antd/lib/button';
@@ -81,18 +81,24 @@ function JobListComponent(props: Props & RouteComponentProps): JSX.Element {
             title: 'Job',
             dataIndex: 'job',
             key: 'job',
-            render: (id: number): JSX.Element => (
+            render: (jobInstance: any): JSX.Element => (
                 <div>
-                    <Button
-                        type='link'
-                        onClick={(e: React.MouseEvent): void => {
-                            e.preventDefault();
-                            push(`/tasks/${taskId}/jobs/${id}`);
-                        }}
-                        href={`/tasks/${taskId}/jobs/${id}`}
+                    <CVATTooltip
+                        trigger='hover'
+                        title={jobInstance.assignee ? '' : 'You need to assign yourself to the job before open it.'}
                     >
-                        {`Job #${id}`}
-                    </Button>
+                        <Button
+                            type='link'
+                            disabled={!jobInstance.assignee}
+                            onClick={(e: React.MouseEvent): void => {
+                                e.preventDefault();
+                                push(`/tasks/${taskId}/jobs/${jobInstance.id}`);
+                            }}
+                            href={`/tasks/${taskId}/jobs/${jobInstance.id}`}
+                        >
+                            {`Job #${jobInstance.id}`}
+                        </Button>
+                    </CVATTooltip>
                 </div>
             ),
         },
@@ -107,8 +113,7 @@ function JobListComponent(props: Props & RouteComponentProps): JSX.Element {
             dataIndex: 'status',
             key: 'status',
             className: 'cvat-job-item-status',
-            render: (jobInstance: any): JSX.Element => {
-                const { status } = jobInstance;
+            render: (status: string): JSX.Element => {
                 let progressColor = null;
                 if (status === 'completed') {
                     progressColor = 'cvat-job-completed-color';
@@ -122,12 +127,12 @@ function JobListComponent(props: Props & RouteComponentProps): JSX.Element {
                     </Text>
                 );
             },
-            sorter: sorter('status.status'),
+            sorter: sorter('status'),
             filters: [
                 { text: 'annotation', value: 'annotation' },
                 { text: 'completed', value: 'completed' },
             ],
-            onFilter: (value: string | number | boolean, record: any) => record.status.status === value,
+            onFilter: (value: string | number | boolean, record: any) => record.status === value,
         },
         {
             title: 'Started on',
@@ -143,8 +148,8 @@ function JobListComponent(props: Props & RouteComponentProps): JSX.Element {
         },
         {
             title: 'Assignee',
-            dataIndex: 'assignee',
-            key: 'assignee',
+            dataIndex: 'job',
+            key: 'job',
             className: 'cvat-job-item-assignee',
             render: (jobInstance: any): JSX.Element => (
                 <UserSelector
@@ -157,10 +162,10 @@ function JobListComponent(props: Props & RouteComponentProps): JSX.Element {
                     }}
                 />
             ),
-            sorter: sorter('assignee.assignee.username'),
+            sorter: sorter('job.assignee.username'),
             filters: collectUsers('assignee'),
             onFilter: (value: string | number | boolean, record: any) =>
-                (record.assignee.assignee?.username || false) === value,
+                (record.job.assignee?.username || false) === value,
         },
     ];
 
@@ -175,12 +180,11 @@ function JobListComponent(props: Props & RouteComponentProps): JSX.Element {
         const now = moment(moment.now());
         acc.push({
             key: job.id,
-            job: job.id,
+            job,
             frames: `${job.startFrame}-${job.stopFrame}`,
-            status: job,
+            status: job.status,
             started: `${created.format('MMMM Do YYYY HH:MM')}`,
             duration: `${moment.duration(now.diff(created)).humanize()}`,
-            assignee: job,
         });
 
         return acc;
diff --git a/cvat/apps/engine/serializers.py b/cvat/apps/engine/serializers.py
index 317caba4f01c..e74f45e1b188 100644
--- a/cvat/apps/engine/serializers.py
+++ b/cvat/apps/engine/serializers.py
@@ -151,6 +151,45 @@ class Meta:
             'status', 'start_frame', 'stop_frame', 'task_id')
         read_only_fields = ('assignee', )
 
+    def update(self, instance, validated_data):
+        from rest_framework.utils import model_meta
+
+        serializers.raise_errors_on_nested_writes('update', self, validated_data)
+        info = model_meta.get_field_info(instance)
+
+        validated_assignee_id = validated_data.get('assignee_id', None)
+        validated_job_status = validated_data.get('status', None)
+
+        if validated_job_status is not None:
+            if validated_job_status == 'completed' and instance.assignee_id is None:
+                raise serializers.ValidationError('Job must have an assignee to be finished.')
+        elif validated_assignee_id != instance.assignee_id:
+            assignee = models.User.objects.get(id=validated_data.get('assignee_id', None))
+            if assignee.is_staff or assignee.is_superuser:
+                raise serializers.ValidationError('Admins could not be assigned to the job.')
+
+        # Simply set each attribute on the instance, and then save it.
+        # Note that unlike `.create()` we don't need to treat many-to-many
+        # relationships as being a special case. During updates we already
+        # have an instance pk for the relationships to be associated with.
+        m2m_fields = []
+        for attr, value in validated_data.items():
+            if attr in info.relations and info.relations[attr].to_many:
+                m2m_fields.append((attr, value))
+            else:
+                setattr(instance, attr, value)
+
+        instance.save()
+
+        # Note that many-to-many fields are set after updating instance.
+        # Setting m2m fields triggers signals which could potentially change
+        # updated instance and we do not want it to collide with .update()
+        for attr, value in m2m_fields:
+            field = getattr(instance, attr)
+            field.set(value)
+
+        return instance
+
 class SimpleJobSerializer(serializers.ModelSerializer):
     assignee = BasicUserSerializer(allow_null=True)
     assignee_id = serializers.IntegerField(write_only=True, allow_null=True)