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Hi, I’m Mykhailo Andreitsiv, a frontend developer from Lviv, Ukraine, with 5+ years of commercial experience building, maintaining, and optimizing production-ready React and Next.js apps. I specialize in core frontend engineering, predictable state management (Redux Toolkit, Zustand), and performance optimization (reducing re-renders, improving Core Web Vitals). I’m hands-on with end-to-end features and I collaborate effectively with cross-functional teams. I actively integrate AI-assisted workflows to accelerate delivery without compromising code quality, and I enjoy shipping polished, scalable UI systems and reusable components across web and mobile platforms.…Hi, I’m Mykhailo Andreitsiv, a frontend developer from Lviv, Ukraine, with 5+ years of commercial experience building, maintaining, and optimizing production-ready React and Next.js apps. I specialize in core frontend engineering, predictable state management (Redux Toolkit, Zustand), and performance optimization (reducing re-renders, improving Core Web Vitals). I’m hands-on with end-to-end features and I collaborate effectively with cross-functional teams. I actively integrate AI-assisted workflows to accelerate delivery without compromising code quality, and I enjoy shipping polished, scalable UI systems and reusable components across web and mobile platforms.

Mykhailo Andreitsiv

Front-End Developer, Web Developer, Full Stack Developer, +2

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Hi, I’m Mykhailo Andreitsiv, a frontend developer from Lviv, Ukraine, with 5+ years of commercial experience building, maintaining, and optimizing production-ready React and Next.js apps. I specialize in core frontend engineering, predictable state management (Redux Toolkit, Zustand), and performance optimization (reducing re-renders, improving Core Web Vitals). I’m hands-on with end-to-end features and I collaborate effectively with cross-functional teams. I actively integrate AI-assisted workflows to accelerate delivery without compromising code quality, and I enjoy shipping polished, scalable UI systems and reusable components across web and mobile platforms.…Hi, I’m Mykhailo Andreitsiv, a frontend developer from Lviv, Ukraine, with 5+ years of commercial experience building, maintaining, and optimizing production-ready React and Next.js apps. I specialize in core frontend engineering, predictable state management (Redux Toolkit, Zustand), and performance optimization (reducing re-renders, improving Core Web Vitals). I’m hands-on with end-to-end features and I collaborate effectively with cross-functional teams. I actively integrate AI-assisted workflows to accelerate delivery without compromising code quality, and I enjoy shipping polished, scalable UI systems and reusable components across web and mobile platforms.

Available to hire

Hi, I’m Mykhailo Andreitsiv, a frontend developer from Lviv, Ukraine, with 5+ years of commercial experience building, maintaining, and optimizing production-ready React and Next.js apps. I specialize in core frontend engineering, predictable state management (Redux Toolkit, Zustand), and performance optimization (reducing re-renders, improving Core Web Vitals).

I’m hands-on with end-to-end features and I collaborate effectively with cross-functional teams. I actively integrate AI-assisted workflows to accelerate delivery without compromising code quality, and I enjoy shipping polished, scalable UI systems and reusable components across web and mobile platforms.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

Ukrainian

Fluent

English

Advanced

Work Experience

Full Stack Software Engineer at SportCore

January 1, 2026 - Present

Architected a real-time multi-tenant tournament platform using NestJS Clean Architecture and Domain-Driven Design on the backend, integrated with type-safe React frontend via automated OpenAPI generation. Developed real-time lifecycle features, AI agents using Claude Code CLI, and a server-authoritative clock with optimistic locking to prevent race conditions; crafted AI workflows to boost development efficiency and maintain high code quality.

Full-Stack Software Engineer at SportCore

January 1, 2026 - Present

Architected a real-time, multi-tenant tournament platform using NestJS Clean Architecture and Domain-Driven Design; integrated with a type-safe React frontend via auto-generated OpenAPI; implemented high-frequency live scoring with WebSocket-driven state, scheduling, and bracket logic; built AI agents using Claude Code CLI to enhance development workflow.

Senior Frontend Developer (Part-time) at NeoDev development

January 1, 2022 - December 31, 2023

Architected frontend development and delivery for Foxi B2B SaaS system featuring an interactive billing matrix panel. Designed dynamic form data models for composite insured/out-of-pocket pricing; deeply nested Material UI forms; migrated to unified UI across platforms; updated Redux store for performance.

Senior Frontend Developer (Part-time) at NeoD Development

January 1, 2022 - December 31, 2023

Architected frontend for Foxi B2B SaaS system; designed dynamic form data models; improved Material UI forms; reduced billing transaction errors by optimizing pricing logic.

Senior Frontend Developer at Uvoteam

February 1, 2021 - April 1, 2026

Architected and maintained multiple core React (Next.js / Gatsby) product lines, driving features from discovery phase through state modeling to highly efficient production deployment. Engineered complex customer-facing dashboards with virtualized lists and WebSocket live updates; optimized Redux Toolkit + Saga state updates to eliminate unnecessary re-renders and stabilize browser rendering under heavy data loads. Designed a modular form and UI component framework in Storybook with strict validation and unified error handling across multiple product platforms. Re-factored legacy apps into cross-platform React Native (Expo) apps with unified UX and centralized state synchronization. Led a codebase-wide style migration to Tailwind CSS, dramatically reducing CSS bundle size and speeding up UI iteration cycles. Drove product-focused Web Vitals optimization campaigns (CLS/INP/LC) through fine-grained code splitting, lazy loading, and targeted React memoization. Implemented comprehensive au

Senior Frontend Developer at NeoD Development

February 1, 2021 - April 1, 2026

Architected and maintained multiple core React (Next.js / Gatsby) product lines; built a highly dynamic customer-facing dashboard with virtualized lists and WebSocket live updates; migrated styling to Tailwind CSS; migrated cross-platform React Native app to Expo; improved UI performance and state synchronization; led CI/CD improvements; established a design system.

Frontend Developer at Theatre

December 1, 2020 - February 1, 2021

Developed reusable UI components; improved code reliability by introducing standardized unit tests; actively participated in Agile ceremonies and peer code reviews.