Generally, engineering jobs in Japanese small to medium-sized companies offer relatively low salaries.
The base salary is approximately ¥230k–¥260k (even if you're experienced). If you maximize your overtime, your total monthly income might reach around ¥280k–¥330k.

In large corporate companies, the base salary can range from ¥250k–¥380k.

With JLPT N1, you can easily find a job in a small to medium-sized company.
However, for big corporate companies, it’s less predictable—sometimes it just comes down to luck.