Async-threads
A library that combines async and parallel programming in Node, letting you spread work across worker threads behind a Promise-based API.
Open to new opportunities · Kyiv, Ukraine · Remote-friendly
Ihor Onyshchenko
Senior Software Engineer
I build scalable web products and lead the teams that ship them. Nine-plus years across DeFi/Web3, AI-driven applications and privacy-focused platforms, with deep roots in React, TypeScript and Node.js.
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About
I'm a software engineer from Kyiv who has spent the last nine years moving between frontend leadership and full-stack architecture. I like problems where the hard part is structural: splitting a monolith into packages a team can own, isolating privacy-critical writes from read-heavy paths, or making an early-stage blockchain SDK behave in production.
Most recently I architected CQRS-style backend services for a privacy-focused platform and brought AI agents into the delivery pipeline for code generation, PR review and log analysis. Before that I led a frontend team building decentralized exchanges on Ethereum, NEAR and Concordium, and before that I was the full-stack lead on a high-traffic website builder where I cut page loads from seconds to milliseconds.
I care about fast interfaces, honest code reviews and helping other developers grow.
Education
Software Engineering
Igor Sikorsky Kyiv Polytechnic Institute
2015 – 2019
Languages
- English — advanced / fluent
- Ukrainian — native
- Russian — native
Based in
Kyiv, Ukraine
Open to remote and relocation
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Experience
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Full Stack Developer at Responsum
Privacy-focused platform. Backend architecture, package ecosystem, infrastructure and AI tooling.
- Architected scalable backend services using a CQRS-inspired design that strictly isolates privacy-critical commands from read-heavy operations, ensuring audit compliance and data integrity.
- Spearheaded the move to a modular multi-package ecosystem, extracting core business logic and shared utilities into independent npm packages used across frontend apps.
- Integrated AI agents into the dev lifecycle to automate code generation, run initial security and style PR reviews, and parse logs for anomalies in real time.
- Introduced Terraform for infrastructure configuration and wired up Grafana with custom Claude AI skills to streamline log, trace and metric analysis.
- Owned the deployment pipeline end-to-end with Jenkins and Docker for reproducible, secure builds.
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Lead Frontend Developer at Tacans
DeFi / Web3. Led the frontend team and shipped DEX platforms across EVM and non-EVM chains.
- Led and scaled the frontend engineering team from 3 to 7 developers: task distribution, technical architecture, code reviews and technical interviewing.
- Architected and deployed multiple decentralized exchange (DEX) platforms on Ethereum (EVM) and on non-EVM ecosystems NEAR and Concordium.
- Integrated hardware and software wallets including MetaMask, WalletConnect, Concordium Wallet and Ledger.
- Worked directly with Concordium core developers through dedicated channels to debug early-stage SDKs, propose fixes and implement native blockchain integrations.
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Lead Full Stack Developer at Weblium
High-traffic website builder. Full-stack lead, performance and core platform modules.
- Acted as full-stack lead: guided developer growth, ran deep code reviews and enforced architectural best practices across the platform.
- Solved critical performance and rendering bottlenecks, cutting page load times from multiple seconds to milliseconds and significantly boosting SEO scores.
- Designed and integrated core platform modules including custom popups, store and e-commerce integrations, and complex user site controls.
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Senior Frontend Developer at Seezona
E-commerce platform. Performance, analytics and a rebuilt admin panel.
- Improved site performance, page load times and interface responsiveness across the platform.
- Implemented advanced analytics tracking to capture key user behaviour for data-driven product decisions.
- Rewrote the administrative management panel from scratch for faster inventory and order management.
- Built an interactive Body Shape Visualization feature that lets shoppers preview garments on different body types.
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Middle Frontend Developer at SE Infotech
Confidential project under NDA, built with a TypeScript / React stack.
- Collaborated with the team on a confidential product using TypeScript, React, Redux, Lerna, JSS, JSTP and metaschema.
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Full Stack Developer at Stearling
Landing pages and web portals delivered under NDA.
- Developed several landing pages and web portals with a React front end and Node / Ruby on Rails back ends.
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Skills
Languages
Frontend
Web3
Backend & Cloud
Testing & Observability
Build Tools & AI
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Side projects
Embedded Music Player
An AirCast music player for the Orange Pi single-board computer, bridging a Node control layer with native C++ audio.
WebRTC Conference
A lightweight app for spinning up video conferences in the browser, with a React client and a Medooze media server backend.
More experiments with LEDs, Rust and embedded hardware live on GitHub.
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Let's work together
I'm currently looking for a Senior or Staff engineering role, hands-on or leading a team. If you're building something ambitious, I'd love to hear about it.
- Email ihor.jsdev@gmail.com
- GitHub github.com/flaminisx
- LinkedIn linkedin.com/in/igor-onyshchenko
- CV Download PDF