Nazarii Nalyvaiko
REF NN · 2026UKRAINE (REMOTE)
Nazarii Nalyvaiko
Open to Full-Stack roles

Nazarii Nalyvaiko

Full-Stack Developer — TypeScript · Next.js · NestJS · PostgreSQL · AI integrations

Full-stack developer running production e-commerce systems: a CRM platform, a custom Shopify checkout, and payment, logistics and storefront integrations — all live. BSc in Applied Mathematics (AI). I build products, not demos.

Get in Touch
VERIFIED · IN PRODUCTION
NNEST. 2026
Live Integrations Shipped5
Storefronts in Production2
Mathematical FoundationBSc Math
StatusIn Production
REF CAPABILITY · E-COMMERCEIN PRODUCTION SINCE 2024

E-commerce CRM & Integration Pipeline

How I wire storefronts, payments and logistics into one system

One order, four stations
Open a station to see what I build there

Front · where the order is takenShopify · Horoshop
  • Shopify storefronts built from scratch: theme, full product catalogue, on-page SEO.
  • Existing catalogues maintained through import/export pipelines.
  • Navigation and category structure.
Front · my code, not the platform'sNext.js
  • Checkout interface built in Next.js.
  • Payment provider wired in end to end.
  • Completed orders handed straight to the order backend.
Core · single source of truthNestJS · PostgreSQL
  • NestJS API over a PostgreSQL schema on Supabase.
  • Deployed on Vercel/Docker behind Nginx.
  • Automated CI/CD on every push.
Fan-out · everything reads the same orderRun in parallel
Payments

Monobank acquiring, driven from the order backend.

  • —Invoices and payment screens inside the checkout
  • —Webhook callbacks and automated refunds
Monobank API
Logistics

Shipping paperwork generated rather than typed.

  • —Express waybills (ТТН) from order data
  • —Shipping registries assembled automatically
Nova Poshta API
Alerts

Operators act on orders without watching a dashboard.

  • —Order events pushed in real time
  • —Delivered where the staff already work
Telegram Bot API
Attribution

Revenue reported from the checkout itself.

  • —Conversion events fired at purchase
  • —Sales attributed back to ad spend
GA4 · Google Ads
Shipped
vivo.barefootukraine.com
vivo.barefootukraine.com

Shopify storefront built from scratch — theme, full product catalogue, on-page SEO.

saguaro.com.ua
saguaro.com.ua

Horoshop storefront — catalogue import/export and navigation.

Production Timeline

Experience

Production e-commerce systems, running live today

SAGUARO & BAREFOOT UKRAINE2024 — PRESENT

Full-Stack Developer — E-commerce (CRM & Integrations)

  1. 01Built and operate a production order backend (NestJS, Next.js, PostgreSQL/Supabase) with CI/CD to Vercel — live and handling real orders daily.
  2. 02Built a custom checkout in place of the platform default, with payments wired end-to-end.
  3. 03Integrated Monobank acquiring: invoicing, payment screens, automated refunds.
  4. 04Automated Nova Poshta shipping: express waybills (ТТН) and registries generated instead of typed.
  5. 05Built a Shopify store from scratch (vivo.barefootukraine.com) — theme, full product catalogue and SEO.
  6. 06Maintain a Horoshop storefront (saguaro.com.ua): catalogue import/export and navigation.
  7. 07Telegram bots for order flow; GA4 and Google Ads tracking.
  8. 08Production ops: Docker, Nginx, Linux, deployments and domains.
Stack
TypeScriptNext.jsNestJSPostgreSQLSupabaseMonobank APINova Poshta APIShopifyDockerNginxVercel
Project Showcase

What I build outside client work

Open-source tools, MCP servers, and experiments

MCP Server

shopify-store-builder-mcp

MCP server that lets AI assistants create and manage Shopify stores end-to-end via the Admin GraphQL API. Demo videos in the repo.

TypeScriptShopify Admin GraphQL APIMCP
In Progress

store-watchdog

24/7 Shopify store monitoring with instant audits — catches issues before customers do.

TypeScriptShopify APIMonitoring
Computer Vision

Motion-to-Action Recognition

Real-time computer vision that reads human movement from a camera feed and triggers mapped actions.

PythonOpenCVComputer Vision
Core Competencies

Skills

Full ATS-readable stack — engineering, integrations, and applied math

01

Engineering

14
TypeScriptJavaScriptNext.jsReactNestJSPostgreSQLSupabaseREST & GraphQL APIsDockerNginxLinuxCI/CDVercelGit
02

Integrations

5
Shopify Admin APIHoroshopMonobank APINova Poshta APITelegram Bot API
03

AI / ML

6
PythonOpenCVComputer VisionAI-Assisted DevelopmentGemini APIPrompt Engineering
04

Applied Math

3
Linear AlgebraProbability & StatisticsNumerical Methods
Academic Qualification

Education

Faculty of Mathematics and Digital Technologies

UZHHOROD NATIONAL UNIVERSITYGRADUATED · 2026
Uzhhorod National University

BSc, Applied Mathematics (AI)

Faculty of Mathematics and Digital Technologies

Coursework in probability theory, mathematical statistics, linear algebra, and numerical methods — the theoretical foundation behind the ML work.

Coursework
Linear AlgebraProbability TheoryNumerical MethodsDifferential Equations
LANGUAGES2

Languages

UkrainianNative
EnglishB1+, daily practice

Technical docs and API specifications read and written in English daily.