Dmitry Tsepelev

Hi! 👋

My name is Dmitry and I'm a backend engineer focusing on Ruby, Rails, PostgreSQL and GraphQL. I prefer working on arhitectural, performance and developer experience (i.e., custom linters, CI actions, etc.) tasks. At my free time I'm playing with Go, Rust and Haskell.

I contribute to various open–source projects (Ruby on Rails, graphql-ruby, GitLab, prism and many more). Also, I maintain my own libraries — check them I contribute to various open–source projects (Ruby on Rails, graphql-ruby, GitLab, prism and many more). Also, I maintain my own libraries — check them here.

Featured articles and conference talks:

📕Why Ruby has Symbols;

🗣️ Building high–performance GraphQL APIs;

📗 Understading why attr_accessor in Ruby is faster than a regular method;

📙 Service objects in Rails: how to find a mess;

🎤 Ruby Rogues Podcast 473;

📚 GraphQL on Rails tutorial: Part 1, Part 2 and Part 3;

📘 How to GraphQL with Ruby, Rails, Active Record, and no N+1;📔One row, many threads: How to avoid database duplicates in Rails applications.

You can find me on Twitter and LinkedIn.