Tenses / Talking about experience

I ________ (not work) with this technology before but I am a fast learner.

At my previous project I______ (use) CC++ and Python.

We _______ (work) with this stack of technologies for many years, I believe it's time to change something.

I __________(participate) in many different projects in my career.

At my previous work I_____ (not have) a chance to go up career ladder.

I _______(work) with that tool for 2 months when I got an interesting idea.

I ____________(complete) 3 long term software projects during this period of time.

I _________(work) in project management for 10 years and I have solid hands-on experience.

While I _______(work) at this project I gained a lot of experience and learned a lot.