Senior Frontend Developer - Scalable & High-Performance Web Applications
Aktualisiert am 26.03.2025
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 26.03.2025
Verfügbar zu: 100%
davon vor Ort: 20%
TypeScript
React
Vue.js
CSS3
JavaScript
PHP
HTML
REST
Jest
Playwright
Cypress
Git
Node.js
Shopware
Symfony
lit
GraphQL
Docker
AWS
English
C2
German
B2
Polish
native

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

2 Jahre 8 Monate
2022-08 - heute

Agency development

Frontend Developer (freelance) React.js Next.js Nuxt.js ...
Frontend Developer (freelance)
A web agency implementing individual software solutions for large corporations
  • Developed large-scale applications for the healthcare, farming, and e-commerce sectors. Engineered complex UI solutions tailored to enhance user experience. Ensured robust cross-browser compatibility and optimised performance through intelligent automation. Delivered visually appealing, intuitive user interfaces, significantly boosting user engagement and satisfaction. Leveraged prompt engineering and AI-assisted development for smarter, adaptive interfaces. Due to the sensitive nature of these projects, specific details remain confidential.
React.js Next.js Nuxt.js Vue.js Redux Pinia Turborepo Node.js Express.js SCSS Stripe AWS Docker OpenAI
DEVParadise, Berlin (Germany)
Remote
7 Monate
2024-06 - 2024-12

Migration of a B2C e-commerce platform

Frontend Developer (freelance) Shopware 6 Twig PHP ...
Frontend Developer (freelance)
E-commerce digital agency creating sustainable, growth driven digital results
  • Successfully migrated a B2C e-commerce platform from Shopware 5 to Shopware 6, ensuring a smooth transition within a tight deadline. Boosted conversion rates by refining product detail pages and CMS modules for an outstanding user experience (UX). Developed custom plugins to enhance platform capabilities, optimizing performance and addressing specific business needs. Worked closely with crossfunctional teams to integrate new features seamlessly while maintaining high code quality and meeting project timelines.
Shopware 6 Twig PHP Symfony SCSS Bootstrap Docker SQL
Netformic GmbH, Stuttgart (Germany)
Remote
1 Jahr
2023-10 - 2024-09

Front-end redesign of the website

Web Developer (freelance) JS TS React.js ...
Web Developer (freelance)
  • Working for a client of (on request) - a nationwide award-winning green electricity and gas provider and the largest e-mobility provider in Germany
  • I spearheaded the frontend transformation of the company?s website and customer portal, aligning it with the new corporate design to deliver a modern, accessible, and user-centric experience. By optimising the UI/UX and ensuring full compliance with accessibility standards, I played a crucial role in increasing customer engagement and satisfaction, as reflected in feedback-driven performance metrics.
  • Post-relaunch, I continued to develop and optimise the customer portal, introducing new features and refining React.js applications within a monorepo architecture. Operating within an AWS-powered infrastructure, the platform maintained scalability, reliability, and high availability. Additionally, I played a key role in CI/CD pipeline integration, agile development workflows, and rigorous code reviews, ensuring efficient deployment cycles, maintainable codebases, and a high-performance frontend ecosystem. Alongside the ongoing development of new features and applications, I actively refactored code, implemented upgrades, and reduced technical debt to enhance maintainability, performance, and long-term scalability.
JS TS React.js Redux SCSS Vanilla Extract BEM Jest Playwright Turborepo AWS Contentful
auf Anfrage
Remote
8 Monate
2023-02 - 2023-09

Various projects for European clients

Web Developer (freelance) JS TS Vue.js ...
Web Developer (freelance)
A software development company, working on multiple projects for diverse European clients
  • Together, we launched three end-to-end online e-commerce stores and worked on a B2B SaaS investment platform for a German bank. With extensive experience, I have successfully executed visually appealing and userfriendly interfaces, core features (PDP, checkout, payment) and components. Additionally, I have conducted code reviews, devised test concepts, resolved bugs, implemented designs and proposed UI solutions.
  • I met a challenging deadline for the relaunch of a new shop, resulting in significant revenue growth. Moreover, I helped accomplish the development of an MVP within a span of 3 months, enabling the client to sustain their business and attracting a larger audience through improved SEO. Furthermore, I have developed a custom internal tool that significantly reduced UX research time from several days to just a few minutes after data upload. As well as created responsive and reusable web components for the company wide design system in the micro-frontend application.
JS TS Vue.js Nuxt.js Vue Composition API React.js Lit Shopware PWA Shopware Frontends Shopware 5 PHP Twig TailwindCSS Sass BEM Web Components Micro-frontends Cypress Jest Docker
Kleerly GmbH, Köln (Germany)
Remote
6 Monate
2022-03 - 2022-08

Various projects for European clients

Web Developer (freelance) JS TS Vue.js ...
Web Developer (freelance)
A software development company, working on multiple projects for diverse European clients
  • Together, we launched three end-to-end online e-commerce stores and worked on a B2B SaaS investment platform for a German bank. With extensive experience, I have successfully executed visually appealing and userfriendly interfaces, core features (PDP, checkout, payment) and components. Additionally, I have conducted code reviews, devised test concepts, resolved bugs, implemented designs and proposed UI solutions.
  • I met a challenging deadline for the relaunch of a new shop, resulting in significant revenue growth. Moreover, I helped accomplish the development of an MVP within a span of 3 months, enabling the client to sustain their business and attracting a larger audience through improved SEO. Furthermore, I have developed a custom internal tool that significantly reduced UX research time from several days to just a few minutes after data upload. As well as created responsive and reusable web components for the company wide design system in the micro-frontend application.
JS TS Vue.js Nuxt.js Vue Composition API React.js Lit Shopware PWA Shopware Frontends Shopware 5 PHP Twig TailwindCSS Sass BEM Web Components Micro-frontends Cypress Jest Docker
Kleerly GmbH, Köln (Germany)
Remote
8 Monate
2021-08 - 2022-03

Development and provision of robust applications

Web Developer (freelance) JavaScript React.js Next.js ...
Web Developer (freelance)
A software enterprise specialising in the development and deployment of robust applications for clients with extensive customer networks
  • I have successfully created a multistep assistant for planning and booking custom group tours, along with a user-facing booking configurator on a travel agency platform. Integrated the project into a large Aurelia.js ERP platform. In this role, I efficiently translated detailed requirements into wireframes and designed the application's architecture. 
  • Single-handedly developed the solution from scratch within a remarkable timeframe, 1 week before the planned date.
  • I empowered the client's employees to prepare custom tours for showcasing purposes three times faster, resulting in a significant 10% increase in sales. Additionally, I was responsible for designing the user experience (UX) and user interface (UI) of the booking assistant, ensuring a seamless and intuitive journey for users.
JavaScript React.js Next.js Redux Less and BEM Full Calendar library Google Maps Google Autocomplete API Node.js
SIO AG, Köln (Germany)
Remote
6 Monate
2021-03 - 2021-08

Global talent pool of freelancers

Frontend Developer (Full-time) JavaScript Nuxt.js Vuetify.js ...
Frontend Developer (Full-time)
A platform connecting businesses with a global talent pool of freelancers, facilitating the hiring and collaboration process for various projects and tasks
  • Contributed to numerous features within the job search platform, admin panel and client landing pages as a member of a 15-person Scrum team. In addition, I took the lead in creating comprehensive UI guidelines that served as valuable references for frontend developers, designers, and QA professionals. I played a crucial role in the development and deployment of the API Factory, a pivotal component which improved code cleanliness and facilitated seamless integration of new features into the system.
JavaScript Nuxt.js Vuetify.js Vuex SASS
Twago, Berlin (Germany)
Remote
8 Monate
2020-07 - 2021-02

Stock market community platform

Frontend Developer (Full-time) JavaScript React.js React Native ...
Frontend Developer (Full-time)
Stock market community platform specialising in financial news and market analysis, providing valuable insights and information to investors and traders
  • I developed essential features for both the desktop and mobile versions of a chat application. Implemented an interactive product tour customised for new users, optimising their onboarding experience within the chat platform. Additionally, by introducing new features and pages to the live website, I successfully expanded the user base and subscriber count, enhancing engagement and driving significant growth.
JavaScript React.js React Native MobX Node.js WordPress PHP SEO Styled Components
Bull Markets Media, Berlin (Germany)
Onsite/ Remote
6 Monate
2019-11 - 2020-04

Individual health needs

Frontend Developer JavaScript React React Hooks ...
Frontend Developer
Company that offers personalised supplement plans and delivers custom- formulated nutrient packs based on individual health needs and goals.
JavaScript React React Hooks Redux Node.js GraphQL Styled Components Semantic UI
Baze Labs GmbH, Berlin (Germany)
6 Monate
2019-05 - 2019-10

Car Dealer Homepage

Frontend Developer (Part-time) JavaScript React.js Next.js ...
Frontend Developer (Part-time)
An automotive dealership, specialising in providing exceptional luxury and performance vehicles to discerning customers. Page has 30K visitors weekly.
JavaScript React.js Next.js Redux Sass REST API.
Berlin (Germany)

Aus- und Weiterbildung

Aus- und Weiterbildung

1 Jahr
2019-01 - 2019-12

Web Development Bootcamp

ReDi School of Digital Integration, Berlin (Germany)
ReDi School of Digital Integration, Berlin (Germany)
Javascript and React.js course - Learning advanced JavaScript and React by working on a real challenge provided by IDMC
2 Jahre 9 Monate
2016-09 - 2019-05

Study - English Philology/ Translation

Bachelor of Arts, Adam Mickiewicz University, Poznan (Poland)
Bachelor of Arts
Adam Mickiewicz University, Poznan (Poland)

Position

Position

SENIOR FRONTEND DEVELOPER

Kompetenzen

Kompetenzen

Top-Skills

TypeScript React Vue.js CSS3 JavaScript PHP HTML REST Jest Playwright Cypress Git Node.js Shopware Symfony lit GraphQL Docker AWS

Produkte / Standards / Erfahrungen / Methoden

Profile
Senior Frontend Developer - Scalable & High-Performance Web Applications. As a results-driven Frontend Developer, I specialise in React.js, Vue.js, TypeScript and e-commerce platforms like Shopware, delivering high-performance, user-centric applications. With 5+ years of experience across startups, mid-sized businesses, and large enterprises, I have successfully collaborated with diverse teams in agile environments. I optimise UX, boost conversion rates, and enhance frontend architecture, thriving in fast-paced, crossfunctional teams to drive business success. 

Skills and tools
  • Frontend
    • React.js, Vue.js, Next.js, Nuxt.js, JavaScript, TypeScript, GraphQL, Lit, React Native, PHP, Node.js, HTML, CSS, SCSS, SASS, LESS, Media Queries, Container Queries, BEM, TailwindUI, REST API, Node.js, Express.js, Swagger, Postman, Google Analytics, SEO, GEO, Accessibility
  • State Management
    • Redux, Pinia, Vuex
  • CMS & E-Commerce
    • Shopware 6, Shopware PWA, Shopware Frontends, Twig, Wordpress, Contentful, Stripe,
  • Performance & Testing
    • Jest, Playwright, Cypress, Lighthouse
  • DevOps & Infrastructure
    • CI/CD, Git, GitLab, GitHub, Bitbucket, Azure, Azure DevOps, Jira, Figma, Adobe Design, VS Code, AWS (S3, CloudFront, IAM), Docker, Deployment, Monorepo, Turborepo, BDD, TDD, Atomic Design Pattern, Algorithms and Data Structures, Design Systems, Responsive Web Design, Clean Code, Micro- frontends, Microservices, AR, Performance, Business Metrics Focussed (i.e. Conversion Rates)

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

2 Jahre 8 Monate
2022-08 - heute

Agency development

Frontend Developer (freelance) React.js Next.js Nuxt.js ...
Frontend Developer (freelance)
A web agency implementing individual software solutions for large corporations
  • Developed large-scale applications for the healthcare, farming, and e-commerce sectors. Engineered complex UI solutions tailored to enhance user experience. Ensured robust cross-browser compatibility and optimised performance through intelligent automation. Delivered visually appealing, intuitive user interfaces, significantly boosting user engagement and satisfaction. Leveraged prompt engineering and AI-assisted development for smarter, adaptive interfaces. Due to the sensitive nature of these projects, specific details remain confidential.
React.js Next.js Nuxt.js Vue.js Redux Pinia Turborepo Node.js Express.js SCSS Stripe AWS Docker OpenAI
DEVParadise, Berlin (Germany)
Remote
7 Monate
2024-06 - 2024-12

Migration of a B2C e-commerce platform

Frontend Developer (freelance) Shopware 6 Twig PHP ...
Frontend Developer (freelance)
E-commerce digital agency creating sustainable, growth driven digital results
  • Successfully migrated a B2C e-commerce platform from Shopware 5 to Shopware 6, ensuring a smooth transition within a tight deadline. Boosted conversion rates by refining product detail pages and CMS modules for an outstanding user experience (UX). Developed custom plugins to enhance platform capabilities, optimizing performance and addressing specific business needs. Worked closely with crossfunctional teams to integrate new features seamlessly while maintaining high code quality and meeting project timelines.
Shopware 6 Twig PHP Symfony SCSS Bootstrap Docker SQL
Netformic GmbH, Stuttgart (Germany)
Remote
1 Jahr
2023-10 - 2024-09

Front-end redesign of the website

Web Developer (freelance) JS TS React.js ...
Web Developer (freelance)
  • Working for a client of (on request) - a nationwide award-winning green electricity and gas provider and the largest e-mobility provider in Germany
  • I spearheaded the frontend transformation of the company?s website and customer portal, aligning it with the new corporate design to deliver a modern, accessible, and user-centric experience. By optimising the UI/UX and ensuring full compliance with accessibility standards, I played a crucial role in increasing customer engagement and satisfaction, as reflected in feedback-driven performance metrics.
  • Post-relaunch, I continued to develop and optimise the customer portal, introducing new features and refining React.js applications within a monorepo architecture. Operating within an AWS-powered infrastructure, the platform maintained scalability, reliability, and high availability. Additionally, I played a key role in CI/CD pipeline integration, agile development workflows, and rigorous code reviews, ensuring efficient deployment cycles, maintainable codebases, and a high-performance frontend ecosystem. Alongside the ongoing development of new features and applications, I actively refactored code, implemented upgrades, and reduced technical debt to enhance maintainability, performance, and long-term scalability.
JS TS React.js Redux SCSS Vanilla Extract BEM Jest Playwright Turborepo AWS Contentful
auf Anfrage
Remote
8 Monate
2023-02 - 2023-09

Various projects for European clients

Web Developer (freelance) JS TS Vue.js ...
Web Developer (freelance)
A software development company, working on multiple projects for diverse European clients
  • Together, we launched three end-to-end online e-commerce stores and worked on a B2B SaaS investment platform for a German bank. With extensive experience, I have successfully executed visually appealing and userfriendly interfaces, core features (PDP, checkout, payment) and components. Additionally, I have conducted code reviews, devised test concepts, resolved bugs, implemented designs and proposed UI solutions.
  • I met a challenging deadline for the relaunch of a new shop, resulting in significant revenue growth. Moreover, I helped accomplish the development of an MVP within a span of 3 months, enabling the client to sustain their business and attracting a larger audience through improved SEO. Furthermore, I have developed a custom internal tool that significantly reduced UX research time from several days to just a few minutes after data upload. As well as created responsive and reusable web components for the company wide design system in the micro-frontend application.
JS TS Vue.js Nuxt.js Vue Composition API React.js Lit Shopware PWA Shopware Frontends Shopware 5 PHP Twig TailwindCSS Sass BEM Web Components Micro-frontends Cypress Jest Docker
Kleerly GmbH, Köln (Germany)
Remote
6 Monate
2022-03 - 2022-08

Various projects for European clients

Web Developer (freelance) JS TS Vue.js ...
Web Developer (freelance)
A software development company, working on multiple projects for diverse European clients
  • Together, we launched three end-to-end online e-commerce stores and worked on a B2B SaaS investment platform for a German bank. With extensive experience, I have successfully executed visually appealing and userfriendly interfaces, core features (PDP, checkout, payment) and components. Additionally, I have conducted code reviews, devised test concepts, resolved bugs, implemented designs and proposed UI solutions.
  • I met a challenging deadline for the relaunch of a new shop, resulting in significant revenue growth. Moreover, I helped accomplish the development of an MVP within a span of 3 months, enabling the client to sustain their business and attracting a larger audience through improved SEO. Furthermore, I have developed a custom internal tool that significantly reduced UX research time from several days to just a few minutes after data upload. As well as created responsive and reusable web components for the company wide design system in the micro-frontend application.
JS TS Vue.js Nuxt.js Vue Composition API React.js Lit Shopware PWA Shopware Frontends Shopware 5 PHP Twig TailwindCSS Sass BEM Web Components Micro-frontends Cypress Jest Docker
Kleerly GmbH, Köln (Germany)
Remote
8 Monate
2021-08 - 2022-03

Development and provision of robust applications

Web Developer (freelance) JavaScript React.js Next.js ...
Web Developer (freelance)
A software enterprise specialising in the development and deployment of robust applications for clients with extensive customer networks
  • I have successfully created a multistep assistant for planning and booking custom group tours, along with a user-facing booking configurator on a travel agency platform. Integrated the project into a large Aurelia.js ERP platform. In this role, I efficiently translated detailed requirements into wireframes and designed the application's architecture. 
  • Single-handedly developed the solution from scratch within a remarkable timeframe, 1 week before the planned date.
  • I empowered the client's employees to prepare custom tours for showcasing purposes three times faster, resulting in a significant 10% increase in sales. Additionally, I was responsible for designing the user experience (UX) and user interface (UI) of the booking assistant, ensuring a seamless and intuitive journey for users.
JavaScript React.js Next.js Redux Less and BEM Full Calendar library Google Maps Google Autocomplete API Node.js
SIO AG, Köln (Germany)
Remote
6 Monate
2021-03 - 2021-08

Global talent pool of freelancers

Frontend Developer (Full-time) JavaScript Nuxt.js Vuetify.js ...
Frontend Developer (Full-time)
A platform connecting businesses with a global talent pool of freelancers, facilitating the hiring and collaboration process for various projects and tasks
  • Contributed to numerous features within the job search platform, admin panel and client landing pages as a member of a 15-person Scrum team. In addition, I took the lead in creating comprehensive UI guidelines that served as valuable references for frontend developers, designers, and QA professionals. I played a crucial role in the development and deployment of the API Factory, a pivotal component which improved code cleanliness and facilitated seamless integration of new features into the system.
JavaScript Nuxt.js Vuetify.js Vuex SASS
Twago, Berlin (Germany)
Remote
8 Monate
2020-07 - 2021-02

Stock market community platform

Frontend Developer (Full-time) JavaScript React.js React Native ...
Frontend Developer (Full-time)
Stock market community platform specialising in financial news and market analysis, providing valuable insights and information to investors and traders
  • I developed essential features for both the desktop and mobile versions of a chat application. Implemented an interactive product tour customised for new users, optimising their onboarding experience within the chat platform. Additionally, by introducing new features and pages to the live website, I successfully expanded the user base and subscriber count, enhancing engagement and driving significant growth.
JavaScript React.js React Native MobX Node.js WordPress PHP SEO Styled Components
Bull Markets Media, Berlin (Germany)
Onsite/ Remote
6 Monate
2019-11 - 2020-04

Individual health needs

Frontend Developer JavaScript React React Hooks ...
Frontend Developer
Company that offers personalised supplement plans and delivers custom- formulated nutrient packs based on individual health needs and goals.
JavaScript React React Hooks Redux Node.js GraphQL Styled Components Semantic UI
Baze Labs GmbH, Berlin (Germany)
6 Monate
2019-05 - 2019-10

Car Dealer Homepage

Frontend Developer (Part-time) JavaScript React.js Next.js ...
Frontend Developer (Part-time)
An automotive dealership, specialising in providing exceptional luxury and performance vehicles to discerning customers. Page has 30K visitors weekly.
JavaScript React.js Next.js Redux Sass REST API.
Berlin (Germany)

Aus- und Weiterbildung

Aus- und Weiterbildung

1 Jahr
2019-01 - 2019-12

Web Development Bootcamp

ReDi School of Digital Integration, Berlin (Germany)
ReDi School of Digital Integration, Berlin (Germany)
Javascript and React.js course - Learning advanced JavaScript and React by working on a real challenge provided by IDMC
2 Jahre 9 Monate
2016-09 - 2019-05

Study - English Philology/ Translation

Bachelor of Arts, Adam Mickiewicz University, Poznan (Poland)
Bachelor of Arts
Adam Mickiewicz University, Poznan (Poland)

Position

Position

SENIOR FRONTEND DEVELOPER

Kompetenzen

Kompetenzen

Top-Skills

TypeScript React Vue.js CSS3 JavaScript PHP HTML REST Jest Playwright Cypress Git Node.js Shopware Symfony lit GraphQL Docker AWS

Produkte / Standards / Erfahrungen / Methoden

Profile
Senior Frontend Developer - Scalable & High-Performance Web Applications. As a results-driven Frontend Developer, I specialise in React.js, Vue.js, TypeScript and e-commerce platforms like Shopware, delivering high-performance, user-centric applications. With 5+ years of experience across startups, mid-sized businesses, and large enterprises, I have successfully collaborated with diverse teams in agile environments. I optimise UX, boost conversion rates, and enhance frontend architecture, thriving in fast-paced, crossfunctional teams to drive business success. 

Skills and tools
  • Frontend
    • React.js, Vue.js, Next.js, Nuxt.js, JavaScript, TypeScript, GraphQL, Lit, React Native, PHP, Node.js, HTML, CSS, SCSS, SASS, LESS, Media Queries, Container Queries, BEM, TailwindUI, REST API, Node.js, Express.js, Swagger, Postman, Google Analytics, SEO, GEO, Accessibility
  • State Management
    • Redux, Pinia, Vuex
  • CMS & E-Commerce
    • Shopware 6, Shopware PWA, Shopware Frontends, Twig, Wordpress, Contentful, Stripe,
  • Performance & Testing
    • Jest, Playwright, Cypress, Lighthouse
  • DevOps & Infrastructure
    • CI/CD, Git, GitLab, GitHub, Bitbucket, Azure, Azure DevOps, Jira, Figma, Adobe Design, VS Code, AWS (S3, CloudFront, IAM), Docker, Deployment, Monorepo, Turborepo, BDD, TDD, Atomic Design Pattern, Algorithms and Data Structures, Design Systems, Responsive Web Design, Clean Code, Micro- frontends, Microservices, AR, Performance, Business Metrics Focussed (i.e. Conversion Rates)

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

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