Konstantin Nikolaienko's Work | ContraWork by Konstantin Nikolaienko
Konstantin Nikolaienko

Konstantin Nikolaienko

AI & Full Stack Developer | Next.js, SaaS, Stripe, Automatio

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Followed by Milan G and GALLERY L

Rivne, Ukraine

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Rivne, Ukraine

Cover image for Currently building Cryptonix — an
Currently building Cryptonix — an AI-powered crypto intelligence platform focused on trading signals, automation, and real-time analytics. Built with Next.js, Stripe integrations, crypto payments, and modern SaaS architecture.
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Cover image for Integrated a crypto payment flow
Integrated a crypto payment flow using USDT (TRC20) for subscription-based SaaS access inside Cryptonix. The system includes: • QR wallet payments • Crypto subscription handling • TRC20 network validation • Secure payment instructions • Responsive mobile payment UI • User-friendly onboarding flow Focused on simplicity, speed, and accessibility for crypto-native users.
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Cover image for SaaS Authentication & Subscription System
SaaS Authentication & Subscription System
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Cover image for Built a modern SaaS dashboard
Built a modern SaaS dashboard with authentication, payment integration, and responsive frontend architecture. The project includes: • Secure authentication flow • Stripe payment integration • Responsive dashboard UI • SaaS subscription structure • Modern Next.js frontend • Real-time data handling Focused on performance, scalability, clean UX, and production-ready architecture.
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