Not to any detailed extent. Oh sure, you might be able to tell if the developer is literally doing nothing due to incompetence or laziness ala Paula Bean: http

Not to any detailed extent. Oh sure, you might be able to tell if the developer is literally doing nothing due to incompetence or laziness ala Paula Bean: https://thedailywtf.com/articles/The_Brillant_Paula_Bean https://thedailywtf.com/articles/The_Brillant_Paula_Bean But when there's a semblance of competence, then telling how productive a developer is isn't all too practical. Lines of code? A good developer will be just as likely to remove unnecessary lines that already exist as they will add new ones. Git commits? A look at any major open source event offering t-shirts for contributions can show you how that can be gamed. Tasks done on time? Nope, planning is often flawed at best. It's not like a production line.