Андрій

ANDRII YANISEVYCH
Senior Frontend Engineer • React • TypeScript
Vinnytsia, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
LinkedIn

PROFESSIONAL SUMMARY
Senior Frontend Engineer with 7+ years of experience architecting React/TypeScript applications for fintech, AI fraud detection,
iGaming, and automotive industries. Deep expertise in MUI DataGrid, Apollo GraphQL, and performance optimization of data-
heavy UIs. Proven record of delivering scalable UI systems, building reusable component libraries, mentoring engineers, and
owning features end-to-end in Agile teams. Strong foundation in OOP, SOLID, TDD/BDD, and accessibility (WCAG).

CORE SKILLS
Languages & Core: JavaScript (ES6+), TypeScript, HTML5, CSS3, SCSS, OOP, SOLID, Clean Code
Frameworks & UI: React, React Native, Redux Toolkit, React Hook Form, Zod, Material UI (MUI, DataGrid), Tailwind CSS
API, Testing & Tools: GraphQL (Apollo), REST, WebSockets, Jest, React Testing Library, TDD/BDD, Git, CI/CD, Code Review,
Claude Code
Other: Accessibility (WCAG), Performance Optimization, Cross-browser Compatibility, Agile (Scrum, Kanban), MongoDB,
Express.js, English B2

PROFESSIONAL EXPERIENCE
Frontend Developer | Gameinspire Sep 2025 – Present
Project: Scalable back-office admin panel for player management with dynamic profile editing and large-scale data export.
• Architected a flexible CSV/XLSX export system handling 100K+ record datasets with pagination and streaming, reducing
memory footprint by ~70% vs. the naive approach.
• Designed a schema-driven player profile management system with deeply nested data and partial GraphQL updates, cutting
new-field rollout time from days to hours.
• Built advanced MUI DataGrid functionality (grouped column visibility, persistent user state, customizable configs), improving
operator productivity.
• Optimized data fetching via paginated queries, Apollo cache normalization, and render memoization to speed up heavy-
table interactions.
• Created reusable, type-safe abstractions (hooks, config-driven components, utilities) adopted across the codebase.
Tech: React, TypeScript, GraphQL (Apollo Client), MUI (DataGrid), React Hook Form, Zod

Freelance Frontend Developer | Self-employed Dec 2024 – Sep 2025
Project: Web projects for local and international clients: corporate sites, landing pages, and SPAs.
• Delivered production landing pages with LiqPay payment integration (including installment flows) and multi-section
animated layouts.
• Translated client requirements into scalable solutions balancing performance, maintainability, and time-to-market; covered
critical logic with Jest tests.
Tech: React, TypeScript, JavaScript, Jest, LiqPay API

Senior JavaScript Software Engineer | Ciklum (AI Fraud Detection) Oct 2023 – Nov 2024
Project: AI-powered enterprise platform that identifies individuals involved in financial fraud.
• Developed AI-assisted modules that translated complex ML outputs into actionable dashboards for fraud analysts.
• Led a cross-team redesign and performance-optimization initiative, improving render times on data-heavy screens and
Lighthouse scores.
• Built and maintained an internal reusable React component library adopted across product modules, improving UI
consistency and shortening delivery.
• Improved WCAG accessibility across core flows; mentored mid-level engineers via code reviews and design sessions.
Tech: React, TypeScript, JavaScript, Jest, REST API

JavaScript Software Engineer | Ciklum (iGaming Platform) Apr 2021 – Oct 2023
Project: Online casino platform featuring live-dealer games: Roulette, Blackjack, Poker, Baccarat.
• Developed 4 production online casino games (Roulette, Blackjack, etc.), responsible for game logic and UI.

• Designed a configurable game-engine abstraction enabling new games to be added via configuration with no code changes,
significantly reducing onboarding time for new titles.
• Mentored junior developers; optimized apps for cross-browser and low-end mobile compatibility.
Tech: React, Redux, TypeScript, JavaScript, Jest

JavaScript Software Engineer | Delphi Software (Automotive) Dec 2019 – Apr 2021
Project: Voice-control tooling for automotive companies integrating voice interfaces into vehicle systems.
• Implemented voice-control features and dashboard UI; delivered localization for 50+ languages ensuring consistent UX
across global markets.
Tech: JavaScript, TypeScript

Frontend Developer | Intellica Mar 2019 – Dec 2019
Project: Flexible tracking platform adaptable to healthcare, IT, and education verticals.
• Built a multi-purpose tracking web application from scratch with a flexible architecture supporting rapid feature expansion;
authored technical documentation.
Tech: React, Redux, JavaScript, TypeScript

Frontend / Web Developer | Asta.mobi Oct 2017 – Oct 2018
• Delivered UI, core components, and responsive layouts for a Ukrainian car-rental SPA, an application-tracking service, and a
WordPress corporate site with CMS editing for non-technical users.
Tech: React, JavaScript, WordPress

EDUCATION
Master of Science, Computer Science — Vinnytsia National Technical University (2021)
Bachelor of Science, Computer Science — Vinnytsia National Technical University (2019)