diff --git a/packages/api/src/api/project/contributors/put.ts b/packages/api/src/api/project/contributors/put.ts
index e3cd858c2..ec7098b62 100644
--- a/packages/api/src/api/project/contributors/put.ts
+++ b/packages/api/src/api/project/contributors/put.ts
@@ -15,8 +15,10 @@ export const put = async (req: Request, res: Response) => {
   });
   if (errorHandled) return;
 
-  const project = await entityManager.findOneOrFail(Project, { id: data.projectId });
-  if (project.inviteCode !== data.inviteCode) {
+  let project: Project;
+  try {
+    project = await entityManager.findOneOrFail(Project, { inviteCode: data.inviteCode });
+  } catch {
     res.sendStatus(404);
     return;
   }
diff --git a/packages/api/tests/api/project/contributors/put.test.ts b/packages/api/tests/api/project/contributors/put.test.ts
index a55ece8a5..953abfd4f 100644
--- a/packages/api/tests/api/project/contributors/put.test.ts
+++ b/packages/api/tests/api/project/contributors/put.test.ts
@@ -7,7 +7,7 @@ import { validatePayload } from '../../../../src/utils/validatePayload';
 
 jest.mock('../../../../src/utils/validatePayload');
 const validatePayloadMock = getMock(validatePayload);
-const validPayload = { projectId: '1', inviteCode: '00000000-0000-0000-0000-000000000000' };
+const validPayload = { inviteCode: '00000000-0000-0000-0000-000000000000' };
 const mockUser = { id: '1' };
 
 describe('project contributors put endpoint', () => {
@@ -27,21 +27,6 @@ describe('project contributors put endpoint', () => {
     expect(res.send).toHaveBeenCalledWith(mockProject);
   });
 
-  it('should return 404 if the invite code is invalid', async () => {
-    validatePayloadMock.mockReturnValueOnce({ errorHandled: false, data: validPayload } as any);
-    const req = createMockRequest({ user: mockUser, ...validPayload } as any);
-    const res = createMockResponse();
-    const mockProject = { inviteCode: 'invalid', contributors: { add: jest.fn() } };
-    req.entityManager.findOneOrFail.mockResolvedValueOnce(mockProject);
-
-    await put(req as any, res as any);
-
-    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, { id: validPayload.projectId });
-    expect(mockProject.contributors.add).not.toBeCalled();
-    expect(req.entityManager.persist).not.toBeCalled();
-    expect(res.sendStatus).toHaveBeenCalledWith(404);
-  });
-
   it('should return 409 if the user is already a contributor', async () => {
     validatePayloadMock.mockReturnValueOnce({ errorHandled: false, data: validPayload } as any);
     const req = createMockRequest({ user: mockUser, ...validPayload } as any);
@@ -52,7 +37,9 @@ describe('project contributors put endpoint', () => {
 
     await put(req as any, res as any);
 
-    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, { id: validPayload.projectId });
+    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, {
+      inviteCode: validPayload.inviteCode,
+    });
     expect(mockProject.contributors.add).not.toBeCalled();
     expect(req.entityManager.persist).not.toBeCalled();
     expect(res.sendStatus).toHaveBeenCalledWith(409);
@@ -68,7 +55,9 @@ describe('project contributors put endpoint', () => {
 
     await put(req as any, res as any);
 
-    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, { id: validPayload.projectId });
+    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, {
+      inviteCode: validPayload.inviteCode,
+    });
     expect(mockProject.contributors.add).not.toBeCalled();
     expect(req.entityManager.persist).not.toBeCalled();
     expect(res.sendStatus).toHaveBeenCalledWith(423);
@@ -84,7 +73,9 @@ describe('project contributors put endpoint', () => {
 
     await put(req as any, res as any);
 
-    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, { id: validPayload.projectId });
+    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, {
+      inviteCode: validPayload.inviteCode,
+    });
     expect(mockProject.contributors.add).not.toBeCalled();
     expect(req.entityManager.persist).not.toBeCalled();
     expect(res.sendStatus).toHaveBeenCalledWith(500);
@@ -105,15 +96,13 @@ describe('project contributors put endpoint', () => {
     validatePayloadMock.mockReturnValueOnce({ errorHandled: false, data: validPayload } as any);
     const req = createMockRequest({ user: mockUser, ...validPayload } as any);
     const res = createMockResponse();
-    req.entityManager.findOneOrFail.mockResolvedValueOnce({
-      ...validPayload,
-      inviteCode: '2',
-    } as any);
     req.entityManager.findOneOrFail.mockRejectedValueOnce({ name: 'NotFoundError' });
 
     await put(req as any, res as any);
 
-    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, { id: validPayload.projectId });
+    expect(req.entityManager.findOneOrFail).toBeCalledWith(Project, {
+      inviteCode: validPayload.inviteCode,
+    });
     expect(res.sendStatus).toHaveBeenCalledWith(404);
   });
 });
diff --git a/packages/shared/src/schema/project/contributors/put.ts b/packages/shared/src/schema/project/contributors/put.ts
index 3f51a784b..6928e20af 100644
--- a/packages/shared/src/schema/project/contributors/put.ts
+++ b/packages/shared/src/schema/project/contributors/put.ts
@@ -1,6 +1,5 @@
 import { z } from 'zod';
 
 export const put = z.object({
-  projectId: z.string(),
   inviteCode: z.string().uuid(),
 });
diff --git a/packages/shared/tests/schema/project/contributors/put.test.ts b/packages/shared/tests/schema/project/contributors/put.test.ts
index 63ba767cf..061311682 100644
--- a/packages/shared/tests/schema/project/contributors/put.test.ts
+++ b/packages/shared/tests/schema/project/contributors/put.test.ts
@@ -11,15 +11,6 @@ describe('project contributors put schema', () => {
     expect(Schema.project.contributors.put.safeParse(validPut).success).toBe(true);
   });
 
-  it('does not validate an object with an invalid projectId', () => {
-    expect(
-      Schema.project.contributors.put.safeParse({
-        ...validPut,
-        projectId: 1,
-      }).success,
-    ).toBe(false);
-  });
-
   it('does not validate an object with an invalid inviteCode', () => {
     expect(
       Schema.project.contributors.put.safeParse({
diff --git a/packages/web/src/components/useProjectInviteCodeHandler/index.ts b/packages/web/src/components/useProjectInviteCodeHandler/index.ts
new file mode 100644
index 000000000..18624042b
--- /dev/null
+++ b/packages/web/src/components/useProjectInviteCodeHandler/index.ts
@@ -0,0 +1 @@
+export * from './useProjectInviteCodeHandler';
diff --git a/packages/web/src/components/useProjectInviteCodeHandler/useProjectInviteCodeHandler.tsx b/packages/web/src/components/useProjectInviteCodeHandler/useProjectInviteCodeHandler.tsx
new file mode 100644
index 000000000..ceb690581
--- /dev/null
+++ b/packages/web/src/components/useProjectInviteCodeHandler/useProjectInviteCodeHandler.tsx
@@ -0,0 +1,60 @@
+import { useEffect } from 'react';
+import { useRouter } from 'next/router';
+import axios from 'axios';
+import { useUserStore } from '../../stores/user';
+import { openErrorToast, openSuccessToast } from '../utils/CustomToast';
+import { useRedirectToAuth } from '../layout/RedirectToAuthModal';
+
+const toasts = {
+  Success: () =>
+    openSuccessToast({
+      title: `Registration successful!`,
+      description: "You're all set! 🚀",
+    }),
+  Invalid: () =>
+    openErrorToast({
+      title: 'Invalid invite code',
+      description: 'Please check your invite code and try again.',
+    }),
+  ProjectExists: () =>
+    openErrorToast({
+      title: 'Project already exists',
+      description: 'You already have a project.',
+    }),
+};
+
+const useProjectInviteCodeHandler = () => {
+  const router = useRouter();
+  const { triggerRedirect } = useRedirectToAuth();
+  const { user, doneLoading: userLoaded } = useUserStore();
+  const { projectInviteCode } = router.query;
+
+  useEffect(() => {
+    if (!userLoaded || !projectInviteCode) return;
+    if (!user) {
+      triggerRedirect({ returnTo: `/?projectInviteCode=${projectInviteCode}` });
+      return;
+    }
+    if (user?.project) {
+      toasts.ProjectExists();
+      return;
+    }
+
+    void (async () => {
+      let project;
+      try {
+        project = (await axios.put(`/api/project/contributors`, { inviteCode: projectInviteCode }))
+          .data;
+      } catch {
+        toasts.Invalid();
+        return;
+      }
+      toasts.Success();
+
+      await useUserStore.getState().fetchUser();
+      void router.push(`/project/${project.id}`);
+    })();
+  }, [projectInviteCode, userLoaded, triggerRedirect]); // eslint-disable-line react-hooks/exhaustive-deps
+};
+
+export { useProjectInviteCodeHandler };
diff --git a/packages/web/src/pages/index.tsx b/packages/web/src/pages/index.tsx
index 2149b49d0..5ab154e75 100644
--- a/packages/web/src/pages/index.tsx
+++ b/packages/web/src/pages/index.tsx
@@ -6,8 +6,10 @@ import { PageContainer } from '../components/layout/PageContainer';
 import { Prizes } from '../components/Prizes';
 import { usePrizesStore } from '../stores/prizes';
 import { ProjectRegistrationCTA } from '../components/ProjectRegistrationCTA';
+import { useProjectInviteCodeHandler } from '../components/useProjectInviteCodeHandler';
 
 const Home: NextPage = () => {
+  useProjectInviteCodeHandler();
   const { doneLoading: prizesFetched } = usePrizesStore();
   React.useEffect(() => {
     const { prizes } = usePrizesStore.getState();