A dedicated, highly creative and conscientious Senior Frontend Engineer with experience in building scalable and accessible web applications.
Aktualisiert am 10.06.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 08.06.2026
Verfügbar zu: 100%
davon vor Ort: 100%
React
TypeScript
Front-End
HTML5
HTML
CSS3
CSS
Playwright
Jest
TailwindCSS
Redis
Scrum
Kanban
AWS
Azure
Git
gitlab
GitLab
Figma
JSON
REST
GitHub
JavaScript

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

3 years
2023-07 - now

Designed and implemented scalable UI components

Freelance Contractor, Contract Senior Frontend Developer React.js Shadcn UI Tailwind CSS ...
Freelance Contractor, Contract Senior Frontend Developer
  • Pioneered the evolution of a telemedicine platform's frontend, enhancing core features and optimizing user experience flows across critical modules.
  • Designed and implemented scalable UI components and engaging digital user journeys using React, Next.js, and Tailwind CSS, improving platform usability.
  • Automated and refined manual landing page deployment processes, resulting in a measurable increase in efficiency and faster campaign turnaround times.
  • Developed a Chrome extension that uses AI to summarize YouTube videos and Shorts, enhancing user experience by providing concise, relevant insights. 
  • Other completed projects without NDA can be seen below.
React.js Shadcn UI Tailwind CSS Vite.js Zod TypeScript/JavaScript ChatGPT (OpenAI)
4 months
2025-06 - 2025-09

Integration of new features

Contract Senior Frontend Developer
Contract Senior Frontend Developer
  • Collaborated closely with backend and design teams to ensure seamless integration of new features, maintaining a cohesive and performant application architecture.
  • Provided key technical insights for the frontend roadmap, driving the adoption of modern development practices and ensuring future scalability of the codebase.
Cognizant American IT Consulting
7 months
2024-06 - 2024-12

Front-end development of the science research platform

Contract Senior Frontend Developer
Contract Senior Frontend Developer
  • Orchestrated the deployment of high-performance frontend applications to cloud environments (e.g., Supabase), ensuring stability and accessibility for end-users.
  • Led front-end development of the science research platform and managed the full project lifecycle. Established documentation standards for architecture decisions and developer onboarding.
  • Delivered the product using TypeScript, JavaScript, TypeScript/JavaScript, and Vite.js. The company partnered with ResearchGate, which has 25M+ researchers.
  • Implemented reusable components by translating the Figma design system and collaborating with designers and key stakeholders.
  • Created automated E2E tests using Playwright to ensure application reliability and maintainability.
  • Experience with TDD (Test-Driven Development), accessibility, cross-browser compatibility, Azure, participate in code reviews.
Extrica
Remote
4 months
2023-09 - 2023-12

Ensured codebase quality

Contract Senior Frontend Developer
Contract Senior Frontend Developer

  • Ensured codebase quality, maintainability, and optimal performance through systematic code reviews, implementation of best practices, and effective use of GitHub-based workflows.
  • Developed gaming DApp using Web3.js, Ethereum.js, React.js, Typescript/JavaScript, LottieFiles, and Node.js/Express. js. DApp contributed to the Saakaru blockchain reaching 1M monthly transactions.
  • Mentored developers on front-end development best practices and led documentation initiatives.
  • Rearchitected React.js application to improve scalability, performance, and maintainability.
  • Shaped Web3 product vision by aligning customer needs and market solutions.
  • Developed reusable components from the Figma design system using TypeScript/JavaScript and React.js.
  • Reduced CI/CD pipeline build times by 50% through strategic optimizations, thereby enhancing the team?s productivity.
  • Implemented automated performance regression detection in CI/CD pipelines.
  • Experience with NoSQL databases, event-driven architecture, Node.js, Next.js, and RESTful APIs, participate in code reviews.

Saakuru, Startup
Remote
1 year 5 months
2022-03 - 2023-07

Feature development

Frontend Developer
Frontend Developer

  • Collaborated cross-functionally with design, backend teams, and key stakeholders on feature development.
  • Developed a large-scale B2C front-end e-commerce application using React.js and TypeScript/JavaScript that supported 30M+ requests a month.
  • Built and maintained reusable React.js components and Storybook documentation for the internal component library, collaborating with UI/UX designers.
  • Reduced AWS infrastructure costs by 50% through React.js and TypeScript/JavaScript codebase refactoring, optimizing cloud node usage.
  • Collaborated with the SEO team to resolve URL cannibalization in the React.js application, resulting in a $1.5M revenue increase.
  • Utilized monitoring tools for performance insights and error detection.
  • Added an automated CI/CD pipeline process to streamline team workflow.
  • Experience with AWS, Lambda, Serverless, Kubernetes, Datadog, NoSQL, SQL databases, and RESTful APIs, participate in code reviews.

AboutYou
Remote
1 year 2 months
2021-02 - 2022-03

BDD testing strategy for the application

Frontend Developer
Frontend Developer
  • Developed reusable components using Vue.js, Typescript/Javascript, and Vite.js.
  • Collaborated with stakeholders to define and deliver new features.
  • Utilized a BDD testing strategy for the application, which tests could be reviewed and confirmed by nontechnical stakeholders. Gave a talk about BDD testing strategy and success in the project.
FrontIT
Remote
1 year 5 months
2019-10 - 2021-02

Maintained e-commerce application

Frontend Developer React.js TypeScript/ JavaScript
Frontend Developer
  • Designed architecture and implemented fleet telematics and a real-time analytics platform using React.js and TypeScript/JavaScript.
React.js TypeScript/ JavaScript
Rinkodara
6 years 2 months
2013-09 - 2019-10

Architectural design and development

Software Engineer, Self-employed TypeScript JavaScript and web platforms using PHP jQuery ...
Software Engineer, Self-employed
  • Led architectural design and development of event-driven, high-performance project 
  • Established technical roadmap and release strategies, managing the full project lifecycle.
  • Implemented a secure authentication system and payment gateway integration for premium features.
TypeScript JavaScript and web platforms using PHP jQuery MySQL and Java

Aus- und Weiterbildung

Aus- und Weiterbildung

Computer Science

Bachelor's degree

Kaunas University of Technology


Key Focus:

Relevant courses: Design Patterns, Data Structures and Algorithms


Computer Science, Erasmus+ Studies abroad

Bachelor's degree

University of Ioannina


Certificate

Laravel Certificate

Kompetenzen

Kompetenzen

Top-Skills

React TypeScript Front-End HTML5 HTML CSS3 CSS Playwright Jest TailwindCSS Redis Scrum Kanban AWS Azure Git gitlab GitLab Figma JSON REST GitHub JavaScript

Produkte / Standards / Erfahrungen / Methoden

SUMMARY & RECOMMENDATIONS

  • A dedicated, highly creative and conscientious Senior Frontend Developer with experience in building scalable and accessible web applications. Proficient in development with React, Next.js, Node.js, PostgreSQL, TypeScript, JavaScript and its ecosystem for international companies ranging from startups to large enterprises. Enjoys the challenges and working on own initiative, excellent team player with experience in leadership and personal and professional development. Exceptional communication skills with great attention to detail. 
  • A talented developer with a product engineer mindset who thinks beyond code to deliver product value.
  • The Freelancer has a great ability to make complex problems feel seamless.
  • Impressed by his attention to technical detail and continuing passion to improve his skills and learn new ones.


SKILLS

Top hard skills:

Supabase, digital user journeys, GitHub-based development processes, scalable frontend structures, AI-supported structures, landing pages, modern tech workflows, frontend performance.


Top soft skills:

Collaboration, Strategic thinking, Adaptability, Design understanding.


JavaScript stack:

  • React.js
  • Next.JS
  • Node.JS
  • styled components,
  • Redux
  • Cypress
  • Playwright
  • JEST
  • Storybook
  • Webpack
  • Vite
  • Express
  • npm
  • Babel
  • React Router
  • React Testing Library
  • State Management (Context API)
  • Tailwind CSS
  • Material UI
  • TanStack Query
  • Large language models (LLMs)


Methodologies:

  • Agile
  • Scrum
  • Kanban


Cloud:

  • AWS
  • Azure
  • Vercel


Other:

  • Leadership
  • Git
  • Gitlab CI
  • Jira
  • GitHub
  • Bitbucket
  • Datadog
  • Figma
  • GitHub Actions
  • Apollo GraphQL
  • tRPC
  • gRPC
  • Docker
  • REST APIs
  • JSON
  • Sass/Less
  • SCSS
  • User Experience (UX)

Programmiersprachen

JavaScript
ES6/ES7
TypeScript
HTML5
CSS3

Datenbanken

Redis
Elasticsearch
MySQL
PostgreSQL

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

3 years
2023-07 - now

Designed and implemented scalable UI components

Freelance Contractor, Contract Senior Frontend Developer React.js Shadcn UI Tailwind CSS ...
Freelance Contractor, Contract Senior Frontend Developer
  • Pioneered the evolution of a telemedicine platform's frontend, enhancing core features and optimizing user experience flows across critical modules.
  • Designed and implemented scalable UI components and engaging digital user journeys using React, Next.js, and Tailwind CSS, improving platform usability.
  • Automated and refined manual landing page deployment processes, resulting in a measurable increase in efficiency and faster campaign turnaround times.
  • Developed a Chrome extension that uses AI to summarize YouTube videos and Shorts, enhancing user experience by providing concise, relevant insights. 
  • Other completed projects without NDA can be seen below.
React.js Shadcn UI Tailwind CSS Vite.js Zod TypeScript/JavaScript ChatGPT (OpenAI)
4 months
2025-06 - 2025-09

Integration of new features

Contract Senior Frontend Developer
Contract Senior Frontend Developer
  • Collaborated closely with backend and design teams to ensure seamless integration of new features, maintaining a cohesive and performant application architecture.
  • Provided key technical insights for the frontend roadmap, driving the adoption of modern development practices and ensuring future scalability of the codebase.
Cognizant American IT Consulting
7 months
2024-06 - 2024-12

Front-end development of the science research platform

Contract Senior Frontend Developer
Contract Senior Frontend Developer
  • Orchestrated the deployment of high-performance frontend applications to cloud environments (e.g., Supabase), ensuring stability and accessibility for end-users.
  • Led front-end development of the science research platform and managed the full project lifecycle. Established documentation standards for architecture decisions and developer onboarding.
  • Delivered the product using TypeScript, JavaScript, TypeScript/JavaScript, and Vite.js. The company partnered with ResearchGate, which has 25M+ researchers.
  • Implemented reusable components by translating the Figma design system and collaborating with designers and key stakeholders.
  • Created automated E2E tests using Playwright to ensure application reliability and maintainability.
  • Experience with TDD (Test-Driven Development), accessibility, cross-browser compatibility, Azure, participate in code reviews.
Extrica
Remote
4 months
2023-09 - 2023-12

Ensured codebase quality

Contract Senior Frontend Developer
Contract Senior Frontend Developer

  • Ensured codebase quality, maintainability, and optimal performance through systematic code reviews, implementation of best practices, and effective use of GitHub-based workflows.
  • Developed gaming DApp using Web3.js, Ethereum.js, React.js, Typescript/JavaScript, LottieFiles, and Node.js/Express. js. DApp contributed to the Saakaru blockchain reaching 1M monthly transactions.
  • Mentored developers on front-end development best practices and led documentation initiatives.
  • Rearchitected React.js application to improve scalability, performance, and maintainability.
  • Shaped Web3 product vision by aligning customer needs and market solutions.
  • Developed reusable components from the Figma design system using TypeScript/JavaScript and React.js.
  • Reduced CI/CD pipeline build times by 50% through strategic optimizations, thereby enhancing the team?s productivity.
  • Implemented automated performance regression detection in CI/CD pipelines.
  • Experience with NoSQL databases, event-driven architecture, Node.js, Next.js, and RESTful APIs, participate in code reviews.

Saakuru, Startup
Remote
1 year 5 months
2022-03 - 2023-07

Feature development

Frontend Developer
Frontend Developer

  • Collaborated cross-functionally with design, backend teams, and key stakeholders on feature development.
  • Developed a large-scale B2C front-end e-commerce application using React.js and TypeScript/JavaScript that supported 30M+ requests a month.
  • Built and maintained reusable React.js components and Storybook documentation for the internal component library, collaborating with UI/UX designers.
  • Reduced AWS infrastructure costs by 50% through React.js and TypeScript/JavaScript codebase refactoring, optimizing cloud node usage.
  • Collaborated with the SEO team to resolve URL cannibalization in the React.js application, resulting in a $1.5M revenue increase.
  • Utilized monitoring tools for performance insights and error detection.
  • Added an automated CI/CD pipeline process to streamline team workflow.
  • Experience with AWS, Lambda, Serverless, Kubernetes, Datadog, NoSQL, SQL databases, and RESTful APIs, participate in code reviews.

AboutYou
Remote
1 year 2 months
2021-02 - 2022-03

BDD testing strategy for the application

Frontend Developer
Frontend Developer
  • Developed reusable components using Vue.js, Typescript/Javascript, and Vite.js.
  • Collaborated with stakeholders to define and deliver new features.
  • Utilized a BDD testing strategy for the application, which tests could be reviewed and confirmed by nontechnical stakeholders. Gave a talk about BDD testing strategy and success in the project.
FrontIT
Remote
1 year 5 months
2019-10 - 2021-02

Maintained e-commerce application

Frontend Developer React.js TypeScript/ JavaScript
Frontend Developer
  • Designed architecture and implemented fleet telematics and a real-time analytics platform using React.js and TypeScript/JavaScript.
React.js TypeScript/ JavaScript
Rinkodara
6 years 2 months
2013-09 - 2019-10

Architectural design and development

Software Engineer, Self-employed TypeScript JavaScript and web platforms using PHP jQuery ...
Software Engineer, Self-employed
  • Led architectural design and development of event-driven, high-performance project 
  • Established technical roadmap and release strategies, managing the full project lifecycle.
  • Implemented a secure authentication system and payment gateway integration for premium features.
TypeScript JavaScript and web platforms using PHP jQuery MySQL and Java

Aus- und Weiterbildung

Aus- und Weiterbildung

Computer Science

Bachelor's degree

Kaunas University of Technology


Key Focus:

Relevant courses: Design Patterns, Data Structures and Algorithms


Computer Science, Erasmus+ Studies abroad

Bachelor's degree

University of Ioannina


Certificate

Laravel Certificate

Kompetenzen

Kompetenzen

Top-Skills

React TypeScript Front-End HTML5 HTML CSS3 CSS Playwright Jest TailwindCSS Redis Scrum Kanban AWS Azure Git gitlab GitLab Figma JSON REST GitHub JavaScript

Produkte / Standards / Erfahrungen / Methoden

SUMMARY & RECOMMENDATIONS

  • A dedicated, highly creative and conscientious Senior Frontend Developer with experience in building scalable and accessible web applications. Proficient in development with React, Next.js, Node.js, PostgreSQL, TypeScript, JavaScript and its ecosystem for international companies ranging from startups to large enterprises. Enjoys the challenges and working on own initiative, excellent team player with experience in leadership and personal and professional development. Exceptional communication skills with great attention to detail. 
  • A talented developer with a product engineer mindset who thinks beyond code to deliver product value.
  • The Freelancer has a great ability to make complex problems feel seamless.
  • Impressed by his attention to technical detail and continuing passion to improve his skills and learn new ones.


SKILLS

Top hard skills:

Supabase, digital user journeys, GitHub-based development processes, scalable frontend structures, AI-supported structures, landing pages, modern tech workflows, frontend performance.


Top soft skills:

Collaboration, Strategic thinking, Adaptability, Design understanding.


JavaScript stack:

  • React.js
  • Next.JS
  • Node.JS
  • styled components,
  • Redux
  • Cypress
  • Playwright
  • JEST
  • Storybook
  • Webpack
  • Vite
  • Express
  • npm
  • Babel
  • React Router
  • React Testing Library
  • State Management (Context API)
  • Tailwind CSS
  • Material UI
  • TanStack Query
  • Large language models (LLMs)


Methodologies:

  • Agile
  • Scrum
  • Kanban


Cloud:

  • AWS
  • Azure
  • Vercel


Other:

  • Leadership
  • Git
  • Gitlab CI
  • Jira
  • GitHub
  • Bitbucket
  • Datadog
  • Figma
  • GitHub Actions
  • Apollo GraphQL
  • tRPC
  • gRPC
  • Docker
  • REST APIs
  • JSON
  • Sass/Less
  • SCSS
  • User Experience (UX)

Programmiersprachen

JavaScript
ES6/ES7
TypeScript
HTML5
CSS3

Datenbanken

Redis
Elasticsearch
MySQL
PostgreSQL

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Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

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

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