Being a problem setter is one of the most enjoyable things to me personally. Watching tens of thousands of people attempt your problem, spend significant time thinking about the solution, before finally getting the critical idea and solving it - that rush is irreplaceable.
1) I was a co-setter of Codeforces Round #646; my problem was problem C. I also had a lot of fun writing the editorial for the contest (I included memes for every problem!). I believe this is one of the most upvoted rounds in Codeforces history :)
2) I wrote a problem for IOITC, which featured in TSTs Day 3 (the Indian selection tests for the Informatics Olympiad team). You can find a pdf version here.
(Fun fact: Originally, I set it with the larger constraint of k = 1e9, but due to IOI syllabus restrictions this version could not appear.)
3) I have had multiple problems feature in HackerEarth in the previous year: they can be found here: problem1, problem2, problem3.
4) I set a problem for the Codechef January Lunchtime - view it here
I have more problems upcoming soon in various rounds, so stay tuned!
(Image from https://towardsdatascience.com/defining-a-data-science-problem-28c21d817c0b)