  In software engineering, it is not enough to simply write code that only
works as intended, even if it is free from vulnerabilities and bugs. Every
programming language has a style guide and a set of best practices defined by
its community, which help practitioners to build solutions that have a clear
structure and therefore are easy to read and maintain. To introduce assessment
of code quality into the educational process, we developed a tool called
Hyperstyle. To make it reflect the needs of the programming community and at
the same time be easily extendable, we built it upon several existing
professional linters and code checkers. Hyperstyle supports four programming
languages (Python, Java, Kotlin, and Javascript) and can be used as a
standalone tool or integrated into a MOOC platform. We have integrated the tool
into two educational platforms, Stepik and JetBrains Academy, and it has been
used to process about one million submissions every week since May 2021.
