diff --git a/frontend/src/components/BountySubmitModal.demo.tsx b/frontend/src/components/BountySubmitModal.demo.tsx
new file mode 100644
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+++ b/frontend/src/components/BountySubmitModal.demo.tsx
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+'use client';
+
+import React, { useState } from 'react';
+import { BountySubmitModal } from './BountySubmitModal';
+
+/**
+ * Demo page for Bounty Submission UI Flow.
+ * Shows a button that opens the submission modal.
+ */
+export default function BountySubmitDemo(): JSX.Element {
+  const [isOpen, setIsOpen] = useState(false);
+
+  return (
+    <div className="p-8 max-w-2xl mx-auto space-y-6">
+      <div>
+        <h1 className="text-2xl font-bold text-gray-900 dark:text-white">
+          Interactive Bounty Submission
+        </h1>
+        <p className="text-sm text-gray-500 mt-1">
+          Multi-step form with dynamic link management and confirmation step.
+        </p>
+      </div>
+
+      {/* Trigger button */}
+      <div className="flex gap-3 p-6 bg-white rounded-xl border border-gray-200 dark:bg-gray-900 dark:border-gray-800">
+        <button
+          onClick={() => setIsOpen(true)}
+          className="px-5 py-2.5 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors text-sm font-medium"
+        >
+          📝 Open Submission Form
+        </button>
+        <p className="text-sm text-gray-500 flex items-center">
+          Click to open the bounty submission modal
+        </p>
+      </div>
+
+      {/* The modal */}
+      <BountySubmitModal
+        isOpen={isOpen}
+        onClose={() => setIsOpen(false)}
+        bountyTitle="Implement User Authentication"
+      />
+    </div>
+  );
+}
diff --git a/frontend/src/components/BountySubmitModal.tsx b/frontend/src/components/BountySubmitModal.tsx
new file mode 100644
index 0000000..e207eed
--- /dev/null
+++ b/frontend/src/components/BountySubmitModal.tsx
@@ -0,0 +1,245 @@
+'use client';
+
+import React, { useState } from 'react';
+import { useForm, useFieldArray, watch } from 'react-hook-form';
+import { Modal } from '@/components/ui/Modal';
+import { Plus, Trash2, Send, ArrowLeft, CheckCircle2 } from 'lucide-react';
+import { cn } from '@/lib/utils';
+
+interface BountySubmissionForm {
+  prUrl: string;
+  notes: string;
+  externalLinks: { url: string }[];
+}
+
+type Step = 'form' | 'confirm' | 'success';
+
+interface BountySubmitModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  bountyTitle?: string;
+}
+
+/**
+ * Interactive Bounty Submission UI Flow
+ *
+ * Multi-step modal form for submitting bounty completion proof.
+ * Uses react-hook-form with useFieldArray for dynamic link management.
+ * Steps: Form → Confirmation → Success
+ */
+export function BountySubmitModal({
+  isOpen,
+  onClose,
+  bountyTitle = 'Open Bounty',
+}: BountySubmitModalProps): JSX.Element {
+  const [step, setStep] = useState<Step>('form');
+
+  const {
+    register,
+    control,
+    handleSubmit,
+    formState: { errors },
+    watch: watchFn,
+    reset,
+  } = useForm<BountySubmissionForm>({
+    defaultValues: {
+      prUrl: '',
+      notes: '',
+      externalLinks: [{ url: '' }],
+    },
+  });
+
+  const { fields, append, remove } = useFieldArray({
+    control,
+    name: 'externalLinks',
+  });
+
+  // Watch values for confirmation step
+  const watchedPrUrl = watchFn('prUrl');
+  const watchedNotes = watchFn('notes');
+  const watchedLinks = watchFn('externalLinks');
+
+  const onSubmit = (data: BountySubmissionForm) => {
+    console.log('[BountySubmit] Submission data:', data);
+    setStep('confirm');
+  };
+
+  const confirmSubmission = () => {
+    console.log('[BountySubmit] Confirmed and submitted!');
+    setStep('success');
+  };
+
+  const handleClose = () => {
+    setStep('form');
+    reset();
+    onClose();
+  };
+
+  // Success state
+  if (step === 'success') {
+    return (
+      <Modal isOpen={isOpen} onClose={handleClose} title="Submission Received" size="sm">
+        <div className="flex flex-col items-center py-8 text-center">
+          <CheckCircle2 className="w-16 h-16 text-green-500 mb-4" />
+          <h3 className="text-lg font-semibold text-gray-900 dark:text-white mb-2">
+            Thank you!
+          </h3>
+          <p className="text-sm text-gray-500 dark:text-gray-400 max-w-sm">
+            Your bounty submission has been received. Guild admins will review
+            your PR and get back to you soon.
+          </p>
+          <button
+            onClick={handleClose}
+            className="mt-6 px-5 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors text-sm font-medium"
+          >
+            Done
+          </button>
+        </div>
+      </Modal>
+    );
+  }
+
+  return (
+    <Modal
+      isOpen={isOpen}
+      onClose={handleClose}
+      title={
+        step === 'confirm' ? 'Confirm Submission' : `Submit: ${bountyTitle}`
+      }
+      size="lg"
+    >
+      {step === 'form' ? (
+        <form onSubmit={handleSubmit(onSubmit)} className="space-y-5 p-2">
+          {/* GitHub PR URL */}
+          <div>
+            <label htmlFor="pr-url" className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1.5">
+              GitHub PR URL <span className="text-red-500">*</span>
+            </label>
+            <input
+              id="pr-url"
+              type="url"
+              placeholder="https://github.com/owner/repo/pull/123"
+              {...register('prUrl', {
+                required: 'PR URL is required',
+                pattern: {
+                  value: /^https:\/\/github\.com\/.+\/.+\/pull\/\d+/i,
+                  message: 'Please enter a valid GitHub PR URL',
+                },
+              })}
+              className={cn(
+                'w-full rounded-lg border px-3 py-2 text-sm focus:ring-2 focus:ring-blue-500 dark:bg-gray-800 dark:text-white',
+                errors.prUrl
+                  ? 'border-red-400 focus:border-red-500'
+                  : 'border-gray-300 focus:border-blue-500',
+              )}
+            />
+            {errors.prUrl && (
+              <p className="mt-1 text-xs text-red-500">{errors.prUrl.message}</p>
+            )}
+          </div>
+
+          {/* Additional Notes */}
+          <div>
+            <label htmlFor="notes" className="block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1.5">
+              Additional Notes
+            </label>
+            <textarea
+              id="notes"
+              rows={3}
+              placeholder="Describe what you implemented and any relevant details..."
+              {...register('notes')}
+              className="w-full rounded-lg border border-gray-300 px-3 py-2 text-sm focus:border-blue-500 focus:ring-2 focus:ring-blue-500 dark:border-gray-600 dark:bg-gray-800 dark:text-white resize-none"
+            />
+          </div>
+
+          {/* Dynamic External Links */}
+          <div>
+            <div className="flex items-center justify-between mb-2">
+              <label className="block text-sm font-medium text-gray-700 dark:text-gray-300">
+                External Links
+              </label>
+              <button
+                type="button"
+                onClick={() => append({ url: '' })}
+                className="inline-flex items-center gap-1 text-xs font-medium text-blue-600 hover:text-blue-700"
+              >
+                <Plus size={14} /> Add Link
+              </button>
+            </div>
+            <div className="space-y-2">
+              {fields.map((field, index) => (
+                <div key={field.id} className="flex gap-2">
+                  <input
+                    type="url"
+                    placeholder="https://..."
+                    {...register(`externalLinks.${index}.url`)}
+                    className="flex-1 rounded-lg border border-gray-300 px-3 py-2 text-sm focus:border-blue-500 focus:ring-1 focus:ring-blue-500 dark:border-gray-600 dark:bg-gray-800 dark:text-white"
+                  />
+                  {fields.length > 1 && (
+                    <button
+                      type="button"
+                      onClick={() => remove(index)}
+                      className="p-2 text-red-400 hover:text-red-600 hover:bg-red-50 rounded-lg transition-colors"
+                      aria-label="Remove link"
+                    >
+                      <Trash2 size={16} />
+                    </button>
+                  )}
+                </div>
+              ))}
+            </div>
+          </div>
+
+          <div className="flex justify-end pt-2">
+            <button
+              type="submit"
+              className="inline-flex items-center gap-2 px-4 py-2.5 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors text-sm font-medium"
+            >
+              <Send size={16} /> Review Submission
+            </button>
+          </div>
+        </form>
+      ) : (
+        /* Confirmation step */
+        <div className="p-2 space-y-4">
+          <div className="bg-amber-50 border border-amber-200 rounded-lg p-4 dark:bg-amber-900/10 dark:border-amber-800">
+            <p className="text-sm text-amber-800 dark:text-amber-200 font-medium">
+              ⚠️ Are you sure? Once submitted, this cannot be edited.
+            </p>
+          </div>
+
+          <div className="space-y-2 text-sm text-gray-600 dark:text-gray-400">
+            <p>
+              <span className="font-medium">PR URL:</span>{' '}
+              <code className="bg-gray-100 px-1.5 py-0.5 rounded text-xs dark:bg-gray-800 break-all">
+                {watchedPrUrl || '—'}
+              </code>
+            </p>
+            <p>
+              <span className="font-medium">Notes:</span> {watchedNotes || '—'}
+            </p>
+            <p>
+              <span className="font-medium">External Links:</span>{' '}
+              {watchedLinks?.filter((l) => l.url).length || 0} link(s)
+            </p>
+          </div>
+
+          <div className="flex justify-between pt-2">
+            <button
+              onClick={() => setStep('form')}
+              className="inline-flex items-center gap-1.5 px-4 py-2 text-sm font-medium text-gray-600 hover:text-gray-900 dark:text-gray-400"
+            >
+              <ArrowLeft size={16} /> Back
+            </button>
+            <button
+              onClick={confirmSubmission}
+              className="px-5 py-2 bg-green-600 text-white rounded-lg hover:bg-green-700 transition-colors text-sm font-medium inline-flex items-center gap-1.5"
+            >
+              <CheckCircle2 size={16} /> Confirm & Submit
+            </button>
+          </div>
+        </div>
+      )}
+    </Modal>
+  );
+}