Avatar

Emilia Sonder

Frontend developer

Building web applications with React, Next.js, and TypeScript, focusing on clean architecture and maintainable UI systems

Hey there!

I'm a frontend developer with 4+ years of experience specializing in TypeScript, React, and Next.js. I’ve worked on CRM and HRM systems, marketplaces, UI libraries, and internal business tools.

I work with REST APIs, GraphQL, WebSocket, and SSE to support real-time and data-driven interfaces. I've contributed to frontend architecture decisions, reusable component systems, development standards, and code reviews, and participated in technical interviews for frontend candidates. I regularly collaborate with backend and product teams to define implementation details and deliver features in a fast-paced environment.

Got an idea?

Work experience

Apr 2025 - present

Frontend developer

Built and maintained the front end of a real-estate marketplace using Next.js, React, and TypeScript.

Implemented key user flows.

Extended and maintained the platform’s admin panel using React.

Contributed to frontend architecture decisions, structural patterns, and development standards.

Reviewed 5-8 pull requests weekly to ensure code quality and consistency across features.

Conducted technical interviews for frontend candidates.

Collaborated with backend and product teams to define implementation details and deliver features in a fast-paced environment.

React
Next
TypeScript
JavaScript
SCSS
React Query
Shadcn
Tailwind

Oct 2024 - Apr 2025

Frontend developer

Built the front end for a social assistance management app using React, TypeScript, and MUI.

Integrated RTK, RTK Query, and SSE for real-time updates.

Wrote component tests with Vitest & React Testing Library.

Contributed to an HRM app using Next.js, TypeScript, and Mantine UI.

React
Next
Redux
TypeScript
JavaScript
SCSS
MUI
Mantine UI
RTK Query

May 2023 - Oct 2024

Frontend developer

Participated in the development of a CRM system using React and TypeScript, implementing FSD architecture principles.

Created a UI library based on MUI.

Refactored project structure and optimized code in accordance with SOLID, DRY, and KISS principles.

Assisted in developing the back end for a chat widget using WebSockets and MongoDB.

React
Redux
TypeScript
JavaScript
SCSS
Storybook
MUI
RTK Query
MongoDB
GraphQL
NodeJS
Express

Mar 2022 - May 2023

Frontend developer

Developed responsive websites from Figma designs using HTML, CSS, and JavaScript.

Integrated layouts with WordPress, including theme development and plugin setup.

Optimized website performance with SEO.

Maintained and updated websites by fixing bugs and implementing changes.

HTML
JavaScript
CSS
SCSS
PHP
WordPress