Experience: I would put this at the top. I would also remove the general stuff like "The work included: " I think that is implied. Also bullets like "Develop various features from idea to production." are pretty general and dont add a lot of information. Instead keep the bullet points specific. They will give you a lot more bang for your buck that way.
Skills: This looks good, put it after experience.
Education: Good, I would put this at the very bottom, last.
Additional Experience: This is pretty relevant I would put this under the experience rather than in a separate section.
Last but not least I would adjust your font size and spacing to get it to fit on one page which should be pretty easy to do since it is close.
Hi!
Hope that's helpful!!!
Thanks for the feedback :D