Product-grade frontend engineering
I’m Vadym — a Frontend Engineer specializing in complex interactive UI, design systems, and performance. I build reusable platform primitives (forms, data layers, component libraries) and product features like editors, dashboards, scheduling, and real-time workflows using TypeScript, React, and Next.js.
A small selection of recent projects.
Finance dashboard
Developed to learn and demonstrate modern web development best practices. Finance dashboard with Plaid (sandbox) linking, accounts & transactions import, filters and CSV import/export with TF-IDF () auto-categorization. Paywalled via Lemon Squeezy.
Real-time Messenger with Workspace control
Developed to learn and demonstrate modern web development best practices. This project includes features like real-time communication, reactions to messages, threads/replies system, editing/deleting messages, role-based access control, image uploads, invite system, user profiles and much more.
AI Platform
It is a project designed as a combination of different AI APIs to make it easy for the user to interact with the capabilities of different AI models. The project contains best practices, is easily maintainable and extensible. The code is built and organized intelligently, divided into its own areas of responsibility.
Freez Blood
Web-application for community project of game servers on CS:GO / CS2. The application has live chat, trades, trading platform, clans and much more. The project was fully developed from scratch, taking into account all customer requirements and Figma design.
Real-time video / audio Messenger
Developed to learn and demonstrate modern web development best practices. Some of the features: ability to voice chat, video chat, send files, create channels, create servers, customize servers/channels, manage roles and users.
Production Project
Although the project has no business value, but everything is done to the highest standards: testing, architecture, module interaction, future extensibility. Anyway, you can log in to your account, change the design of the application, application themes, view pre-prepared articles, and a few other features.
My work experience.
Jun 2025 – Jan 2026
Jun 2025 – Jan 2026
Frontend Engineer
Eleken
Internal platform + AI Proposal Builder (MVP)
- Built frontend infrastructure for a production internal operations platform used daily by an ~80-person organization.
- Co-defined frontend architecture with the tech lead; standardized module boundaries and reusable UI primitives (Sheets/Modals).
- Shipped complex interactive UI: Calendar (month/week/day, collisions) + Kanban DnD kit for configurable workflows.
- Built a scalable Form Kit (React Hook Form + shadcn/ui) with strong validation and low re-render design.
- Owned Storybook + design tokens (Figma → Tailwind/shadcn); improved performance via code splitting/dynamic imports (~40%).
- Built a TipTap-based Notion-like editor + AI-assisted targeted updates for document workflows (MVP).
Mar 2023 – Oct 2024
Mar 2023 – Oct 2024
Full-Stack Engineer
GODEYE LLC
Algorithmic trading R&D platform
- Re-engineered backtesting with Node Worker Threads and job batching; scaled to ~300 concurrent evaluations.
- Built a backend Risk Engine aggregating account-wide positions and computing liquidation price + distance-to-liquidation in real time (mark price + WS updates).
- Introduced Feature-Sliced Design to the UI, speeding up new module delivery by ~30%.
- Implemented trading strategies, indicators, and reusable primitives for fast strategy prototyping.
- Designed event-driven snapshot/restore (fs, O(1)) enabling safe restarts and deterministic incident replay.
Jan 2025 – Present
Jan 2025 – Present
Frontend Engineer
Financer (Independent)
Personal finance dashboard
- Integrated Plaid (sandbox) end-to-end: Link + secure exchange + accounts & transactions sync; analytics dashboards and CSV import/export.
- Implemented subscription paywall via Lemon Squeezy (Checkout/Portal + webhook verification) with DB-backed subscription state.
Sep 2024 – Nov 2024
Sep 2024 – Nov 2024
Full-Stack Developer
Real-time Messenger (Independent)
Slack-style messenger
- Built real-time messaging with threads/replies, reactions, presence, and optimistic UI on Socket.io.
- Implemented workspace/channel model with RBAC, invites, and file/image uploads; hardened UX with guarded routes and error boundaries.
My hard skills.
Frameworks & Runtimes
- React
- Next.js
- Nest.js
- Node.js
Languages
- TypeScript
- JavaScript
- HTML
State Managers
- Redux
- Redux Toolkit
- Zustand
Styling & UI
- SASS
- SCSS
- Tailwind CSS
- styled-components
- Material UI
- shadcn-ui
- Aceternity UI
Testing
- Jest
- Cypress
- React Testing Library
API Integration
- WebSockets
- GraphQL
- Socket.io
- REST
- TanStack React Query
- RTK Query
- Apollo Client
Collaboration & Tools
- Git
- GitHub
- GitLab
- Jira
- Linear
Third-Party & Bundlers
- React Hook Form
- Zod
- Framer Motion
- i18n
- Webpack
- Vite
- ESLint
- Storybook
- Plaid
- Stripe
- Lemon Squeezy
- TanStack Router
- React Router