03/06/2026 updated

**** ******** ****
100 % available

Senior Frontend React Developer & Architect

Budakeszi, Hungary
Only remote
BSc, Informatics Engineer
Budakeszi, Hungary
Only remote
BSc, Informatics Engineer

Profile attachments

Aron_Harsfalvi_CV.docx

About me

Senior React / Next.js engineer with 20+ years experience. I help teams build scalable web applications, integrate APIs and improve performance and reliability of production systems. Strong engineering mindset with focus on maintainable architecture and quality.

JavaScriptApplication Programming Interfaces (APIs)ArchitectureCascading Style Sheets (CSS)Web DesignPython (Programming Language)Node.jsPerformance TuningSystems IntegrationTypeScriptWeb ApplicationsReact.jsBackendBackend ProgrammingAngularJSGraphQLFront End Software DevelopmentApi Design
React Development
Extensive experience in building scalable web applications using React with over 6 years of hands-on development, including modern frontend architectures and server-side rendering

Angular Development
Proficient in Angular framework with 4 years of experience developing complex frontend systems, including migration projects and performance optimization

Frontend Architecture
Strong expertise in designing and implementing modular frontend architectures, integrating REST and GraphQL APIs, and delivering production-ready solutions

JavaScript Development
Advanced JavaScript skills with 8 years of experience in modern ES6+ features and frontend development patterns

Node.js Backend
Backend development experience with Node.js for 2-3 years, including API development and server-side applications

CSS Styling
Comprehensive CSS knowledge for creating responsive and modern user interfaces

Web Design
Design skills for creating user-friendly and visually appealing web applications

Python Programming
Backend programming experience with Python for various development projects

TypeScript
Strong TypeScript skills for type-safe frontend and backend development

GraphQL
Experience with GraphQL for efficient API development and data querying

Languages

EnglishFluentHungarianNative speaker

Project history

Tech Lead (perm.)

Pepperston
Leading the design and delivery of large-scale, customer-facing web applications built with React and TypeScript, using Next.js and Contentstack as headless CMS. Responsible for technical leadership on the frontend, including architectural decisions, code quality standards, and guiding the team through complex implementations.

Frontend Architect (Contract)

Sensirion
Developed and maintained a cutting-edge IoT platform for monitoring and analyzing methane leakage data. Implemented real-time alerting and interactive dashboards using Angular, with plans to migrate to React for enhanced flexibility and maintainability.

Lead Frontend Developer (Contract)

Avon
Spearheaded the development of a critical internal application for streamlining brochure management and sales information handling. Led comprehensive redesign using Angular with AI-driven insights for sales trend prediction and data accuracy.

Senior Frontend Developer (Contract)

Shell Recharge
Enhanced the settlement segment of the charging process administration through comprehensive overhauls, transitioning from legacy pages to modern, user-friendly interfaces using React and GraphQL.

Senior Frontend Developer (Contract)

GE Healthcare
Analyzed and solved complex problems within current projects using React, Angular, and Python. Provided consultation to junior colleagues and contributed to user story development for project alignment.

Senior Frontend Developer (Contract)

Flexion Mobile
Upgraded legacy AngularJS frontend to latest React version while enhancing configuration. Collaborated with backend team for seamless integration and improved React configuration for efficient deployment.

Senior Frontend Developer (Contract)

Raiffeisen Bank
Improved and developed new features for company's Frontend applications using Angular and React. Worked on risk calculation for debt deals and stock action processing, focusing on Frontend development and performance optimization.

Senior Frontend Developer (Contract)

Smatrics GmbH
Developed charging management system for electric vehicle charging processes using Angular and React. Built responsive and user-friendly Frontend interface and implemented missing protocol items and new backend features.

Senior backend and React Developer (Contract)

MSCI Hungary Kft
Developed features and applications for creating indexes and benchmark tools for the stock market using React, Spring Boot, and Websockets. Focused on reducing time-to-market for new index products.

Senior Frontend Developer (Contract)

Aliz (aka Doctusoft)
Involved in banking project for organizing large scale investments using Angular. Played key role in creating the frontend application covering all functionalities and ensuring optimal user experience.

Web Solution Architect

Avon Cosmetics Hungary Kft
Worked with business partners in Central and Eastern Europe to assess feasibility and map requirements to high-performance web solutions. Created modern, responsive, mobile-friendly user experiences using REST APIs and React.

Senior Fullstack Developer

Kainos Software Ltd
Worked on government projects including agricultural application for Department for Environment Food & Rural Affairs and online form application for Foreign & Commonwealth Office using AngularJS, React, NodeJS, and Scala.

Senior Software Developer (Contract)

Headspace
Built REST web service APIs for online meditation portal with 50,000+ daily users. Integrated third-party e-commerce tools and payment gateways, introducing payment, mailing, and subscription engines.

Software Developer

Walt Disney Hungary Kft
Developed and supported Disney international registration and login system. Built large-scale web application with several components for registration system, favorites, and other functionalities integrated with Disney online applications.

Software Developer

AdNovum Hungary Kft
Developed and maintained internal web applications for UBS Bank including smaller features, defect fixes, and participation in internal projects such as time tracking tools and booking systems.

Junior Software Developer

Tata Consultancy Services (TCS)
Developed and maintained backend web applications for GE, creating screens for building rental process management and developing helper tools. Participated in projects for GE Money with feature development and integration tasks.

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