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Andrii Kasian - Senior Frontend Developer in Remote

Andrii Kasian

Senior Frontend Engineer specializing in React/TypeScript, architecture, and design systems

SysAidKharkiv National Automobile and Highway UniversityRemote11 Years ExperienceSenior Level

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About

Frontend engineer/lead with deep React + TypeScript experience who has built complex workflow-style interfaces (node/connection editor with debugging panel) and used RxJS to manage intricate event/state flows. Strong focus on scalable architecture (SOLID, separation of concerns), performance at scale (caching, pagination, virtualization), and reliability (memory leak investigation and cleanup), backed by disciplined code review and documentation practices.

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Key Strengths

  • End-to-end frontend architecture ownership (tech selection, state management, folder structure, API interactions)
  • Scalable, maintainable design using SOLID and separation of concerns (business logic vs UI)
  • Advanced React performance optimization (memoization, virtualization, caching, pagination, avoiding re-renders)
  • Built complex workflow editor UI (nodes/connections, configuration, debugging panel) in React + TypeScript
  • RxJS-based state/event architecture for complex event flows and real-time updates
  • Debugging and resolving memory leaks via lifecycle/effects/subscription cleanup
  • Quality enforcement via documentation, shared principles, and mandatory code reviews
  • Fast-paced delivery using incremental changes, basic QA checks, gradual rollout, and rapid iteration

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Experience

Senior Frontend DeveloperSysAid · Jan 2025 – Present
Front‑end Development Team LeadABCloudz · Mar 2024 – Jan 2025
Lead Front‑end EngineerVideal · Jun 2018 – Mar 2024
Software EngineerExadel · Sep 2016 – Jun 2018
Front‑end DeveloperCalm Lion · Mar 2016 – Sep 2016
Front‑end DeveloperGrowth Web Development · Sep 2015 – Mar 2016

Skills

ReactTypeScriptGraphQLPerformance optimizationAutomated testingCode reviewsCachingResponsive designDesign systemsDashboard developmentMentoringRelease managementAWSVue.jsAngularJS

Languages

English

Certifications

Engineering - Kharkiv National Automobile and Highway University (KhNAHU)

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Typically responds within 24 hours

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Andrii KasianSenior Frontend Engineer specializing in React/TypeScript, architecture, and design systems