Out of school for ten years and letters of recommendation for PhD programs
From what you say it is not clear how your current job is related to the PhD you plan to study. But in general, excellent recommendation letter from your working place might be a good complement to two academic letters. At the end, your work did require technical / analytical skills, and those are the skills that will be useful in academia. Had you been a soccer player or dancer, this would have been a different story. Also, probably you can ask your boss to focus on some aspects that you think are important to emphasize (e.g., technical skills).