We take over software projects that are late, over budget, or abandoned by the people who started them. First a week of assessment, then a written answer: what is salvageable, what has to be rewritten, and what it will cost to finish.
Fixed fee, one week, and the answer is sometimes that the project should be stopped rather than rescued. You get the document either way.
A consultant can tell you what went wrong. An agency will quote you a rebuild. This work needs someone senior making the keep-or-rewrite calls while engineers are already inside the system, which is what the single retainer is for.
“Two prior vendors had given up on it. It was running in production inside six weeks.”
One week, fixed fee, written findings. Including the finding that you should not spend any more money on this.