diff --git a/src/admin/src/api/segments.ts b/src/admin/src/api/segments.ts
new file mode 100644
index 0000000..16ac5d1
--- /dev/null
+++ b/src/admin/src/api/segments.ts
@@ -0,0 +1,45 @@
+import apiClient from './client';
+import type {
+  SegmentResponse,
+  CreateSegmentRequest,
+  UpdateSegmentRequest,
+} from '@/types/api';
+
+export async function listSegments(projectId: number): Promise<SegmentResponse[]> {
+  const { data } = await apiClient.get<SegmentResponse[]>(`/v1/projects/${projectId}/segments`);
+  return data;
+}
+
+export async function getSegment(projectId: number, id: number): Promise<SegmentResponse> {
+  const { data } = await apiClient.get<SegmentResponse>(
+    `/v1/projects/${projectId}/segments/${id}`,
+  );
+  return data;
+}
+
+export async function createSegment(
+  projectId: number,
+  request: CreateSegmentRequest,
+): Promise<SegmentResponse> {
+  const { data } = await apiClient.post<SegmentResponse>(
+    `/v1/projects/${projectId}/segments`,
+    request,
+  );
+  return data;
+}
+
+export async function updateSegment(
+  projectId: number,
+  id: number,
+  request: UpdateSegmentRequest,
+): Promise<SegmentResponse> {
+  const { data } = await apiClient.put<SegmentResponse>(
+    `/v1/projects/${projectId}/segments/${id}`,
+    request,
+  );
+  return data;
+}
+
+export async function deleteSegment(projectId: number, id: number): Promise<void> {
+  await apiClient.delete(`/v1/projects/${projectId}/segments/${id}`);
+}
diff --git a/src/admin/src/components/segments/ConditionEditor.vue b/src/admin/src/components/segments/ConditionEditor.vue
new file mode 100644
index 0000000..70dbf9f
--- /dev/null
+++ b/src/admin/src/components/segments/ConditionEditor.vue
@@ -0,0 +1,120 @@
+<template>
+  <div class="d-flex align-center ga-2 flex-wrap" data-testid="condition-editor">
+    <!-- Property -->
+    <v-text-field
+      :model-value="condition.property"
+      label="Property"
+      variant="outlined"
+      density="compact"
+      hide-details
+      style="min-width: 140px; flex: 1"
+      data-testid="condition-property"
+      @update:model-value="update('property', $event)"
+    />
+
+    <!-- Operator -->
+    <v-select
+      :model-value="condition.operator"
+      :items="operatorItems"
+      label="Operator"
+      variant="outlined"
+      density="compact"
+      hide-details
+      style="min-width: 160px; flex: 1"
+      data-testid="condition-operator"
+      @update:model-value="update('operator', $event)"
+    />
+
+    <!-- Value — hidden for no-value operators -->
+    <template v-if="needsValue">
+      <v-slider
+        v-if="condition.operator === 'PercentageSplit'"
+        :model-value="percentageValue"
+        :min="0"
+        :max="100"
+        :step="1"
+        color="primary"
+        hide-details
+        thumb-label
+        style="min-width: 160px; flex: 2"
+        data-testid="condition-percentage-slider"
+        @update:model-value="update('value', String($event))"
+      />
+      <v-text-field
+        v-else
+        :model-value="condition.value"
+        label="Value"
+        variant="outlined"
+        density="compact"
+        hide-details
+        style="min-width: 140px; flex: 1"
+        data-testid="condition-value"
+        @update:model-value="update('value', $event)"
+      />
+    </template>
+
+    <!-- Remove button -->
+    <v-btn
+      icon="mdi-close"
+      size="x-small"
+      variant="text"
+      color="error"
+      data-testid="remove-condition-btn"
+      @click="$emit('remove')"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+import type { SegmentCondition, SegmentConditionOperator } from '@/types/api';
+
+interface Props {
+  condition: SegmentCondition;
+}
+
+const props = defineProps<Props>();
+
+const emit = defineEmits<{
+  'update:condition': [condition: SegmentCondition];
+  remove: [];
+}>();
+
+const operatorItems: { title: string; value: SegmentConditionOperator }[] = [
+  { title: 'Equal', value: 'Equal' },
+  { title: 'Not Equal', value: 'NotEqual' },
+  { title: 'Contains', value: 'Contains' },
+  { title: 'Not Contains', value: 'NotContains' },
+  { title: 'Regex', value: 'Regex' },
+  { title: 'Greater Than', value: 'GreaterThan' },
+  { title: 'Greater Than or Equal', value: 'GreaterThanOrEqual' },
+  { title: 'Less Than', value: 'LessThan' },
+  { title: 'Less Than or Equal', value: 'LessThanOrEqual' },
+  { title: 'Is True', value: 'IsTrue' },
+  { title: 'Is False', value: 'IsFalse' },
+  { title: 'In', value: 'In' },
+  { title: 'Not In', value: 'NotIn' },
+  { title: 'Is Set', value: 'IsSet' },
+  { title: 'Is Not Set', value: 'IsNotSet' },
+  { title: 'Percentage Split', value: 'PercentageSplit' },
+  { title: 'Modulo', value: 'ModuloValueDivisorRemainder' },
+];
+
+const noValueOperators: SegmentConditionOperator[] = [
+  'IsTrue',
+  'IsFalse',
+  'IsSet',
+  'IsNotSet',
+];
+
+const needsValue = computed(() => !noValueOperators.includes(props.condition.operator));
+
+const percentageValue = computed(() => {
+  const n = Number(props.condition.value);
+  return isNaN(n) ? 0 : n;
+});
+
+function update(field: keyof SegmentCondition, value: string): void {
+  emit('update:condition', { ...props.condition, [field]: value });
+}
+</script>
diff --git a/src/admin/src/components/segments/RuleGroupEditor.vue b/src/admin/src/components/segments/RuleGroupEditor.vue
new file mode 100644
index 0000000..4a19f36
--- /dev/null
+++ b/src/admin/src/components/segments/RuleGroupEditor.vue
@@ -0,0 +1,131 @@
+<template>
+  <v-card variant="outlined" rounded="lg" class="pa-3" data-testid="rule-group-editor">
+    <!-- AND / OR toggle -->
+    <div class="d-flex align-center ga-2 mb-3">
+      <span class="text-body-2 font-weight-medium text-medium-emphasis">Match</span>
+      <v-btn-toggle
+        :model-value="rule.type"
+        density="compact"
+        mandatory
+        color="primary"
+        variant="outlined"
+        data-testid="rule-type-toggle"
+        @update:model-value="onTypeChange"
+      >
+        <v-btn value="AND" size="small" data-testid="rule-type-and">ALL (AND)</v-btn>
+        <v-btn value="OR" size="small" data-testid="rule-type-or">ANY (OR)</v-btn>
+      </v-btn-toggle>
+      <v-spacer />
+      <v-btn
+        v-if="removable"
+        icon="mdi-trash-can-outline"
+        size="x-small"
+        variant="text"
+        color="error"
+        data-testid="remove-rule-group-btn"
+        @click="$emit('remove')"
+      />
+    </div>
+
+    <!-- Conditions -->
+    <div class="d-flex flex-column ga-2 mb-3">
+      <ConditionEditor
+        v-for="(condition, ci) in rule.conditions"
+        :key="ci"
+        :condition="condition"
+        @update:condition="onUpdateCondition(ci, $event)"
+        @remove="onRemoveCondition(ci)"
+      />
+    </div>
+
+    <!-- Child rule groups -->
+    <div v-if="rule.childRules && rule.childRules.length > 0" class="d-flex flex-column ga-2 mb-3">
+      <RuleGroupEditor
+        v-for="(child, ri) in rule.childRules"
+        :key="ri"
+        :rule="child"
+        :removable="true"
+        @update:rule="onUpdateChildRule(ri, $event)"
+        @remove="onRemoveChildRule(ri)"
+      />
+    </div>
+
+    <!-- Add buttons -->
+    <div class="d-flex ga-2">
+      <v-btn
+        size="x-small"
+        variant="tonal"
+        color="primary"
+        prepend-icon="mdi-plus"
+        data-testid="add-condition-btn"
+        @click="onAddCondition"
+      >
+        Add condition
+      </v-btn>
+      <v-btn
+        size="x-small"
+        variant="tonal"
+        color="secondary"
+        prepend-icon="mdi-plus"
+        data-testid="add-group-btn"
+        @click="onAddChildGroup"
+      >
+        Add group
+      </v-btn>
+    </div>
+  </v-card>
+</template>
+
+<script setup lang="ts">
+import type { SegmentRule, SegmentCondition, SegmentRuleType } from '@/types/api';
+import ConditionEditor from './ConditionEditor.vue';
+
+interface Props {
+  rule: SegmentRule;
+  removable?: boolean;
+}
+
+const props = defineProps<Props>();
+
+const emit = defineEmits<{
+  'update:rule': [rule: SegmentRule];
+  remove: [];
+}>();
+
+function onTypeChange(type: string): void {
+  emit('update:rule', { ...props.rule, type: type as SegmentRuleType });
+}
+
+function onUpdateCondition(index: number, condition: SegmentCondition): void {
+  const conditions = [...props.rule.conditions];
+  conditions[index] = condition;
+  emit('update:rule', { ...props.rule, conditions });
+}
+
+function onRemoveCondition(index: number): void {
+  const conditions = props.rule.conditions.filter((_, i) => i !== index);
+  emit('update:rule', { ...props.rule, conditions });
+}
+
+function onAddCondition(): void {
+  const newCondition: SegmentCondition = { property: '', operator: 'Equal', value: '' };
+  emit('update:rule', { ...props.rule, conditions: [...props.rule.conditions, newCondition] });
+}
+
+function onAddChildGroup(): void {
+  const newGroup: SegmentRule = { type: 'AND', conditions: [] };
+  const childRules = [...(props.rule.childRules ?? []), newGroup];
+  emit('update:rule', { ...props.rule, childRules });
+}
+
+function onUpdateChildRule(index: number, child: SegmentRule): void {
+  const childRules = [...(props.rule.childRules ?? [])];
+  childRules[index] = child;
+  emit('update:rule', { ...props.rule, childRules });
+}
+
+function onRemoveChildRule(index: number): void {
+  const childRules = (props.rule.childRules ?? []).filter((_, i) => i !== index);
+  emit('update:rule', { ...props.rule, childRules });
+}
+</script>
diff --git a/src/admin/src/components/segments/SegmentEditor.vue b/src/admin/src/components/segments/SegmentEditor.vue
new file mode 100644
index 0000000..55c5c70
--- /dev/null
+++ b/src/admin/src/components/segments/SegmentEditor.vue
@@ -0,0 +1,179 @@
+<template>
+  <v-dialog
+    :model-value="modelValue"
+    max-width="680"
+    scrollable
+    @update:model-value="$emit('update:modelValue', $event)"
+  >
+    <v-card rounded="lg" data-testid="segment-editor">
+      <v-card-title class="d-flex align-center justify-space-between pa-6 pb-3">
+        <span class="text-h6">{{ segment ? 'Edit Segment' : 'Create Segment' }}</span>
+        <v-btn icon="mdi-close" variant="text" size="small" @click="$emit('update:modelValue', false)" />
+      </v-card-title>
+      <v-divider />
+
+      <v-card-text class="pa-6">
+        <v-alert
+          v-if="errorMessage"
+          type="error"
+          variant="tonal"
+          density="compact"
+          closable
+          class="mb-4"
+          @click:close="errorMessage = null"
+        >
+          {{ errorMessage }}
+        </v-alert>
+
+        <!-- Name -->
+        <v-form ref="formRef" data-testid="segment-form">
+          <v-text-field
+            v-model="form.name"
+            label="Segment name"
+            variant="outlined"
+            density="comfortable"
+            class="mb-4"
+            :rules="[rules.required]"
+            :counter="150"
+            data-testid="segment-name-input"
+          />
+        </v-form>
+
+        <!-- Rules -->
+        <p class="text-body-2 font-weight-medium mb-2">Rules</p>
+
+        <div v-if="form.rules.length === 0" class="text-center py-4 text-medium-emphasis text-body-2" data-testid="no-rules-message">
+          No rules yet. Add a rule group to start targeting users.
+        </div>
+
+        <div class="d-flex flex-column ga-3 mb-3">
+          <RuleGroupEditor
+            v-for="(rule, ri) in form.rules"
+            :key="ri"
+            :rule="rule"
+            :removable="true"
+            @update:rule="onUpdateRule(ri, $event)"
+            @remove="onRemoveRule(ri)"
+          />
+        </div>
+
+        <v-btn
+          size="small"
+          variant="tonal"
+          color="primary"
+          prepend-icon="mdi-plus"
+          data-testid="add-rule-group-btn"
+          @click="onAddRuleGroup"
+        >
+          Add rule group
+        </v-btn>
+      </v-card-text>
+
+      <v-divider />
+      <v-card-actions class="pa-4">
+        <v-spacer />
+        <v-btn variant="text" @click="$emit('update:modelValue', false)">Cancel</v-btn>
+        <v-btn
+          color="primary"
+          variant="flat"
+          :loading="isSaving"
+          data-testid="save-segment-btn"
+          @click="onSave"
+        >
+          {{ segment ? 'Save' : 'Create' }}
+        </v-btn>
+      </v-card-actions>
+    </v-card>
+  </v-dialog>
+</template>
+
+<script setup lang="ts">
+import { ref, watch } from 'vue';
+import { createSegment, updateSegment } from '@/api/segments';
+import { useContextStore } from '@/stores/context';
+import RuleGroupEditor from './RuleGroupEditor.vue';
+import type { SegmentResponse, SegmentRule } from '@/types/api';
+
+interface Props {
+  modelValue: boolean;
+  segment?: SegmentResponse | null;
+}
+
+const props = defineProps<Props>();
+
+const emit = defineEmits<{
+  'update:modelValue': [value: boolean];
+  saved: [segment: SegmentResponse];
+}>();
+
+const contextStore = useContextStore();
+
+const formRef = ref<{ validate: () => Promise<{ valid: boolean }> } | null>(null);
+const isSaving = ref(false);
+const errorMessage = ref<string | null>(null);
+
+const form = ref<{ name: string; rules: SegmentRule[] }>({
+  name: '',
+  rules: [],
+});
+
+const rules = {
+  required: (v: string) => !!v || 'Required',
+};
+
+function resetForm(): void {
+  if (props.segment) {
+    form.value = {
+      name: props.segment.name,
+      rules: JSON.parse(JSON.stringify(props.segment.rules)),
+    };
+  } else {
+    form.value = { name: '', rules: [] };
+  }
+  errorMessage.value = null;
+}
+
+watch(() => props.modelValue, (open) => {
+  if (open) resetForm();
+});
+
+watch(() => props.segment, resetForm, { immediate: true });
+
+function onAddRuleGroup(): void {
+  form.value.rules = [...form.value.rules, { type: 'AND', conditions: [] }];
+}
+
+function onUpdateRule(index: number, rule: SegmentRule): void {
+  const updated = [...form.value.rules];
+  updated[index] = rule;
+  form.value.rules = updated;
+}
+
+function onRemoveRule(index: number): void {
+  form.value.rules = form.value.rules.filter((_, i) => i !== index);
+}
+
+async function onSave(): Promise<void> {
+  if (!formRef.value) return;
+  const { valid } = await formRef.value.validate();
+  if (!valid) return;
+
+  const projectId = contextStore.currentProject?.id;
+  if (!projectId) return;
+
+  isSaving.value = true;
+  errorMessage.value = null;
+  try {
+    const payload = { name: form.value.name, rules: form.value.rules };
+    const saved = props.segment
+      ? await updateSegment(projectId, props.segment.id, payload)
+      : await createSegment(projectId, payload);
+    emit('saved', saved);
+    emit('update:modelValue', false);
+  } catch {
+    errorMessage.value = 'Failed to save segment. Please try again.';
+  } finally {
+    isSaving.value = false;
+  }
+}
+</script>
diff --git a/src/admin/src/views/SegmentsView.vue b/src/admin/src/views/SegmentsView.vue
index 25ace16..07f8edb 100644
--- a/src/admin/src/views/SegmentsView.vue
+++ b/src/admin/src/views/SegmentsView.vue
@@ -1,18 +1,247 @@
 <template>
-  <v-row>
-    <v-col cols="12">
-      <div class="d-flex align-center justify-space-between mb-4">
-        <h1 class="text-h5 font-weight-bold">Segments</h1>
-      </div>
-      <v-card>
-        <v-card-text class="text-medium-emphasis">
-          Segments let you target specific groups of users based on their traits.
-          Select a project to manage segments.
-        </v-card-text>
+  <div>
+    <div class="d-flex align-center justify-space-between mb-4">
+      <h1 class="text-h5 font-weight-bold">Segments</h1>
+      <v-btn
+        v-if="contextStore.currentProject"
+        color="primary"
+        prepend-icon="mdi-plus"
+        data-testid="create-segment-btn"
+        @click="openCreateDialog"
+      >
+        Create Segment
+      </v-btn>
+    </div>
+
+    <!-- No project selected -->
+    <v-card v-if="!contextStore.currentProject" variant="outlined" rounded="lg">
+      <v-card-text class="text-center py-10">
+        <v-icon size="48" color="medium-emphasis" class="mb-3">mdi-account-group-outline</v-icon>
+        <p class="text-h6 mb-2">Select a project</p>
+        <p class="text-body-2 text-medium-emphasis">
+          Choose a project from the sidebar to manage its segments.
+        </p>
+      </v-card-text>
+    </v-card>
+
+    <template v-else>
+      <v-card rounded="lg">
+        <v-data-table
+          :headers="headers"
+          :items="segments"
+          :loading="isLoading"
+          :items-per-page="20"
+          hover
+          data-testid="segments-table"
+        >
+          <!-- Name -->
+          <template #item.name="{ item }: { item: SegmentResponse }">
+            <span class="text-body-2 font-weight-medium">{{ item.name }}</span>
+          </template>
+
+          <!-- Rule count -->
+          <template #item.rules="{ item }: { item: SegmentResponse }">
+            <span class="text-body-2 text-medium-emphasis">{{ item.rules.length }}</span>
+          </template>
+
+          <!-- Created at -->
+          <template #item.createdAt="{ item }: { item: SegmentResponse }">
+            <span class="text-caption text-medium-emphasis">{{ formatDate(item.createdAt) }}</span>
+          </template>
+
+          <!-- Actions -->
+          <template #item.actions="{ item }: { item: SegmentResponse }">
+            <v-btn
+              icon="mdi-pencil-outline"
+              size="small"
+              variant="text"
+              :data-testid="`edit-segment-${item.id}`"
+              @click="openEditDialog(item)"
+            />
+            <v-btn
+              icon="mdi-trash-can-outline"
+              size="small"
+              variant="text"
+              color="error"
+              :data-testid="`delete-segment-${item.id}`"
+              @click="openDeleteConfirm(item)"
+            />
+          </template>
+
+          <!-- Empty state -->
+          <template #no-data>
+            <div class="text-center py-8">
+              <v-icon size="40" color="medium-emphasis" class="mb-2">mdi-account-group-outline</v-icon>
+              <p class="text-body-2 text-medium-emphasis">No segments yet. Create your first segment.</p>
+            </div>
+          </template>
+        </v-data-table>
       </v-card>
-    </v-col>
-  </v-row>
+    </template>
+
+    <!-- Create / Edit dialog -->
+    <SegmentEditor
+      v-model="showEditor"
+      :segment="editingSegment"
+      @saved="onSegmentSaved"
+    />
+
+    <!-- Delete confirmation dialog -->
+    <v-dialog v-model="showDeleteDialog" max-width="400">
+      <v-card rounded="lg" data-testid="delete-confirm-dialog">
+        <v-card-title class="text-body-1 font-weight-bold pa-4 pb-2">Delete Segment</v-card-title>
+        <v-card-text class="pa-4 pt-0">
+          <p class="text-body-2 mb-3">
+            Are you sure you want to delete
+            <strong>{{ deletingSegment?.name }}</strong>?
+            This cannot be undone.
+          </p>
+          <p class="text-body-2 mb-2">
+            Type <strong>{{ deletingSegment?.name }}</strong> to confirm:
+          </p>
+          <v-text-field
+            v-model="deleteConfirmName"
+            variant="outlined"
+            density="compact"
+            hide-details
+            :placeholder="deletingSegment?.name"
+            data-testid="delete-confirm-input"
+          />
+        </v-card-text>
+        <v-card-actions class="pa-4 pt-0">
+          <v-spacer />
+          <v-btn variant="text" @click="closeDeleteConfirm">Cancel</v-btn>
+          <v-btn
+            color="error"
+            variant="flat"
+            :disabled="deleteConfirmName !== deletingSegment?.name"
+            :loading="isDeleting"
+            data-testid="confirm-delete-btn"
+            @click="onDeleteSegment"
+          >
+            Delete
+          </v-btn>
+        </v-card-actions>
+      </v-card>
+    </v-dialog>
+
+    <!-- Error snackbar -->
+    <v-snackbar
+      v-model="showErrorSnackbar"
+      color="error"
+      :timeout="4000"
+      location="bottom"
+    >
+      {{ snackbarMessage }}
+      <template #actions>
+        <v-btn variant="text" @click="showErrorSnackbar = false">Dismiss</v-btn>
+      </template>
+    </v-snackbar>
+  </div>
 </template>
 
 <script setup lang="ts">
+import { ref, watch } from 'vue';
+import { listSegments, deleteSegment } from '@/api/segments';
+import { useContextStore } from '@/stores/context';
+import SegmentEditor from '@/components/segments/SegmentEditor.vue';
+import type { SegmentResponse } from '@/types/api';
+
+const contextStore = useContextStore();
+
+const segments = ref<SegmentResponse[]>([]);
+const isLoading = ref(false);
+const showErrorSnackbar = ref(false);
+const snackbarMessage = ref('');
+
+const showEditor = ref(false);
+const editingSegment = ref<SegmentResponse | null>(null);
+
+const showDeleteDialog = ref(false);
+const deletingSegment = ref<SegmentResponse | null>(null);
+const deleteConfirmName = ref('');
+const isDeleting = ref(false);
+
+const headers = [
+  { title: 'Name', key: 'name', sortable: true },
+  { title: 'Rules', key: 'rules', sortable: false, width: '80' },
+  { title: 'Created', key: 'createdAt', sortable: true, width: '130' },
+  { title: '', key: 'actions', sortable: false, width: '80', align: 'end' as const },
+];
+
+function showError(message: string): void {
+  snackbarMessage.value = message;
+  showErrorSnackbar.value = true;
+}
+
+async function loadSegments(): Promise<void> {
+  const projectId = contextStore.currentProject?.id;
+  if (!projectId) {
+    segments.value = [];
+    return;
+  }
+  isLoading.value = true;
+  try {
+    segments.value = await listSegments(projectId);
+  } catch {
+    segments.value = [];
+    showError('Failed to load segments. Please refresh the page.');
+  } finally {
+    isLoading.value = false;
+  }
+}
+
+watch(() => contextStore.currentProject, loadSegments, { immediate: true });
+
+function openCreateDialog(): void {
+  editingSegment.value = null;
+  showEditor.value = true;
+}
+
+function openEditDialog(segment: SegmentResponse): void {
+  editingSegment.value = segment;
+  showEditor.value = true;
+}
+
+function openDeleteConfirm(segment: SegmentResponse): void {
+  deletingSegment.value = segment;
+  deleteConfirmName.value = '';
+  showDeleteDialog.value = true;
+}
+
+function closeDeleteConfirm(): void {
+  showDeleteDialog.value = false;
+  deletingSegment.value = null;
+  deleteConfirmName.value = '';
+}
+
+function onSegmentSaved(saved: SegmentResponse): void {
+  const idx = segments.value.findIndex((s) => s.id === saved.id);
+  if (idx >= 0) {
+    segments.value[idx] = saved;
+  } else {
+    segments.value.unshift(saved);
+  }
+}
+
+async function onDeleteSegment(): Promise<void> {
+  if (!deletingSegment.value || deleteConfirmName.value !== deletingSegment.value.name) return;
+  const projectId = contextStore.currentProject?.id;
+  if (!projectId) return;
+
+  isDeleting.value = true;
+  try {
+    await deleteSegment(projectId, deletingSegment.value.id);
+    segments.value = segments.value.filter((s) => s.id !== deletingSegment.value!.id);
+    closeDeleteConfirm();
+  } catch {
+    showError('Failed to delete segment. Please try again.');
+  } finally {
+    isDeleting.value = false;
+  }
+}
+
+function formatDate(iso: string): string {
+  return new Date(iso).toLocaleDateString(undefined, { month: 'short', day: 'numeric', year: 'numeric' });
+}
 </script>
diff --git a/src/admin/tests/unit/components/segments/SegmentEditor.spec.ts b/src/admin/tests/unit/components/segments/SegmentEditor.spec.ts
new file mode 100644
index 0000000..ed673e9
--- /dev/null
+++ b/src/admin/tests/unit/components/segments/SegmentEditor.spec.ts
@@ -0,0 +1,148 @@
+import { describe, it, expect, beforeEach, jest } from '@jest/globals';
+import { mount, flushPromises, type VueWrapper } from '@vue/test-utils';
+import { setActivePinia, createPinia } from 'pinia';
+import { createRouter, createMemoryHistory } from 'vue-router';
+import SegmentEditor from '@/components/segments/SegmentEditor.vue';
+import { useContextStore } from '@/stores/context';
+import type { ProjectResponse, SegmentResponse } from '@/types/api';
+
+jest.mock('@/api/segments');
+jest.mock('@/api/client', () => ({
+  setAuthTokens: jest.fn(),
+  clearAuthTokens: jest.fn(),
+  getAccessToken: jest.fn(),
+}));
+
+import * as segmentsApi from '@/api/segments';
+
+const mockProject: ProjectResponse = {
+  id: 10, name: 'Website', organizationId: 1, hideDisabledFlags: false, createdAt: '2026-01-01T00:00:00Z',
+};
+
+const mockSegment: SegmentResponse = {
+  id: 1,
+  name: 'beta_users',
+  projectId: 10,
+  createdAt: '2026-01-01T00:00:00Z',
+  rules: [{ type: 'AND', conditions: [{ property: 'plan', operator: 'Equal', value: 'beta' }] }],
+};
+
+const dialogStub = { template: '<div><slot /></div>' };
+
+function mountEditor(props: Record<string, unknown> = {}) {
+  const router = createRouter({ history: createMemoryHistory(), routes: [{ path: '/', component: { template: '<div />' } }] });
+  return mount(SegmentEditor, {
+    props: { modelValue: true, segment: null, ...props },
+    global: { plugins: [router], stubs: { 'v-dialog': dialogStub } },
+  });
+}
+
+describe('SegmentEditor', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia());
+    jest.clearAllMocks();
+    const contextStore = useContextStore();
+    contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+    contextStore.setProject(mockProject);
+  });
+
+  describe('WhenOpenedForCreate', () => {
+    it('ThenEditorIsRendered', () => {
+      const wrapper = mountEditor();
+      expect(wrapper.find('[data-testid="segment-editor"]').exists()).toBe(true);
+    });
+
+    it('ThenTitleShowsCreateSegment', () => {
+      const wrapper = mountEditor();
+      expect(wrapper.text()).toContain('Create Segment');
+    });
+
+    it('ThenNameInputIsEmpty', () => {
+      const wrapper = mountEditor();
+      const nameInput = wrapper.find('[data-testid="segment-name-input"]');
+      expect(nameInput.exists()).toBe(true);
+    });
+
+    it('ThenNoRulesMessageIsShown', () => {
+      const wrapper = mountEditor();
+      expect(wrapper.find('[data-testid="no-rules-message"]').exists()).toBe(true);
+    });
+  });
+
+  describe('WhenOpenedForEdit', () => {
+    it('ThenTitleShowsEditSegment', () => {
+      const wrapper = mountEditor({ segment: mockSegment });
+      expect(wrapper.text()).toContain('Edit Segment');
+    });
+
+    it('ThenFormIsPrePopulatedWithSegmentData', () => {
+      const wrapper = mountEditor({ segment: mockSegment });
+      const nameInput = wrapper.findComponent('[data-testid="segment-name-input"]') as VueWrapper<any>;
+      expect(nameInput.props('modelValue')).toBe(mockSegment.name);
+    });
+
+    it('ThenExistingRulesAreRendered', () => {
+      const wrapper = mountEditor({ segment: mockSegment });
+      expect(wrapper.findComponent({ name: 'RuleGroupEditor' }).exists()).toBe(true);
+    });
+  });
+
+  describe('WhenAddRuleGroupButtonIsClicked', () => {
+    it('ThenARuleGroupEditorIsAdded', async () => {
+      const wrapper = mountEditor();
+
+      await wrapper.find('[data-testid="add-rule-group-btn"]').trigger('click');
+      await wrapper.vm.$nextTick();
+
+      expect(wrapper.findComponent({ name: 'RuleGroupEditor' }).exists()).toBe(true);
+    });
+  });
+
+  describe('WhenSaveIsClickedWithValidData', () => {
+    it('ThenCreateSegmentIsCalledForNewSegment', async () => {
+      const created: SegmentResponse = { id: 99, name: 'new_seg', projectId: 10, createdAt: '2026-01-01T00:00:00Z', rules: [] };
+      jest.mocked(segmentsApi.createSegment).mockResolvedValue(created);
+
+      const wrapper = mountEditor();
+
+      await (wrapper.findComponent('[data-testid="segment-name-input"]') as VueWrapper<any>).vm.$emit('update:modelValue', 'new_seg');
+      await wrapper.find('[data-testid="save-segment-btn"]').trigger('click');
+      await flushPromises();
+
+      expect(segmentsApi.createSegment).toHaveBeenCalledWith(
+        mockProject.id,
+        expect.objectContaining({ name: 'new_seg' }),
+      );
+    });
+
+    it('ThenUpdateSegmentIsCalledForExistingSegment', async () => {
+      const updated = { ...mockSegment, name: 'updated_name' };
+      jest.mocked(segmentsApi.updateSegment).mockResolvedValue(updated);
+
+      const wrapper = mountEditor({ segment: mockSegment });
+
+      await wrapper.find('[data-testid="save-segment-btn"]').trigger('click');
+      await flushPromises();
+
+      expect(segmentsApi.updateSegment).toHaveBeenCalledWith(
+        mockProject.id,
+        mockSegment.id,
+        expect.objectContaining({ name: mockSegment.name }),
+      );
+    });
+
+    it('ThenSavedEventIsEmitted', async () => {
+      const created: SegmentResponse = { id: 99, name: 'new_seg', projectId: 10, createdAt: '2026-01-01T00:00:00Z', rules: [] };
+      jest.mocked(segmentsApi.createSegment).mockResolvedValue(created);
+
+      const wrapper = mountEditor();
+
+      await (wrapper.findComponent('[data-testid="segment-name-input"]') as VueWrapper<any>).vm.$emit('update:modelValue', 'new_seg');
+      await wrapper.find('[data-testid="save-segment-btn"]').trigger('click');
+      await flushPromises();
+
+      expect(wrapper.emitted('saved')).toBeTruthy();
+      expect(wrapper.emitted('saved')![0]).toEqual([created]);
+    });
+  });
+});
diff --git a/src/admin/tests/unit/views/SegmentsView.spec.ts b/src/admin/tests/unit/views/SegmentsView.spec.ts
new file mode 100644
index 0000000..17bd1da
--- /dev/null
+++ b/src/admin/tests/unit/views/SegmentsView.spec.ts
@@ -0,0 +1,232 @@
+import { describe, it, expect, beforeEach, jest } from '@jest/globals';
+import { mount, flushPromises, type VueWrapper } from '@vue/test-utils';
+import { setActivePinia, createPinia } from 'pinia';
+import { createRouter, createMemoryHistory } from 'vue-router';
+import SegmentsView from '@/views/SegmentsView.vue';
+import { useContextStore } from '@/stores/context';
+import type { ProjectResponse, SegmentResponse } from '@/types/api';
+
+jest.mock('@/api/segments');
+jest.mock('@/api/client', () => ({
+  setAuthTokens: jest.fn(),
+  clearAuthTokens: jest.fn(),
+  getAccessToken: jest.fn(),
+}));
+
+import * as segmentsApi from '@/api/segments';
+
+const mockProject: ProjectResponse = {
+  id: 10, name: 'Website', organizationId: 1, hideDisabledFlags: false, createdAt: '2026-01-01T00:00:00Z',
+};
+
+const dialogStub = { template: '<div><slot /></div>' };
+
+const mockSegments: SegmentResponse[] = [
+  {
+    id: 1, name: 'beta_users', projectId: 10, createdAt: '2026-01-01T00:00:00Z',
+    rules: [{ type: 'AND', conditions: [{ property: 'plan', operator: 'Equal', value: 'beta' }] }],
+  },
+  {
+    id: 2, name: 'power_users', projectId: 10, createdAt: '2026-01-01T00:00:00Z',
+    rules: [],
+  },
+];
+
+function mountView() {
+  const router = createRouter({ history: createMemoryHistory(), routes: [{ path: '/', component: { template: '<div />' } }] });
+  return mount(SegmentsView, { global: { plugins: [router], stubs: { 'v-dialog': dialogStub } } });
+}
+
+describe('SegmentsView', () => {
+  beforeEach(() => {
+    setActivePinia(createPinia());
+    jest.clearAllMocks();
+  });
+
+  describe('WhenNoProjectIsSelected', () => {
+    it('ThenEmptyStateIsShown', () => {
+      const wrapper = mountView();
+      expect(wrapper.find('[data-testid="segments-table"]').exists()).toBe(false);
+      expect(wrapper.text()).toContain('Select a project');
+    });
+
+    it('ThenCreateButtonIsNotVisible', () => {
+      const wrapper = mountView();
+      expect(wrapper.find('[data-testid="create-segment-btn"]').exists()).toBe(false);
+    });
+  });
+
+  describe('WhenProjectIsSelected', () => {
+    it('ThenSegmentsAreLoaded', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue(mockSegments);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      mountView();
+      await flushPromises();
+
+      expect(segmentsApi.listSegments).toHaveBeenCalledWith(mockProject.id);
+    });
+
+    it('ThenSegmentsTableIsRendered', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue(mockSegments);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      expect(wrapper.find('[data-testid="segments-table"]').exists()).toBe(true);
+      expect(wrapper.find('[data-testid="create-segment-btn"]').exists()).toBe(true);
+    });
+
+    it('ThenSegmentNamesAreDisplayed', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue(mockSegments);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      expect(wrapper.text()).toContain('beta_users');
+      expect(wrapper.text()).toContain('power_users');
+    });
+  });
+
+  describe('WhenCreateButtonIsClicked', () => {
+    it('ThenSegmentEditorIsOpened', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue([]);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      await wrapper.find('[data-testid="create-segment-btn"]').trigger('click');
+      await wrapper.vm.$nextTick();
+
+      const editor = wrapper.findComponent({ name: 'SegmentEditor' });
+      expect(editor.exists()).toBe(true);
+    });
+  });
+
+  describe('WhenEditButtonIsClicked', () => {
+    it('ThenSegmentEditorIsOpenedWithSegment', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue(mockSegments);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      await wrapper.find('[data-testid="edit-segment-1"]').trigger('click');
+      await wrapper.vm.$nextTick();
+
+      const editor = wrapper.findComponent({ name: 'SegmentEditor' });
+      expect(editor.props('segment')).toEqual(mockSegments[0]);
+    });
+  });
+
+  describe('WhenDeleteConfirmationIsCompleted', () => {
+    it('ThenDeleteSegmentIsCalledWhenNameMatches', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue([...mockSegments]);
+      jest.mocked(segmentsApi.deleteSegment).mockResolvedValue(undefined);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      await wrapper.find('[data-testid="delete-segment-1"]').trigger('click');
+      await wrapper.vm.$nextTick();
+
+      expect(wrapper.find('[data-testid="delete-confirm-dialog"]').exists()).toBe(true);
+
+      // Confirm button should be disabled before typing the name
+      expect(wrapper.find('[data-testid="confirm-delete-btn"]').attributes('disabled')).toBeDefined();
+
+      // Type segment name to enable button
+      await (wrapper.findComponent('[data-testid="delete-confirm-input"]') as VueWrapper<any>).vm.$emit('update:modelValue', 'beta_users');
+      await wrapper.vm.$nextTick();
+
+      await wrapper.find('[data-testid="confirm-delete-btn"]').trigger('click');
+      await flushPromises();
+
+      expect(segmentsApi.deleteSegment).toHaveBeenCalledWith(mockProject.id, 1);
+    });
+
+    it('ThenSegmentIsRemovedFromListAfterDeletion', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue([...mockSegments]);
+      jest.mocked(segmentsApi.deleteSegment).mockResolvedValue(undefined);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      await wrapper.find('[data-testid="delete-segment-1"]').trigger('click');
+      await wrapper.vm.$nextTick();
+
+      await (wrapper.findComponent('[data-testid="delete-confirm-input"]') as VueWrapper<any>).vm.$emit('update:modelValue', 'beta_users');
+      await wrapper.vm.$nextTick();
+
+      await wrapper.find('[data-testid="confirm-delete-btn"]').trigger('click');
+      await flushPromises();
+
+      expect(wrapper.text()).not.toContain('beta_users');
+    });
+  });
+
+  describe('WhenSegmentIsSaved', () => {
+    it('ThenNewSegmentIsAddedToList', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue([]);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      const newSegment: SegmentResponse = { id: 99, name: 'new_segment', projectId: 10, createdAt: '2026-01-01T00:00:00Z', rules: [] };
+
+      await wrapper.findComponent({ name: 'SegmentEditor' }).vm.$emit('saved', newSegment);
+      await wrapper.vm.$nextTick();
+
+      expect(wrapper.text()).toContain('new_segment');
+    });
+
+    it('ThenExistingSegmentIsUpdatedInList', async () => {
+      jest.mocked(segmentsApi.listSegments).mockResolvedValue([...mockSegments]);
+
+      const contextStore = useContextStore();
+      contextStore.setOrganization({ id: 1, name: 'Acme', createdAt: '' });
+      contextStore.setProject(mockProject);
+
+      const wrapper = mountView();
+      await flushPromises();
+
+      const updated: SegmentResponse = { ...mockSegments[0], name: 'updated_segment' };
+
+      await wrapper.findComponent({ name: 'SegmentEditor' }).vm.$emit('saved', updated);
+      await wrapper.vm.$nextTick();
+
+      expect(wrapper.text()).toContain('updated_segment');
+      expect(wrapper.text()).not.toContain('beta_users');
+    });
+  });
+});