Someone needs to make the obligatory "Wordle clone in 50,000 lines of react/java/nosql/docker/terraform/documentation/7GB of unused dependencies" :)
Needs to be microservice-based, obv. A word finder service, a word checker service and a few others for good measure. Reactive architecture, probably Kafka based, for resilience. Also GDPR compliant, CI/CD pipeline, distributed tracing, all major languages covered, dev, staging and production environments.
Bonus points for Java spring, React and Redux.
A little knowledge is a dangerous thing.
¹ Written in Rust here: https://github.com/mTvare6/hello-world.rs