# Yonatan Ayalon - Professional Profile
## Summary
Seasoned Senior Front-End Engineer with over 15 years of experience architecting
high-performance, scalable web applications and micro frontend systems. Proven
track record of designing robust UI architectures, implementing enterprise-scale
design systems, and driving measurable improvements in performance,
accessibility, and user experience.
Expert in React, TypeScript, and modern frontend frameworks, with deep
experience in design systems, component library development, experimentation
platforms, and A/B testing infrastructure. Proven track record of implementing
scalable, accessible solutions that improve user engagement and accelerate
development velocity across engineering teams.
Passionate about building scalable frontend infrastructure, translating complex
system requirements into elegant user experiences, and leading cross-functional
teams to deliver high-quality web applications.
## Current Role
**Senior Software Engineer at Vimeo** (July 2020 - Present)
- Architecting React + TypeScript + Redux applications serving millions of users
- Led 40% load time improvement through comprehensive performance optimization
- Designed and implemented micro frontend architecture for team scalability
- Built E2E testing infrastructure with Selenium, WebDriverIO, and BrowserStack
- Led design system implementation across multiple product teams
- Drove A/B testing and conversion optimization initiatives
- Developed Python scripts for data processing and backend automation tasks
## Technical Expertise
### Frontend Development (15+ years)
- **React & TypeScript**: Expert level with 8+ years building enterprise-scale
applications
- **Performance**: Bundle optimization, code splitting, lazy loading achieving
90+ Lighthouse scores
- **Architecture**: Micro frontends, component libraries, scalable design
systems
- **State Management**: Redux, Redux Toolkit (RTK), Context API, Zustand
- **CSS & Styling**: Styled-components, Emotion, Tailwind CSS, SASS/SCSS
- **Build Tools**: Webpack, Vite, Create React App, Next.js
- **Testing**: Jest, React Testing Library, Playwright, Cucumber, Karma, Jasmine
- **Legacy Technologies**: jQuery, Flash CMS, Photoshop, Freehand
- **Modern Stack**: Next.js, Webpack optimization, PWAs with offline
functionality
### Architecture & Leadership
- **System Design**: Microservices, event-driven architecture, CQRS patterns
- **Performance Optimization**: Code splitting, lazy loading, caching strategies
- **Team Leadership**: Mentored 5+ junior developers, led code reviews
- **Agile Methodologies**: Scrum, Kanban, CI/CD implementation
- **A/B Testing**: Led experimentation platforms with measurable ROI
improvements
- **Cross-functional**: Product, design, and backend team collaboration
### Backend Development
- **Node.js**: 5+ years building REST APIs, GraphQL APIs, and microservices
- **Python**: Data processing, automation scripts, backend tooling
- **.NET Framework**: MVC4/5, WebAPI development and deployment
- **PHP**: Server-side development, MySQL integration, portal systems
- **Ruby on Rails**: Full-stack web application development
- **Database**: MySQL, MSSQL, PostgreSQL, MongoDB, Redis
- **Cloud & DevOps**: AWS (EC2, Lambda, S3, RDS), Docker, CDN optimization
- **API Development**: RESTful services, GraphQL, tRPC, WebSocket
implementations
- **Real-time**: WebSocket implementations, live data systems
### Security & Best Practices
- **Security**: XSS Prevention, CSRF Protection, Content Security Policy (CSP)
- **Authentication**: OAuth & JWT, HTTP-Only Cookies, Input Sanitization
- **Standards**: Secure Coding Practices, OWASP Guidelines, Accessibility (WCAG)
## Key Achievements
### Vimeo Performance Optimization (2020-Present)
- Achieved 40% load time improvement through comprehensive optimization strategy
- Built performance monitoring and logging systems with real-time alerting
- Implemented micro frontend architecture enabling independent team deployments
- **Technologies**: React, TypeScript, Redux, AWS, Performance APIs
### FinTech Application Leadership (2019-2020) - Credifi
- Sole front-end developer responsible for UX/UI of flagship FinTech customer
application
- Refactored and maintained Angular (v1 and v2+) applications in TypeScript,
significantly improving performance
- Directed UI/UX strategy and ensured design system consistency across views
- **Technologies**: Angular, TypeScript, FinTech analytics, commercial real
estate
### Electronics Analytics Platform - Tech Lead (2015-2017)
- Spearheaded Angular 2 + TypeScript migration as early adopter, leading
cutting-edge frontend technology implementation
- Tech Lead for composite component architecture designed to present live wafer
chip analytics in real-time UI
- Architected modular component system for complex electronics data
visualization and monitoring
- Led team in implementing modern JavaScript best practices and unit testing
frameworks
- **Technologies**: Angular 2, TypeScript, Composite Components, Electronics
Analytics, Real-time Data
### High-Scale Web Applications (2011-2015) - Perion
- Technical leadership for SearchApps team developing multiple high-scale web
applications
- Created web UIs and browser extensions for millions of daily users
- Implemented A/B testing frameworks that significantly improved conversion
rates and user engagement
- Delivered internal frontend training courses on MVC4, JavaScript best
practices, and scalable design patterns
- **Technologies**: .NET MVC4/5, WebAPI, MySQL/MSSQL, JavaScript, Browser
Extensions, CDN optimization
## Professional Experience Timeline
- **2020-Present**: Senior Software Engineer at Vimeo
- **2019-2020**: Senior Frontend Developer at Credifi
- **2017-2018**: Front-End Team Lead at Herolo
- **2015-2017**: Senior Developer & Scrum Master at Optimal+
- **2011-2015**: Senior Developer at Perion/Conduit (SearchApps team)
- **2010-2011**: Front-End Developer at Convertonet
- **2007-2010**: Full-Stack Developer at Walla! (Major Israeli Web Portal)
- **2006-2007**: Web Developer at Excelang (Ruby on Rails startup)
## Professional Strengths
- **Fast Learner**: Quick to adapt to new technologies and business domains
- **Problem Solver**: Strong analytical skills for complex technical challenges
- **Team Player**: Excellent communication and collaboration skills
- **Quality Focus**: Strong advocate for code quality, testing, and
documentation
- **User-Centric**: Deep understanding of UX principles and performance
optimization
## Core Competencies
- **Leadership**: Strong Team Player, High Integrity & Work Ethic, Mentorship
Skills
- **Technical**: Fast Learner, Hands-on Mindset, User Experience Advocate
- **Communication**: Excellent Communication, Continuous Learning,
Cross-functional Collaboration
## Languages
- English: Native
- Hebrew: Native
