Dexter Zhuang, the founder of Money Abroad, has achieved what's known as "Coast FIRE."Courtesy of Dexter ZhuangDexter Zhuang hit "Coast FIRE," meaning he doesn't have to contribute more money to his nest egg.He still has to earn income to cover his daily living expenses and expects to work into his 60s.Coast FIRE, which he hit with a simple strategy, has provided peace of mind and career flexibility.Dexter Zhuang has achieved what's known as "Coast FIRE," an offshoot of the "Financial Independence, Retire Early" movement.It's defined as having enough in your retirement accounts that you don't have to contribute any more money — the current amount will grow and compound enough over time, allowing you to "coast" into retirement.Zhuang, 33, calculated his Coast FIRE number using an online calculator that allows you to input assumptions such as your current age, expected retirement age, annual spending in retirement, and invested assets.