Hi, my name is Bilegdemberel Sumiyabayar. My linkedin is blgdmbrl. I enjoy solving problems, and I call myself YEP, which is a Mongolian word meaning “flood”. You may have heard the word before. I love movies, music and playing tetris. One of my all-time favorite movies is Maborosi directed by Hirokazu Koreeda, and my all-time favorite album is Among My Swan by Mazzy Star.

You can find my Jstris profile at blgdmbrl. Currently, my all-time best 40 line score is 32.892 seconds.


Job experience

I have experience working with a variety of databases such as Postgre, MySQL, Oracle, Cassandra, Redis, Neo4j, and ScyllaDB, and I am proficient in programming languages including Golang, C, C++, Python, and Nodejs. Additionally, I have worked with front-end frameworks such as Reactjs, React native, and Nextjs, and have experience in blockchain development using Solidity, hardhat, go-eth and Ethereum.

  • Full stack developer at Cyan (2023 - )
  • Chief Technology Officer (CTO) at Bit Chaos (2022 - 2023)
  • Database Administrator at Golomt Bank (2021 - 2022)
  • Software Engineer at Gerege Systems (2018 - 2021)
  • Software Programming Instructor at Nest Academy (2019 - 2020)


  • Bachelor’s degree in Computer Science from the National University of Mongolia. (2017-2021)

Awards and Honors

  • First Place, National Programming Contest 2019
  • Bronze Medalist, The ACM-ICPC Asia Beijing Regional Contest 2018
  • First Place, ACM-ICPC Mongolia 2017
  • Participant, International Olympiad in Informatics (IOI) 2017
  • Second Place, Mongolian National Olympiad in Informatics 2017


  • Edge prediction - Relational Graph Neural Network