Oleh Khrystenko

@oleh_khrystenko

Full Stack SaaS MVP Developer, Nextjs NestJS Stripe and AI integration

Ukraine
English, Ukrainian
About me
Paying users in 4 weeks. Not a prototype that collects dust. A product that collects money. You describe the idea. I scope, price, and ship. Auth, payments, AI, dashboards, everything real users expect from a service they pay for. Fixed price. Source code yours. Architecture your future team maintains without rewrites. Live demo available.... Read more

Skills

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oleh_khrystenko
Oleh Khrystenko
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See my services

Full Stack Web Applications
I will develop and launch your saas mvp with nextjs and stripe
From$750 / projectMore details
API & Integrations
I will integrate stripe payments and webhooks for your saas
From$150 / projectMore details

Portfolio

Work experience

Upwork

CyanShip - Founder & Full Stack Engineer

Upwork • Self-employed

Mar 2026 - Present • 2 mos

CyanShip is a production-ready B2B SaaS platform designed to help founders launch their MVPs in just 4 weeks. I engineered the entire core architecture from scratch using a modern tech stack: TypeScript, Next.js, Node.js, NestJS, and MongoDB. Key technical achievements in this project include: – Seamless authentication flow (One-click Google login & magic links). – Fully integrated Stripe payment system, including subscription management and usage-based billing logic. – Production-ready AI chat module with streaming responses, rate limiting, and per-message billing. The goal of this project was to create a modular, scalable foundation with zero technical debt, allowing businesses to bypass the tedious setup phase and start building custom logic on day one.

Fiverr

Arctic Web – Full Stack Engineer

Fiverr • Full-time

Dec 2024 - Mar 2026 • 1 yr 3 mos

Designed scalable database architectures using MongoDB and PostgreSQL. Optimized frontend performance, significantly reducing time-to-market for key features in production environments. Built and maintained complex RESTful APIs using Node.js and TypeScript.

Freelancer.com

Wish Hub – Founder & Full Stack Engineer

Freelancer.com • Self-employed

Jan 2024 - Jan 2025 • 1 yr

Developed and launched a complete web platform from scratch. Designed a scalable backend with Node.js and MongoDB, integrated cloud storage, and built an intuitive frontend with Next.js and TypeScript. Implemented automated data extraction and robust user privacy settings.