Sasha Ветеран

SASHA KOLISETSKY

Frontend Engineer | React, TypeScript, JavaScript, React Native

Kyiv, Ukraine · Remote worldwide · Open to EU relocation | [открыть контакты](см. выше в блоке «контактная информация») | [открыть контакты](см. выше в блоке «контактная информация»)

LinkedIn: [открыть контакты](см. выше в блоке «контактная информация»)

SUMMARY
Frontend Engineer with 6+ years of commercial experience building customer-facing web and mobile
applications using React, TypeScript, and React Native. Strong background in UI/UX implementation,
performance optimization, SEO, accessibility, and third-party API integrations. Experienced working
in Agile/Scrum environments, participating in sprint planning and release cycles.

CORE SKILLS
Frontend: React, TypeScript, JavaScript (ES6+), React Native, HTML5, CSS3, Responsive Design
State & Data: TanStack Query / Router / Table / Store, Redux Toolkit, Zustand, REST APIs, GraphQL
Visualization: D3.js, Recharts, React Recharts, React Simple Maps
Architecture: FE Architecture, Component-driven development
Performance & SEO: PageSpeed Optimization, Core Web Vitals, Lighthouse, Code Splitting, Lazy
Loading
UI / UX: Figma handoff, Design Systems, Component Libraries, Pixel-perfect implementation
Accessibility (AA+): WCAG 2.1, ARIA, Semantic HTML

PROFESSIONAL EXPERIENCE
Next League — Frontend Engineer (2023 – 2025)
• Built and maintained customer-facing web applications using React and TypeScript.
• Implemented reusable UI components based on Figma designs and shared design systems.
• Integrated third-party APIs, analytics tools, and real-time data sources.
• Improved PageSpeed and Core Web Vitals, reducing load times by 30–40%.
• Collaborated with product owners, designers, and backend engineers from sprint planning to release.

InfrontX (Engines 365) — Frontend Engineer (2019 – 2023)

• Developed interactive UI components for consumer sports and media platforms.
• Worked with live and streaming data via REST and GraphQL APIs.
• Optimized rendering performance and bundle size, improving load speed by ~25%.

FinTech Analyst & Automation Developer (Earlier career)

• Built data-driven dashboards and internal tools for monitoring financial markets including NYSE,
NASDAQ, AMEX, and FTSE stock exchanges.
• Automated market data processing and reporting workflows using JavaScript and Python.
• Worked with real-time financial data feeds, analytics pipelines, and large datasets.
KEY PROJECTS
USGA — usga.org
USOPC — usopc.org
TeamUSA — teamusa.com
LPGA — lpga.com
TGL — tglgolf.com
Breeders Cup — breederscup.com
TourCast — tourcast.pgatour.com/tourcast.html
PGA Tour — pgatour.com
NASCAR — nascar.com

LANGUAGES
Ukrainian — Native · Russian — Native · English — Upper-Intermediate (B2+) · Italian — Basic