Senior Full-Stack Engineer
Nikita Beznosikov
I build end-to-end web products — checkout flows, payment integrations, internal admin tools, and
e-commerce systems. 9+ years of React, Next.js, Node.js, and TypeScript.
For 6 years I was the primary engineer owning a US-based DTC e-commerce stack — 50+ live offers with
A/B variations, a React checkout SPA, Node.js backend, and internal admin tooling — that reached
~$1M/month revenue and ~2,000 orders/day.
Madrid, Spain
Remote EU · B2B / EOR
Open to relocation
E-commerce
Checkout
Internal tooling
Shopify apps
Payments
React
Next.js
Node.js
TypeScript
01 · Selected work
Selected work
Production work and public demos across checkout, payments, Shopify apps, analytics, and internal
tools.
Manna — Custom DTC E-commerce Platform
Production work
DTC commerce
Checkout
Custom DTC storefront built from scratch after Shopify proved too limited for the company's
checkout, upsell, subscription, and A/B testing requirements.
Built
- Next.js storefront
- Node.js backend
- Custom checkout flow
- Sticky.io subscription billing integration
- CMS / admin panel for products, banners, and content
- Customer portal with Firebase Auth (login, registration, order history)
- Payment and order-management flows
- Server-side conversion tracking
Stack
Next.jsNode.jsSticky.ioFirebase AuthCheckoutPaymentsCMS
CreditReel — Pay-per-use Video Testimonials SaaS
SaaS product
Stripe billing
Video
SaaS platform for collecting text and video testimonials through shareable links, without
subscriptions.
Built
- Video recording flow
- Text and video review collection
- Stripe credit-based payments
- Business dashboard
- Embeddable testimonial widgets
- Cloudflare Stream video delivery
Stack
Next.jsSupabase / PostgreSQLStripeCloudflare StreamSaaS
PassportPro — Shopify Digital Product Passport App
Shopify app
EU compliance
QR passports
Shopify app for EU Digital Product Passport / GPSR workflows.
Built
- QR-based product passports
- Merchant admin interface
- CSV bulk editing
- AI-assisted autofill
- Shopify product-page integration
- Configurable passport data model
Stack
ShopifyRemixNode.jsPrismaShopify GraphQL APIQR PassportsAI Autofill
GMC Store Readiness Scanner — Shopify Audit Tool
Public Shopify app
Compliance tooling
Shopify app that audits stores for Google Merchant Center readiness before merchants submit
products for review.
Built
- Automated store-readiness checks
- Product data validation
- Policy and checkout checks
- Readiness score
- Prioritized issue list for merchants
- Shopify admin workflow
Stack
ShopifyRemixPostgreSQLShopify APIMerchant CenterAuditing
Technical demos
AI-assisted demos I built to explore patterns relevant to my work. I can walk through what they do
and why the pattern matters, but I won't pretend every implementation decision was mine.
Analytics Dashboard Demo
50k synthetic orders, downsampled time-series charting, virtualized server-side filtered
table, KPIs with period-over-period deltas.
Next.js · React · TanStack · Recharts
AI Feature Demo
Review analyser: bounded LLM call returning Zod-validated structured sentiment, with
Cloudflare Turnstile protecting the cost surface.
Next.js · Gemini · Zod · Turnstile
Payment System Demo
Payment orchestration patterns — multi-provider routing, retry logic, order state transitions,
and SSE event streaming. Built with AI assistance; I can walk through what it does and why the
patterns matter.
Node.js · TypeScript · Express · PostgreSQL · SSE
Side product
AI Flashcard App — iOS Learning App
iOS app
React Native
LLM
React Native iOS app that generates flashcard decks from user prompts using LLMs.
Built
- Prompt-based deck generation
- Spaced repetition
- Offline-first SQLite storage
- Freemium app flow
- App Store release
Stack
React NativeTypeScriptSQLiteLLMiOS
02 · Career
Experience
2020 — Present
Remote (US)
Launchify Ventures
Senior Full-Stack Engineer — E-commerce Stack
Primary engineer owning the full e-commerce stack for a US-based DTC business reaching
~$1M/month revenue and ~2,000 orders/day, with 80–90% mobile traffic.
Project 1 — DTC platform rebuild
Replaced a legacy monolith with a modular stack:
-
50+ live offers (blog, interstitial, and supporting pages each), 3–5 A/B variations running in
parallel
- A shared React checkout SPA across all offers
- Node.js + MongoDB backend for orders, billing, fraud, and admin
- JWT-based auth for all internal tools — login, role-based access, password reset flows
-
React admin panel so product, marketing, and ops could configure offers, checkout flows, A/B
tests, and integrations themselves — offer-launch time dropped from ~2 weeks to ~2 days
- Stripe, Braintree, PayPal, Apple Pay, and Google Pay integrated through Sticky.io
-
Rule-based fraud and carding protection (IP blocking, URL parameter checks) plus Visa CDRN for
chargeback automation
- Retry job that reprocessed unfinished orders — recovered ~10–20% of failed transactions
- Server-side tracking pipelines for Facebook CAPI, Google Ads, GTM, and BigQuery
- Migrated video delivery from AWS S3 to Cloudflare Stream — that infra cost dropped ~99%
Project 2 — Manna.com
Separate DTC store built from scratch — Next.js with its own React/MUI admin panel and Node.js
backend. Customer portal with Firebase Auth. Same payment integrations and tracking as Project
1, separate codebase.
2019 — 2020
Sinlao Media
Frontend Engineer
Built an internal analytics tool for media buyers to track Facebook ad performance and sales.
Tables, charts, and reporting views using React, Redux, Chart.js, and D3.js. Backend handled by
another engineer.
2016 — 2019
IQ Option
Frontend Engineer
Built frontend for an internal monitoring dashboard at a fintech company, working within a team.
React, Redux, charts and data tables. Used WebSockets to stream live data into the UI.
2015 — 2016
Greenlabs
Frontend Developer
Built cross-browser client web applications with HTML, CSS, and JavaScript.
03 · Toolkit
Stack
Frontend
React · Next.js · TypeScript · JavaScript · React Native
Backend
Node.js · Express · REST APIs · Webhooks · Zod
Databases
MongoDB · PostgreSQL · Supabase · Prisma
Payments
Stripe · Braintree · PayPal · Apple Pay · Google Pay · Sticky.io · Visa CDRN
E-commerce / Shopify
Shopify Apps · Remix · Shopify GraphQL API · Checkout · Subscriptions · Upsells
Analytics / Growth
BigQuery · Facebook CAPI · Google Ads · GTM · A/B Testing · Attribution
Infrastructure
Cloudflare Workers · Cloudflare Stream · AWS · DigitalOcean · Vercel · Railway
Testing
Playwright · Cypress · Jest
04 · Background
Education
2011 — 2014
B.Sc. Computer Science
K.G. Razumovsky Moscow State University
Certificate
IBM Cybersecurity Analyst Certificate