Вадим

Vadym Topchieiev
Senior Frontend Engineer | React, TypeScript, Next.js
Ukraine (EET/EEST) | Remote | Contract / Full-time | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
6+ years of commercial experience building and supporting production web applications with React, TypeScript,
JavaScript, and Next.js across automotive marketplace, telecom analytics, FinTech, and workflow-heavy product
environments.
Experienced in frontend architecture, SSR and data orchestration, complex UI state, REST and WebSocket
integrations, performance optimization, automated testing, code review, release validation, and production
debugging.
Collaborates with product, design, backend, QA, and data teams to deliver reliable, maintainable user-facing
features.
Claude Certified Developer – Foundations (Anthropic), with hands-on practice using Claude API, tool use, agent
workflows, Claude Code, and MCP concepts.
TECHNICAL SKILLS
Core: React, TypeScript, JavaScript, Next.js, Remix, HTML, CSS
State & Data: React Query, Zustand, Redux Toolkit, React Hook Form, REST APIs, WebSockets
Frontend Engineering: SSR, data orchestration, frontend architecture, performance optimization, responsive UI,
reusable component systems, Storybook, Material UI
Quality & Delivery: Jest, React Testing Library, Cypress, unit/integration/E2E testing, code review, stage/prod
validation, release support, production debugging
Product & Analytics: tracking/analytics, MVT/experimentation
Tools: Git, Docker, Postman, Jira, Agile/Scrum/Kanban
Applied AI: Claude API, Claude Code, tool use, agent workflows, MCP concepts
PROFESSIONAL EXPERIENCE
SoftServe - Senior Frontend Engineer | Sep 2025 - Present | Remote, Ukraine
Project: large-scale US automotive marketplace
Tech: React, TypeScript, JavaScript, Next.js, Remix, SSR, REST APIs, tracking/analytics, Storybook
● Delivered homepage, search/discovery, and returning-user features, including carousels, recently
searched/contacted flows, price-drop modules, and product content blocks.
● Contributed to redesign and MVT/experimentation initiatives, aligning implementation with Figma, product
requirements, and tracking/analytics needs.
● Integrated frontend features with backend APIs and data-orchestration layers, handling loading states, edge
cases, fallbacks, and production data inconsistencies.
● Contributed to SSR/proxy-related changes affecting page rendering and data delivery.
● Improved UI reliability and release quality through defensive rendering, reusable components, skeleton
states, code reviews, stage/prod validation, production issue investigation, and rollback-related support.
Kyivstar.Tech - Senior Frontend Engineer | Jul 2024 - Sep 2025 | Remote, Ukraine
Project: telecom analytics and marketing segmentation platform
Tech: React, TypeScript, Zustand, React Hook Form, React Query, WebSockets, Material UI, Jest, React Testing
Library
● Built analytics dashboards and workflow-heavy interfaces for telecom marketing and segmentation use
cases.
● Integrated REST APIs and WebSocket streams for near-real-time metrics and frequent data updates without
UI stalls.
● Improved frontend performance by reducing unnecessary re-renders, refining state structure, and tightening
component boundaries.
● Built form workflows with validation, predictable state transitions, and reusable patterns using React Hook
Form and Zustand.
● Collaborated with design, backend, and data teams on feature breakdown, edge cases, and delivery
planning.

Ralabs - Frontend Web Developer | Apr 2022 - Jun 2024 | Remote, Ukraine
Projects: Data Science IDE, FinTech Investment Platform
Tech: React, TypeScript, Zustand, React Query, Storybook, Jest, React Testing Library, Cypress
● Built interactive React/TypeScript interfaces, diagram-based screens, and complex user workflows.
● Shipped onboarding and investment workflows for a UK product startup and maintained shared UI
components in Storybook.
● Improved maintainability by consolidating duplicated patterns into reusable hooks and components.
● Covered critical interactions with unit, integration, and E2E tests while improving frontend/backend error
handling and PR consistency.
EARLIER EXPERIENCE
SoftServe - Frontend Engineer | Apr 2021 - Apr 2022
Tech: React, TypeScript, Storybook, Jest, React Testing Library
● Developed composable, themeable UI components; refactored legacy UI library code and added targeted
tests around high-risk components.
Incode Group - Frontend Engineer | Dec 2020 - Apr 2021
Tech: JavaScript, React, HTML, CSS, Git
● Delivered UI features and bug fixes in a PR-based workflow, working with REST endpoints, UI state, and
edge-case handling.
SoftServe - JavaScript Developer | Apr 2020 - Dec 2020
Tech: React, Next.js, Redux, TypeScript, Jest
● Delivered React/Next.js features with Redux-based state management, fixed production bugs, and
expanded unit test coverage.
CERTIFICATIONS
Claude Certified Developer – Foundations (Anthropic) | Issued Oct 2026 | Expires Oct 2027 |
Credential

LANGUAGES
English - Upper-Intermediate (B2) | Ukrainian - Native