Oleksii Berliziev, Fractional CTO and Tech Lead
  • AI
  • TypeScript
  • React Native
  • React
  • Node.js
  • Next.js
  • NestJS
  • GraphQL
  • AWS
  • System design

Oleksii
Berliziev, Fractional CTO and Tech Lead for Founders

Fractional CTO for founders shipping production-grade software.

Your idea deserves more than a prototype. Your prototype deserves a real foundation.

Apps in production
Omega European MastersGolfcransB-SharpePinCleanYamback
StatusAvailable

About Me

If you've shipped something real with Cursor or Claude Code and now need someone to take it further, that's the work I'm built for. If you've got a working prototype and a clear picture of where it should go, I've been shipping that for years. Both are good places to start.

I've spent the last 10+ years building things end-to-end: mobile, backend, frontend, infrastructure. The last three on a live event platform used by thousands of people during international tournaments. Cursor, Claude Code, and Copilot are part of my daily workflow, which is why I know where they stop being enough. I don't hand off when my "part" is done. I care about the whole system working, and about keeping it simple enough that someone can pick it up and maintain it when that person is no longer me.

The stack matters less to me than the quality of the product. I want to understand it, the users, and the direction, not just the ticket on my plate. Most engagements I start become long-term because I stay invested in what I build. If you're looking for a technical partner for the arc of a business rather than a vendor for the next quarter, that's where I'm at my best.

Location
Kyiv, Ukraine
Experience
10+ Years
Education
CS, NTUU "KPI"
Focus
Full-Stack

Projects

Live products I've built from scratch or rescued, at agency scale and solo. Pick one that looks like yours, then let's talk.

Sports·Tech Lead·2022–2026

Golf Tournament Platform

A platform the founders' team runs themselves. They publish pages, toggle whole mobile-app sections and scan tickets on-site during live rounds. No developer in the loop after launch.

  • Four years live, three tournament editions
  • Thousands of concurrent users on tournament days
  • On-site ticket scanning during live rounds
  • Held the whole platform alone in the final year
Live-event scale · Self-serve CMS for non-devs
TYPESCRIPTREACTREACT NATIVENEXT.JSNESTJSGRAPHQLNODE.JS
Social·Developer·2025–2026

Golf Social Network

A mature, live product where booking and search had to ship across web and mobile while legacy modules were rewritten underneath, with no feature-freeze and no user-visible regressions.

  • Legacy rebuilt with zero user-visible regressions
  • Brand-new booking and search flows shipped on a live codebase
  • No feature-freeze during the legacy rewrite
Mature codebase · Ships without breaking
TYPESCRIPTREACTNEXT.JSREACT NATIVEGRAPHQLNODE.JS
Sports·Mobile Lead·2022–2026

Golf Club Booking App

A native iOS and Android booking app for the club, owned end-to-end as mobile lead from architecture to real-world solution.

  • Mobile lead from first commit to both stores
  • Saferpay payments shipping on iOS + Android
  • Booking with promocode system, step restore and lock system
Mobile + payments · Lead ownership
TYPESCRIPTREACT NATIVE
Fintech·Mobile Lead·2020–2022

Currency Exchange App

A Swiss fintech mobile client where everything had to ship production-grade: a complex multi-step regulated signup (Onfido KYC), four-language localization and signed iOS/Android release pipelines.

  • Application launched in a regulated Swiss market
  • Complex multi-step Onfido KYC signup with nested sub-flows
  • Mobile observability and attribution: Crashlytics, Firebase Analytics, AppsFlyer
Swiss fintech · KYC + regulatory-grade mobile
TYPESCRIPTREACT NATIVE
Private BuildMore details available on request
Services·Full-Stack Lead·2018–2020

On-Demand Car Wash

An on-demand service platform built solo from zero. Customer mobile app, dispatcher web dashboard, backend and infra. Shipped, productised and re-launched in a second market.

  • Solo build of mobile + dispatcher web + backend + infra
  • Live in the original market 2018–2020
  • Productised and re-launched in South Africa
Solo full-stack build · Service app from zero, two markets
TYPESCRIPTREACTREACT NATIVEGRAPHQLNODE.JSAWS

Skills

What people say

Andrii Grygorenko

Andrii Grygorenko

Senior Project manager · Allsquare Golf

TLDR: Oleksii owns and delivers. Under pressure, at scale, and in the unknown. Vast experience in Mobile, Web, and Backend within FinTech & SaaS.

I've worked with Oleksii for eight years across multiple products and industries, where

Ways to work together

Ship fast

For founders shipping the first real version, fast

MVP & Fast Builds

This website was built from scratch in weeks using AI-assisted development.

That's the pace I bring to your project. Scope and price agreed up front. Live in weeks. One person designing, building, and shipping the whole thing: mobile, web, backend, infrastructure.

What ships is real software on real infrastructure, not a clickable mockup. If the idea works, you have a solid, stable foundation built by an experienced engineer, not a demo you'll throw away. If it doesn't, you found out in weeks, not a year.

Best for

Founders who need to ship the first real version of their product fast, without committing to a full build before they've seen it work.

Start a fast build

Fast scope. Fixed price. Shipped in weeks.

Prototype → Product

For vibe-coded MVPs that outgrew themselves

Vibe-code Rescue

You built an MVP with Cursor, Claude Code, or ChatGPT and it proved the idea. But the prototype that gets you to traction isn't the product that scales with you. The codebase gets tangled, features start interfering with each other, and the AI that built it fast can't reason about it anymore. I use the same tools every day, so I know exactly where they run out of road. I keep what works, rebuild what can't, and put real architecture underneath what you've already shipped.

Best for

Founders whose AI-built MVP validated the idea and now needs real engineering underneath it. Before every new feature becomes a risk.

Audit my codebase

Keep what works. Rebuild what can't. No rewrite.

Not sure which fits? Start with a discovery call, and we'll figure it out together.

Book a call

Who I work with

I do my best work with founders who have a clear picture of the product they want, and want a technical partner to figure out how to build it.

Good fit

What I do best

You shipped an MVP with Cursor, Claude Code, or ChatGPT, and it's starting to buckle. I use the same tools every day. I know exactly where they give up, and what to rebuild underneath.

  • You need to ship the first real version of your product in weeks, not over six months with an agency.
  • You want one person owning your product end to end: mobile, web, backend, and infrastructure.
  • You're non-technical. You want a partner who makes calls you can trust, not a vendor waiting for instructions.
  • You're done bolting features onto a shaky base. You want real architecture underneath, ready for whatever you build next.

Better served elsewhere

  • I'm at my best as a technical partner who challenges decisions, not as execution-only hands.
  • I'm deep in the TypeScript/Node world. If your backend is Python, Ruby, Java, or .NET, you'd want someone who lives in that stack.
  • You think "I did it in five minutes, so you should do it in three." I use the same AI you do. It makes the typing fast, not the deciding.

Not sure which you are? That's what the discovery call is for.

Frequently asked

BUILDING NEW

You're building something new

RESCUING AN MVP

You built it with AI

Contact

Bring me your prototype. I'll tell you what to keep, what to rebuild, what to ship next.

Whether you've got a prototype that's working, need a technical partner, or just want to say hi, my inbox is always open.

StatusAvailable

Prefer a call?

30 min · via Calendly

Book a discovery call