Oleksii Vasylenko - Web3 Developer and Technical Lead Portfolio
Professional Profile
An expert full-stack developer specializing in high-performance financial systems and cryptocurrency exchanges. With deep expertise in building mission-critical trading infrastructure, I've engineered matching engines processing 1000+ orders per second and developed sophisticated market-making systems. My technical prowess spans from React frontends to Rust backends, with particular strength in Web3 technologies and real-time data systems. I excel at architecting scalable solutions that handle massive data throughput while maintaining microsecond-level responsiveness. My track record includes implementing complex trading protocols, blockchain integrations, and real-time market data systems that power multi-million dollar trading operations.
Full Stack
Frontend to Rust
Web3
DApps & Protocols
Data Viz
Complex Systems
Performance
Optimization Expert
Key Skills & Technologies
Frontend Development
Backend Development
Data Management
Cloud & DevOps
Web3 & Blockchain
Data Visualization
Work Experience
Full-Stack Developer
@Bitsten exchange
Architected high-performance matching engine for real-time order processing and trade execution
Engineered liquidity bots integrating multiple market maker APIs to improve order book depth
Redesigned candle engine architecture for accurate OHLCV data generation and charting
Implemented WebSocket-based real-time trading system for instant price updates and order notifications
Developed comprehensive automated testing framework for order book and matching engine functionality
Integrated CoinGecko API for market data aggregation and platform listing
Web3 Developer
@Panther Protocol
Built zk-SNARK wallet engine supporting multiple blockchains with UTXO-based transaction model
Implemented end-to-end encryption protocol for secure cross-chain messaging
Identified and resolved critical vulnerabilities in Circom circuits during security audits
Integrated zero-knowledge proof system for private transactions while maintaining verifiability
Web3 Developer
@Mailchain
Integrated major blockchains including Ethereum, ENS, and Near for wallet-to-wallet messaging
Built encryption test suite ensuring secure message delivery across protocols
Developed Near Mailchain Widget enabling dApps to embed messaging functionality
Optimized UI performance achieving high Lighthouse scores for Core Web Vitals
Implemented wallet integrations for MetaMask, WalletConnect, and other popular providers
Created TypeScript SDKs with comprehensive documentation for third-party developers
Frontend Architect
@PropertyGuru
Engineered a unified payment service adopted across multiple product teams
Led migration from monolithic to micro frontend architecture using TypeScript
Implemented Webpack Module Federation for independent team deployments
Built interactive Tableau dashboards for business intelligence and analytics
Frontend Architect
@ZuZu Hotels
Implemented Progressive Web App features for offline booking capability
Established component-driven development workflow with Storybook documentation
Optimized bundle size and initial load times using Webpack code splitting
Rust Developer
@Kobvel Software ConsultingDeveloped smart contracts for Solana's Metaplex NFT marketplace
Created frontend interfaces for Solana-based e-commerce platforms
Implemented Rust to WebAssembly compilation for browser-based blockchain interactions
Senior Full-Stack Developer
@Xen TechnologiesIntegrated third-party KYC/AML APIs for identity verification workflows
Developed responsive web applications for cross-platform compatibility
Implemented ERC-20 compliant smart contracts for tokenized investment funds
Head of Product Development
@Data Laboratories
Led distributed engineering team across multiple time zones
Architected D3-based data visualization platform for real-time analytics
Established security protocols and best practices for enterprise clients
Full-Stack Developer
@LohikaDeveloped real-time flight data visualization modules using D3
Integrated Amadeus GDS and Google Maps APIs for travel booking platform
Built ASP.NET MVC backend services for high-traffic travel applications
Side Projects
Trading Statement
Trading Analytics
Developed tradingstatement.io, a fintech platform that helps traders track and analyze their trading performance, providing detailed insights and analytics for better decision making.
Skillcrucial.com
3,000+ users
Founded Skillcrucial.com, an online coding school, where I designed a robust CMS and created distributed systems for efficient task validation. Since its launch, Skillcrucial.com has attracted over 3,000 users, facilitating a community-driven learning platform for aspiring developers.
Mynft.is
Portfolio tracking
Developed an NFT dashboard (mynft.is) offering comprehensive data visualization and portfolio management, leveraging OpenSea and Ethereum data.
Open Source
Mailchain SDK JS
Open Source
Developed JavaScript SDK for Mailchain, a messaging protocol enabling cross-protocol communication. The SDK allows users to send messages to any blockchain address across different protocols, making blockchain communication more accessible and unified.
Education
Bachelor of Computer EngineeringWith Honors
Sevastopol National Technical University
Completed a comprehensive program in Computer Engineering, focusing on software development, computer architecture, and systems design.
Graduated with honors, maintaining a high academic performance throughout the program
Specialized in software engineering and distributed systems
Completed thesis on distributed computing optimization
Communities
Skillcrucial
Mentoring different developers to become better js developers
Lecturer on Elliptic Curve Cryptography and Math at zkmonk.org, teaching fundamental mathematical concepts behind zero-knowledge proofs
Why Hire Me
Extensive Web3 Expertise
With years of experience in blockchain technologies, smart contracts, and decentralized applications, I bring cutting-edge knowledge to your Web3 projects.
Full-Stack Proficiency
My diverse skill set spans front-end, back-end, and blockchain development, allowing me to contribute to all aspects of your project.
Proven Track Record
I've successfully delivered complex projects for renowned companies, consistently meeting and exceeding expectations.
Innovation-Driven
I'm passionate about exploring new technologies and finding innovative solutions to challenging problems.
Strong Collaboration Skills
I excel in team environments, leveraging my communication skills to ensure smooth project execution and knowledge sharing.
Ready to bring innovation and expertise to your team? Let's connect and discuss how I can contribute to your success.
Let's Connect →Get in Touch
Feel free to reach out through any of these channels. I'm always open to new opportunities and connections.