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Hi, I'm Stefan Zamfira, a Front-End Developer with 9+ years of experience delivering scalable, accessible web applications. I specialize in ReactJS, TypeScript, and modern JavaScript ecosystems, with a strong focus on performance optimization, UI/UX, and developer experience. Hi there! I enjoy collaborating with designers, product managers, and mentoring developers to deliver pixel-perfect, data-driven, maintainable applications. I have shipped features for SaaS platforms, improved performance with virtualization, caching, and testing, and thrive in fast-paced teams that value quality and user experience.…Hi, I'm Stefan Zamfira, a Front-End Developer with 9+ years of experience delivering scalable, accessible web applications. I specialize in ReactJS, TypeScript, and modern JavaScript ecosystems, with a strong focus on performance optimization, UI/UX, and developer experience. Hi there! I enjoy collaborating with designers, product managers, and mentoring developers to deliver pixel-perfect, data-driven, maintainable applications. I have shipped features for SaaS platforms, improved performance with virtualization, caching, and testing, and thrive in fast-paced teams that value quality and user experience.

Stefan Zamfira

Front-End Developer, Full Stack Developer, Web Developer, +2

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Hi, I'm Stefan Zamfira, a Front-End Developer with 9+ years of experience delivering scalable, accessible web applications. I specialize in ReactJS, TypeScript, and modern JavaScript ecosystems, with a strong focus on performance optimization, UI/UX, and developer experience. Hi there! I enjoy collaborating with designers, product managers, and mentoring developers to deliver pixel-perfect, data-driven, maintainable applications. I have shipped features for SaaS platforms, improved performance with virtualization, caching, and testing, and thrive in fast-paced teams that value quality and user experience.…Hi, I'm Stefan Zamfira, a Front-End Developer with 9+ years of experience delivering scalable, accessible web applications. I specialize in ReactJS, TypeScript, and modern JavaScript ecosystems, with a strong focus on performance optimization, UI/UX, and developer experience. Hi there! I enjoy collaborating with designers, product managers, and mentoring developers to deliver pixel-perfect, data-driven, maintainable applications. I have shipped features for SaaS platforms, improved performance with virtualization, caching, and testing, and thrive in fast-paced teams that value quality and user experience.

Available to hire

Hi, I’m Stefan Zamfira, a Front-End Developer with 9+ years of experience delivering scalable, accessible web applications. I specialize in ReactJS, TypeScript, and modern JavaScript ecosystems, with a strong focus on performance optimization, UI/UX, and developer experience.

Hi there! I enjoy collaborating with designers, product managers, and mentoring developers to deliver pixel-perfect, data-driven, maintainable applications. I have shipped features for SaaS platforms, improved performance with virtualization, caching, and testing, and thrive in fast-paced teams that value quality and user experience.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

English

Fluent

Work Experience

Front-End Developer at 3E

November 1, 2023 - November 7, 2025

Frontend work on the SynaptiQ SaaS platform; optimized renewable asset performance, refactored code with memoization, lazy imports, and RTK Query caching; enabled thousands of data items handling via React virtualization; wrote unit and Playwright end-to-end tests; built a POC Progressive Web App with offline capabilities; created a reusable filtering system; integrated a custom Amplitude analytics system to analyze user behavior.

Full-Stack Developer at Deep Stream Technologies

November 1, 2023 - November 1, 2023

Full-stack ReactJS and NodeJS development; migrated legacy Angular app to ReactJS; implemented modular architecture; built reusable components/hooks/helpers; improved accessibility (WCAG) with ARIA attributes and i18n; developed end-to-end features using CQRS with Mongoose and xstate for scalable data handling.

Frontend Developer at Atelier (Ownzones)

June 1, 2022 - June 1, 2022

Frontend developer for a video platform using ReactJS, GraphQL, and styled-components; extended a custom HLS.js video player; maintained a design-system-based UI kit (Figma, styled-components, Storybook); extracted features to npm packages; integrated monitoring tools (Mux, Mixpanel, Sanity); developed a ReactJS-based Adobe Premiere Pro extension; improved QA with Cypress helpers and consistent HTML attributes.

Front End Developer (Part-Time) at TopTal

August 1, 2020 - August 1, 2020

Built a GatsbyJS + Sanity app from Figma wireframes with pixel-perfect UI; improved SEO and performance via optimized GraphQL queries; created a reusable custom UI kit and published it as a private npm package.

Front End Developer at mindit.io

December 1, 2018 - December 1, 2018

Developed a custom render system generating web app pages from Contentful CMS; enabled editors to manage content without developers; implemented white-label approach to enable non-technical users to customize colors/fonts; mentored two junior developers in ReactJS/Redux; customized Material-UI design system into reusable components.

Front End Developer at IBM

August 1, 2020 - August 1, 2020

Developed an Angular2-based web application for internal usage; delivered hybrid apps to AppStore and GooglePlay using Cordova, AngularJS, VanillaJS, and jQuery; integrated with Waze, Maps, Uber, and QRCode scanner; mentored interns in JavaScript, AngularJS, HTML, and CSS.

Front End Developer at OSF Global Services

September 1, 2015 - September 1, 2015

Delivered Demandware-based e-commerce websites; converted Photoshop wireframes to responsive sites; collaborated with QA to finalize testing.