Senior Full-Stack Engineer · AI Native
Nikita Beznosikov
Senior Full-Stack Engineer with 9 years building web products end to end — checkout
flows, payment integrations, admin tooling, and full e-commerce systems. Strongest in React,
Next.js, Node.js, and TypeScript.
I owned the engineering for a US-based e-commerce business reaching ~$1M/month and
~2,000 orders/day — React checkout SPA, Node.js services, admin tooling, and 50+
live offers running 3–5 A/B variations in parallel.
Currently shipping independent web, App Store, and Shopify App Store products. I
work best with real ownership — picking the approach, building both ends, integrating services, and
supporting what I ship.
AI-native workflow with Cursor, Claude, and GitHub Copilot — parallel agent
sessions across branches for independent workstreams.
Madrid, Spain
Open to relocation · DE · NL · UK
E-commerce
Checkout
Internal tooling
Shopify apps
Payments
React
Next.js
Node.js
TypeScript
01 · Selected work
Selected work
Independent web, App Store, and Shopify App Store products, plus production work and technical demos
across checkout, payments, analytics, and internal tools.
Kairos — AI Job Search Workspace
AI product
Job search
Pipeline tracking
AI workspace built during my own search: paste a job posting and get a fit score against your
CV, skills, salary, and work-auth constraints.
Built
- Job-posting fit score against CV, skills, salary, and work-auth constraints
- Cover letter, recruiter Q&A, and cold outreach generation
- Critic pass to strip out chatbot tells
- Application pipeline tracking in one workspace
- AI-native workflow built around a real job search
Stack
Next.jsSupabasePrismaGemini FlashRailwayTypeScript
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
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
InstaDeck — iOS AI Flashcard App
iOS app
React Native
LLM
React Native iOS app that generates flashcard decks from any topic using LLMs, graded easy to
hard.
Built
- Prompt-based deck generation
- Spaced repetition
- Offline-first SQLite storage
- Freemium app flow
- App Store release
Stack
React NativeTypeScriptSQLiteLLMiOS
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
Manna — Custom E-commerce Platform
Production work
E-commerce
Checkout
Custom 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
- 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.jsFirebase AuthCheckoutPaymentsCMS
Technical demos
Demos I built to explore patterns relevant to my work.
Payment System Demo
Payment orchestration patterns — multi-provider routing, retry logic, order state transitions,
and SSE event streaming.
Node.js · TypeScript · Express · PostgreSQL · SSE
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
02 · Career
Experience
2025 — Present
Remote
Independent Engineer
Shipping independent products end to end
Designing, building, shipping, and supporting my own web, App Store, and Shopify App Store
products — both ends of the stack, all integrations, all the way to live customers.
-
Kairos
(getkairos.fyi,
GitHub) —
AI job search workspace: fit scoring against CV, skills, salary, and work-auth constraints,
cover letters, recruiter Q&A, cold outreach, critic pass, and application pipeline
tracking.
-
PassportPro
(passportpro.app) —
Shopify app for EU Digital Product Passport compliance: QR-coded passports, label printing,
product-page integration, AI auto-fill, CSV import.
-
CreditReel
(creditreel.to) —
pay-per-use video testimonial SaaS. Businesses share a link; clients record or write reviews.
Video on Cloudflare Stream, data on Supabase (PostgreSQL), landing page + admin panel.
-
InstaDeck
(App Store) — AI-generated flashcard decks from any topic, graded easy to hard. React Native +
TypeScript.
-
GMC Scanner
(Shopify App Store) — uses AI to evaluate store readiness score against Google Merchant Center requirements.
2022 — 2025
Remote
Launchify Ventures
Senior Full-Stack Engineer
US-based e-commerce reaching ~$1M/month and ~2,000 orders/day.
80–90% mobile traffic.
-
Designed and built the platform that replaced a legacy monolith — 50+ live offer funnels (blog
→ product → checkout → thank-you), each deployed independently with 3–5 A/B variations running
in parallel, so marketing could iterate without blocking on engineering.
-
Built a shared React checkout SPA across all offers, backed by a Node.js + MongoDB API
handling orders, billing, retry logic, and admin operations. JWT auth for internal users.
-
Built a React admin panel so product, marketing, and ops could configure offers, checkout
flows, A/B tests, payment providers, and tracking integrations themselves — offer-launch time
dropped from ~2 weeks to ~2 days.
-
Built-in analytics on both admin panels surfaced sales by offer, special-offer take rates,
decline rates, and funnel breakdowns — operators could spot a failing variant within hours
instead of waiting on reporting.
-
Integrated Stripe, Braintree, PayPal, Apple Pay, Google Pay. Multi-provider
routing, webhook handlers, retry logic for failed orders.
-
Built server-side tracking pipelines for Facebook CAPI, Google Ads, GTM, and BigQuery —
reliable event data without browser-side dependencies.
-
Manna.com
— built a separate vitamin store from scratch: Next.js app with its own React admin panel and
Firebase Auth customer portal. Customers could update orders, cancel, and downgrade
subscriptions through self-serve flows.
-
Rebuilt a legacy subscription video platform on Next.js and migrated video delivery from AWS
S3 to Cloudflare Stream — monthly infra cost dropped ~99% (~$800 → ~$5).
2020 — 2022
Remote
Launchify Ventures
Full-Stack Engineer
Joined as frontend on the legacy monolith. When the backend engineer left during COVID, learned
Node.js, took over the API, and proposed the rewrite that became the modular platform above —
shipped the first admin panel and offer mini-apps.
2019 — 2020
San Diego, CA
Sinlao Media
Frontend Engineer
Built an internal analytics dashboard for media buyers — Facebook ad performance and sales
reporting. React, Redux, Chart.js, D3.js.
2016 — 2019
St Petersburg
IQ Option
Frontend Engineer
Built an internal monitoring dashboard at an online-trading fintech. React, Redux, real-time
data over WebSockets, charts and data tables for ops teams.
03 · Toolkit
Stack
Frontend
React · Next.js · TypeScript · JavaScript
Backend
Node.js · Express · REST APIs · Webhooks · JWT · Firebase Auth · Zod
Database
MongoDB · Supabase (PostgreSQL, side projects)
Payments
Stripe · Braintree · PayPal · Apple Pay · Google Pay · Shopify
Analytics
Facebook CAPI · Google Ads · GTM · Google Analytics API · BigQuery
Infrastructure
AWS (EC2, S3, IAM) · DigitalOcean · Vercel · Railway · Cloudflare (Stream, Workers, DNS)
AI tools
Cursor · Claude · GitHub Copilot
Testing / Mobile
Playwright · Cypress · React Native (published iOS app)
04 · Background
Education
2010 — 2014
B.Sc. Computer Science
K.G. Razumovsky Moscow State University
Nov 2022
IBM Cybersecurity Analyst
Professional Certificate · Coursera