About During the Past Years

I am an software engineer.
During the past 7 seven years, I founded two companies with partners. My first company was focused on e-learning, and another was focused on web game.

The important words of a title should be capitialized.

Use the article "an" only for words starting with a vowel or vowel-sound, like: "an hour", "an eagle", and "an idea". The letter "h" in "hour" is silent, so we can use "an".

When the digit is less than 10, we often spell out the number, rather than use the numberal: one, two, three...and so on.