Letters / Employee recommendation letter (chemical engineering and biotechnology) [3]

I would take out "the" when you mention how long you have known the employee...Instead of saying I have known...since "the" April 2009, you should say "I have known...since April 2009, when he...

You should say "As his employer for two years, I can confirm his joining to R&D Group of...company. He has made a creative, distinctive leap in mobility...

His researches, instead of his good researches.

He also performs well as a team leader when required, and also works effectively as a team member

Essays / (how technology will impact their businesses) writing a dynamic introduction [4]

Thank you so much...However, I am not following you on point #1, can you elaborate a little more? What do you mean by step by step small businesses become limited? Limited how?

Also you mention that technology can help a small business, how?