Font-engineerings is a synonym for font-mastering and vice versa.
Type is a great example where design meets technology. Every font from nowadays is a piece of software, with unicode mappings, axis locations, style-linking, font embedding, hinting information, glyph substitutions and also with glyphs (or in other words: points with x and y coordinates). This font software will be installed on a digital devices like computers, smartphones, cars, dryers, printing machines or any other device which requires text to be rendered – which is almost every device in the world.
And that's why it's important to care about the technical settings within a font software as well – we make sure, that fonts simply work.
If you have ever struggled with: 'my font doesn’t work in Word', 'kerning does not work in PowerPoint', 'glyph interpolation issues' or even more complex issues like 'how do I build a proper STAT table for my variable font', 'complex OpenType features' or 'why is there a vhea table in my latin fonts?' or you wanted to fix the vertical metrics, but you don't know how? – then: