Vladimir Ryzhak

DeFi Engineer

Contacts

Summary

Senior Blockchain and Full-Stack Engineer with 12+ years of experience architecting decentralized applications, smart contracts, and scalable microservices. Proven track record of leading technical strategy—from launching a fully functional USD-pegged stablecoin to building custom DAO frameworks and enterprise-grade ticketing platforms. Passionate about bridging Web3 innovation with robust, production-grade engineering, with a strong emphasis on security auditing and team leadership.

Skills & Tech Stack

Blockchain: EVM/UTXO networks, Solidity, Foundry, Geth
Backend: Node.js, PHP, Python, Go, Java, C#, Rust
Databases: MySQL, PostgreSQL, MongoDB, Redis, ClickHouse, Supabase
Infrastructure & Tools: Docker, Ansible, CI/CD (GitHub Actions), Cloudflare, Azure, Grafana, Prometheus
Frontend: React, Angular, TypeScript
Mobile: React Native, Android, iOS
Other: Machine Learning (Python), Message Queues (Bull, Kafka, RabbitMQ), OpenAPI/Swagger

Smart Contract Security Audits Portfolio

🔗 github.com/ryzhak/audits

Experience

DeFi Engineer

LiteCrypto Business · Feb 2026 – Present
business.litecrypto.org

  • Created scalable microservices for cryptocurrency payment processor.
  • Researched integrations with new blockchain networks.
  • Built UI for end users.

Key Achievements:

  • Launched a cryptocurrency payment gateway.
  • Built a cryptocurrency exchange.

Stack: TypeScript, Node.js, Postgres, BullMQ, React
Infrastructure: GitHub CI/CD, Cloudflare

Blockchain Technical Architect

Ubiquity Finance · Oct 2022 – Jan 2026 · 3 yrs 4 mos
github.com/ubiquity

  • Developed smart contracts, frontend, and backend microservices.
  • Gathered requirements from the CEO and decomposed tasks for the development team.
  • Researched integrations, technologies, and methods for optimal business solutions.
  • Conducted code reviews and introduced a unified Kanban board for all projects.
  • Formalized PR requirements and created a task priority matrix.

Key Achievements:

  • Launched a USD-pegged stablecoin (UUSD).
  • Built a GitHub bot with a plugin system to automate company workflows.
  • Developed microservices for fiat/crypto payouts and a Gnosis faucet.
  • Created backend plugins for the GitHub bot: pricing, task-matcher, xp, vector-embeddings, register-crypto-wallet, auto-pr-merge, auto-disqualifier, start-stop-task, conversation-rewards.
  • Developed UI frontends: demo stand, tasks, UUSD on-ramp, UBQ staking, permit2 allowance, onboarding, notifications, PK cipher, and audits.
  • Implemented off-chain signed NFT rewards and an optimal RPC handler library.
  • Performed security audits of smart contracts.

Stack: Solidity, Foundry, TypeScript, Node.js, Supabase, Pinecone, Curve, Aave, Chainlink, OpenRouter
Infrastructure: GitHub CI/CD, Cloudflare, Azure

Blockchain Engineer (Freelance)

Freelance · Oct 2021 – Sep 2022 · 1 yr

  • Developed smart contracts and frontend for a cryptocurrency exchange based on Uniswap v2 (additional details under NDA).

Stack: React, Solidity

Full Stack Engineer

crypto.tickets · Jan 2019 – Sep 2021 · 2 yrs 9 mos
ticketscloud.com

  • Developed mobile applications, frontend, backend microservices, and smart contracts.
  • Maintained a private Proof-of-Authority (PoA) blockchain.

Key Achievements:

  • Developed the mobile ticketing app “Vibe”.
  • Built the “Ticketscloud Scanner” app for barcode scanning.
  • Created microservices for PoA blockchain interaction, event importing, and monitoring.
  • Launched a PoA blockchain based on Geth.
  • Designed smart contracts for ticket sales and bonus accounting.

Stack: React Native, Android (Java/Kotlin), iOS (Swift), Node.js, Python, Ansible, Grafana, Prometheus, Geth

Blockchain Engineer

Theta DAO · Aug 2018 – Dec 2018 · 5 mos
github.com/Thetta

  • Developed smart contracts for a Decentralized Autonomous Organization (DAO) framework.
  • Built the frontend/backend for DAO users.

Key Achievements:

  • Created a smart contract framework for launching DAOs.
  • Developed a user-facing frontend for interacting with the DAO.

Stack: Solidity, React, Node.js

Full Stack Engineer

Intis Telecom Asia · Apr 2016 – Jul 2018 · 2 yrs 4 mos
intistele.com

  • Developed internal and external web services for the company.

Key Achievements:

  • Built “Dobrokassa” – a web service for debt purchase (integrated with SOAP from NBKI and cloud signatures via Kontur.Diadoc).
  • Developed “cli.co” – an analytics and URL shortening service.
  • Created a web service for interacting with the LinkedIn API.

Stack: Angular, PHP (Yii2), Node.js (Express), MySQL, ClickHouse, Bull Message Queue, OpenAPI/Swagger

Full Stack Engineer (Freelance)

Freelance · Aug 2015 – Mar 2016 · 8 mos

  • Developed various third-party projects (see portfolio below).

Full Stack Engineer

FC Krasnodar · Nov 2013 – Jul 2015 · 1 yr 9 mos
fckrasnodar.ru

  • Developed internal web services for FC Krasnodar.
  • Maintained and supported the official FC Krasnodar website.

Key Achievements:

  • Built a web service for medical inventory management.
  • Developed a web service for camera surveillance.
  • Created an analytics web service for tracking loaned football players.
  • Launched the website for the FC Krasnodar youth academy.
  • Built an online clothing store.

Stack: Angular, PHP (Yii2), Joomla, Bitrix

Education

Kuban State University · 2014
Diploma of Specialist in Computer Science and Applied Mathematics

Kuban State University · 2014
Bachelor’s Degree in Translation and Interpreting (English)

Languages

  • Russian: Native
  • English: C1 (Advanced)

Projects

Blockchain

Web & Mobile

Tutorials

Additional Information

  • Blog: https://www.ryzhak.com
  • Citizenship: Russia
  • Relocation: Ready to relocate and travel on business trips.
  • Driving License: Category B (own car).