99% of software development jobs are not as groundbreaking as this. It’s mostly companies doing exactly what their competitors are doing. Very few places are actually doing things that an LLM model has truly never seen crawling through GutHub. Even new innovative products generally boil down to the same database fetches and CRUD glue and JSON parsing and front end form filling code.
The simplest version of that is some CGI code a PHP script. Which everyone should be writing according to your description. But why so many books have been written to be able to do this seemingly simple task? So many frameworks, so many patterns, so many methodologies....
It can't do anything in these random Phaser games I'm making and even translating my 10,000 line XNA game to Phaser. It is totally hopeless.
Phaser has been out forever now, and XNA used to be too.
This is not the case anymore, current SOTA CoT models are not just parroting stuff from the training data. And as of today they are not even trained exclusively on publicly (and not so publicly) available stuff, but they massively use synthetic data which the model itself generated or distilled data from other smarter models.
I'm using and I know plenty of people using AI in current "mature" codebases with great results, this doesn't mean it does the work while you sip a coffee (yet)
*NOTE: my evidence for this is that o3 could not break ARC AGI by parroting, because it's a banchmark made exactly for this reason. Not a coding banchmark per se, but still transposable imo.
It is only generating based on training data. In mature code bases there is a massive amount of interconnected state that is not already present in any github repository. The new logic you'd want to add is likely something never done before. As other programmers have stated, it seems to be improving at generating useful boilerplate and making simple websites and such related to what's out there en masse on Github. But it can't make any meaningful changes in an extensively matured codebase. Even Claude Sonnet is absolutely hopeless at this. And the requirement before the codebase is "matured" is not very high.