I wonder if it is possible to "code" a TTF/OTF/SVG font? Somehow write in all the cordinates for each letter.
If so, where can I learn more about it?
It's certainly possible. SVG and SVG Fonts are both XML documents. So, assuming you have a way to lay out the letter forms in SVG-compatible shapes, the rest should be straightforward, assuming good XML support.
You can then use FontForge to convert to other formats.
Edit: Another question produced a manual way to produce SVG Fonts, which should be useful in guiding the design of a program to do so.