Ruslan

Ruslan Yashchenko
Frontend Engineer | React, Next.js, TypeScript
Kyiv, Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
GitHub: github.com/JIetForce
LinkedIn: [open contact info](look above in the "contact info" section)

SUMMARY
Frontend Engineer with 5+ years of experience building React and TypeScript web applications for admin systems, data platforms, and user-facing products. Strong background in Next.js, Material UI, Tailwind CSS, TanStack Query, TanStack Table, React Hook Form, Redux, Zustand, i18next, and REST API integration. Builds maintainable, responsive interfaces for data-heavy workflows with attention to usability, performance, and testing. Collaborates closely with backend, product, and design teams, and supports delivery through mentoring a junior developer, participating in sprint planning, and contributing to architecture discussions.

CORE SKILLS
Frontend: React, Next.js, TypeScript, JavaScript, HTML5, CSS3
UI and Styling: Material UI (MUI), Tailwind CSS, Storybook, Responsive UI
Data and APIs: TanStack Query, TanStack Table, React Hook Form, REST APIs, Prisma, i18next
State and Testing: Redux, Zustand, Jest, React Testing Library
Tools: Git, npm

PROFESSIONAL EXPERIENCE
Frontend Engineer | Tatl Group
Feb 2025 - Present
- Developed features and dynamic pages across two concurrent projects using TanStack Table, TanStack Query, and Material UI for complex, data-heavy workflows.
- Built admin panel functionality used to manage users and platform data.
- Integrated i18next across the application to deliver full internationalization support.
- Mentored a junior developer and contributed to sprint planning, architecture discussions, API integration, and performance improvements.

Frontend Engineer | Data Management Platform
Oct 2023 - Feb 2025
- Built responsive, modular UI components with React, TypeScript, and Tailwind CSS.
- Managed complex client-side state with Zustand to improve UI responsiveness and data flow.
- Designed dynamic form components with React Hook Form, improving validation and user data handling.
- Developed and maintained tests for 20+ core components with Jest and React Testing Library, reaching 90%+ code coverage and helping reduce bugs by 30%.

Frontend Engineer | Upfit
Oct 2022 - Oct 2023
- Developed and shipped features with Next.js, Prisma, and TypeScript, including a quiz and booking calendar.
- Collaborated with product and design teams to refine UX and UI flows, contributing to a 15% increase in user engagement.
- Improved UI consistency and reduced page load times by 20% through code refactoring and lazy loading.

Frontend Engineer | Events Platform
Oct 2020 - Oct 2022
- Developed reusable UI components with React, TypeScript, and Storybook for a high-traffic events platform.
- Built and maintained user-facing features, contributing to a 10% reduction in support tickets.
- Resolved critical bugs and delivered requested improvements, contributing to a 25% reduction in reported issues.

Frontend Engineer | Chatmebot
Apr 2020 - Oct 2020
- Developed a scalable chatbot interface with React, Redux, and Material UI.
- Collaborated with backend engineers on API integration to improve data flow and reduce load times.

EDUCATION
Bachelor's Degree in Mechanical Engineering and Machining
National Metallurgical Academy of Ukraine | 2013 - 2017
Specialty: Machine Engineering | Qualification: Associate Professional in Mechanical Engineering

LANGUAGES
Ukrainian - Native
Russian - Fluent
English - Pre-Intermediate