PRODUCT-GRADE FRONTEND • FULL-STACK SYSTEMS • ARCHITECTURE & BEST PRACTICES
I’m Vadym - a frontend-heavy full-stack product engineer specializing in TypeScript, React, and Next.js. I build reusable UI/platform systems, workflow-heavy product surfaces, typed data layers, and real-time runtimes with Node.js, Python/FastAPI, and WebSockets.
A small selection of recent projects.
Internal Dashboard for Game Updates
Developed an internal dashboard used by multiple teams (about 40 developers) to track game updates and manage file signatures at scale. Includes RVA search, signature CRUD with scan options and history, and a webhook system (event filters, headers, toggles) with on-demand sync.
Live site is private.
Finance dashboard
Personal finance dashboard with Plaid sandbox linking, account/transaction sync, analytics charts, filters, CSV import/export, auto-categorization, and subscription-ready flows via Lemon Squeezy.
Real-time Messenger with Workspace control
Slack-style workspace messenger with real-time channels, threads/replies, reactions, optimistic UI, invite flows, image uploads, and role-based workspace controls.
AI Platform
Multi-model AI playground with provider abstraction, reusable chat/composer primitives, streaming responses, abort/retry controls, and typed service contracts for maintainable feature expansion.
Freez Blood
Web-application for community project of game servers on CS:GO / CS2 with 1000+ concurrent users. 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
Discord-style real-time video and audio messenger with features like voice chat, video chat, file sharing, channel creation, server management, customizable servers/channels, and role-based user management.
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.
Jan 2026 – Present
Jan 2026 – Present
Product & Systems Engineer
Independent
Python real-time trading runtime / execution framework
- Built a Python real-time trading runtime with FastAPI control plane, REST/WS integrations, health monitoring, emergency pause states, and snapshot/recovery flows.
- Designed a modular Liquidity Grid execution engine with separated inventory model, policy-based routing, exit policies, and self-healing order management.
- Optimized order routing and reconciliation logic, reducing observed order rejections from ~10k to ~6k and increasing fills from ~30k to ~45k in comparable 24h windows.
- Performed exchange network-path analysis and region-aware infrastructure placement, reducing request round-trip latency from ~500–750ms to ~8–20ms; improved Linux async I/O throughput by ~25% with uvloop.
Oct 2025 – Jan 2026
Oct 2025 – Jan 2026
Frontend Engineer (Platform / UI Infrastructure)
Eleken
Internal platform + AI Proposal Builder (MVP)
- Co-defined frontend architecture with the tech lead; standardized module boundaries and reusable UI primitives.
- Built a Sheet/Modal system, scalable Form Kit, typed TanStack Query data layer, and reusable platform patterns.
- Shipped complex interactive UI: calendar views with collision logic and reusable Kanban DnD workflows.
- Built a TipTap-based Notion-like editor with AI-assisted targeted updates for document workflows.
- Improved performance via route/feature-level code splitting and dynamic imports.
Mar 2023 – Oct 2024
Mar 2023 – Oct 2024
Full-Stack Engineer (Real-Time Systems / Platform)
GODEYE LLC
Trading R&D platform
- Owned React/TypeScript frontend surfaces for strategy configuration, backtesting controls, and task monitoring.
- Designed backtesting workloads with Node Workers and multi-core execution, scaling throughput to ~1000 concurrent evaluations.
- Built typed exchange integration layers with REST/WS clients, reconnect/keep-alive handling, and request routing around rate/weight limits.
- Built a real-time Risk Engine in Node.js / NestJS using streaming market data to compute liquidation and maintenance margin metrics.
- Built abstractions for backtesting and execution simulation, including virtual order lifecycle handling and metrics collection.
My hard skills.
Frameworks & Runtimes
- React
- Next.js
- Nest.js
- Node.js
- FastAPI
Languages
- TypeScript
- JavaScript
- HTML
- Python
State Managers
- Redux
- Redux Toolkit
- Zustand
Styling & UI
- SASS
- SCSS
- Tailwind CSS
- styled-components
- shadcn-ui
Testing
- Jest
- Cypress
- React Testing Library
- Pytest
API Integration
- WebSockets
- GraphQL
- Socket.io
- REST
- TanStack React Query
Collaboration & Tools
- Git
- GitHub
- GitLab
- Jira
- Linear
- Figma
- Storybook
Third-Party & Bundlers
- React Hook Form
- Zod
- Framer Motion
- i18n
- Webpack
- Vite
- ESLint
- Storybook
- Plaid
- Stripe
- Lemon Squeezy
- TanStack Router
- React Router