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Roman Kurnovskii - All Posts

Latest posts from the blog in all languages.

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[EN] Reinforcement Learning for Trading – A Hands-On Journey from Synthetic to Real Bitcoin

Step-by-step walkthrough of reinforcement learning for trading. Build a Q-learning agent in plain NumPy, verify it learns mean-reversion on synthetic data, then run the identical code on 20,000 real BTC/USDT 15-min bars from Bybit – and discover why

[EN] Anatomy of a High-Converting Landing Page in 2026

A technical reference and structural blueprint of the 12-section high-converting landing page anatomy. Explains how to align layout design with conversion psychology (Trust, Belief, Decision) and includes a reusable AI Agent skill to scaffold the template.

[EN] Trading Dynamics & Copy-Trading Feasibility on Pump.fun: A Quantitative Study of Solana Bonding Curves

An in-depth quantitative research paper exploring automated bot behaviors, constant-product bonding curve mechanics, and the practical feasibility of copy-trading on Solana

[RU] Как создать постоянные тестовые аккаунты для ревьюеров App Store с Supabase

Узнайте, как создать постоянные демо-аккаунты для ревьюеров App Store при использовании аутентификации Supabase с Magic Links или OTP. Используйте триггеры PostgreSQL для установки предсказуемых токенов аутентификации.

[EN] How to Create Permanent Test Accounts for App Store Reviewers with Supabase

Learn how to create permanent demo accounts for App Store reviewers when using Supabase authentication with Magic Links or OTP. Use PostgreSQL triggers to set predictable authentication tokens.

[RU] TestFlight - Публикация

Решение частых ошибок TestFlight, включая BETA_CONTRACT_MISSING, отсутствие описания бета-версии приложения и проблемы с доступностью приложения.

[EN] TestFlight Troubleshooting Guide

Troubleshoot common TestFlight errors including BETA_CONTRACT_MISSING, Beta App Description missing, and app availability issues.

[RU] В чём разница между Trie и Tree?

В чём разница между Trie и Tree?

[EN] Top Software Engineering Diagrams

Top Software Engineering Diagrams

[EN] Python <-> Dart Code Snippets Comparison

Python Dart Code Snippets Comparison

[EN] Python <-> Rust Code Snippets Comparison

Python Rust Code Snippets Comparison

[EN] Access Private GitHub Repositories on an EC2 Server

Step-by-step guide to accessing private GitHub repositories from an EC2 instance.

[RU] Ликвидность на примере Pump.fun

Ликвидность на примере Pump.fun и её расчёт по каждой операции

[RU] Market Cap на примере Pump.fun

Market Cap на примере Pump.fun по каждой операции

[EN] Solana SDK migration Guide (v1 → @solana/web3.js 2.x)

Solana SDK migration Guide (v1 → @solana/web3.js 2.x)

[EN] Set Up VPS on Debian

A step-by-step guide to setting up a secure Debian VPS by creating a new user, disabling root access, and enabling SSH key-based authentication.

[EN] Set Up VPS on Ubuntu

A step-by-step guide to setting up a secure Ubuntu VPS by creating a new user, disabling root access, and enabling SSH key-based authentication.

[RU] Пополнение Interactive Brokers с Израильского счета

Пополнение Interactive Brokers с Израильского счета банка Дисконт

[EN] Deposit Interactive Brokers from Israel Discount bank

Deposit Interactive Brokers from Israel Discount bank

[EN] Telegram bot with Google Apps Script (GAS)

Telegram bot with Google Apps Script (GAS)

[EN] Interactive vs. Non-Interactive Users in Linux

An in-depth comparison between interactive and non-interactive users in Linux.

[EN] Setup subdomains on VPS CentOS

Setup subdomains on VPS CentOS. Example with Docker image.

[EN] Linters & Formatters Setup for Python, Groovy, JavaScript in VSCode

Setting Up Python and Groovy Linters and Formatters in Visual Studio Code

[EN] Python docstring templates

TPython docstring templates

[EN] Difference between Tries and Trees?

Difference between Tries and Trees?

[EN] How to publish JavaScript package to npm registry

A detailed guide on how to create, structure, and publish a JavaScript package to the npm registry

[EN] How to upload an opensource application to SourceForge

Step-by-Step Guide how to upload and manage your open-source application on SourceForge with this detailed, step-by-step guide, ensuring maximum visibility and accessibility for your project.

[EN] How to publish typescript package to npm registry

How to publish typescript package to npm registry

[RU] Установка Ubuntu Desktop 22.10 (Kinetic Kudu) на ARM CPU

Быстрая базовая установка Ubuntu Desktop 22.10 на виртуальную машину UTM с процессором ARM M1

[RU] Установка Linux RHEL 9

Скачать и установить Linux RHEL 9 бесплатно

[EN] How to Download and Install Linux RHEL 9 for Free

How to Download and Install Linux RHEL 9 for Free

[RU] PyScript - Python, встроенный в HTML

PyScript - Python, встроенный в HTML