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 processing 1,000+ orders/sec, reducing trade execution latency by 40% and increasing platform throughput by 35%
Engineered liquidity bots integrating 5+ market maker APIs, boosting liquidity pool depth by 60% and reducing bid-ask spreads by 25%
Redesigned Kindle engine architecture, improving data accuracy to 99.99% and reducing API response times by 300ms
Implemented WebSocket-based real-time trading system, eliminating 95% of trade delays
Developed automated testing framework covering 95% of order book functionality, reducing production bugs by 80%
Integrated with CoinGecko API, increasing platform visibility by 40%
Web3 Developer
@Panther Protocol
Built zk-SNARK wallet engine supporting 5+ blockchains, processing 10,000+ UTXOs/sec with 99.9% accuracy
Implemented end-to-end encryption protocol reducing attack surface by 70% and achieving 100% secure message delivery
Resolved 15+ critical vulnerabilities in Circom circuits, achieving 100% clean security audit results
Integrated zero-knowledge proof system reducing verification times by 60% while maintaining 100% accuracy
Web3 Developer
@Mailchain
Integrated 3+ major blockchains (Ethereum, ENS, Near), increasing user base by 40% and transaction volume by 35%
Built encryption test suite with 95%+ coverage, reducing security incidents by 90%
Developed Near Mailchain Widget adopted by 50+ dApps, increasing platform usage by 25%
Optimized UI performance to 98+ Lighthouse scores, improving user retention by 30%
Implemented wallet integrations supporting 1M+ users with 99.99% uptime and zero security breaches
Created SDKs used by 500+ developers, reducing integration time by 70% through comprehensive documentation
Frontend Architect
@PropertyGuru
Engineered a versatile payment service adopted across teams.
Transitioned from monolithic to micro frontend architecture with TypeScript.
Revamped frontend deployment using Webpack federated modules.
Enhanced user interaction through advanced Tableau dashboards.
Frontend Architect
@ZuZu Hotels
Boosted app performance with PWA features.
Implemented a component-driven development approach with Storybook.
Optimized initial load times using advanced Webpack strategies.
Rust Developer
@Kobvel Software ConsultingDeveloped smart contracts for Solana's Metaplex.
Created user-friendly interfaces for Solana-based e-commerce platforms.
Senior Full-Stack Developer
@Xen TechnologiesIntegrated partner APIs into KYC/AML systems.
Developed responsive, cross-platform applications.
Implemented investment fund smart contracts.
Head of Product Development
@Data Laboratories
Led a distributed team across four time zones.
Designed interactive D3-based data visualization dashboards.
Developed robust security protocols.
Full-Stack Developer
@LohikaDeveloped real-time data visualization modules with D3.
Integrated APIs like Amadeus and Google Maps.
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.