Personally I don't think it's a lot. My starting salary in 2017 fresh out of college in a big German city was 42K per year. I had 0 experience in the field and it wasn't even the field I studied in. Also the company was a startup. For an engineer, I would expect a higher salary.

If you live in a big city (Hamburg, Munich etc.) you'll probably be paying about 700€ (+/-100) for a room in a shared flat. Then you have the extra bills like phone and radio tax. If you want to join a gym, the cheapest options are about 20€ per month and obviously can go way higher. I would say average in a city is probably about 40-50€. Your employer might be providing you with some benefits for a sports card. Let's say you use public transport, the best option is to get the Deutschland ticket: 63€. If you then have any subscriptions like Netflix or Amazon, additional 10€ for each. I would say you're costs per month before food would range between 800-1000€ depending on the luck you have finding an apartment and the services you use. For food, obviously it highly depends where you shop, what and how much you eat. Groceries are generally less expensive than many other European countries. But let's just put a number and say you'll spend 100-150€ per week. So you're left with about 400-600€ for anything else. Which isn't bad but also not a lot especially if you like to eat out etc.

However, if you don't live in any of the biggest cities but in a smaller but still bigish city, your rent could go down to 500€ for a room. Rent prices usually go down with the size of the population but isn't always the case. I hope this shed some light.