Job title: Senior Software Engineer
Job description: Build ERP web application using ASP.net & VB.net for my company's client. My job scopes include get requirements from client, analyse, coding from scratch, testing, implementing, debugging, supporting, enhancing, and get new requirements, repeat the cycle (yes, it never end...).
Years spent in company: 3 yrs + 5 months
Company: private (less then 10 staffs include the boss)
Industry: IT
Tenure: Permanent
Employment level: Senior
Experience before joining: fresh grad
Salary: salary + project allowance RM3.9k (2 weeks bonus per year)
Location: PJ
Gender: Female
Extra info: Married early of this year, and have a baby.

I don't have any senior that can teach me anything, and company didn't sent me to any training to enhance my skill, so I learn everything required for my job myself through google. But my boss is very nice and that is why i staying here for so long. But recently, my friends in same field as me told me that I should jump as my knowledge wont have much value if I staying in a same company doing same project for too long...
so what you guys think? By the way, I am underpaid?