3% currency fluctuation in a month is high, but it's more of a random fluke. In the long term I'd expect the trend to be mostly interest rate diff - around 2% per year for EUR/USD.

You should be a lot more concerned about the crazy price frenzy going on with asset prices: stock market doubled in a year, real estate prices break new highs every month, even food prices are all time high apparently. You've lost way more than 3% of your purchasing power there already.

if 3% is a concern, just get a local job. Working for a company in a different country has many challenges. 3% currency exchange is nothing. This may go up or down way more, you may also face additional taxes or filing requirements.

Perhaps you should consider negotiating a higher salary.

One of the attractions of tech jobs in the US is that their salaries tend to be a fair bit higher than in Europe, so if you're already earning the same amount, it might be worth it to research what other people in similar positions are earning in that area.

Another thing you might consider is getting a bank account denominated in US Dollars, and finding a method of transferring the money that has a lower spread and / or lower fees. But currency fluctuations between USD and your local currency may still be much greater than 3%, which could have a significant impact.

3% is nothing. Look at historical charts, you are basically gambling 20% of your salary.

https://www.xe.com/currencycharts/?from=USD&to=EUR&view=5Y