diff --git a/src/entities/project/project.ts b/src/entities/project/project.ts
new file mode 100644
index 0000000..46a5251
--- /dev/null
+++ b/src/entities/project/project.ts
@@ -0,0 +1,35 @@
+import {
+  addDoc,
+  collection,
+  doc,
+  getDoc,
+  setDoc,
+} from "firebase/firestore/lite";
+
+import { db } from "@shared/firebase/firebase";
+
+export async function getComments() {
+  const docRef = doc(db, "coments", "test");
+  const docSnap = await getDoc(docRef);
+
+  if (!docSnap.exists()) {
+    console.log("No such document!");
+    return null;
+  }
+
+  return docSnap.data();
+}
+
+export async function updateTitle(newTitle: string) {
+  const docRef = doc(db, "coments", "test");
+  await setDoc(docRef, { title: newTitle }, { merge: true });
+  console.log("문서가 새로 작성되거나 덮어쓰기 됐어요.");
+}
+
+export async function addPost(title: string) {
+  const postsRef = collection(db, "posts");
+  const docRef = await addDoc(postsRef, {
+    title,
+  });
+  return docRef.id;
+}
diff --git a/src/shared/firebase/firebase.ts b/src/shared/firebase/firebase.ts
new file mode 100644
index 0000000..2997d57
--- /dev/null
+++ b/src/shared/firebase/firebase.ts
@@ -0,0 +1,15 @@
+import { initializeApp } from "firebase/app";
+import { getFirestore } from "firebase/firestore/lite";
+
+const firebaseConfig = {
+  apiKey: process.env.REACT_APP_API_KEY,
+  authDomain: process.env.REACT_APP_AUTH_DOMAIN,
+  projectId: process.env.REACT_APP_PROJECT_ID,
+  storageBucket: process.env.REACT_APP_STORAGE_BUCKET,
+  messagingSenderId: process.env.REACT_APP_MESSAGEINGSENDER_ID,
+  appId: process.env.REACT_APP_APP_ID,
+  measurementId: process.env.REACT_APP_MEASUREMENT_ID,
+};
+
+const app = initializeApp(firebaseConfig);
+export const db = getFirestore(app);