Roman Khrystynych

Roman Khrystynych

Software Engineer building scalable solutions in Toronto

About

I'm a software developer with over 10 years of experience creating web and mobile apps. I specialize in building scalable systems using tools like React, Angular, and Node.js. As the founder of CryptoRabbit, I am building a blockchain-powered marketplace that uses AI and smart contracts for secure trading.

I'm passionate about solving problems with technology, whether it's improving user experiences, developing AI tools, or leading teams to deliver great software. Let's create something amazing together!

Recent Projects

CryptoRabbit screenshot

CryptoRabbit

2023-Present

Founded and developed a crypto-first marketplace enabling secure peer-to-peer trading of digital currencies for goods using smart contracts and AI-driven dispute resolution.

  • Architected full-stack application using React Native and Next.js
  • Implemented escrow smart contracts for secure transactions
  • Developed AI-powered dispute resolution system
  • Built GraphQL API with Apollo Server and Prisma ORM
  • Deployed scalable serverless infrastructure using AWS CDK
React NativeNext.jsBlockchainSolidity Smart ContractsApollo GraphQLAWS CDK
Appointment Prep AI screenshot

Appointment Prep AI

2024

Created an advanced multi-agent system to help users prepare for professional appointments by analyzing context and generating tailored discussion points.

Contract project in conjunction with Hint Services

  • Designed conversational AI system for appointment context analysis
  • Implemented audio transcription and analysis pipeline
  • Created dynamic question generation system based on appointment type
  • Built secure data handling system for sensitive medical information
AI/MLMulti-agent SystemsNext.jsVercel
Pet Portal AI screenshot

Pet Portal AI

2024

Developed features for an AI-powered platform for pet owners, such as subscription management, personalized pet food recommendations, and multi-agent systems for veterinary and insurance support.

Contract project in conjunction with Hint Services

  • Built a React-based frontend features with Tailwind CSS for responsive design
  • Implemented subscription management system with Stripe integration
  • Developed multi-agent system for personalized pet care recommendations
  • Created automated meal planning system based on pet profiles
AI/MLStripeMulti-agent SystemsNext.jsPostgresVercel

Latest Posts

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Blog Post

CryptoRabbit: A Native Crypto Marketplace

CryptoRabbit is a crypto-native marketplace where users can buy and sell goods using cryptocurrency. Every transaction is protected by a cryptographic contract that ensures funds are only released when both sides meet their obligations—no banks, no fiat, just secure digital commerce.

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Blog Post

Investing in Trust: The Future of Secure Crypto Commerce

This article outlines the investment case for a secure crypto marketplace that uses smart contracts to eliminate scams and protect buyers and sellers. It highlights the platform’s unique value in addressing fraud in peer-to-peer transactions, its appeal to privacy-conscious crypto holders, and its scalable, transparent business model. Designed for a growing market of crypto users, the marketplace offers a trustless, decentralized way to spend digital assets safely—positioning itself as the future of crypto commerce.

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Blog Post

What I Learned Building Agents for Multi-Agent Systems

Building multi-agent systems teaches the value of balancing complexity with efficiency. Simplicity, effective use of natural language, and clear examples are key to unlocking their full potential. This article shares practical lessons and highlights the role of natural language and examples in guiding agents effectively.

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