React Day Berlin

Kitze loves to rant about webdev. He is the founder Sizzy - the browser for developers. He created React Academy to teach web development. He's the creator of Zero To Shipped - the interactive video course for mastering Fullstack Development. He's documenting his journey on YouTube, steams on Twitch and has a blog that he maintains one in a blue moon. He made Benji, Twizzy, ok-google.io, JSUI, Glink, showGPT and etc.

Software Engineer in the React Native team @ Meta

David is the founder of Stately.ai and creator of XState, the most popular open-source state machine & statecharts library. He's a longtime advocate for event-driven modeling and visual diagramming as the foundation for reliable UIs and, increasingly, AI agents. When he's not at a computer keyboard, he's at a piano keyboard.

Author of the "Fluent React" bestselling book, software engineer with 23 years of experience, and host of the developer-loved ConTejas Code podcast.

Fadila Fidina is a Senior Software Engineer at Atlassian, specialising in frontend engineering and delivering customer impact through experimentation. She’s passionate about crafting delightful user experiences and deeply values collaboration and people. When not at the keyboard, Fadila bakes, paints, and photographs — exploring the creative side of life in all its forms.

Senior React Native & AI Engineer at Callstack, researcher in AI & robotics, PhD candidate, aficionado of tech, pointillist paintings lover.

Maurice de Beijer is an independent software consultant and trainer. He specializes in TypeScript, ECMAScript, React and Svelte. His work includes popular collaboration software as well as a large, global, safety application for the oil and gas industry. He has a preference for working with startups and smaller, more dynamic companies. Maurice is also active in the open source community. He teaches ECMAScript, TypeScript, React, Cypress, Playwright and RxJS courses. Since 2005, he has received Microsoft’s Yearly Most Valuable Professional Award. Further, Maurice is active in the Dutch dotNed user group and helps organize its meetings.

Brad Westfall has been teaching Web Development since 2010 including bootcamp instruction, online videos, conference speaking, writing at CSS-Tricks.com, and corporate training for ReactTraining.com. He loves to connect with students by helping them achieve their technical goals and by distilling complex concepts into simple instruction.

Highly specialized in FE development space in silicon valley, worked on many big tech companies including Google, Deepmind, Meta, Tiktok, Linkedin etc.

Sam Abaasi is a Staff Frontend Engineer and squad lead at MTN Irancell, where he architected a Camunda‑based workflow platform replacing a legacy Huawei system. He owns the full frontend platform – React, TypeScript, BPMN/DMN tooling. He is the author of three in‑depth technical series: “How JavaScript Works” (10 parts), “How React Works” (9 parts, source‑verified), and the definitive 23‑part guide to the bpmn‑io form‑js module system.

Frontend Engineer at Netflix, where he builds internal products that support the lifecycle of movies and TV series - from planning and production to launch and promotion. With 7 years of experience in software engineering and a background in aerospace engineering, he is passionate about developer productivity, product-minded engineering, and practical applications of GenAI.

Louëlla Creemers is a software developer from the Netherlands focusing on .NET, C#, and modern web technologies. She is active in the developer community as a teacher, content creator, blogger, and public speaker, with a focus on making advanced or new topics accessible to developers at all stages of their careers. Online, she enjoys sharing educational content and the occasional joke with an audience of over 30,000 developers. Through her community involvement, Louëlla was awarded the Microsoft MVP title in 2023 in the Developer Technologies category. She is also a board member of the .NET Foundation and a mentor for her local CoderDojo.

Google Developer Expert in Web Technologies

Barcelona-based engineer with a Political Science background and a lifelong passion for automation. 13+ years in the game. I started by founding a remote startup, then moved through teams of every size. I thrive on complex problems. I ship at the highest standard and build for growth. AI is a multiplier in my toolkit, not a crutch. I give back through open source, conferences, and mentoring. Knowing when to move fast and when to get it right is the skill behind every other skill. Great software lives at the intersection of ambition and pragmatism.

**Dennis Nerush** is the Director of AI at Elementor, where he leads the company's AI strategy and guides teams through the integration of GenAI technologies that enhance productivity while preserving human creativity and accountability. With over 15 years of experience as a developer, manager, director, and adviser across multiple tech companies and startups, Dennis has dedicated his career to building people-first cultures rooted in continuous learning, curiosity, and growth. He believes that when individuals thrive, teams and businesses flourish, a philosophy that has guided him in founding dozens of teams and mentoring over 100 managers. Dennis is a seasoned public speaker and writer who shares his insights on AI integration, leadership, and team performance at international conferences. He's passionate about helping leaders develop the skills and confidence to excel in a world where human leadership and AI collaboration go hand in hand. In his free time, Dennis loves cooking and spending time with his kids. His main goal is to help people reach the next level.

Senior Web Developer & Engineering Manager based in Berlin with over 12 years of hands-on experience. I’m passionate about teaching and sharing knowledge – producing video tutorials and leading code courses at top programming schools. In my free time, I give back to the open-source community by maintaining projects like redux-offline, dracula-ui and clipboard.js,

Neciu Dan is a seasoned engineering leader with 15+ years of experience in the tech industry. He currently leads Perk Events as Engineering Manager and Staff Engineer, managing the team while staying hands-on in the codebase. Before Perk, he was Tech Lead at Rover, where he launched a multi-tier system across the US and Canada. Before that, he served as technical co-founder and Staff Engineer at CareerOS, where he spearheaded development, maintenance, and scaling of the main application, and held senior engineering roles at the New York e-commerce brand AdoreMe and the food delivery company Glovo. Today, Dan hosts the popular Señors at Scale podcast, organizes ReactJS Barcelona, and has created the international best-selling workshop Lizard to Wizard. He is also an esteemed international speaker and mentor, passionately encouraging best development practices with a keen focus on testing, accessibility, and security. His speaking engagements include React Alicante, React Rally, React Paris, React Summit, JNation, JSHeroes, VueJS Amsterdam, Utah JS, Techorama Belgium, JSWorld Amsterdam, CityJS Athens, CityJS Singapore, DevBCN, Talent Arena Barcelona, and Frontmania Netherlands.

Scott Batson is a Staff Engineer at Medium with 15 years of experience building products at Netflix, PBS NewsHour, and his own startup. He's been an open source contributor to React Native, React Native WebView, and Ember.js, among other libraries used by millions of developers. His writing on engineeringand web development reaches thousands of readers monthly, has been featured at Google Dev Summit, and regularly lands in prominent tech newsletters.

Engineer at heart, pixel polisher by night. Arguing with agents in daylight.

Principal Frontend Engineer at Zattoo | React Berlin Meetup Organizer | Crafting symbols for over a decade 👨‍💻✨

I always describe myself as an autodidact who is passionate about learning and exploring new things, and I'm always trying to broaden my perspective. I've created two start-ups, one of which was selected as "Turkey's Best 100th Startup" and was invested in twice by prominent investors. Now, I'm working as a Staff Software Engineer for Delivery Hero in Berlin / Germany.

Ramona is a Developer Relations Engineer at Mittwald. With a background in software engineering and quality assurance, she bridges the gap between testers and developers, fostering trust in identity-related topics. Ramona is also a Google Developer Expert in Web Technologies, a Women Techmaker, and a Cypress Ambassador.

I built cool stuff from India for the World!

Violina is a software developer with over a decade of experience in the tech industry, specialising in building scalable cross-platform applications. She is currently a developer at ClipMyHorse.TV, the world’s leading video streaming platform for equestrian sports, where she works on delivering high-quality digital experiences to a global audience. She is also the co-founder of Frontend Queens, a global community created with the belief that everyone, especially women, should have the opportunity to thrive in technology.

Andorra-based full stack engineer with 14+ years of experience.Andorra-based full stack engineer with 14+ years of experience. The products I've helped build have reached millions of people around the globe, from ride-hailing platforms to celebrity marketplaces to content discovery apps. I architect for scale, business growth, and developer experience, because I believe great products come from the place where design quality and engineering rigor meet. I thrive in fast-moving teams, and I bring a track record of shipping products that users love and businesses rely on. I'm a TDD fanatic, and I'm having a blast using AI to sharpen my thinking process so we can build well-considered, business driven experiences.

Fullstack TS dev. I like mending legacy code. I organize a few meetup groups in Montréal, including React MTL and Software Crafters.

Tech Lead • Front-End Advocate • Mentor & Educator • Tech Blogger • Published Author • 100+ IT Certifications • 30K+ Followers • Docker Captain • Cursor Ambassador • Expert in React.js, Next.js, Angular, DevOps, Web Accessibility & Security Kristiyan Velkov is a seasoned software developer and technical leader with more than 10 + years of expertise in JavaScript and open-source development. His comprehensive skill set includes: JavaScript, TypeScript, React.js, Angular, Vue.js, Next.js,DevOps,Web accessibility,Security and DevOps. A lifelong learner, Kristiyan has earned over 100 IT certifications. With experience at some of the world’s leading IT organizations, Kristiyan thrives as a technical lead, driving innovative projects and mentoring teams to achieve growth and excellence. His thought leadership has garnered a significant following: - 30,000 LinkedIn connections - 7,000 Medium subscribers - 100,000+ monthly readers - 4 IT books.

Vladyslav Bozhko is a software engineer who has been working at Superhuman for seven years. During his tenure, he has worked on multiple key Superhuman products, including Grammarly Editor, Grammarly for Mac, and the Superhuman Go browser extension. Although he is currently working as a full-stack engineer, he has spent the majority of his career working on highly interactive, large-scale production React applications serving millions of Superhuman users.

Krasimir Tsonev is a coder with over 20 years of experience in web development. Author of books on JavaScript he works at Antidote.me where he helps people reaching clinical trials. Loves React and its ecosystem.

I’m Preethi, a Senior Frontend and Design System Engineer with over five years of experience building scalable UIs, performance-optimized applications, and production-grade React design systems. Also a technical author at freeCodeCamp, CSS-Tricks, and DigitalOcean, where I simplify complex system design without losing technical depth. As a Co-Founder of the D for Design System community and Creator of the legooo React Design System, I focus on building intelligent frontend systems that work for both humans and AI.

Vinicios Neves is a senior software engineer and educator passionate about building inclusive, performant, and accessible experiences on the web. With over a decade of experience, he helps teams ship React applications that scale — in code quality and in impact. Outside of coding, he shares insights on architecture, testing, and accessibility through talks, articles, and hands-on courses. Currently based in Portugal, he believes the best code is the one everyone can use.

Builder of Coworkkit, a batteries-included AI co-worker any app can drop in and ship. Before it, he founded NearDynamics, a voice AI startup he built and exited. Along the way he has shipped product across three continents, as director of engineering at a Middle East company he helped take to IPO, an engineering manager in Germany, and a staff engineer in New York. What excites him most is the faceless app that serves one UX rendered for each user.

Senior Web Frontend Engineer at SNOW Corp. and an Apache Zeppelin committer.

Will is dedicated to crafting exceptional developer experiences, that help us increase our understanding, creativity, and flow. Throughout his career, he's shared expertise building developer tools, organized meetups, and helped cultivate thriving technical communities.

Faris Aziz is a Staff Frontend Engineer, international speaker, and product-minded engineer specializing in React, Next.js, resilient frontend architecture, and payment systems. From founding engineer to Staff Engineer and engineering leader, he has built systems used by tens of millions, co-founded the award-winning ZurichJS community, and speaks about building better software and healthier engineering cultures

I am a Senior Software Engineer specializing in frontend architecture, enterprise SaaS platforms, and developer tooling. An alumnus of IIT Guwahati, I have led frontend engineering pods building data annotation engines used by global tech leaders, architected configuration-driven UI frameworks, and founded an automation ERP platform. Currently building AI-native cloud systems at Nava, my work focuses on React, TypeScript, state management, and crafting performant component ecosystems that bridge technical rigor with exceptional user experience.

A passionate web aficionado with over a decade of experience, I've been involved in developing accessible web applications that have reached millions of people.

Asad Ullah Khalid is a Berlin-based Senior Frontend Engineer at Mercedes-Benz.io, speaker, and mentor. He builds digital products and shares practical lessons on frontend engineering, AI, and career growth in tech.