Oleksii Vasyliev aka leopard

I am a Software Architect, Full-Stack Engineer and Podcaster.

2026

2026-05-16 QPDF WASM for client-side PDFs and TreRegex for fuzzy matching in Ruby and Node.js
2026-04-14 Re2js v2.2.0: linear-time lookbehinds, RE2Set, and a pure JS architecture

2016

2016-09-20 Safe and unsafe operations for high volume PostgreSQL
2016-09-07 What is Accelerated Mobile Pages (AMP) and how you can use it

2015

2015-10-13 Improving security of your web applications with the Content Security Policy
2015-04-13 PostgreSQL Indexes
2015-01-05 SQL Joins Visualizer - build SQL JOIN between two tables by using of Venn diagrams

2014

2014-10-29 Zopfli-ffi - Ruby wrapper for zopfli library
2014-10-11 Pagination Done the PostgreSQL Way
2014-08-25 Working with PostgreSQL: tuning and scaling (4-th edition, russian) and Cooking Infrastructure by Chef (1-st edition)
2014-05-26 Cooking Infrastructure by Chef: Free open source book about Chef
2014-03-24 PgTune - Tuning PostgreSQL config by your hardware

2013

2013-12-01 Chef cookbooks development by TDD
2013-11-23 Speed up your Ruby on Rails application using WebP images
2013-11-08 World of the NoSQL databases
2013-11-01 How I update project from Rails 3 to Rails 4
2013-10-13 Binary serialization formats
2013-10-12 Speed up testing of ruby projects on Travis-CI
2013-09-28 Multicorn - powerful foreign data wrapper for PostgreSQL
2013-09-19 Check your build status in Travis CI by Sphero
2013-09-05 Setting up shared memory for PostgreSQL
2013-09-02 Using ltree for hierarchical structures in PostgreSQL
2013-09-01 Getting Started with Chef Server. Part 2
2013-07-11 Storing the tree structures in the RDBMS
2013-03-25 Getting Started with Chef Server. Bonus updates
2013-02-17 Getting Started with Chef Server. Part 1
2013-01-26 Getting Started with Chef Solo. Part 5
2013-01-12 Getting Started with Chef Solo. Part 4
2013-01-07 Getting Started with Chef Solo. Part 3
2013-01-05 Getting Started with Chef Solo. Part 2
2013-01-04 Getting Started with Chef Solo. Part 1

2012

2012-12-08 MongodbLogger 0.4.0 for Rails 3. What's new?
2012-11-14 Работа с PostgreSQL: настройка и масштабирование. 3-е издание
2012-10-21 Smartme master class and PyCon conference my materials
2012-08-16 Разработка веб-приложений с использованием CoffeeScript и Backbone.js (мастер-класс)
2012-07-08 Using CORS with Rails
2012-06-14 How to migrate from Wordpress blog to Jekyll
2012-06-01 Effective similarity search in PostgreSQL