diff --git a/2_frontend/.env.development b/2_frontend/.env.development
new file mode 100644
index 0000000..7eb643f
--- /dev/null
+++ b/2_frontend/.env.development
@@ -0,0 +1,3 @@
+# 개발 서버 전용 — 로그인 폼 기본값 (5_django_backend 시드 계정). 빌드·테스트엔 안 들어감.
+VITE_DEFAULT_LOGIN_EMAIL=admin@codeassist.local
+VITE_DEFAULT_LOGIN_PASSWORD=test1234
diff --git a/2_frontend/src/config/env.ts b/2_frontend/src/config/env.ts
index 9e033f5..c686438 100644
--- a/2_frontend/src/config/env.ts
+++ b/2_frontend/src/config/env.ts
@@ -8,11 +8,16 @@ const envSchema = z.object({
     z.string().regex(/^\/[^\s]*$/, "must be absolute URL or path starting with '/'"),
   ]),
   VITE_ENTRA_GRAPH_SCOPE: z.string().min(1).default("User.Read"),
+  // 개발 편의 — 로그인 폼 기본값. .env.development 에만 두고 빌드/테스트엔 안 들어감.
+  VITE_DEFAULT_LOGIN_EMAIL: z.string().default(""),
+  VITE_DEFAULT_LOGIN_PASSWORD: z.string().default(""),
 })
 
 export interface AppEnv {
   apiBaseUrl: string
   entraGraphScope: string
+  defaultLoginEmail: string
+  defaultLoginPassword: string
 }
 
 export function parseEnv(raw: Record<string, unknown>): AppEnv {
@@ -20,6 +25,8 @@ export function parseEnv(raw: Record<string, unknown>): AppEnv {
   return {
     apiBaseUrl: parsed.VITE_API_BASE_URL,
     entraGraphScope: parsed.VITE_ENTRA_GRAPH_SCOPE,
+    defaultLoginEmail: parsed.VITE_DEFAULT_LOGIN_EMAIL,
+    defaultLoginPassword: parsed.VITE_DEFAULT_LOGIN_PASSWORD,
   }
 }
 
diff --git a/2_frontend/src/features/auth/components/LoginForm.tsx b/2_frontend/src/features/auth/components/LoginForm.tsx
index 12806ef..0542653 100644
--- a/2_frontend/src/features/auth/components/LoginForm.tsx
+++ b/2_frontend/src/features/auth/components/LoginForm.tsx
@@ -11,6 +11,7 @@ import { useLogin } from "../hooks/useLogin"
 import { safeRedirectPath } from "../utils/safeRedirectPath"
 import { ApiError } from "@/lib/api/errors"
 import type { LoginRequest } from "@/types/api"
+import { env } from "@/config/env"
 
 export default function LoginForm() {
   const {
@@ -19,7 +20,8 @@ export default function LoginForm() {
     formState: { errors },
   } = useForm<LoginInput>({
     resolver: zodResolver(loginSchema),
-    defaultValues: { email: "", password: "" },
+    // 개발 서버에선 .env.development 의 기본 계정이 채워져 있어 버튼만 누르면 됨
+    defaultValues: { email: env.defaultLoginEmail, password: env.defaultLoginPassword },
   })
   const login = useLogin()
   const navigate = useNavigate()
@@ -53,7 +55,7 @@ export default function LoginForm() {
         {errors.email && <p className="text-destructive text-sm">{errors.email.message}</p>}
       </div>
       <div className="space-y-2">
-        <Label htmlFor="password">비번</Label>
+        <Label htmlFor="password">비밀번호</Label>
         <Input
           id="password"
           type="password"