Ruslan

Ruslan Yashchenko
Frontend Engineer

CONTACT
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)
Kyiv, Ukraine
https://github.com/JIetForce

SKILLS EXPERI ENCE
Frontend: HTML5, CSS3,
Frontend Engineer
JavaScript, TypeScript, React
(Hooks), Next.js, Material-UI 02 .2025 – now
(MUI), Tailwind CSS, Storybook, Developed new features and dynamic pages
React Hook Form, TanStack
using TanStack Table and TanStack Query with
Query.
Material-UI, creating efficient data management
State management: Redux,
Zustand. and rendering solutions for complex user
Testing: Jest, React Testing interfaces.
Library.
Led frontend development on two simultaneous
Tools/Other: Git, npm, Prisma,
REST API, i18next projects, including a comprehensive admin panel
(internationalization). with advanced data visualization and
management features.
EDUCATION I ntegrated i18next across the application to

BACHELOR`S DEGREE OF implement full internationalization support,
MECHANICAL ENGINEERING AND improving global accessibility and user
MACHINING
experience.

«NATIONAL METALLURGICAL Collaborated with backend teams on API
ACADEMY OF UKRAINE» integration and performance optimization,
2013 - 201 7
resolving critical bugs to improve application

Speciality: Machine Engineering stability and speed.
Professional qualification:
Associate Professional in Frontend Engineer
Mechanical Engineering
10.2023 – 02.2025
Built responsive, modular components using
LANGUAGE KNOWLEDGE
React, TypeScript, and Tailwind CSS, improving
Ukrainian – Native overall UI performance.
Russian – Fluent
Managed application state with Zustand,
English – Pre-Intermediate
streamlining complex data flows and improving
component responsiveness.
 Designed and implemented dynamic form
components with React Hook Form, enhancing
input validation and user data handling.
Developed and maintained unit tests (Jest, React
Testing Library) for 20+ core components,
achieving over 90% code coverage and reducing
bugs by 30%.

Frontend Engineer – Upfit
10.2022 – 10.2023
Developed and deployed new features using
Next.js, Prisma, and TypeScript, including a quiz
and a booking calendar to enhance user
experience.
Collaborated with product and design teams to
refine UX/UI flows, resulting in a 15% increase in
user engagement.
Enhanced UI consistency and optimized page
load times by 20% through code refactoring and
implementation of lazy loading techniques.

Frontend Engineer – Events Platform
10.2020 – 10.2022
Developed interactive UI components using
React, TypeScript, and Storybook, improving
code reuse and component clarity.
Built and maintained UI features for high-traffic
events, reducing support tickets by 10% and
enhancing user experience.
Resolved critical bugs and implemented user-
requested features, reducing reported issues by
25% and increasing user retention.

Frontend Engineer – Chatmebot
04.2020 – 10.2020
Developed a scalable UI for a complex chatbot
application using React, Redux, and Material-UI.
Collaborated with backend teams to integrate
APIs, reducing load times and optimizing data
flow across the application.