Design systems & DX
Component libraries, Storybook/Chromatic pipelines, and tooling that multiply a team's output. At Streak this meant a 2–5× increase in product engineering throughput.
Open to senior frontend roles
Open to freelance & consulting gigs
Software you don't have to check twice.
I'm Dmytro Lubenets — a senior frontend engineer with 14 years building and scaling production web apps at startups. Three years at Streak (YC S11) shipping CRM features used by tens of thousands of teams. Paris-based, remote-friendly across the EU and North America.
- Years of experience
- 14 yrsbuilding for the web
- Product updates gain
- 2–5×product feature updates speed via design system
- Activation lift
- +10%user activation with improved onboarding flow
What I do best
Platform-grade frontend
The three things teams usually bring me in for.
Real-time & collaborative UI
Video consultations at Maple, live trading dashboards at Coinsquare, live spreadsheets, automation and integrations editor at Streak.
Browser extensions & platform
Deep platform work: InboxSDK, service workers, content scripts, WebAssembly, performance. I reverse-engineered Gmail's production client to enable native third-party UI.
Track record
Experience
14 years across startups, scale-ups, and consultancies in North America and Europe.
-
Owned frontend architecture across greenfield products and core CRM systems at a Gmail-native CRM built as a browser extension — end-to-end feature ownership with broad autonomy. Awarded in performance reviews for product launches driving company growth.
- Design system & visual testing 2–5× throughput
- Onboarding improvement +10% activation
- InboxSDK sidebar redesign 150K+ monthly downloads
- LinkedIn integration
- Data import overhaul
- A/B experiments
- On-call & incident response
-
Product engineering and software consultancy across Canada and the US — embedded with client teams at various stages of growth.
Maple — telemedicine
Architected real-time video consultations with Twilio WebRTC across web and mobile, powering 24/7 live doctor visits.
Indigo — retail
Led development of high-performance kiosk software deployed across Indigo's retail locations.
Coinsquare — trading
Rebuilt critical trading dashboard components and migrated key modules to TypeScript, cutting runtime errors.
-
Architecture, development, and key technical decisions at an AI talent-mobility startup. Built the initial MVP, led the Angular-to-React migration, and established CI/CD pipelines.
- MVP architecture
- Angular → React migration
- CI/CD from scratch
Earlier roles (2012 – 2015)
- Waverley Software — Full-Stack Engineer (2013–2015). Built an enterprise communication platform on Cordova/AngularJS + Node.js with real-time WebSocket sync for a San Francisco startup.
- TeamDev — Full-Stack Engineer (2013). Built Cisco network security SPA dashboards for an international software company serving Fortune 500 clients.
- Code-on — Python Web Developer (2012–2013). Owned backend and frontend stacks at a full-cycle web agency: Django, jQuery, tailor-made business solutions.
Selected work
Projects
Recent work & side projects.
Cogninote
2026
Self-hosted AI knowledge management system on modern RAG architecture (LightRAG — hybrid graph + vector retrieval). BYOK across Claude, Gemini, OpenAI, and local models.
Experimental browser AI API
2025
TypeScript polyfill for the new LanguageDetector Web API — on-device language detection across 104 languages via Google's CLD3 neural network compiled to WebAssembly. Works in any modern browser.
InboxSDK
2022–2025
Contributor to the open-source Gmail extension SDK used by extensions reaching millions of users. Led the sidebar redesign by reverse-engineering Gmail's production client, enabling native third-party UI integration.
View repositoryToolbox
Skills & stack
What I actually use day to day.
Core
- TypeScript
- JavaScript
- React
- Next.js
- Node.js
- Python
- HTML5
- CSS3
State & data
- TanStack Query
- Zustand
- Redux
- RxJS
- GraphQL
- WebSockets
- WebRTC
- tRPC
Quality
- Storybook
- Chromatic
- Playwright
- Vitest
- Jest
- Testing Library
- Cypress
- Sentry
Platform & infra
- Browser extensions
- Service Workers
- WebAssembly
- Docker
- Kubernetes
- GCP
- AWS
- GitHub Actions
AI & LLM
- Claude Code
- Anthropic API
- OpenAI API
- LightRAG
- MCP
- Agentic coding
Styling & design
- Tailwind CSS
- shadcn/ui
- Radix UI
- CSS Modules
- Design systems
- Figma
Let's talk
Building something real-time, collaborative, or platform-grade?
I'm looking for senior roles at product-led startups and scale-ups. Paris-based, remote-friendly across the EU and North America. Also open to select consulting engagements.
Usually reply within a day · Consulting enquiry?
I also write about frontend and AI tooling on my Substack — come say hi.