For an example my Codeforces account is vu.tunganh96, but I often practice on other accounts as well.
I competed in Google's HashCode 2018 and placed 725th out of 4856 teams. It was my first optimalization problem competition, so I'm quite pleased with the result.
I finished at the 8th place (silver medal) at CTU Open 2017.
I attended CERC 2017 with poor results. Hopefully I will improve by next year :).