Writing
Notes on engineering, Rails, AI-assisted development, and the systems I build.
A measurement-driven Rails RSpec case study: runtime-balanced workers, safe fixture reduction, PostgreSQL template databases, and CI guardrails cut a growing Bitbucket pipeline to under four...
A practical engineering take on the AI Engineer talk 'Mergeable by default: Building the context engine to save time and tokens' — why useful AI...
How one principal backend engineer shipped 400+ PRs, built a zero-drift AI operating system, got a new engineer onto two top-priority tasks in 15 minutes,...
A comprehensive guide to building an enterprise-grade database seeding system in Rails—from a 3,600-line monolith to a modular architecture supporting 100k+ full candidate avatars with...
A practical upgrade to the Zero-Gap framework: how we reduced AI rule drift using a single entry-point prompt, Hard-Fail rules, evidence-based audits, negative examples, and...
A senior-engineer playbook for agentic development: the mental model, the tooling vocabulary (AGENTS.md, Skills, MCP, RAG, LSP, Hooks), and a practical repo setup that increases...
How we built a Playwright + GPT-5.1 pipeline that logs into neverlands.ru, captures real game screens, and turns them into structured design insights for your...
A comprehensive guide to integrating 11 dry-rb gems into your Ruby on Rails API—showing real before/after examples of how dry-types, dry-struct, dry-monads, dry-validation, dry-container, dry-matcher,...
A comprehensive guide to migrating your Rails application from MySQL to PostgreSQL—covering database-agnostic code patterns, the migration process, PostgreSQL's advanced features, and multi-schema architecture strategies....
A complete framework for shipping regression-free Rails APIs with AI assistants—combining contract-first development, systematic verification, and gap-free documentation.
A comprehensive guide to building a turn-based browser MMORPG using Ruby on Rails, Hotwire, and AI-assisted development. Learn how documentation-driven workflows, feature decomposition, and "inspired-by"...
Step-by-step guide to building reliable, authenticated, and scalable WebSockets in Rails using ActionCable and JWT, with practical code examples and architecture patterns.
A practical control loop (with code) for turning Codex-style assistants into force multipliers—and why experience is non-negotiable.
How we merged Rails, RSpec, and Ruby rules into a single, enforceable guide—and how to attach it to Cursor prompts for consistent, efficient results.
Zero-setup onboarding, reproducible environments, and fewer 'works on my machine' moments.
ACID in Rails PostgreSQL vs MongoDB with Atomic Patterns
A tiny Rails console banner that show app stats every time you run rails c
Optimizing a Complex Rails Avatar Endpoint
A battle-tested, copy‑paste `/up` endpoint for Rails API apps—no autoloading traps, no brittle config. One initializer, ENV‑driven settings, optional DB/Redis checks, clear status semantics, and...
If your test suite ever fails “only sometimes,” there’s a good chance time is involved. Rails ships with the excellent ActiveSupport::Testing::TimeHelpers, giving you tools like...
If you’re comfortable writing Rails apps but want to really understand what’s going on under the hood—and use that knowledge to make better technical decisions—this...
Practical, copy-paste-ready patterns for ActiveSupport::Notifications and ActiveSupport::LogSubscriber in Rails 8+.
A practical, production-grade guide to ActiveSupport::LogSubscriber for Rails 8+: structured JSON logs, log tags, and per-tenant log routing.
Step-by-step guide to securing your Ruby on Rails API authentication using Devise, Devise-JWT, Doorkeeper-JWT, and RSA encryption keys.
A step‑by‑step log of the dead‑ends and the final, tidy setup— complete with code snippets, failure‑app JSON errors, and cURL recipes.
In 2014, I decided to move to Kyiv, Ukraine. I had a great opportunity to work on an interesting project that integrated with the UK...
Applications always change. This post collects practical principles and Rails‑friendly patterns I use to keep code maintainable over the long run—leaning on Ruby on Rails...