Hello Karim,
Though I'm a relatively new freelancer and have nothing to show for myself, I'm sure I won't disappoint and work to meet the project goals.
I've experience in MEAN, I tried several Topcoder competitions before coming here to freelance. I've not won and I still compete. But I've a fair idea how to build production quality code. So I can learn Koa very quickly and deliver. I'm also familiar with Heroku.
Please just be clear with your requirements and make a fair assessment and be prompt with the payments.
I've a weekly target of INR 10,000 or CLP 100,000 for 10 hr per week work. For INR 15,000 or CLP 150,000 I'll work 20 hr per week.
Hope to have a healthy work relationship with you.
Warm regards,
Murugan.