Hello, I'm Andrii.
Senior full-stack ownership for critical workflows, careful modernization, and production AI—across React, Next.js, TypeScript, and Ruby on Rails.
About
I help product teams turn complex, high-risk work into clear releases. The useful part is not another layer of consulting—it is direct ownership from the interface to production.
How I work
Complex delivery gets easier when product decisions and technical decisions stay in the same conversation. I keep the scope visible, ship in reviewable slices, and close the production details that make software dependable.
Explore servicesYears building fintech, SaaS, Web3, and developer-facing products.
Delivery focus
Selected work
A live fintech platform and two public products show how decisions move through product UX, application logic, data, testing, and release.
Wallet-first fintech
Live product · 2026
Self-custody activity, turned into a portfolio you can act on.
A live crypto portfolio product for importing wallet history, reviewing holdings and transactions, exploring analytics, and preparing tax-ready exports.
Local-first finance
Open source · v1.0
Private financial data, turned into a usable local workspace.
Monobank sync, review, reports, budgets, backups, and deterministic exports—shipped as a local TypeScript product.
AI product workflow
Open source · v0.1.2
An AI task board that keeps approval in the loop.
Messy notes become structured tasks through agent proposals, explicit human approval, and durable local history.
Trusted in public
Focused fixes across AI infrastructure, Rails, Ruby core, RubyGems, and ruby-lang.org.
Security boundaries, webhook integrity, Slack routing, and agent safeguards.
Action Mailbox hardening, host validation, SQLite, and framework edge cases.
Ruby core, RubyGems, and Ukrainian localization for the official Ruby website.
Services
Bring me in where product UX, application logic, integrations, and production risk meet. The engagement stays focused around a concrete outcome.
Discuss the projectA focused workflow carried from product framing and interface design through APIs, data, testing, and release.
Reduce production risk and improve a fragile application in reviewable slices while the team keeps shipping.
Turn a convincing prototype into a dependable product with tools, approvals, evaluations, fallbacks, and observability.
Join an existing team to unblock a high-risk scope, strengthen the implementation, and leave a maintainable path forward.
Process
Enough structure to keep risk visible, without a heavyweight consulting process.
Clear scope · visible progress · production finish
Clarify the decision, constraints, and smallest useful release before implementation expands the scope.
Deliver working increments with direct written updates, tradeoffs, and the next decision clearly stated.
Close gaps in failure states, performance, tests, observability, accessibility, and production behavior.
Document what matters, transfer context, and make the next release easier than the first.
Writing
AI systems, Rails, architecture, and product delivery—written from implementation.
Your GitHub profile is more than a code repository—it's your professional portfolio. Learn how to leverage GitHub's features to build a personal brand that attracts opportunities.
Read articleOpenClaw is an open-source agent runtime that connects LLMs to tools, files, and channels. Here is what it enables and where it fits.
Read articleA practical architecture guide for production AI agents: tool calling, memory, evaluation, tracing, and guardrails for reliable automation.
Read articleCommon questions
The practical details, without another wall of copy.
A focused product thread from interface and application logic through APIs, integrations, testing, and production release.
Yes. I work directly with product, design, and engineering teams, taking responsibility for a clear scope without forcing a rewrite.
Share the product, current constraint, and timing. We will identify the smallest useful scope and a clear delivery path.
Have a project in mind?
Share the product, current constraint, and timing. You'll get a direct answer on fit, risk, and the smallest sensible move.
