For what purpose? Are you a small business owner that preparing for going viral one day? Keep improving your system bit by bit. Maybe add a caching layer today

For what purpose? Are you a small business owner that preparing for going viral one day? Keep improving your system bit by bit. Maybe add a caching layer today, load balancer tomorrow, a job queue somewhere down the road and scale up your database now and then. And probably YAGNI imo. If for job hunting, other comments had better suggestion