He may well be on more than £100k as a software engineer, if he's senior/in management, even outside London.
Edit: we have mutual connections. I'd say given his current job title he'll be on a pittance but with exceptional equity in the company, and probably shares in a couple of his previous places.
Edit: we have mutual connections. I'd say given his current job title he'll be on a pittance but with exceptional equity in the company, and probably shares in a couple of his previous places.