diff --git a/AINative_OKR_CASAN5/Dockerfile.backend b/AINative_OKR_CASAN5/Dockerfile.backend
index f743517..8e6c336 100644
--- a/AINative_OKR_CASAN5/Dockerfile.backend
+++ b/AINative_OKR_CASAN5/Dockerfile.backend
@@ -29,9 +29,13 @@ COPY backend/package.json ./backend/
 COPY frontend/package.json ./frontend/
 COPY backend/prisma ./backend/prisma
 
-RUN npm ci --ignore-scripts
-
-RUN cd backend && npx prisma generate
+# Reuse the builder's node_modules: it already contains bcrypt's compiled
+# native addon (built WITH install scripts) and the generated Prisma client.
+# A fresh `npm ci --ignore-scripts` here omits bcrypt's *.node binary, so the
+# app crash-loops at runtime ("Cannot find module .../bcrypt_lib.node") — both
+# the seed and NestJS auth require bcrypt. builder and runtime share the same
+# node:20-slim base, so the native binaries are ABI/platform-compatible.
+COPY --from=builder /app/node_modules ./node_modules
 
 COPY --from=builder /app/backend/dist ./backend/dist
 COPY backend/entrypoint.sh /entrypoint.sh