Senior Front-end developer

Yevhen S

Information

Available hours \ week
40 h/w
Seniority level
Senior
Years of experience
9 yrs.
Location
Ukraine
Nationality
Ukraine
Timezone
(GMT+02:00) Kyiv

Languages

English
Upper-Intermediate (B2)

About

Yevhen specialises in designing dynamic user interfaces as a Senior Front-End Developer with 9 years of experience in building scalable, high-performance web applications using React and modern JavaScript ecosystems. He focuses on front-end architecture, TypeScript-first development, and Next.js (SSR/SSG) solutions, delivering products that range from early-stage MVPs to enterprise platforms with complex business logic. He has extensive experience in scalable application design, server/client data orchestration (React Query, caching, streaming), WebRTC development, and performance optimisation. He is skilled in integrating third-party APIs and payment systems, while building reusable UI architectures and scalable, developer-friendly front-end infrastructures.

Experience

Moji

Front-end Developer

About the Project

Moji is an app for creating, distributing, and watching short-form videos about restaurants in a TikTok-style format, with live video streaming support. Chefs and restaurant owners can broadcast their kitchens in real time, while viewers can join live streams, watch videos, and discover new places through a personalized feed.

  • Food And Beverages

Responsibilities

- Set up CI/CD for deploying the project to Google Play Console and App Store Connect; - Created recording, editing, and video display functionality; - Integrated notifications; - Integrated external services to the application; - Created architecture for the project.

LiveSell

Front-end Developer

About the Project

LiveSell is a live video shopping and shoppable video platform that allows businesses to sell products through real-time, interactive video sessions. The platform supports both one-to-one consultations and large-scale live stream events, enabling brands to connect directly with customers via video, voice, and chat.

  • E-commerce

Responsibilities

- Added new responsive layouts; - Video stream implementation in the picture-in-picture video mode; - Collaborating with frontend and backend teammates; - Conduct code reviews, providing feedback to maintain code quality and consistency with project standards.

Skills & technologies

Junction Connect

Front-end Developer

About the Project

Junction Connect is an AI-native multimodal travel infrastructure platform that enables companies to search, book, and manage end-to-end travel through a single API. It aggregates flights, hotels, trains, ferries, car rentals, and other mobility services, providing unified inventory, transparent data, and automated workflows.

  • Travel

Responsibilities

- Developed and maintained user-facing features including search functionality, booking flows, and payment integration; - Implemented responsive UI components and modern CSS modules and design patterns; - Integrated third-party APIs including Stripe payment processing and Emirates authentication system; - Collaborated with backend teams to integrate RESTful APIs for bookings, pricing, and user management; - Debugged and resolved production issues across the booking funnel to improve conversion rates; - Optimized application performance and implemented best practices for Next.js server-side rendering and client-side hydration.

ProspectConverter

Front-end Developer

About the Project

ProspectConverter is an internet-based software that provides a clear, smart view into lead routing and automation. It allows you to control where leads follow up and conversion processes are directed.

  • Management

Responsibilities

- Enhanced and optimized existing features and UI layouts; - Identified, debugged, and resolved software issues; - Collaborated with cross-functional teams to implement improvements based on user feedback and project requirements; - Refactored legacy code to align with modern development standards and best practices.

Sports Management Software Solution

Front-end Developer

About the Project

A comprehensive sports management software solution, crafted by Coaches & Directors, seamlessly integrates essential business processes to streamline event administration, tournaments, leagues, camps, tryouts, and team management.

  • Sports

Responsibilities

- Developing responsive web applications; - Integrating backend APIs; - Refactoring existing code & enhancing the existing structure involve making strategic decisions to improve product effectively.

Insense

Front-end Developer

About the Project

Insense is a web application that enables users to interact with the Solana blockchain. It allows them to connect their crypto wallets, create custom tokens, manage marketplaces for token trading, and provide liquidity to pools, among other features.

  • Cryptocurrency

Responsibilities

- Development of a project based on Figma designs. This requires translating Figma design files into a fully functional website or application, ensuring the final product accurately reflects the intended design with attention to detail in UI/UX.

Skills & technologies

Geochron

Front-end Developer

About the Project

Development of remote controller application for weather.

  • Climate Tech

Responsibilities

- Development of a PWA from scratch. This involved creating a web application that has the look and feel of a mobile app, ensuring it is responsive, works offline, and is capable of utilizing device-specific features; - Development of a dynamic menu. This entails designing and implementing an interactive menu that can adapt based on user interactions or specific conditions, enhancing the user experience; - Development of a project based on Figma designs. This requires translating Figma design files into a fully functional website or application, ensuring the final product accurately reflects the intended design with attention to detail in UI/UX.

SigNoz

Front-end Developer

About the Project

SigNoz is an open-source monitoring application that helps developers troubleshoot problems in deployed applications and services.

  • Management

Responsibilities

- Take participation in improvements of the existing architechture; - Create architecture for new major features; - Writing test cases; - Integrated new APIs version to the existing code; - Refactore existing code and improve application performance; - Create reusable components and layouts; - Create responsive UI; - Collaborated with other developers and team members.

Skills & technologies

BOOST

Front-end Developer

About the Project

BOOST provides always-on storytelling and revolutionary analytics to power digital experiences for sports and media properties.

  • Sports

Responsibilities

- Implemented responsive, adaptive, pixel-perfect user interfaces in accordance with design specifications; - Conducted code reviews, providing feedback to maintain quality and consistency with project standards.

Skills & technologies

  • GatsbyJS

Solo

Front-end Developer

About the Project

Solo is the application that provides the comfortable interface to lead own expenses, income, create clients and generate invoices.

  • Banking

Responsibilities

- Add new responsive pages and layouts; - Invoice generating implementation; - Collaborate with backend and design parts; - Provide code reviews.

Skills & technologies