Type
JetBrains Mono, by JetBrains, under the SIL Open Font License 1.1: the terminal screens and every monospaced line. Instrument Sans, by Instrument, under the same license: the rest of the text.
Terminal screens
Every terminal screen on this site is drawn by MendCode's own TUI code. Apart from the recorded pull request review, the sessions, files and numbers in them are examples.